Home Battery Backup with Solar
Learn how stored solar or grid power can keep important parts of your home running when utility power goes out.
Already Have Solar?
- 1Most ordinary grid-connected solar systems shut down during a utility outage for safety.
- 2Battery backup requires compatible solar, inverter/controller, and electrical equipment.
- 3A properly configured solar-plus-storage system can isolate from the grid and may continue using solar energy during an outage.
Have an installer verify compatibility with your existing solar equipment before choosing a battery.
How Long Will a Home Battery Last?
Illustrative example: 13.5 kWh battery
- About 1 kW average loadRoughly 13 hours
- About 2 kW average loadRoughly 6–7 hours
- About 4 kW average loadRoughly 3–4 hours
Illustrative planning examples, not product guarantees. Actual runtime varies with usable capacity, reserve settings, system losses, appliance cycling, weather, and solar production.
What to Compare When Shopping for a Home Battery
Usable capacity
kWh available to store energy
Continuous output
How much power the battery can provide at once
Motor-start / surge capability
Important for pumps and HVAC
Solar compatibility
Whether it works with an existing or planned solar system
Expandability
Whether additional battery capacity can be added later
Warranty
Years, cycles, and retained-capacity terms