Title 24 · California Energy Code

How to calculate the minimum rated usable energy capacity of a BESS

The Energy Code gives a formula to compute the minimum usable energy (kWh) a required battery must have. Multiply your conditioned floor area by the code’s BESS capacity factor (from the table for your building type and climate zone), divide by 1,000 times the square root of the battery round‑trip efficiency, and apply the SARA PV ratio if your PV was SARA‑sized; for multifamily >3 stories the Code multiplies that result by a “k” factor (check the full code for its value). If the computed battery is less than 10 kWh or your PV is under 15% of the code PV size, the BESS may be waived. See Equations 140.10‑B/140.10‑C and 170.2‑E/170.2‑F and the exceptions in § 140.10(b) and § 170.2(h) for the exact rules .

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Last reviewed: July 6, 2026

What the code requires — plain English

All buildings required to install PV under the Energy Code must also install a battery energy storage system (BESS) sized so its rated usable energy capacity is no less than the minimum calculated by the BESS equations. Nonresidential buildings use Equation 140.10‑B (or Equation 140.10‑C when the PV size was SARA‑adjusted) and multifamily buildings >3 stories use Equation 170.2‑E (or Equation 170.2‑F when SARA was used). See the controlling code text in § 140.10(b) and § 170.2(h) for the requirement and the specific equations .

The single most important rule: size the BESS energy (kWh) with the prescribed equation for your building type (Equations 140.10‑B / 140.10‑C for nonresidential, 170.2‑E / 170.2‑F for multifamily >3 stories) and then size the power as ¼ of that energy rating per the code.

Requirements in detail

The equations and the inputs you must use are in the Code. The two forms are:

  • Nonresidential (base): Equation 140.10‑B — kWh batt = (CFA × B) / (1,000 × C[0.5])
  • Nonresidential (SARA‑adjusted): Equation 140.10‑C — same as 140.10‑B × (kW PVdc,SARA / kW PVdc)
  • Multifamily >3 stories (base): Equation 170.2‑E — kWh batt = k × ((CFA × B) / (1000 × C[0.5]))
  • Multifamily >3 stories (SARA‑adjusted): Equation 170.2‑F — same as 170.2‑E × (kW PVdc,SARA / kW PVdc)

Key terms (first appearance bolded):

  • CFA — conditioned floor area subject to the PV requirement (ft2) (used in Eqn 140.10‑B/C and 170.2‑E/F) .
  • B — BESS capacity factor in Wh/ft2; select the B value for the building type and climate zone from Table 140.10‑B (nonresidential) or Table 170.2‑V (multifamily) as applicable .
  • C — rated single charge‑discharge AC‑to‑AC (round‑trip) efficiency of the BESS (use the manufacturer rating) . Note the code writes C [0.5] in the denominator (see equations) — that notation appears in the equations text .
  • kW PVdc and kW PVdc,SARA — the minimum rated PV capacity calculated by the PV equations (Equation 140.10‑A or 170.2‑D) and, when applicable, the PV capacity after the SARA adjustment; used by the “SARA‑adjusted” equations (140.10‑C, 170.2‑F) .
  • k — a multiplier that appears in Equation 170.2‑E / F (multifamily). The exact definition or numeric values for k do not appear in the snippets available to me in the retrieved files; check the full section text or the official code document for the defined value of k before final calculation (see note below) .

Decision‑relevant summary table

Decision input / threshold What it is Where Code points you
CFA (conditioned floor area) Area in ft2 used in the PV/BESS equations § 140.10(a), § 170.2(g) and equations (140.10‑B/C, 170.2‑E/F)
B (Wh/ft2) BESS capacity factor by building type & CZ Table 140.10‑B (nonresidential) or Table 170.2‑V (multifamily)
C (round‑trip eff.) Manufacturer rated AC‑to‑AC round‑trip efficiency (use in equation) Equations 140.10‑B/C and 170.2‑E/F (notation C [0.5])
SARA adjustment factor Ratio (kW PVdc,SARA / kW PVdc) when SARA was used to size PV Equation 140.10‑C and 170.2‑F; PV SARA rules in the PV sections (e.g., SARA definitions)
k (multifamily multiplier) Multiplier in Eqn 170.2‑E/F — definition not present in retrieved snippets Equation text shows k but definition not found in the retrieved files — see § 170.2 and full code text
Minimum exceptions No BESS required if PV < 15% of required PV capacity; or if computed BESS < 10 kWh; other tenant/single‑tenant rules Exceptions to § 140.10(b) and § 170.2(h)

Notes on the equation notation

  • The equations in the code use the expression C [0.5] in the denominator (e.g., 1,000 × C [0.5]). The code text shows that exact bracketed notation in the published equations; common mathematical reading of that expression is C^0.5 (the square root of C). If you need an official interpretation for submittal, verify with the full code commentary or the Enforcement Agency (I could not find an explicit textual explanation of the bracket notation in the retrieved snippets) .

Sizing power capacity

  • Once you have the minimum kWh batt, the code requires the BESS rated power to be not less than the minimum determined by the power equation: kW batt = kWh batt / 4 (Equation 140.10‑D and 170.2‑G) .

Exceptions & special cases

  • No BESS required if installed PV < 15% of the capacity determined by the PV equation (applies to both nonresidential and multifamily BESS rules) — see Exception 1 to § 140.10(b) and Exception 1 to § 170.2(h) .
  • No BESS required if computed kWh batt < 10 kWh. Both sections include this 10 kWh threshold as an exception (i.e., very small required BESS are waived) .
  • Mixed occupancy — apply the equation to each listed building type and sum the BESS energy capacities to get the building total (expressly required by the Code) .
  • Multitenant / tenant spaces — for nonresidential multitenant buildings the BESS energy may be based on tenant spaces > 5,000 ft2; small single‑tenant buildings < 5,000 ft2 may have no BESS required (see the exceptions) .
  • SARA — When PV capacity was determined using rooftop SARA, the BESS minimum is scaled by the PV SARA ratio via Equations 140.10‑C or 170.2‑F (use the SARA PVdc values in the numerator/denominator) .

Common mistakes

  • Using the PV system nameplate (or an assumed PV value) instead of the kW PVdc that the code’s PV equation (or SARA) produces — the SARA adjustment specifically uses the ratio kW PVdc,SARA / kW PVdc, so use the code‑calculated PV numbers not installer quotes unless those were calculated to code formulas .
  • Forgetting to get B from the correct Table for the building type and climate zone (Table 140.10‑B vs Table 170.2‑V) .
  • Ignoring the C [0.5] notation and dividing by C rather than by the square root of C (interpretation of the notation should be checked with the full code commentary) .
  • Failing to apply mixed‑occupancy summation rules (must size each listed building type separately and sum) .
  • Not checking the exceptions (15% PV threshold, 10 kWh minimum) which can remove the BESS requirement entirely for small projects .

Worked example — multifamily >3 stories (concrete numbers)

This example walks through the multifamily equation (Equation 170.2‑E). The calculation shows the steps and highlights where you must pull a value from a table or the equipment manufacturer.

Given / assumptions:

  • Building type: Multifamily > 3 stories in Climate Zone 4. B (from Table 170.2‑V) for that row and CZ = 2.21 Wh/ft2 (see Table 170.2‑V) .
  • CFA = 30,000 ft2 (conditioned floor area that is subject to the PV requirement).
  • C (round‑trip efficiency) = 0.90 (assumed manufacturer rated AC‑to‑AC round‑trip efficiency; you must use the actual rating your BESS vendor provides).
  • For this worked example we will leave k symbolic because the definition/value for k is not present in the retrieved excerpts — confirm k in the full code text or local compliance guidance before final sizing .

Step 1 — compute the bracketed numerator:

  • CFA × B = 30,000 ft2 × 2.21 Wh/ft2 = 66,300 Wh

Step 2 — denominator 1000 × C[0.5]:

  • If C = 0.90, then C[0.5] (C^0.5, the square root of C) ≈ 0.948683
  • 1,000 × C[0.5] ≈ 948.683

Step 3 — base kWh (before k multiplier):

  • (CFA × B) / (1000 × C[0.5]) = 66,300 / 948.683 ≈ 69.9 kWh

Step 4 — apply the multifamily k multiplier:

  • Code writes kWh batt = k × (…); the final kWh requirement = k × 69.9 kWh. The exact numeric final value requires the value of k as defined in the code or local rule (definition not found in retrieved snippets) .

Step 5 — size the minimum rated power:

  • Per Equation 170.2‑G, kW batt = kWh batt / 4 = (k × 69.9) / 4 ≈ k × 17.5 kW (rounded).

If k = 1 (hypothetical), the BESS minimum would be ≈ 69.9 kWh usable energy and 17.5 kW of rated power. Confirm k and apply any SARA adjustment factor if the PV was SARA‑sized (Equation 170.2‑F) — multiply the base kWh by (kW PVdc,SARA / kW PVdc) using the PV results from Equation 170.2‑D / the SARA PV calculation .

Related provisions (useful cross‑references)

  • § 140.10(a) — PV sizing and applicability for nonresidential/hotel/motel (you use the PV capacity to compute PVdc) .
  • § 140.10(b) — BESS requirements, Equations 140.10‑B, 140.10‑C, 140.10‑D, and exceptions (nonresidential) .
  • Equation 140.10‑B / Equation 140.10‑C — Minimum rated usable energy capacity (nonresidential) .
  • Equation 140.10‑D — BESS minimum rated power capacity (kW batt = kWh batt / 4) .
  • § 170.2(g) / Equation 170.2‑D — PV requirements and PVdc for multifamily >3 stories (PV input used in 170.2‑F) .
  • § 170.2(h) — BESS requirements (multifamily >3 stories) and Equations 170.2‑E / 170.2‑F / 170.2‑G; Table 170.2‑V provides the B values .
  • Joint Appendix JA12 — BESS qualification requirements referenced by both Code sections (the Code requires the BESS meet JA12 qualification) .

If you need, I can:

  • Pull the exact B value for your building type + climate zone from the appropriate Table if you give the type and CZ, or
  • Look up the official Code definition / numeric value of k for Equation 170.2‑E / F (I could not find k's definition in the retrieved snippets; I will retrieve the full page/section if you want me to look for it in the uploaded files).

Code references

Grounded in the retrieved California Energy Code — click a citation to read the verbatim passage:

  • § 140.10 High relevance — show source text

    (b) Battery energy storage system (BESS) requirements. All buildings that are required by Section 140.10(a) to have a PV system shall also have a BESS meeting the minimum qualification requirements of Reference Joint Appendix JA12. The rated energy capacity shall be not less than the Minimum Rated Useable Energy Capacity determined using Equation 140.10-B or 140.10-C if SARA was used to determine the PV capacity in Section 140.10(a). The rated power capacity shall be not less than the Minimum Power Capacity determined using Equation 140.10-D. In mixed occupancy buildings, the total battery system capacity for the building shall be determined by applying the Minimum Rated Usable Energy Capacity to each of the listed building types and summing the capacities determined for each.

    EQUATION 140.10-B—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY kWh batt = [(CFA × B)/(1,000 × C [0.5] )]

    EQUATION 140.10-C—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY, SARA-ADJUSTED kWh batt = [(CFA × B)/(1,000 × C [0.5] )] x (kW PVdc,SARA /kW PVdc )

    where:

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    CFA = Conditioned floor area that is subject to the PV system requirements of Section 140.10(a) in square feet.

    kW PVdc = Minimum Rated PV System Capacity in kW from Equation 140.10-A. kW PVdc, SARA = Minimum Rated PV System Capacity in kW from the SARA calculation. B = BESS Capacity Factor in Wh/square foot as specified in Table 140.10-B for the building type. C = Rated single charge-discharge cycle AC to AC (round-trip) efficiency of the BESS.

    EQUATION 140.10-D—BESS MINIMUM RATED POWER CAPACITY

    kW batt = kW batt /4

    where:

    kW batt = Minimum Rated Power Capacity of the BESS in kWdc. kW PVdc = Minimum Rated Useable Energy Capacity of the BESS in kWh. Exception 1 to Section 140.10(b): No BESS is required if the installed PV system capacity is less than 15 percent of the capacity determined by Equation 140.10-A.

    Exception 2 to Section 140.10(b): No BESS is required if the rated usable energy capacity determined by Equation 140.10-B or Equation 140.10-C is less than 10 kWh.

    Exception 3 to Section 140.10(b): For multitenant buildings, the energy capacity of the BESS shall be based on the tenant spaces with more than 5,000 square feet of conditioned floor area. For single-tenant buildings with less than 5,000 square feet of conditioned floor area, no BESS is required.

    146 2025 CALIFORNIA ENERGY CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

    COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

    |TABLE 140.

  • § 170.2 High relevance — show source text

    268 2025 CALIFORNIA ENERGY CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

    where:

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    kW PVdc = Minimum Rated PV System Capacity in kW from Equation 170.2D. kW PVdc, SARA = Minimum Rated PV System Capacity in kW from the SARA calculation. CFA = Conditioned floor area that is subject to the PV system requirements of Section 170.2(g) in square feet.

    B = BESS Capacity Factor in Wh/square foot as specified in Table 170.2-V for the building type.

    C = Rated single charge-discharge cycle AC to AC (round-trip) efficiency of the BESS.

    EQUATION 170.2-G—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED POWER CAPACITY

    kW batt = kW batt /4

    where:

    kW batt = Minimum Rated Power Capacity of the BESS in kW dc .

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    Exception 1 to Section 170.2(h): No BESS is required if the installed PV system capacity is less than 15 percent of the capacity determined by Equation 170.2-D.

    Exception 2 to Section 170.2(h): No BESS is required in buildings with BESS requirements with less than 10 kWh minimum rated usable energy capacity.

    TABLE 170.2-V—BESS CAPACITY FACTORS (Wh/ft2 of conditioned floor area) Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col12 Col13 Col14 Col15 Col16 Col17
    BUILDING TYPE CZ 1 CZ 2 CZ 3 CZ 4 CZ 5 CZ 6 CZ 7 CZ 8 CZ 9 CZ 10 CZ 11 CZ 12 CZ 13 CZ 14 CZ 15 CZ 16
    Event & Exhibit 1.82 1.95 1.74 2.12 1.91 2.13 2.24 2.30 2.36 2.47 2.62 2.16 2.64 2.68 3.22 1.89
    Library 0.37 7.17 5.97 6.75 5.64 6.08 6.19 7.13 7.18 7.56 7.17 6.93 6.88 6.81 7.93 6.40
    Hotel/Motel 0.86 0.84 0.77 0.92 0.81 0.89 0.90 1.01 1.00 1.11 1.14 0.96 1.18 1.18 1.49 0.85
    Office, Financial Institution,
  • § 140.10 High relevance — show source text

    Exception 1 to Section 140.10(a): No PV system is required where the total of all available SARA is less than 3 percent of the conditioned floor area.

    Exception 2 to Section 140.10(a): No PV system is required where the required PV system capacity is less than 4 kW dc .

    Exception 3 to Section 140.10(a): No PV system is required if the SARA contains less than 80 contiguous square feet.

    Exception 4 to Section 140.10(a): Buildings with enforcement-authority-approved roof designs, where the enforcement authority determines it is not possible for the PV system, including panels, modules, components, supports and attachments to the roof structure, to meet ASCE 7-16, Chapter 7, Snow Loads.

    Exception 5 to Section 140.10(a): For nonresidential and hotel/motel multitenant buildings, the PV capacity determined by Equation 140.10-A shall be calculated without including tenant spaces meeting all of the following: i. The tenant space is less than or equal to 2,000 square feet of conditioned space; ii. The tenant space is served by an HVAC system that does not serve other tenant spaces in the building; and iii. The tenant space has an individual utility meter to track electricity consumption that does not include the electricity consumption of other tenant spaces in the building.

    This exception does not apply where the Commission has approved a community solar program for showing compliance as specified in Title 24, Part 1, Section 10-115, or where a load-serving entity provides a program where PV generation is compensated through virtual energy bill credits for occupants of nonresidential and hotel/motel tenant spaces to receive energy bill benefits from netting of energy generation and consumption.

    (b) Battery energy storage system (BESS) requirements. All buildings that are required by Section 140.10(a) to have a PV system shall also have a BESS meeting the minimum qualification requirements of Reference Joint Appendix JA12. The rated energy capacity shall be not less than the Minimum Rated Useable Energy Capacity determined using Equation 140.10-B or 140.10-C if SARA was used to determine the PV capacity in Section 140.10(a). The rated power capacity shall be not less than the Minimum Power Capacity determined using Equation 140.10-D. In mixed occupancy buildings, the total battery system capacity for the building shall be determined by applying the Minimum Rated Usable Energy Capacity to each of the listed building types and summing the capacities determined for each.

    EQUATION 140.10-B—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY kWh batt = [(CFA × B)/(1,000 × C [0.5] )]

    EQUATION 140.10-C—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY, SARA-ADJUSTED kWh batt = [(CFA × B)/(1,000 × C [0.5] )] x (kW PVdc,SARA /kW PVdc )

    where:

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    CFA = Conditioned floor area that is subject to the PV system requirements of Section 140.10(a) in square feet.

  • § 1.27 High relevance — show source text

    63|1.27|1.63|1.27|1.63|1.63|1.63|1.63|1.63|1.63|1.63|1.63|1.63|2.46|1.27| |Warehouse|0.39|0.44|0.39|0.44|0.39|0.44|0.44|0.44|0.44|0.44|0.44|0.44|0.44|0.44|0.58|0.39| |Religious Worship|4.25|4.65|3.49|4.52|3.72|4.29|4.64|5.89|5.30|5.67|5.89|4.99|5.78|4.63|7.57|3.90| |Sports & Recreation|2.47|1.97|1.54|2.03|1.60|1.84|1.98|2.63|2.47|2.60|2.75|2.20|2.72|2.15|4.03|1.81| |Multifamily > 3 stories|1.82|2.21|1.82|2.21|1.82|2.21|2.21|2.21|2.21|2.21|2.21|2.21|2.21|2.21|2.77|1.82|

    (h) Battery energy storage system (BESS) requirements—more than three habitable stories. All buildings that are required by Section 170.2(g) to have a PV system shall also have a BESS meeting the minimum qualification requirements of Reference Joint Appendix JA12. The rated energy capacity shall be not less than the Minimum Rated Useable Energy Capacity determined by Equation 170.2-E, or by Equation 170.2-F if SARA was used to determine the PV capacity in Section 170.2-D, and the rated power capacity shall be not less than the Minimum Power Capacity determined by Equation 170.2-G. In mixed occupancy buildings, the total battery system capacity for the building shall be determined by applying the Minimum Rated Usable Energy Capacity to each of the listed building types and summing the capacities determined for each.

    EQUATION 170.2-E—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY kWh batt = k((CFA × B)/(1000 × C [0.5] ))

    — EQUATION 170.2-F BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY, SARA-ADJUSTED kWh batt = k((CFA × B)/(1000 × C [0.5] )) × (kWP Vdc,SARA /kWP Vdc )

    268 2025 CALIFORNIA ENERGY CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

    where:

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    kW PVdc = Minimum Rated PV System Capacity in kW from Equation 170.2D. kW PVdc, SARA = Minimum Rated PV System Capacity in kW from the SARA calculation. CFA = Conditioned floor area that is subject to the PV system requirements of Section 170.2(g) in square feet.

  • § 170.2 High relevance — show source text

    The rated energy capacity shall be not less than the Minimum Rated Useable Energy Capacity determined by Equation 170.2-E, or by Equation 170.2-F if SARA was used to determine the PV capacity in Section 170.2-D, and the rated power capacity shall be not less than the Minimum Power Capacity determined by Equation 170.2-G. In mixed occupancy buildings, the total battery system capacity for the building shall be determined by applying the Minimum Rated Usable Energy Capacity to each of the listed building types and summing the capacities determined for each.

    EQUATION 170.2-E—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY kWh batt = k((CFA × B)/(1000 × C [0.5] ))

    — EQUATION 170.2-F BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED USABLE ENERGY CAPACITY, SARA-ADJUSTED kWh batt = k((CFA × B)/(1000 × C [0.5] )) × (kWP Vdc,SARA /kWP Vdc )

    268 2025 CALIFORNIA ENERGY CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

    where:

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    kW PVdc = Minimum Rated PV System Capacity in kW from Equation 170.2D. kW PVdc, SARA = Minimum Rated PV System Capacity in kW from the SARA calculation. CFA = Conditioned floor area that is subject to the PV system requirements of Section 170.2(g) in square feet.

    B = BESS Capacity Factor in Wh/square foot as specified in Table 170.2-V for the building type.

    C = Rated single charge-discharge cycle AC to AC (round-trip) efficiency of the BESS.

    EQUATION 170.2-G—BATTERY ENERGY STORAGE SYSTEM MINIMUM RATED POWER CAPACITY

    kW batt = kW batt /4

    where:

    kW batt = Minimum Rated Power Capacity of the BESS in kW dc .

    kWh batt = Minimum Rated Usable Energy Capacity of the BESS in kWh.

    Exception 1 to Section 170.2(h): No BESS is required if the installed PV system capacity is less than 15 percent of the capacity determined by Equation 170.2-D.

    Exception 2 to Section 170.2(h): No BESS is required in buildings with BESS requirements with less than 10 kWh minimum rated usable energy capacity.

    |TABLE 170.

  • § 140.10 High relevance — show source text

    EQUATION 140.10-D—BESS MINIMUM RATED POWER CAPACITY

    kW batt = kW batt /4

    where:

    kW batt = Minimum Rated Power Capacity of the BESS in kWdc. kW PVdc = Minimum Rated Useable Energy Capacity of the BESS in kWh. Exception 1 to Section 140.10(b): No BESS is required if the installed PV system capacity is less than 15 percent of the capacity determined by Equation 140.10-A.

    Exception 2 to Section 140.10(b): No BESS is required if the rated usable energy capacity determined by Equation 140.10-B or Equation 140.10-C is less than 10 kWh.

    Exception 3 to Section 140.10(b): For multitenant buildings, the energy capacity of the BESS shall be based on the tenant spaces with more than 5,000 square feet of conditioned floor area. For single-tenant buildings with less than 5,000 square feet of conditioned floor area, no BESS is required.

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    COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

    TABLE 140.10-A—PV CAPACITY FACTORS (W/ft2 of conditioned floor area) Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col12 Col13 Col14 Col15 Col16 Col17
    BUILDING TYPE CZ 1 CZ 2 CZ 3 CZ 4 CZ 5 CZ 6 CZ 7 CZ 8 CZ 9 CZ 10 CZ 11 CZ 12 CZ 13 ** CZ 14** ** CZ 15** ** CZ 16**
    Events & Exhibits 3.48 4.28 3.66 4.32 3.77 4.05 4.28 4.83 4.63 4.80 5.04 4.44 4.95 4.36 5.48 3.38
    Library 0.39 3.23 2.59 3.25 2.48 2.74 3.04 3.49 3.32 3.69 3.79 3.32 3.79 3.37 4.49 2.84
    Hotel/Motel 1.69 1.90 1.66 1.97 1.69 1.87 1.94 2.22 2.09 2.20 2.30 2.05 2.30 2.02 2.72 1.73
    Office, Financial
    Institution, Unleased
    Tenant Space, Medical
    Office Building/Clinic    		 2.59 3.13 2.59 3.13 2.59 3.13 3.13 3.
  • § 1.000 Medium relevance — show source text

    d| |Absorption double effect,
    indirect-fired|All capacities|≥ 1.000 COP
    ≥ 1.050 IPLV|N.A.d|N.A.d| |Absorption double effect,
    direct-fired|All capacities|≥ 1.000 COP
    ≥ 1.000 IPLV|N.A.d|N.A.d| |Water cooled gas engine
    driven chiller|All capacities|≥ 1.2 COP
    ≥ 2.0 IPLV|N.A.d|ANSI Z21.40.4| |a. No requirements for:
    • Centrifugal chillers with design leaving evaporator temperature < 36°F; or
    • Positive displacement chillers with design leaving fluid temperature ≤ 32°F; or
    • Absorption chillers with design leaving fluid temperature < 40°F.
    b. Must meet the minimum requirements of Path A or Path B. However, both the full load (COP) and IPLV must be met to fulfill the requirements of the applicable path.
    c. See Section 100.1 for definitions.
    d. N.A. means not applicable.|a. No requirements for:
    • Centrifugal chillers with design leaving evaporator temperature < 36°F; or
    • Positive displacement chillers with design leaving fluid temperature ≤ 32°F; or
    • Absorption chillers with design leaving fluid temperature < 40°F.
    b. Must meet the minimum requirements of Path A or Path B. However, both the full load (COP) and IPLV must be met to fulfill the requirements of the applicable path.
    c. See Section 100.1 for definitions.
    d. N.A. means not applicable.|a. No requirements for:
    • Centrifugal chillers with design leaving evaporator temperature < 36°F; or
    • Positive displacement chillers with design leaving fluid temperature ≤ 32°F; or
    • Absorption chillers with design leaving fluid temperature < 40°F.
    b. Must meet the minimum requirements of Path A or Path B. However, both the full load (COP) and IPLV must be met to fulfill the requirements of the applicable path.
    c. See Section 100.1 for definitions.
    d. N.A. means not applicable.|a. No requirements for:
    • Centrifugal chillers with design leaving evaporator temperature < 36°F; or
    • Positive displacement chillers with design leaving fluid temperature ≤ 32°F; or
    • Absorption chillers with design leaving fluid temperature < 40°F.
    b. Must meet the minimum requirements of Path A or Path B. However, both the full load (COP) and IPLV must be met to fulfill the requirements of the applicable path.
    c. See Section 100.1 for definitions.
    d. N.A. means not applicable.|a. No requirements for:
    • Centrifugal chillers with design leaving evaporator temperature < 36°F; or
    • Positive displacement chillers with design leaving fluid temperature ≤ 32°F; or
    • Absorption chillers with design leaving fluid temperature < 40°F.
    b. Must meet the minimum requirements of Path A or Path B. However, both the full load (COP) and IPLV must be met to fulfill the requirements of the applicable path.
    c. See Section 100.1 for definitions.
    d. N.A. means not applicable.|

    44 2025 CALIFORNIA ENERGY CODE

  • § 4.44 Medium relevance — show source text

    04|4.44|4.95|4.36|5.48|3.38| |Library|0.39|3.23|2.59|3.25|2.48|2.74|3.04|3.49|3.32|3.69|3.79|3.32|3.79|3.37|4.49|2.84| |Hotel/Motel|1.69|1.90|1.66|1.97|1.69|1.87|1.94|2.22|2.09|2.20|2.30|2.05|2.30|2.02|2.72|1.73| |Office, Financial Institution,
    Unleased Tenant Space,
    Medical Office Building/Clinic|2.59|3.13|2.59|3.13|2.59|3.13|3.13|3.13|3.13|3.13|3.13|3.13|3.13|3.13|3.80|2.59| |Restaurant|8.55|9.32|8.16|9.65|8.21|8.73|9.11|10.18|9.75|10.28|10.85|9.73|10.69|9.73|12.25|8.47| |Retail, Grocery|3.14|3.49|3.01|3.61|3.05|3.27|3.45|3.83|3.65|3.81|4.09|3.64|3.99|3.71|4.60|3.21| |School|1.27|1.63|1.27|1.63|1.27|1.63|1.63|1.63|1.63|1.63|1.63|1.63|1.63|1.63|2.46|1.27| |Warehouse|0.39|0.44|0.39|0.44|0.39|0.44|0.44|0.44|0.44|0.44|0.44|0.44|0.44|0.44|0.58|0.39| |Religious Worship|4.25|4.65|3.49|4.52|3.72|4.29|4.64|5.89|5.30|5.67|5.89|4.99|5.78|4.63|7.57|3.90| |Sports & Recreation|2.47|1.97|1.54|2.03|1.60|1.84|1.98|2.63|2.47|2.60|2.75|2.20|2.72|2.15|4.03|1.81| |Multifamily > 3 stories|1.82|2.21|1.82|2.21|1.82|2.21|2.21|2.21|2.21|2.21|2.21|2.21|2.21|2.21|2.77|1.82|

    (h) Battery energy storage system (BESS) requirements—more than three habitable stories. All buildings that are required by Section 170.2(g) to have a PV system shall also have a BESS meeting the minimum qualification requirements of Reference Joint Appendix JA12.

  • § 1206.13 Medium relevance — show source text

    1206.13 Group R-3 and R-4 fuel cell vehicle energy storage system use. The temporary use of the dwelling unit owner or occupant’s fuel cell-powered electric vehicle to power a Group R-3 or R-4 dwelling while parked in an attached or detached garage or outside shall comply with the vehicle manufacturer’s instructions and the California Electrical Code .

    SECTION 1207—ELECTRICAL ENERGY STORAGE SYSTEMS (ESS)

    1207.1 General. The provisions in this section are applicable to stationary and mobile electrical energy storage systems (ESS).

    Exception: ESS in Group R-3 and R-4 occupancies shall only be required to comply with Section 1207.11 except where Section 1207.11.4 requires compliance with Sections 1207.1 through 1207.9.

    1207.1.1 Utilities and industrial applications. This section shall not apply to capacitors and capacitor equipment for electric utilities and industrial facilities used in applications such as flexible AC transmission (FACTS) devices, filter capacitor banks, power factor correction, and standalone capacitor banks for voltage correction and stabilization. (Material based on NFPA 855 2023 Ed.)

    1207.1.2 Mobile ESS. Mobile ESS deployed at an electric utility substation or generation facility for 90 days or less shall not add to the threshold values in Table 1207.1.3 for the stationary ESS installation if both of the following conditions apply:

    1. The mobile ESS complies with Section 1207.10.
    2. The mobile ESS is being used only during periods in which the facility’s stationary ESS is being tested, repaired, retrofitted or replaced. (Material based on NFPA 855 2023 Ed.)

    1207.1.3 Scope. ESS having capacities exceeding the values shown in Table 1207.1.3 shall comply with this section. (Material based on NFPA 855 2023 Ed.)

    TABLE 1207.1.3—ENERGY STORAGE SYSTEM (ESS) THRESHOLD QUANTITIES Col2
    TECHNOLOGY ENERGY CAPACITYa
    Capacitor ESS 3 kWh
    Flow batteriesb 20 kWh
    Lead-acid batteries, all types 70 kWhc
    Lithium-ion batteries 20 kWh
    Nickel-cadmium (Ni-Cd), nickel metal hydride (Ni-MH) and nickel zinc (Ni-Zn) batteries 70 kWh
    Nonelectrochemical ESSd 70 kWh
    Other battery technologies 10 kWh
    Other electrochemical ESS technologies 3 kWh
    Sodium nickel chloride batteries 70 kWh
    Zinc manganese dioxide batteries (Zn-MnO2) 70 kWh
    For SI: 1 kilowatt hour = 3.6 megajoules.
    a. Energy capacity is the total energy capable of being stored (nameplate rating), not the usable energy rating. For units rated in amp-hours, kWh shall equal rated voltage
    times amp-hour rating divided by 1,000.
    b. Shall include vanadium, zinc-bromine, polysulfide-bromide and other flowing electrolyte-type technologies.
    c. Fifty gallons of lead-acid battery electrolyte shall be considered equivalent to 70 kWh.
    d. Covers nonelectrochemical technologies such as flywheel and thermal ESS.    		 For SI: 1 kilowatt hour = 3.6 megajoules.
    a. Energy capacity is the total energy capable of being stored (nameplate rating), not the usable energy rating.
  • § 6.4 Medium relevance — show source text

    6.4_|||X|||||||||||||||||||||| |907.2.6.5|||X|||||||||||||||||||||| |907.2.9|||X|||||||||||||||||||||| |907.2.9.1|||X|||||||||||||||||||||| |907.2.9.3|||X|||||||||||||||||||||| |907.2.9.4|||X|||||||||||||||||||||| |907.2.9.4.1|||X|||||||||||||||||||||| |907.2.10|||X|||||||||||||||||||||| |907.2.11|||X|||||||||||||||||||||| |907.2.11.1|||X|||||||||||||||||||||| |907.2.11.2|||X|||||||||||||||||||||| |907.2.11.2.1 – 907.2.11.2.6|||X|||||||||||||||||||||| |907.2.11.3|||X|||||||||||||||||||||| |907.2.11.4|||X|||||||||||||||||||||| |907.2.11.6|||X|||||||||||||||||||||| |907.2.11.8|||X|||||||||||||||||||||| |907.2.11.9|||X|||||||||||||||||||||| |907.2.12|||X|||||||||||||||||||||| |907.2.13|||X|||||||||||||||||||||| |907.2.13.1|||X|||||||||||||||||||||| |907.2.13.1.2|||X|||||||||||||||||||||| |907.2.24 with subsections|||X|||||||||||||||||||||| |907.2.25 with subsections|||X|||||||||||||||||||||| |907.2.26 with subsections|||X|||||||||||||||||||||| |907.2.27|||X||||||||||||||||||||||

    2025 CALIFORNIA BUILDING CODE 9-3

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE

    CHAPTER 9 – FIRE PROTECTION AND LIFE SAFETY SYSTEMS—continued

  • § 150.0 Medium relevance — show source text

    (s) Battery Energy Storage Systems (BESS) ready. All single-family residences that include one or two dwelling units, which a load-serving entity provides with electrical service for the dwelling unit that is greater than 125 amps, shall meet the following.

    1. At least one of the following shall be provided: A. BESS-ready interconnection equipment with a minimum backed-up capacity of 60 amps and a minimum of four BESS-supplied branch circuits specified in Section 150.0(s)2, or B. A dedicated raceway from the main service to a panelboard (subpanel) that supplies the branch circuits in Section 150.0(s)2. All branch circuits are permitted to be supplied by the main service panel prior to the installation of a BESS. The trade size of the raceway shall be not less than 1 inch. The panelboard that supplies the branch circuits (subpanel) must be labeled “Subpanel shall include all backed-up load circuits.”
    2. A minimum of four branch circuits shall be identified and have their source of supply collocated at a single panelboard suitable to be supplied by the BESS. At least one circuit shall supply the refrigerator, one lighting circuit shall be located near the primary egress and at least one circuit shall supply a sleeping room receptacle outlet.
    3. The main panelboard shall have a minimum busbar rating of 225 amps.
    4. Sufficient space shall be reserved to allow future installation of a system isolation equipment/transfer switch within 3 feet of the main panelboard. Raceways shall be installed between the panelboard and the system isolation equipment/transfer switch location to allow the connection of backup power source.

    Exception to Section 150.0(s): Buildings which have a BESS installed.

    (t) Heat pump space heater ready. Systems using gas or propane furnace to serve individual dwelling units shall include the following:

    1. A dedicated 240 volt branch circuit wiring shall be installed within 3 feet from the furnace and accessible to the furnace with no obstructions. The branch circuit conductors shall be rated at 30 amps minimum. The blank cover shall be identified as “240V ready.” All electrical components shall be installed in accordance with the California Electrical Code .
    2. The main electrical service panel shall have a reserved space to allow for the installation of a double pole circuit breaker for a future heat pump space heater installation. The reserved space shall be permanently marked as “For Future 240V use.”

    (u) Electric cooktop ready. Systems using gas or propane cooktop to serve individual dwelling units shall include the following:

    1. A dedicated 240 volt branch circuit wiring shall be installed within 3 feet from the cooktop and accessible to the cooktop with no obstructions. The branch circuit conductors shall be rated at 50 amps minimum. The blank cover shall be identified as “240V ready.” All electrical components shall be installed in accordance with the California Electrical Code .
    2. The main electrical service panel shall have a reserved space to allow for the installation of a double pole circuit breaker for a future electric cooktop installation. The reserved space shall be permanently marked as “For Future 240V use.”

    (v) Electric clothes dryer ready. Clothes dryer locations with gas or propane plumbing to serve individual dwelling units shall include the following:

    1. A dedicated 240 volt branch circuit wiring shall be installed within 3 feet from the clothes dryer location and accessible to the clothes dryer location with no obstructions. The branch circuit conductors shall be rated at 30 amps minimum. The blank cover shall be identified as “240V ready.” All electrical components shall be installed in accordance with the California Electrical Code .
  • § 503.1.4. Medium relevance — show source text

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

    and obstructions that are part of the building design and elevation features, may be considered for the annual solar access calculations.

    B. Occupied roofs as specified by CBC Section 503.1.4. C. Roof area that is otherwise not available due to compliance with: i. Other state building code requirements, or ii. Local building code requirements if the local building code requirements are confirmed by the Executive Director.

    EQUATION 170.2-D—PHOTOVOLTAIC DIRECT CURRENT CAPACITY

    kW PVdc = (CFA × A)/1000

    where:

    kW PVdc = Minimum rated PV system capacity in kW.

    CFA = Conditioned floor area in square feet.

    A = PV capacity factor in W/square foot as specified in Table 170.2-U for the building type.

    Exception 1 to Section 170.2(g): No PV system is required where the total of all available SARA is less than 3 percent of the conditioned floor area.

    Exception 2 to Section 170.2(g): No PV system is required where the required PV system capacity is less than 4 kW dc .

    Exception 3 to Section 170.2(g): No PV system is required if the SARA contains less than 80 contiguous square feet.

    Exception 4 to Section 170.2(g): Buildings with enforcement-authority-approved roof designs, where the enforcement authority determines it is not possible for the PV system, including panels, modules, components, supports and attachments to the roof structure, to meet ASCE 7-16, Chapter 7, Snow Loads.

    Exception 5 to Section 170.2(g): Multifamily buildings with more than three habitable stories in areas where a load-serving entity does not provide a program where PV generation is compensated through virtual energy bill credits. This exception does not apply where the Commission has approved a community solar program for showing compliance as specified in Title 24, Part 1, Section 10-115, or where a load-serving entity provides a program where PV generation is compensated through virtual energy bill credits for occupants of nonresidential and hotel/motel tenant spaces to receive energy bill benefits from netting of energy generation and consumption.

    TABLE 170.2-U – PV CAPACITY FACTORS (W/ft2 of conditioned floor area) Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col12 Col13 Col14 Col15 Col16 Col17
    BUILDING TYPE CZ 1 CZ 2 CZ 3 CZ 4 CZ 5 CZ 6 CZ 7 CZ 8 CZ 9 CZ 10 CZ 11 CZ 12 CZ 13 CZ 14 CZ 15 CZ 16
    Event & Exhibit 3.48 4.28 3.66 4.32 3.77 4.05 4.28 4.83 4.63 4.
  • § 10-105 Medium relevance — show source text

    10-105, 110.6(a)5, 110.6(a)5, 110.6(a)6, 110.9(c), 110.9(d), 110.10(a), 120.5(a), 120.6(a)7, 120.6(b)6, 120.6(c)8, 120.6(e)6, 120.6(f)5, 120.6(g)2, 120.6(i)4, 130.1(a), 130.1(c)1, 130.4(a), 140.0(c), 140.3(a)8, 140.3(d)2, 140.9(b)3, 140.9(c)3-4, 160.2(a), 160.3(d)1, 160.3(d)2, 160.5(b)4, 160.5(e)1 Entire Building 110.10(b)1B, 120.1(d)2, Equation 140.3-B, 140.3(a)9C, 140.4(g), 140.6(b)3A, 140.6(c)1, 141.0(b)2A, 141.0(d), 150.2(b), 160.2(c)5B, Equation 170.2-B, 170.2(c)4E, 180.2(b)1C, 180.4 Envelope 110.7, 120.0, 120.2(a)1, 120.6(h)4, 120.8(b)5, 120.8(c)5, 140.3(a), 140.3(d)2H, 140.4(b)5, 141.0(a)1, 141.0(a)2, 141.0(b)2, 141.0(b)3, 141.1(c)2, 150.0(m)1B, 150.0(o)1C, 160.1, 160.2(b)2, 160.3(a)2A, 160.3(b)5A, 170.2(a), 170.2(c)2E, 180.1(a)1, 180.2(b)1 Envelope Component Package – Multifamily Standard Building Design Table 170.2-A Envelope Component Requirements 140.3(A), 170.2(A) Envelope Leakage 150.0(o), 160.2(b)2A Equation 140.3-A 140.3(a)5 140.3-B 140.3(a)5 140.3-D 140.3(d)2, 140.3(d)3, 170.2(a)3A 140.4-A 140.4(c)1 150.1-C 150.1(c)14 Equipment 170.2(c)3 Expectations 120.8(b) Loads 140.4(b)9, 170.2(c)2I Maintenance 110.8(g)2, 120.3(b), 120.4(f), 150.0(m)9, 160.3(b)5I, 160.3(c)1A, 160.3(c)2G, 160.4(f)1 Selection 140.4(a), 170.2(c)1 Sizing 140.4(b), 150.0(h), 160.3(b)1, 170.

  • § 150.0 Medium relevance — show source text

    Sizing 150.0(p) System power 140.4(k)1, 140.4(k)5, 170.2(c)4I

    Q

    Qualifying Lighting Systems 140.6(c), 170.2(e)4 Quality Insulation Installation (QII) 150.1(b)3, 150.1(c)1, 150.2(a)1A, 150.2(a)1B, 170.1(d), Table 170.2-A, 170.2(a)6, 180.1(a)1

    R

    R-4.2 120.4(a), 160.3(c) R-8 120.4(a), Table 150.1-A, Table 150.2-A, 160.3(c), Table 170.2-K, Table 180.2-C Radiant Barrier 110.8, 110.8(j), 150.1(c)2, Table 150.1-A, 150.2(a)1B, 150.2(b)1I, 170.2(a)1, Table 170.2-A, 180.1(a)1, 180.2(a) Radiation 110.8(g), 110.9(b)6, 120.3(b), 120.4(f), 150.0(m) Rafter Area 150.2(b)2 Rafter Ceiling 150.2(a)1B Rafter Roof Insulation 150.0(a) Rainwater Catchment 110.10(b)1A, 110.10(b)1B Raised Floor 141.0(b), 150.0(d), 150.1(c)1, 170.2(a)5, 180.2(a)2 Floor insulation 150.0(d) Framed floor 141.0(b)1C, 180.2(a) Mass floor 120.7(c)1, 141.0(b)1C, 160.1(c), 180.2(a) Wood floor 160.1(c) Rated Airflow 140.4(e)2 Capacity 140.4(h), 170.2(c) Efficiency 140.4(h) Energy capacity 140.10(b), 170.2(h) Output 140.8(b)3 Power capacity 140.10(b), 170.2(h) Volume 150.1(c)8 Readily Accessible Control 150.0(e), 160.1(f), 160.5(a)2, 160.5(b)4 Receptacle Control 130.4(a) Recirculated Air 120.1(c)1, 120.1(c)4, 150.0(m), 160.1(b), 160.2(c)1 Recirculating System Piping 120.3(a) Recirculation 120.1(g) Distribution system 150.0(n), 150.1(c), 150.2(b)1H, 170.2(d), 180.2(b)3 Limitations (air) 120.1(g), 160.2(c)8 Loop 110.3(c)4, 150.0(n), 150.1(c)8, 160.4, 170.2(d) Recooling 120.6(j), 140.4(d), 170.1(d), 170.

  • § 140.4 Medium relevance — show source text

    4(d), 140.4(e), Table 140.4-G, 140.4(f), 140.4(g), 140.4(h), 140.4(k), 140.4(m), 140.4(n), 140.4(p), 140.4(q), 140.6(a), 141.1(b), 141.1(d), 150.0(h), 150.0(k), 150.0(m), 160.3(a), 160.3(b), 160.3(c), 160.3(d), Table 160.3-D, Table 160.4A, 160.4(f), 160.5(a), 170.2(c), Table 170.2-G, 170.2(d), 170.2(e), 180.2(b)2 Ventilation air Table 120.1-A, 120.1(d), 120.1(h), 130.1(f), 140.9(a), 140.9(c)1, 150.0(o), 150.2(a), 160.2(c), 160.3(d)1, 160.5(b), 170.1(d), 170.2(c), 180.1(b), 180.2(b) Outdoor Air 120.1(c)1 Outdoor Areas Building facade 130.2(b), 160.5(c)1, Table 140.7-B Carport 140.10(a), 150.1(c)14A, 170.2(f), 170.2(g) Hardscape 130.1(c)7, 130.1(d), 130.2(b), 140.7(c), 140.7(d), Table 140.7-A, Table 140.7-B, 141.0(b), 160.5(b), 170.2(e)6, Table 170.2-R, Table 170.2-S, 180.2(b)4 Outdoor sales lot 141.0(b)2L, 180.2(b) Parking lot 140.7(d), 141.0(b)2L, 150.0(k)3, 160.5(c)2, 170.2(e)6 Public monuments 130.2(b), 140.7(a), 160.5(c)1, 170.2(e)6A Outlet 110.3(c), 120.3(a), Table 120.6-C, Table 120.6-E, 120.6(e), 130.5(c), 140.4(p), 150.0(h), 150.0(k), 150.0(m)8, 150.0(o), 150.0(s), 160.2(c), 160.3(b), 160.5(a), 160.6(c) Output Capacity 140.4(g), 150.0(h) Output Wattage 140.8(b)3, 170.2(e) Outside Air 120.1(c), 120.1(d), 120.1(f), 140.4(e)1, 140.4(k), 140.9(a), 141.1(b), 150.0(d), 150.0(m)12, 150.1(c), 160.1(c), 160.2(b)1, 160.2(c), 170.2(c) Outside Air Temperature 140.4(k)4, 140.9(a), 141.1(b), 170.

  • § 140.4 Medium relevance — show source text

    4(a), 140.4(i-k), 160.3(d)1H, P, Table 160.3-C, Table 160.6-B, 170.2(c)1, 170.2(c)3, 170.2(c)4G, H, I Chiller Isolation 10-103.2(c), 140.4(k)2, 170.2(c)4I Chimney 110.10(b)3 Church 120.2(e), 130.1(c)4, 140.3(c) Circuit Breaker 110.9(c), 110.10(e), 150.0(n), 150.0(t-v), 160.4(a)1B, 160.9(a-c) Circuit Controls 130.5(d), 141.0(b)2P, 160.6(d), 180.2(b)4B Circulating Air 140.4(c), 170.2(c)4A Circulating Pump 110.2(e)1, 110.3(c)2 Circulation Control 110.4(b) Cladding Material 150.2(b)1I Class 1 Air 120.1(g), 160.2(c)8 Class 2 Air 120.1(g), 160.2(c)8 Class 3 Air 120.1(g), 160.2(C)8 Class 4 Air 120.1(g), 160.2(c)8

    Classification of Dwelling Unit High Luminous Efficacy Light Sources Table 160.5-A Clean-Filter Pressure Drop 150.0(m)12, 150.0(m)13B, Table 150.0-B, C, 150.1(c)7A, 150.2(b)1F, 160.2(b)1, 160.3(b)5L, Table 160.3-A, 180.2(b)2A Clearance 150.0(H)3A, 150.0(K)1C, 160.3(b)3, 160.5(a)1C Climate Zone Figure 100.1-A, 100.2, 120.6(A), 120.6(b), 140.0(c), 140.3(a)1, 140.3(a)8, 140.3(c), 140.4(a)2, 140.4(e)1, 140.4(h), 140.4(k)8, 140.4(q), 140.5(a)1, 140.10(b), 141.0, 141.0(b)2B, 150.0(a)1, 150.0(g), 150.1(a), 150.1(b)3, 150.1(c), 150.1(c)6, 8, 11, 150.2(a)1B, 150.2(b)1B, 150.2(b)1D, 150.2(b)1E, 150.2(b)1F, 150.2(b)1H, 150.2(b)1I, 150.2(b)1J, 160.1(d), 160.3(b)5, 170.0(a), 170.1(d)1, 170.2, 170.2(a)3A, 170.

  • § 110.9 Medium relevance — show source text

    110.9, 110.10(b)1A, 110.10(b)1B, 110.12(c-e), 120.1(d)5E, 120.6(b)3, 120.6(f), 120.6(h)2-3, 120.6(h)6, 120.8(c)2, 130.0, 130.1, 130.2, 130.3, 130.4, Table 130.5-B, 140.1(a-b), 140.3(c)3, 140.3(d), 140.4(b)6, 140.6, 140.7, 140.8, 141.0, 141.1(c)3, 150.0(k), 150.0(s)2, Table 150.0-A, 150.2(b)1K, 160.2(c)5E, 160.5, Table 160.6-B, 170.1(a-b), 170.2(b), 170.2(c)2F, 170.2(e), 180.0, 180.1(a), 180.2(b)4, Table 180.2-E Accent luminaire 140.6(c)3G, 170.2(e)4B Actual lighting power 140.7(c), 170.2(e)6C Additional lighting power allowance 140.6(c)2G, 140.6(c)3E, 140.7(d), 170.2(e)4A, 170.2(e)6D, Table 140.7-B Adjusted indoor lighting power 140.6, 170.2(e) Allowed indoor lighting power 140.6, 170.2(e)1, 170.2(e)3, 170.2(e)4 Allowed outdoor lighting power 140.7(a), 170.2(e)6A Area category method 130.1(c)6A, 130.1(c)7A, 140.6(b)3, 140.6(b)4, 140.6(c)2, 170.2(e)3, 170.2(e)4 Area Category Method - Lighting Power Density Values Table 140.6-C, Table 170.2-M

    310 2025 CALIFORNIA ENERGY CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Area wattage allowance (AWA) 130.1(d)3D, 140.7(d)1A, Table 140.7A, 170.2(e)6D, Table 170.2-R Backlight, uplight, and glare (BUG) 130.2(b), 160.5(c)1 Ballast 10-103.1(c)3B, 130.0(c), 130.1(c)7B, 140.8(b), 141.0(b)2I, 141.0(b)2M, 141.1(c)3, Table 150.0-A, Table 160.5-A, 160.5(b)1, 160.5(b)4C, Table 160.5-B, 170.2(e)7B, 180.2(b)4B, 180.2(b)4B Bridge lighting 130.2(b), 140.7(a)8, 140.7(d)1A, 160.5(c)1, 170.

  • § 160.3 Medium relevance — show source text

    3(b)5E, 160.3(c)2E Compressor 120.2(I), 120.6(A)3-5, 120.6(A)7, 120.6(b)1-2, 120.6(e), 140.4(k)5, 150.0(m)13, 150.2(b)1F, 160.3(a)2H, 160.3(b)5L, Table 170.2-H, 170.2(c)4C, 170.2(d)2, 180.2(b)2A Computer Room Table 110.2-L, M, 120.6(j), 120.10(a), 140.4(d), 140.4(e)1, 140.4(f), 140.9(a), 141.1(b), 170.2(c)4 Concrete Masonry 120.7(B), 140.3(A)9, 160.1(a)4, 5 Concrete Slab 120.4(A), 150.0(E), 150.0(F), 150.1(c)1D, 160.1(f)2, 160.3(c)2B, 170.2(a)5B Condensate Drain 150.0(N), 160.4(A) Condenser 110.2(a), 120.6(a)4, 120.6(b)1 Efficiency 120.6(a)4G, 120.6(b)5 Fan 120.6(a)4D, 120.6(b)1A, 140.4(h), 170.2(c)4F Water reset controls 120.5(a)16, 160.3(d)1P Water system 140.4(k)6, 170.2(c)4I Condensing Coil 150.2(B)1F, 180.2(B)2A Condensing Temperature Table 110.2-F, 120.6(a)4, Table 120.6-B, 120.6(a)5B, 120.6(a)8G, 120.6(b)1, 120.6(b)2C, 120.6(b)5G, 140.4(h)1, 170.2(c)4F Condensing Unit Table 110.2-A, Table 110.2-L, Table 110.2-M, 120.6(a)4B, 120.6(b)2, 141.0(b)2D, E, 150.0(h)3, 150.2(b)1C, 150.2(b)1E, 160.3(b)3, 180.2(b)2 Conditioned Air 120.4(g), 141.0(b)2D, 150.0(m)1, 11, 160.3(b)5, 160.3(c)2H, 180.2(b)2B Floor area (CFA) 10-103(a), 100.0(f), 120.1(d)4E, 120.2(g), 120.4(g), 120.6(b), 140.1, 140.3(a)9C, 140.4(g), 140.10(a), 140.10(b), 141.0(b)2D, 150.0(q)1, 150.1(c)3, 8, 12, 14,

  • § 120.9 Medium relevance — show source text

    120.9(b), 160.4(e)2

    Airflow Equation 120.1-A, 120.6(a)3B, 120.6(c)2, 140.4(c)1, Table 140.4-J, Table 140.4-K, 170.2(c)4 Airflow rate 140.4(q)2, 150.0(m)12B, D, Table 150.0-B, Table 150.0-C, 160.2(b)1, 2C, Table 160.3-A, Table

    160.2-B Capacity 120.6(c)1, 140.4(k)4, 170.2(c)4I Conditions 120.6(b)4A, 120.10(a), 140.4(b)2, 140.4(b)3, 140.4(c)1, 140.4(k)8B, 140.4(q), 140.9(a)2, 140.9(c)3B, 150.0(h), 160.3(b)2, 170.2(c)2-4 Data 140.4(b)9, 170.2(c)2I Flow rate 140.4(k)1, 170.2(c)4I Load 110.10(b)4, 140.4(a), 140.4(b)1, 11, 12, 140.4(g), 140.9(a), 141.1(b), 170.2(c)2 Phase 120.8(b), 120.8(c), 120.8(d)2, 120.8(f) Phase design review 120.8(a)3, 120.8(d) Review 10-103, 120.8, 120.8(a), 120.8(d) Supply 140.4(e)1, 140.4(f)2, 170.2(c)4C, D, O Temperature 140.4(b)2, 140.4(b)3, 140.4(j), 150.0(h), 160.3(b)2, 170.2(c)2, 170.2(c)4H Ventilation 120.1(d), 120.6(c)7, 160.2(b)2A, 160.2(c)5 Wattage 120.6(c), 120.6(d)3, 120.6(j)3, 120.9(b), 140.4(k)6, 160.4(e)2, 170.2(c)4I Zone 140.4(d), 170.2(c)4B Designated Efficiency 120.1(c)1B, 150.0(m)12C, 160.2(b)1C, 160.2(c)1B Designated Solar Zone 110.10(b)1A, 110.10(b)1B Diagnostic Evaluation 140.3(a)9, 141.0(b)2Q Diagnostic Testing 10-103(a)5, 110.1(c), 120.4(g)1, 141.0(b)2D, 141.0(b)2E, 150.0(m)1, 150.0(m)11, 150.0(m)13, 150.0(o), 150.1(c)7, 150.1(c)9, 150.1(c)10, 150.2(b)1D, 150.

  • § 140.6 Medium relevance — show source text

    6(a)2K, 140.6(a)3, 141.1(c)3, 170.2(e)2B, 170.2(e)2C Lighting wiring 141.0(b)2I, 180.2(b)4B Lighting zone 10-114(b-c), Table 140.7-A, 170.2(e)6A, Table 170.2-R Line voltage lamp holder 130.0(c)2 Linear lighting 130.0(c)5, 160.5(b)1E Linear Wattage Allowance (LWA) 140.7(d)1D Line-voltage track lighting 110.9(c), 110.9(d) Low-voltage lighting 130.0(c)6, 160.5(b)1F Low-voltage luminaire 130.0(c)1B, 160.5(b)1A Lumen output 110.9(b)3C Lumens 130.1(c)7B, 130.2(b), 150.0(k)1A, 160.5(a)1A, 160.5(b)4C, 160.5(c)1 Luminaire 130.0(c)1B, 130.1(b), 130.1(c)6D, 130.1(c)8, 130.2(b), 130.2(c)3A, B, 140.6(a)2, 4, 140.6(c)2G, H, Table 140.6-A, 140.7(a), 140.7(d)1A, Table 140.7-A, 141.0(b)2I, L, 150.0(k)1, 150.0(k)2E, 150.2(b)1K, 160.5(a)1, 2E, 160.5(b)1A, D, F, 160.5(b)4B, C, Table 160.5-B, 160.5(c)1, 160.5(c)2C, 170.2(e)2 B, D, Table 170.2-L, 170.2(e)6A, D, Table 170.2-R, 180.2(b)4 Luminaire classification 130.0(c), 140.6(a)4A, 160.5(b)1, 170.2(e)2D Luminaire efficacy 150.0(k)1A, 150.2(b)1K, 160.5(a)1A, 180.3(b)4A

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    INDEX

    Luminaire housing 130.0(c)1B, 150.0(k)1C, 160.5(a)1C Luminaire power 130.0(c) Luminaire requirements 150.0(k)1, 160.5(a)1 Luminaire shielding 130.2(b), 160.5(c)1 Luminaire wattage 130.0(c)1, 130.0(c)6A, 140.6(c)3G, 160.5(b)1A, F, 170.2(e)4B Lighting Allotment 140.6(b), 140.6(c)1D, 140.6(c)3B, E, F, 170.

  • § 150.0 Medium relevance — show source text

    150.0(c), 150.0(d),
    150.0(e), 150.0(g), 150.0(q)|110.6, 110.7, 110.8, 150(a),
    150.0(b), 150.0(c), 150.0(d),
    150.0(e), 150.0(g), 150.0(q)|110.6, 110.7, 110.8, 150(a),
    150.0(b), 150.0(c), 150.0(d),
    150.0(e), 150.0(g), 150.0(q)| |Single-family|HVAC (conditioned)|110.2, 110.5, 150.0(h), 150.0(i),
    150.0(j), 150.0(m), 150.0(o)|110.2, 110.5, 150.0(h), 150.0(i),
    150.0(j), 150.0(m), 150.0(o)|110.2, 110.5, 150.0(h), 150.0(i),
    150.0(j), 150.0(m), 150.0(o)|110.2, 110.5, 150.0(h), 150.0(i),
    150.0(j), 150.0(m), 150.0(o)| |Single-family|Water Heating|110.3, 150.0(j, n)|110.3, 150.0(j, n)|110.3, 150.0(j, n)|110.3, 150.0(j, n)| |Single-family|Indoor Lighting
    (conditioned, unconditioned
    and parking garages)|110.9, 130.0, 150.0(k)|110.9, 130.0, 150.0(k)|110.9, 130.0, 150.0(k)|110.9, 130.0, 150.0(k)| |Single-family|Outdoor Lighting|110.9, 130.0, 150.0(k)|110.9, 130.0, 150.0(k)|110.9, 130.0, 150.0(k)|110.9, 130.0, 150.0(k)| |Single-family|Pool and Spa Systems|110.4, 150.0(p)|N.A.|N.A.|N.A.| |Single-family|Solar Ready Buildings|110.10|N.A.|N.A.|N.A.| |Single-family|Electric Ready|150.0(s), 150.0(t), 150.0(u),
    150.0(v)|N.A.|N.A.|N.A.| |Single-family|Solar PV Systems|N.A.|150.0(c)14|150.1(a), (b)|N.A.| |Multifamily|General|160.0|170.2|170.1|180.0| |Multifamily|HVAC (conditioned)|110.6, 110.7, 110.8, 160.1|170.1(a)|170.1(a)|170.1(a)| |Multifamily|Ventilation and Indoor Air Quality|160.2|N.A.|N.A.|N.A.| |Multifamily|HVAC (conditioned)|110.2, 110.5, 160.3|170.2(c)|170.2(c)|170.

  • § 140.9 Medium relevance — show source text

    INDEX

    140.9(b)3, 140.9(c), 160.3(d)1, 160.3(d)2, 160.3(d)3, 160.5(e)1, 3 Compliance 10-103(a), 120.8(d), 150.1(b)3, 170.1(d) Installation 10-103(a)3, 150.1(b)3, 150.1(c)7, 150.2(b)1F Verification 10-103(a)5, 150.1(b)3 Certification 110.0(B), 110.2, 110.3(A), 110.4(a), 110.6(a), 110.8(a), 110.8(g), 110.9(c), 110,11, 120.5(b), 130.4(b), 130.4(c), 140.9(a)4, 150.0(n)3, 160.3(d)3, 160.4(c), 160.5(e) Certification Identification Number 10-103(C)3G, 120.5(B), 130.4(c), 160.3(d)3, 160.5(e) Certification Requirements 110.0(B), 110.6(a)1, 110.8(g)1 Certified 110.6(a)6, 110.8(i)1, 120.5(a) Equipment 110.4(a)1, 150.0(h), 150.0(p)1A Lighting Controls Acceptance Test Employer 130.4(c), 160.5(e) Mechanical Acceptance Test Employer 120.5(b), 160.3(d)3 Mechanical Acceptance Test Technician (CMATT) 120.5(b), 160.3(d)3 CFA and Dwelling Unit Adjustment Factors Table 150.1-C, Table 170.2-T CFM Per Square Foot 110.6(A)1, 120.1(D)3, 120.6(c)5, 140.3(a)9, 140.4(e)1, 141.0(b)2Q, 150.1(c)12A, Table 160.2-B, Table 160.2-C, 170.2(c)4N CFM Per Ton 150.0(M)13, 150.1(C)7, 150.2(B)1F, 160.3(b)5L, 170.2(c)3B, 180.2(b)2A Chalk Board 140.6(b)4 Chilled Water piping 120.3(b)2, 160.3(c)1C, 160.4(f)2B Water plant Table 120.2-A, 140.4(h)5, 140.4(j), Table 160.3-C, 170.2(c)4F Water system 120.6(h), 140.4(k)2, 140.4(m), 170.2(c)4C, I, K Water system cooling capacity Table 140.4-E, Table 170.2-E-2 Chiller 10-103(c)3B, 110.2(a), Table 120.2-A, 120.5(a)8, 16, 120.6(b)2A, Table 130.5-B, 140.

  • § 120.1 Medium relevance — show source text

    F

    Factory Calibrated 120.1(d)4F, 120.5(a)4, 120.6(c)7B, 140.9(c)3C, 140.9(c)3D, 160.2(c)5D, 160.3(d)1D Factory-built fireplace 150.0(e), 160.1(f) Factory-fabricated duct system 120.4(b)1, 150.0(m)2, 160.3(b)5B, 160.3(c)2C Factory-installed label 110.9(c)2, 130.0(c)1, 140.3(d)2J, 160.5(b)1A Fan 120.10(a), 150.0(m) Airflow 120.6(c)1, 140.4(m), Table 140.4-J, Table 140.4-K, Table 150.5-H, 150.1(c)12B, Table 160.2-H, 170.2(c)4K, 170.2(c)4O, Table 170.2-I, Table 170.2-J Array 120.10(a), 140.4(c)1, 170.2(c)4A Capacity 140.4(c)2, 170.2(c)4A Control 120.6(j)3, 140.4(m), 170.2(c)4K Control systems Table 140.4-I Efficacy 150.0(m)12D, 150.0(m)13, 150.0(o)2C, 150.1(b)3B, 150.1(c)10, 160.2(b)1D, 160.2(b)2A, 160.2(b)2B,160.3(b)5L, 170.1(d)2F, 170.1(d)3B, Table 170.2-K Energy index (FEI) 120.10(a) Fan-coil motor 140.4(c)3

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    INDEX

    Vertical fenestration 140.3(d)2, 140.3(d)3, Table 140.3-E, Equation 140.3-C, Table 140.6-A, 141.0(b)2A, Table 141.0-A, 150.2(b)1A, 150.2(b)1B, 150.3(a)5D, 170.2(a)3A, Equation 170.2-A, Table 170.2-L, 180.2(b)1C Vertical glazing 130.1(d)5, 140.3(a)5C, 160.5(b)4D, 170.2(a)3A Vertical window 140.3(a)3, 140.3(a)5, 170.2(a)2B, 170.2(a)3A Visible reflectance 140.3(d)2E, 140.3(d)3F Visible Transmittance (VT) 10-111, 110.6(a)4, Table 110.6-A, Table 110.6-B, 140.3(a)5D, Equation 140.3B, 140.3(c)4, 140.3(d)2F, 170.

  • § 160.4 Medium relevance — show source text

    0(n), 160.4(a) Service 110.10(c), 110.10(e), 130.5(a), 140.4(i), 141.0(b)2P, 150.0(n, t, u, v),

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    INDEX

    160.2(b)2, 160.2(c)1A, 160.2(c)8, 160.3(d)2, 170.2(c)3B, 170.2(c)4 Recovery bypass 140.4(q), 170.2(c)4N, 170.2(c)4O Recovery requirements by Climate Zone and percent outdoor air at full design airflow (<8,000 hours / year) Table 140.4-J, Table 170.2-I Recovery requirements by Climate Zone and percent outdoor air at full design airflow (8,000 hours / year) Table 140.4-K, Table 170.2-J Star program 110.10(b)1A, 110.10(b)1B, 140.9(a)4 Storage System (ESS) 140.4(i), 140.4(j), 150.0(s), 170.2(c)4 Use 120.3(c), 130.5(a), 140.4(a)1, 140.4(e), 140.4(f), 141.0(a)2, 150.2(a)2B, 160.3(c)1, 160.6(a), 170.2(c)1, 170.2(c)4, 180.1(b)2 Enforcement Agency 10-103(d), 10-105, 110.6(a)5, 110.6(a)5, 110.6(a)6, 110.9(c), 110.9(d), 110.10(a), 120.5(a), 120.6(a)7, 120.6(b)6, 120.6(c)8, 120.6(e)6, 120.6(f)5, 120.6(g)2, 120.6(i)4, 130.1(a), 130.1(c)1, 130.4(a), 140.0(c), 140.3(a)8, 140.3(d)2, 140.9(b)3, 140.9(c)3-4, 160.2(a), 160.3(d)1, 160.3(d)2, 160.5(b)4, 160.5(e)1 Entire Building 110.10(b)1B, 120.1(d)2, Equation 140.3-B, 140.3(a)9C, 140.4(g), 140.6(b)3A, 140.6(c)1, 141.0(b)2A, 141.0(d), 150.2(b), 160.2(c)5B, Equation 170.2-B, 170.2(c)4E, 180.2(b)1C, 180.4 Envelope 110.7, 120.0, 120.2(a)1, 120.6(h)4, 120.8(b)5, 120.8(c)5, 140.3(a), 140.3(d)2H, 140.

  • § 170.2 Medium relevance — show source text

    EQUATION 170.2-C—ANNUAL PHOTOVOLTAIC ELECTRICAL OUTPUT

    kW PV = (CFA × A)/1000 + N DU × B)

    where:

    kW PV = kW dc size of the PV system.

    CFA = Conditioned floor area.

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    MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

    N DU = Number of dwelling units.

    A = CFA adjustment factor from Table 170.2-T.

    B = Dwelling unit adjustment factor from Table 170.2-T.

    Exception 1 to Section 170.2(f): For steep slope roofs, SARA shall not consider roof areas with a northerly azimuth that lies between 300 degrees and 90 degrees from true north. No PV system is required if the SARA is less than 80 contiguous square feet.

    Exception 2 to Section 170.2(f): No PV system is required when the minimum PV system size specified by Section 170.2(f) is less than 4 kW dc .

    Exception 3 to Section 170.2(f): Buildings with enforcement-authority-approved roof designs, where the enforcement authority determines it is not possible for the PV system, including panels, modules and components and supports and attachments to the roof structure, to meet the requirements of American Society of Civil Engineers (ASCE) Standard 7-16, Chapter 7, Snow Loads.

    Exception 4 to Section 170.2(f): For buildings that are approved by the local planning department prior to January 1, 2020 with mandatory conditions of approval: a. Shading from roof designs and configurations for steep slope roofs shall be considered for the annual solar access calculations; and

    b. Roof areas that are not allowed to have PVs by the mandatory conditions of approval shall not be considered in determining the SARA.

    Exception 5 to Section 170.2(f): PV system sizes determined using Equation 170.2-C may be reduced by 25 percent if installed in conjunction with a BESS. The BESS shall meet the qualification requirements specified in Joint Appendix JA12 and have a minimum cycling capacity of 7.5 kWh as defined in Joint Appendix JA12.

    TABLE 170.2-T—CFA AND DWELLING UNIT ADJUSTMENT FACTORS Col2 Col3
    CLIMATE ZONE A—CFA B—DWELLING UNITS
    1 0.793 1.27
    2 0.621 1.22
    3 0.628 1.12
    4 0.586 1.21
    5 0.585 1.06
    6 0.594 1.23
    7 0.572 1.15
    8 0.586 1.37
    9 0.613 1.36
    10 0.627 1.41
    11 0.836 1.44
    12 0.613 1.40
    13 0.894 1.51
    14 0.741 1.26
    15 1.56 1.47
    16 0.59 1.22

    (g) **Photovoltaic requirements—more than three habitable stories.

  • § 150.0 Medium relevance — show source text

    0(b)1C, 150.0(a), 150.0(c), 150.0(d), 150.0(k)1, 150.0(m)1, 150.0(q), 150.1(c)5, 150.2(a)1A, 150.2(b)1D, 160.1(a), 160.1(b), 160.1(c), 160.1(e), 160.3(b)5, 160.3(c), 170.2(a)4, 170.2(e)3, 180.2(a), 180.2(b)2 Undershelf Lighting 150.0(k)2, 160.5(a) Underwriters Laboratories (UL) 110.2(f), 120.4(b)1, 2, 120.4(c), 130.0(c), 150.0(m)1, 150.0(m)2, 150.0(m)3, 160.3(b)5A-F, 160.3(c)2, 160.5(b)1 Unfiltered Incandescent Lamps 140.8(b)6 Unframed Wall 150.1(c)1 Uninterruptible Power Supply (UPS) 110.11(a), 130.5(d), Table 140.9-B, 140.9(a)4, 141.1, 160.6(d)3 Unit Controls (Space Conditioning System) 140.4(e)2, 160.3(d)1, 170.2(c)4C

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    INDEX

    Water Absorption rate 110.8(g)1, 150.0(f) Boilers 140.4(k)8 Circulation 110.4(b), 140.4(k)5, 170.2(c)4I Cooling system 140.4(e)1 Economizer 140.4(e)1, 140.4(e)3, 140.9(a), 141.1(b), 170.2(c)4C Flow 110.2(a), 110.10(b), 140.4(k)6, 170.2(c) Heater 110.3(c)3, 110.3(c)5, 110.3(c)6, 110.8(d)2, 120.3(a), 140.5(a), 140.5(c), 150.0(n), 150.1(c), 150.2(a)1D, 150.2(b), 160.4(a), 160.4(d), 170.2(d), 180.1(a)3 Heating 110.3(b), 110.3(c)4, 120.8(c), 140.1(a), 140.1(b), 141.0(b)3, Table

    150.1-A Heating system 110.3(a), 110.3(a)1, 110.3(c), Table 120.3-A, 120.8(c), 140.5, 141.0(a)1, 141.0(a)2, Table 141.0-E, 141.0(b)2, 141.0(b)2M, N, O, 150.0(n), 150.2(b)1H, Table 150.2-D, 160.4, 170.2(d), 180.

  • § 170.2 Medium relevance — show source text

    4(k)6, 170.2(c)4I Condensing Coil 150.2(B)1F, 180.2(B)2A Condensing Temperature Table 110.2-F, 120.6(a)4, Table 120.6-B, 120.6(a)5B, 120.6(a)8G, 120.6(b)1, 120.6(b)2C, 120.6(b)5G, 140.4(h)1, 170.2(c)4F Condensing Unit Table 110.2-A, Table 110.2-L, Table 110.2-M, 120.6(a)4B, 120.6(b)2, 141.0(b)2D, E, 150.0(h)3, 150.2(b)1C, 150.2(b)1E, 160.3(b)3, 180.2(b)2 Conditioned Air 120.4(g), 141.0(b)2D, 150.0(m)1, 11, 160.3(b)5, 160.3(c)2H, 180.2(b)2B Floor area (CFA) 10-103(a), 100.0(f), 120.1(d)4E, 120.2(g), 120.4(g), 120.6(b), 140.1, 140.3(a)9C, 140.4(g), 140.10(a), 140.10(b), 141.0(b)2D, 150.0(q)1, 150.1(c)3, 8, 12, 14, 150.2(a)1B, 150.2(a)1C, 150.2(a)2C,

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    INDEX

    Units 120.1(e), Table 140.4-E, 160.2(c)6, Table 170.2-E, 170.2(c)4N Corner Opening 120.1(C)2A, 160.2(C)2 Cover Plates 110.9(c) Covered Occupancies 110.10(a) Parking 110.10(b)1B, 140.10(a)1, 150.1(c)14, 170.2(f)A, 170.2(g)1 Process 120.0, 120.1(f)1, 120.6, 120.7, 141.0(a), 141.0(b), 160.2(c)7A, 170.1(a), 170.1(b) 180.0 Processes 100.0(e)2F, 120.0, 120.6, 120.8, 140.9, 141.1, 160.7 Covers 110.4(A), 110.4(B) Crawl Space 120.4(A), 150.0(D), 150.0(G), 150.1(c)1, 160.1(c), 160.1(d), 160.3(c)2B, 2H, 160.4(f)1, 180.2(b)2B Critical Point 120.6(A)8, 120.

Frequently asked questions

How do I find the correct B value to use?

Get B from Table 140.10‑B for nonresidential projects or Table 170.2‑V for multifamily >3 stories, selecting the row for your building type and the column for your climate zone (CZ) .

What if my PV was SARA‑sized?

Use the SARA‑adjusted equations (Equation 140.10‑C or 170.2‑F): multiply the base kWh result by the ratio kW PVdc,SARA / kW PVdc (the SARA PVdc and the base PVdc come from the PV sizing equations) .

When can I avoid installing a BESS?

Exceptions allow no BESS when the installed PV capacity is less than 15% of the PV capacity determined by the PV equation or when the computed BESS usable capacity is less than 10 kWh (among other tenant/single‑tenant exceptions). Check the exceptions in § 140.10(b) and § 170.2(h) .

Do I use manufacturer round‑trip efficiency or a default?

Use the rated single charge‑discharge AC‑to‑AC (round‑trip) efficiency reported by the BESS manufacturer; that value is the C in the equation and must be applied as shown in the Code equations .

Once I have kWh batt, how do I size power (kW)?

The Code requires minimum rated power capacity = kWh batt / 4 (Equation 140.10‑D or 170.2‑G) .

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