The 2022 Energy Code now requires that all single-family buildings with one or two dwelling units must be energy storage (battery storage) system ready.
These requirements are mandatory but do not apply to:
- Additions
- Alterations
- Newly constructed buildings with all battery storage installed
To facilitate the future installation of battery storage systems, newly constructed single-family buildings with one or two dwelling units are required to be energy storage ready.
An energy storage system is defined in the 2022 Energy Code as one or more devices assembled together to store electrical energy and supply electrical energy to selected loads at a future time.
The requirements in Section 150.0(s) of the 2022 Energy Code include:
- Either:
- An ESS ready interconnection equipment with a minimum backed-up capacity of 60 amps and a minimum of four ESS-supplied branch circuits (See Figure 2); or
- A dedicated raceway at least 1 inch from the main service panel to a subpanel that supplies the branch circuits
- A minimum of four branch circuits and their source at a single panelboard supplied by the ESS. At least one circuit shall supply:
- Refrigerator,
- Lighting near primary egress, and
- Sleeping room receptacle outlet
- The main panelboard must have a minimum busbar rating of 225 amps
- A space reserved for a future installation of isolation equipment/transfer switch within 3 feet from the main panel
See the Blueprint for more information, including articles and frequently asked electric ready questions, about the 2022 Energy Code.