Solar calculator for New Hampshire
Panels, system size, cost and payback for New Hampshire, from your own power bill.
The average New Hampshire home uses 619 kWh a month and pays 23.4 cents per kWh, which puts New Hampshire at above-average electricity prices, which helps solar savings. Winter heating shapes the bill in New Hampshire, and winter is when panels make the least, so a bill that looks big in January does not map cleanly to a bigger array. A south-facing fixed array there makes about 1,258 kWh per installed kW a year, and the worst winter month still gets 2.52 peak sun hours a day. Drop in your own bill below and the numbers on this page are replaced by yours.
A worked example for New Hampshire
Take the average home: 619 kWh a month, which is 7,428 kWh a year, at 23.4 cents per kWh (EIA, 2024 residential averages, as of 2026-11). Sized to cover all of that use, the tool returns 5.9 kWdc and 15 panels, needing about 315 square feet of roof. The installed estimate is $14,702 (national median, EnergySage H2 2025), yearly savings are about $1,738, and simple payback is 8.5 years, with no incentive applied.
Sun and yield in New Hampshire
We use 1,258 kWh per installed kW per year for New Hampshire, from NREL PVWatts v8 for the state's largest city at a 20 degree south-facing tilt (via TheGreenWatt, as of 2026-11). The darkest month averages 2.52 peak sun hours a day, which matters if you plan to go off-grid or size a battery. A different roof angle or heavy shade changes this, so treat it as a starting point.
Incentives
The 30% federal tax credit ended for homeowner purchases after December 31, 2025, so none is applied here. See the tax credit guide. Look up New Hampshire and your own utility for net metering terms and any local programs before relying on a payback number.
Planning estimate. Permits, interconnection approval and a licensed electrician are required for grid-tied systems.
Questions
How many solar panels does a New Hampshire home need?
The average New Hampshire home uses 7,428 kWh a year (EIA 2024). At about 1,258 kWh per installed kW, covering all of it takes 5.9 kWdc, or 15 panels. Your own bill will move that up or down.
How much does solar cost in New Hampshire?
For the average-home example the installed estimate is $14,702 at the national median of $2.49 per watt (EnergySage, H2 2025, as of 2026-11). We have no sourced New Hampshire price multiplier, so local quotes will differ.
Is there a federal solar tax credit in New Hampshire?
The 30% federal tax credit ended for homeowner purchases after December 31, 2025. Check your state, utility and local programs separately.
Where does the New Hampshire sun figure come from?
1,258 kWh per kW per year and 2.52 winter peak sun hours come from NREL PVWatts v8 runs for New Hampshire's largest city, compiled by TheGreenWatt (as of 2026-11). Real yield varies across the state.
Is my bill uploaded?
No. Your bill is read in your browser and never uploaded.