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WattSizing logo for off-grid solar and battery calculatorWattSizing

Estimates only. Verify with local codes, manufacturer specs, and a qualified installer.

How it works

  • Battery kWh added = pack size × (end % − start %).
  • Grid kWh = battery kWh ÷ charging efficiency.
  • Session cost = grid kWh × $/kWh rate.

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