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Live electrical work is hazardous. A licensed pro will evaluate service capacity, pull permits, and follow code and manufacturer instructions. Do not open panels or wire battery systems yourself.
List critical loads like refrigeration, heat, medical devices, lighting, and key outlets. Use nameplate ratings and typical usage to estimate simultaneous power (kW) and energy (kWh) needs.
Use utility bills (daily average) or a home energy monitor to estimate how many kWh you consume per day. Size the battery for desired hours or days of autonomy, considering reserve margins.
If you plan to add EV charging, heat pumps, or more solar, choose equipment and conduit sizes that can scale without rework.
AC-coupled batteries work with most existing solar inverters and can be added later with minimal disruption. They are slightly less efficient end-to-end than DC-coupled systems.
DC-coupled batteries share a hybrid inverter with new PV, reducing conversion losses. They are best chosen when installing solar at the same time.
Stackable batteries let you expand capacity later. Verify that adding modules does not require reprogramming or major rewiring.
Partial-home setups feed a critical loads subpanel for longer runtimes at lower cost. Whole-home backup requires larger
inverters, more batteries, and careful load management.
ATS/gateway devices isolate the home from the grid during outages and restore power automatically. Placement and wiring should follow manufacturer guidance and local code.
Battery inverters and gateways must be rated for and wired to your critical subpanel. Label circuits clearly and provide one-line diagrams for future service.
Some systems require specific inverters or communications. Check approved equipment lists and firmware requirements before purchase.
Time-of-use optimization, solar prioritization, and load control can reduce bills and extend runtime. Look for good monitoring apps and utility integration where available.
Washington has offered sales tax relief on qualifying solar-connected storage. The federal Investment Tax Credit (ITC) is 30% through 2032 for eligible battery systems. Always verify current eligibility and documentation before purchase.