Balcony solar in Nashua
800 W of panels on a south-facing balcony railing in Nashua produce about 750 kWh a year and save about $105.
Output by orientation and mounting
Yearly output with 800 W of panels and the inverter limited to 800 W.
| Panels face | On the railing (vertical) | Tilted at 30° |
|---|---|---|
| East | 530 kWh | 850 kWh |
| South-east | 700 kWh | 1,010 kWh |
| South | 750 kWh | 1,060 kWh |
| South-west | 680 kWh | 1,000 kWh |
| West | 510 kWh | 840 kWh |
Output by month
Show as a table
| Month | Railing (vertical) | Tilted at 30° |
|---|---|---|
| Jan | 80 kWh | 71 kWh |
| Feb | 71 kWh | 73 kWh |
| Mar | 73 kWh | 96 kWh |
| Apr | 62 kWh | 110 kWh |
| May | 48 kWh | 100 kWh |
| Jun | 43 kWh | 100 kWh |
| Jul | 47 kWh | 110 kWh |
| Aug | 57 kWh | 110 kWh |
| Sep | 64 kWh | 93 kWh |
| Oct | 66 kWh | 75 kWh |
| Nov | 76 kWh | 70 kWh |
| Dec | 60 kWh | 52 kWh |
Savings and payback
At $0.2701 per kWh you save about $105 in the first year. A kit costing $1,300 pays back in about 12.4 years.
- Electricity price: $0.2701 per kWh (U.S. Energy Information Administration, 2025-09..2026-08). Source
- Assumes a constant base load of 150 W, so 52% of the output is used at home.
- Power sent to the grid is not paid for.
Rules
New Hampshire
Takes effect on January 1, 2027
Up to 1,200 W of inverter output per meter.
- Certified by a nationally recognized testing laboratory to the national safety standards for distributed energy resources and plug-in solar systems.
- Your utility may ask you to register the kit.
Last verified: October 31, 2026
Nearby cities
- Manchester 740 kWh a year · 16 mi
Data sources
- Solar data: PVGIS-NSRDB, PVGIS 5.2, 2011–2015.
- Electricity price: U.S. Energy Information Administration, 2025-09..2026-08.
- Last verified: October 31, 2026
- How we calculate