Do you need one battery or several? Start with what you want to keep running, then ask the installer to show how the proposed system will do it.
By ProjectSide · October 21, 2026
Start here.
There is no battery count that fits every home. Kilowatts (kW) describe power available at a moment; kilowatt-hours (kWh) describe stored energy. Ask the installer to check both against your appliances and desired runtime.
Write down the loads that matter.
Separate essentials from equipment you can leave off. Refrigeration, lighting, communications and selected outlets may create a different design from one intended to run air conditioning, a well pump or an electric range. Have the installer assess the actual equipment and starting requirements.
Distinguish power from stored energy.
Power describes how much equipment can run at once; stored energy relates to how long it can run. A system can have substantial storage and still be unable to start a particular load. Ask for both ratings and the operating conditions behind them.
Treat runtime as a scenario, not a promise.
Illustrative arithmetic: 10 kWh available to loads averaging 1 kW gives 10 hours before accounting for losses, reserve settings or changing demand. Real equipment cycles, and actual usable energy varies. Ask the installer for a documented scenario using your loads rather than using this simple example to size a system.
Ask what happens after the first discharge.
Will the proposed arrangement recharge from solar while disconnected from the grid? How does weather affect that plan? Ask what happens if the battery reaches its reserve and which circuits remain supported. Compatibility and controls matter as much as the equipment name.
Request an itemized backup scope.
The proposal should identify backed-up circuits, required electrical changes, settings and start-up testing. Clarify whether expanding later is possible and what work that would involve. A whole-home label alone does not establish unlimited runtime or the ability to run every appliance together.
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