Solar Panel Calculator (How Many Panels Do I Need?)
calc_solar_panelRead-only
Panels needed to offset annual electricity use, from panel wattage, peak sun hours and system losses. Formula: Annual kWh per panel = W/1000 × peak sun hours × 365 × (1 − losses). Panels = ⌈annual use ÷ kWh per panel⌉.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| annual_kwh | No | Annual usage (from your bills) (kWh); default 12000 | |
| panel_watts | No | Panel rating (W); default 400 | |
| peak_sun_hours | No | Peak sun hours/day (look up in PVWatts) (h); default 5 | |
| system_losses_pct | No | System losses (%); default 14 |