Section 140.10 — California Energy Code (Title 24, Part 6)

PRESCRIPTIVE REQUIREMENTS FOR PHOTOVOLTAIC AND BATTERY

STORAGE SYSTEMS (a) Photovoltaic requirements. All newly constructed building types specified in Table 140.10-A, or mixed occupancy buildings where one or more of these building types constitute at least 80 percent of the floor area of the building, shall have a newly installed photovoltaic (PV) system meeting the minimum qualification requirements of Reference Joint Appendix JA11. The PV size in kWdc shall be not less than the smaller of the PV system size determined by

EQUATION 140.10-A PHOTOVOLTAIC DIRECT CURRENT SIZE

kWPVdc = (CFA x A)/1000

where:

kWPVdc = Size of the PV system in kW.

CFA = Conditioned floor area in square feet.

A = PV capacity factor specified in Table

140.10-A for the building type. Where the building includes more than one of the space types listed in Table 140.10-A, the total PV system capacity for the building shall be determined by applying Equation 140.10-A to each of the listed space types and summing the capacities determined for each. 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 size is less than 4 kWdc. Exception 3 to Section 140.10(a): No PV system is required if the SARA contains less than 80 contiguous square feet.

148 2022 CALIFORNIA ENERGY CODE

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NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES FOR

ACHIEVING ENERGY EFFICIENCY

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): Multitenant buildings in areas where a load-serving entity does not provide either a virtual net metering (VNEM) or community solar program. (b) Battery storage system requirements. All buildings that are required by Section 140.10(a) to have a PV system shall also have a battery storage system meeting the minimum qualification requirements of Reference Joint Appendix JA12. The rated energy capacity and the rated power capacity shall be not less than the values determined by Equation 140.10-B and Equation 140.10-C. Where the building includes more than one of the space types listed in Table 140.10-B, the total battery system capacity for the building shall be determined by applying Equations 140.10-B and 140.10-C to each of the listed space types and summing the capacities determined for each space type and equation.

EQUATION 140.10-B BATTERY STORAGE RATED ENERGY CAPACITY

kWhbatt = kWPVdc × B / D ^0.5

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

Exception 4 to Section 140.10(b): In Climate Zone 1, no battery storage system is required for offices, schools and warehouses.

TABLE 140.10-A PV CAPACITY FACTORS

where: kWhbatt= Rated useable energy capacity of the battery

storage system in kWh. kWPVdc= PV system capacity required by Section

140.10(a) in kWdc. B = Battery energy capacity factor specified in Table

140.10-B for the building type. D = Rated single charge-discharge cycle AC to AC

(round-trip) efficiency of the battery storage system.

EQUATION 140.10-C BATTERY STORAGE RATED POWER CAPACITY

kWbatt = kWPVdc × C

where: kWbatt = Power capacity of the battery storage system in

kWdc. kWPVdc= PV system capacity required by Section

140.10(a) in kWdc. C = Battery power capacity factor specified in Table

140.10-B for the building type. Exception 1 to Section 140.10(b): No battery storage system is required if the installed PV system size is less than 15 percent of the size determined by Equation 140.10-A. Exception 2 to Section 140.10(b): No battery storage system is required in buildings with battery storage system requirements with less than 10 kWh rated capacity.

	FACTOR A—MINIMUM PV CAPACITY (W/ft² of conditioned floor area)
CLIMATE ZONE	1, 3, 5, 16	2, 4, 6–14	15
Grocery	2.62	2.91	3.53
High-Rise Multifamily	1.82	2.21	2.77
Office, Financial Institutions, Unleased Tenant Space	2.59	3.13	3.80
Retail	2.62	2.91	3.53
School	1.27	1.63	2.46
Warehouse	0.39	0.44	0.58
Auditorium, Convention Center, Hotel/Motel, Library, Medical Office Building/Clinic, Restaurant, Theater	0.39	0.44	0.58

	FACTOR B— ENERGY CAPACITY	FACTOR C— POWER CAPACITY
Storage-to-PV Ratio	Wh/W	W/W
Grocery	1.03	0.26
High-Rise Multifamily	1.03	0.26
Office, Financial Institutions, Unleased Tenant Space	1.68	0.42
Retail	1.03	0.26
School	1.87	0.46
Warehouse	0.93	0.23
Auditorium, Convention Center, Hotel/Motel, Library, Medical Office Building/ Clinic, Restaurant, Theater	0.93	0.23

NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8 and 25943, Public Resources Code .

TABLE 140.10-B BATTERY STORAGE CAPACITY FACTORS

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SUBCHAPTER 6

NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—

ADDITIONS, ALTERATIONS AND REPAIRS

Additions, alterations, and repairs to existing nonresidential and hotel/motel buildings, existing outdoor lighting for these occupancies, and internally and externally illuminated signs, shall meet the requirements specified in Sections 100.0 through 110.10, and 120.0 through 130.5 that are applicable to the building project, and either the performance compliance approach (energy budgets) in Section 141.0(a)2 (for additions) or 141.0(b) 3 (for alterations), or the prescriptive compliance approach in Section 141.0(a)1 (for additions) or 141.0(b)2 (for alterations), for the Climate Zone in which the building is located. Climate zones are shown in Figure 100.1A.

Covered process requirements for additions, alterations and repairs to existing nonresidential and hotel/motel buildings are specified in Section 141.1.

Exception to Section 141.0: Alterations to healthcare facilities are not required to comply with this Section.

NOTES:

For alterations that change the occupancy classification of the building, the requirements specified in Section 141.0(b) apply to the occupancy after the alterations.
Relocation or moving of a relocatable public school building is not, by itself, considered an alteration for the purposes of Title 24, Part 6.

(a) Additions. Additions shall meet either Item 1 or 2 below.

Prescriptive approach. The envelope and lighting of the addition, any newly installed space-conditioning system, electrical power distribution system, or waterheating system; any addition to an outdoor lighting system; and any new sign installed in conjunction with an indoor or outdoor addition shall meet the applicable requirements of Sections 110.0 through 120.7, 120.9 through 130.5 and 140.2 through 140.9.
Performance approach.

A. The envelope and indoor lighting in the conditioned

space of the addition, and any newly installed spaceconditioning system, electrical power distribution system, or water-heating system, shall meet the applicable requirements of Sections 110.0 through 120.7, 120.9 through 130.5; and

B. Either: