Can a nonresidential building be excluded from a battery storage system?

Four exceptions can exclude nonresidential buildings from the battery storage system requirements: Single-tenant buildings with < 5,000 square feet of conditioned floor area (CFA). For multi-tenant buildings, the battery storage system energy and power capacities are based on tenant spaces > 5,000 square feet of CFA

Can a battery storage system be used as a standalone system?

A battery storage system can be installed as a standalone system for additional compliance credit, when not required prescriptively. Also, a battery system larger than the prescriptive requirement can be used to tradeoff for a smaller solar PV system. Are There Exceptions? Yes.

Is the battery storage system self-certified?

Yes. The battery storage system is self-certified by the manufacturer to the CEC to meet the JA12 qualifications - PDF to comply with applicable prescriptive and performance requirements in the Energy Code. For more information, please visit the manufacturer certifications of building equipment Battery and Energy Storage Systems webpage.

Does a battery storage system need a rated usable energy capacity?

No. For compliance with the Energy Code the rated usable energy capacity of the battery storage system in kWh must be used for Equation 140.10-B - PDF. The usable capacity is the battery energy storage capacity in kWh that a manufacturer allows to be used for charging and discharging.

What is the required battery storage system size?

The required battery storage system size is based on the solar PV system size determined for building types listed in Table 140.10-B, including mixed-occupancy buildings. The total capacities of a battery storage system shall be no less than those calculated from the equations above.

What types of energy storage systems are required under NEC 706?

NEC 706 has several key requirements for energy storage systems, including appropriate overcurrent protection for energy storage circuits, maximum voltage between conductors, and guidelines for flow battery energy storage systems. Some typical energy storage systems include kinetic energy devices, capacitors, and batteries.