A 1,800 square foot home in New Hampshire typically uses about 809 kWh per month at the state average rate of 21.9¢/kWh (EIA). With 4.2 peak sun hours per day, most homeowners need a 7.7 kW solar system — roughly 20 panels at 400W. After the 30% federal ITC, net cost is about $16,200, with 8.8-year payback and $61,300+ in estimated 25-year savings.
Content roles: This page is your New Hampshire-specific sizing decision for 1,800 sq ft. For national methodology and roof/orientation depth, see the 1,800 sq ft national guide. For bill-based sizing, see $125/month (~$177/mo equivalent in New Hampshire). Policy depth: New Hampshire solar data.
⚡ System Size
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
21.9¢/kWh
16.3¢/kWh
Sun hours
4.2 h/day
4.5 h/day
System size
7.7 kW
7.2 kW
Panels (400W)
20
19
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.
Find your exact solar savings
Enter your ZIP code for a personalized estimate using your state's electricity rate and sun hours.
💰 System Cost
What Does Solar Cost for a 1,800 sq ft Home in New Hampshire After the ITC?
At $3.00/W installed (SEIA 2026), a 7.7 kW system in New Hampshire costs about $23,200 before incentives. The 30% ITC saves ~$6,960, for $16,200 net cost.
📈 Payback Period
How Long Is Solar Payback on a 1,800 sq ft Home in New Hampshire?
A 7.7 kW system saving ~$1,850/year pays back in about 8.8 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$77,500 vs $16,200 net solar — $61,300+ lifetime advantage.
Solar vs utility company · 25-year comparison
Total cost of staying on the grid vs owning solar for a $300/month bill (national average assumptions).
New Hampshire Solar Incentives for a 1,800 sq ft Home
New Hampshire’s Residential Renewable Electrical Generation Rebate Program provides rebates of up to $0.20/W (capped at $1,000) for solar PV systems. New Hampshire also has a strong net metering law and a Renewable Portfolio Standard. The NH PACE program offers financing for energy improvements.
Direct answers for US homeowners in New Hampshire.
At New Hampshire's average rate of 21.9¢/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 before incentives. The 30% federal ITC reduces net cost to about $16,200. New Hampshire's Residential Renewable Electrical Generation Rebate Program provides rebates of up to $0.20/W (capped at $1,000) for solar PV systems. New Hampshire also has a strong net metering law and a Renewable Po...
At $16,200 net cost and ~$1,850/year in bill savings, simple payback in New Hampshire is about 8.8 years.
Most New Hampshire homeowners in this size range see **$61,300+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$177** — compare the [$125/month bill guide](/guides/solar-panels-125-electric-bill/) for bill-based sizing.
The US average needs a 7.2 kW system at 11.0-year payback. New Hampshire needs 7.7 kW with 8.8-year payback at 21.9¢/kWh and 4.2 sun hours.
$125/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.