Solar panel and battery calculator

  1. Input
  2. Result

Input

Consumption and autonomy

W
h
days

Solar array

W

Battery configuration

Ah
%
Losses and reserve
%
%
%
%
Illustrative energy balanceSun presets are illustrative peak-sun hours, not measured local weather or daylight duration. Use seasonal data for your location, especially the worst month. The comparison changes sun hours only. Batteries must be electrically compatible and approved for series or parallel use. MPPT voltage limits and charging current need a separate check.

Solar panel, battery and controller sizing calculator

The calculator estimates daily energy use, required PV array wattage, battery capacity and controller current with a selected reserve margin.

Use the result as a planning estimate, then verify local climate, shading, cable losses and equipment datasheets before installation.

Quick start

Size solar panels and battery energy with clear sun-hour assumptions.

  1. Enter daily consumption and autonomy
  2. Set panels, battery configuration and losses
  3. Calculate and compare low- and high-sun scenarios
✓ Use the calculator to turn input values into a clear, repeatable result.
✓ Keep units and assumptions visible so the calculation can be checked later.
✓ Copy the result or key numbers for reports, messages or spreadsheets.
✓ Reset to defaults when you want to compare another scenario from a clean state.
✓ Calculators run in the browser and are useful for quick estimates before formal checks.
✓ For finance, health, engineering or legal decisions, verify important results with a specialist or official source.

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