Equation 9-3

kWhbatt = kWPVdc x B / D^0.5

WHERE:

kWhbatt = Rated Useable Energy Capacity of the battery storage system in kWh

kWPVdc = PV system capacity required by section 9.2 in kWdc

B = Battery energy capacity factor specified in Table 9.6 for the building type

D = Rated single charge-discharge cycle AC to AC (round-trip) efficiency of the battery storage system