State
How much solar do I need in Washington?
Washington averages 3.95 peak sun hours a day, so 1 kW of panels makes about 1,088 kWh a year. A home using 10 kWh a day needs about 3,376 W of panels.
| Daily use | Panel watts | 400 W panels | Battery for 1 day |
|---|---|---|---|
| 5 kWh/day | 1,688 W | 5 | 6.17 kWh |
| 10 kWh/day | 3,376 W | 9 | 12.35 kWh |
| 20 kWh/day | 6,751 W | 17 | 24.69 kWh |
| 30 kWh/day | 10,127 W | 26 | 37.04 kWh |
Peak sun hours: 3.95; annual output 1,088 kWh per kW. Source: state table derived from NREL PVWatts v8; check your exact address in NREL PVWatts.
Questions
How many peak sun hours does Washington get?
3.95 kWh/m²/day on average, from NREL PVWatts v8 data.
How many solar panels for a house in Washington?
Washington averages 3.95 peak sun hours a day, so 1 kW of panels makes about 1,088 kWh a year. A home using 10 kWh a day needs about 3,376 W of panels.