Solar Panels Needed
Annual Usage (kWh)
Peak Sun Hours/Day
Panel Wattage (W)
✓Solar Requirements
Panels Needed
7
System Size (kW)
2.80
A solar panel number calculator estimates how many panels are needed based on annual electricity usage, local peak sun hours, and individual panel wattage.
- 1Annual generation per panel (kWh) = Wattage × Sun hours/day × 365 / 1,000
- 2Panels needed = Annual usage / Annual generation per panel
- 3UK average: 2.5–3.5 peak sun hours/day
- 4Add 15–20% for inverter losses and shading
3,500 kWh/yr, 3 sun hours/day, 400W panels=Per panel: 438 kWh/yr; Panels needed = 3500/438 ≈ 8 panels
| Annual usage | System size | Panels (400W) | Roof area |
|---|---|---|---|
| 2,500 kWh | 2 kW | 5 panels | ~12m² |
| 3,500 kWh | 3 kW | 8 panels | ~20m² |
| 5,000 kWh | 4 kW | 10 panels | ~25m² |
References
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