Scenario: a 1,800 sq ft home. Assumes 3%/yr rate increases, 0.5%/yr panel degradation and no federal tax credit (the 30% §25D credit ended for systems installed after Dec 31, 2025). How we calculate
Data approachEIA rates · NREL sun hours · 2026 federal policy · methodology
Using floor area as a rough proxy (about 0.45 kWh per sq ft per month), a 1,800 square foot home in New Hampshire would use about 809 kWh per month — about $217/month at New Hampshire’s average residential rate of 26.79¢/kWh (EIA, Jan–Jul 2026 year-to-date). Real usage varies widely with climate, heating fuel and household size, so size your system from your actual kWh on your utility bills. With 4.2 peak sun hours per day, offsetting that usage takes about a 7.7 kW solar system — roughly 20 panels at 400W — costing about $23,200 installed. With no federal tax credit for 2026 installs and New Hampshire’s full retail net metering, simple payback is about 10.2 years, with an estimated $54,000 net over 25 years.
How Many Solar Panels for a 1,800 sq ft House in New Hampshire?
New Hampshire electricity rates and sun hours change panel count versus the US average:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For 1,800 sq ft in New Hampshire:
Estimated monthly usage: ~809 kWh
Peak sun hours: 4.2 h/day
System size:7.7 kW (~20 × 400W panels)
Metric
New Hampshire
US average
Rate
26.79¢/kWh
18.19¢/kWh
Sun hours
4.2 h/day
4.5 h/day
System size
7.7 kW
7.2 kW
Panels (400W)
20
18
New Hampshire requires a larger system than the national average for the same square footage. Use our solar system size calculator with your actual utility bills for a precise ZIP-level result.
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💰 System Cost
What Does Solar Cost for a 1,800 sq ft Home in New Hampshire in 2026?
At about $3.00/W installed (a blended 2026 US price; marketplace quotes often run lower), a 7.7 kW system in New Hampshire costs about $23,200.
The 30% federal Residential Clean Energy Credit (IRC §25D) ended for systems installed after December 31, 2025, so a solar system you buy and install in 2026 gets no federal tax credit. Leases and PPAs are different: the installer that owns the system can still claim the commercial §48E credit for systems placed in service by the end of 2027 and may pass part of that value on through a lower monthly price.
📈 Payback Period
How Long Is Solar Payback on a 1,800 sq ft Home in New Hampshire?
New Hampshire’s net metering credits most of the retail rate for small residential systems. We assume solar offsets about 87% of this home’s ~$217/month bill — roughly $2,263/year — for a simple payback of about 10.2 years.
Over 25 years, with 3% annual rate increases and 0.5%/year panel degradation, cumulative savings minus the installed cost come to about $54,000. Full retail net metering means each kWh you produce is worth close to your retail rate.
Solar vs utility company · 25-year comparison
25-year totals for a 1,800 sq ft home: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology
New Hampshire Solar Incentives for a 1,800 sq ft Home
State and local incentives: New Hampshire’s residential renewable rebate pays $0.20 per watt up to $1,000 when funding is available, and some towns offer property-tax exemptions.
Net metering: New Hampshire’s net metering credits most of the retail rate for small residential systems.
Direct answers for US homeowners in New Hampshire.
At New Hampshire's average rate of 26.79¢/kWh and 4.2 peak sun hours, a 1,800 sq ft home (~809 kWh/month) typically needs a 7.7 kW system — about 20 panels at 400W. See the [national 1,800 sq ft guide](/guides/how-many-solar-panels-1800-sq-ft/) for methodology.
A 7.7 kW system in New Hampshire costs roughly $23,200 installed. The 30% federal tax credit (25D) ended for systems installed after December 31, 2025, so there is no federal credit for a system you buy in 2026. New Hampshire's residential renewable rebate pays $0.20 per watt up to $1,000 when funding is available, and some towns offer property-tax exemptions.
At $23,200 installed and ~$2,263/year in bill savings, simple payback in New Hampshire is about 10.2 years. New Hampshire's net metering credits most of the retail rate for small residential systems.
With about 10.2-year payback and ~$54,000 estimated 25-year net savings, it is a reasonable case in 2026. Equivalent monthly bill: **~$217** — compare the [$150/month bill guide](/guides/solar-panels-150-month-bill/) for bill-based sizing.
The US average needs a 7.2 kW system at 16.3-year payback. New Hampshire needs 7.7 kW with 10.2-year payback at 26.79¢/kWh and 4.2 sun hours.
$150/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.
26.79¢/kWh — New Hampshire average residential price. Source: EIA Electric Power Monthly, Table 5.6.B (year-to-date through July 2026), residential average retail price (July 2026) (EIA)
Solar production
4.2 peak sun hours/day × 0.82 system derate. Approximate state-average daily solar resource (peak sun hours) based on NREL solar resource data (NSRDB); not location-specific — use NREL PVWatts for an address-level estimate. (NREL PVWatts)
Installed price
$3.00 per watt before incentives. Blended 2026 US residential installed price used by this site; EnergySage marketplace reported about $2.60/W (mid-2026); full-market medians are higher.
Federal tax credit
$0 for homeowner-owned systems installed in 2026 — the 30% §25D credit ended Dec 31, 2025 (IRS)
Net metering
Full retail net metering — solar assumed to offset 87% of the bill. New Hampshire's net metering credits most of the retail rate for small residential systems.
Square footage
Used only as a rough usage proxy: 1,800 sq ft × 0.4495 kWh/sq ft/month. EIA: average US residential customer used about 899 kWh/month (2022). Site assumption: that usage corresponds to a ~2,000 sq ft home (0.45 kWh per sq ft per month). Square footage is only a rough proxy — size from your actual kWh.
Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.