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SOLAR / STORAGE CAPACITY

Solar Battery Sizing Calculator

Estimate nominal battery kWh and amp-hours from daily energy, autonomy days, usable discharge, efficiency, and bank voltage.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Operating inputs

Efficiency assumptions

Operating inputs

Preparing the calculator...

Use boundary

Calculation path

Daily demand and autonomy create usable kWh; discharge and efficiency losses increase required nominal storage.

Calculation path

Nominal kWh = daily load x autonomy days / depth of discharge / system efficiency.

What you provide

What you provide

  • Daily energy requirement: Average energy the battery must deliver each day.
  • Autonomy days: Days of battery coverage without replenishment.
  • Usable depth of discharge: Planned share of nominal capacity available before recharge.
  • Storage-system efficiency: Combined battery, wiring, and inverter delivery efficiency.
  • Nominal bank voltage: Voltage used to translate nominal watt-hours into amp-hours.

What you receive

What you receive

  • Required nominal battery kWh
  • Approximate bank amp-hours
  • Usable energy and combined fraction

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

Battery chemistry, peak current, temperature, aging, reserve, solar yield, controller limits, and code compliance need engineering review.

This is an educational planning result, not a structural, electrical, thermal, solar, battery, generator, or safety design. Confirm specifications, units, codes, and professional requirements before acting.

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