Calculator Inputs
Example Data Table
| Scenario | Monthly Use | Offset | Cost Per Watt | Battery Cost | Estimated Use Case |
|---|---|---|---|---|---|
| Small Home | 550 kWh | 85% | $3.05 | $0 | Lower bill reduction project |
| Average Home | 850 kWh | 90% | $3.15 | $0 | Balanced grid tied system |
| Backup Ready | 1,050 kWh | 100% | $3.25 | $12,000 | Solar plus battery planning |
Formula Used
Monthly kWh = Monthly bill ÷ electric rate, unless monthly kWh is entered.
Annual kWh = Monthly kWh × 12.
Target production = Annual kWh × usage offset percentage.
System size = Target production ÷ peak sun hours ÷ 365 ÷ performance ratio.
Panel count = Ceiling of system watts ÷ panel watts.
Gross cost = System watts × cost per watt + fixed costs + permit fees + roof work + battery cost.
Net cost = Gross cost − federal credit − NH rebate − utility rebate.
Payback = Net cost ÷ annual net savings.
How To Use This Calculator
- Enter your average monthly electric bill and electric rate.
- Add monthly kWh if your utility bill shows exact usage.
- Choose your target usage offset.
- Enter local sun hours, system loss, and panel wattage.
- Add installed cost, permit cost, roof work, and battery cost.
- Enter current credit, rebate, and export credit assumptions.
- Add loan terms if you plan to finance the project.
- Press calculate and review cost, savings, payback, and loan output.
Solar Panel Cost Planning For New Hampshire
Why Solar Cost Planning Matters
A New Hampshire solar quote can look simple at first. Yet the final cost depends on many moving parts. Roof condition, panel wattage, labor, permits, battery storage, and utility credits all change the budget. This calculator keeps those items visible. It helps you compare a cash purchase, a financed project, and a battery upgrade in one place.
New Hampshire Project Factors
Solar production in New Hampshire is shaped by local sunlight, roof angle, shade, snow, and seasonal use. A home using more winter electricity may need a larger system. A home with strong summer air conditioning may value net metering more. The calculator lets you enter your own sun hours, electric rate, and export credit. That makes the result more flexible than a fixed estimate.
How The Estimate Works
The tool first estimates annual electricity use from your bill and rate. You may also enter monthly kWh directly. It then sizes the solar array for your selected usage offset. The panel count is rounded upward, so the final system may produce slightly more than the target. Gross cost is built from watt cost, fixed project costs, permitting, roof work, and battery price.
Savings And Payback
Savings come from avoided grid purchases and exported energy credits. Annual maintenance is subtracted to show a cleaner savings estimate. The payback period divides net cost by yearly net savings. A short payback can look attractive, but cash flow also matters. The loan section estimates monthly payment, total interest, and first year monthly benefit.
Use Results Carefully
This page is for planning. It does not replace a site survey. Actual quotes may change after roof inspection, interconnection review, shading study, or utility approval. Incentive rules can also change. Use current rebate details from your installer, tax professional, or utility. Then run the calculator again. A good estimate should show both the installed price and the long term value.
Compare Proposals Fairly
When comparing proposals, keep the same inputs for every option. Match the system size, warranty term, battery capacity, financing term, and included roof work. This makes differences easier to see. Higher prices are not always worse. Better equipment, stronger workmanship, and lower finance costs may improve value over time for homeowners nearby.
FAQs
What does this New Hampshire solar cost calculator estimate?
It estimates system size, panel count, gross cost, incentives, net cost, savings, payback, loan payment, and long term value using your own inputs.
Can I use my exact utility usage?
Yes. Enter monthly kWh from your bill. If you leave it at zero, the calculator estimates usage from monthly bill and electric rate.
Does the calculator include NH incentives?
It includes fields for NH rebates, grants, and utility rebates. Enter current amounts from your installer, utility, or program documents.
Why is the panel count rounded upward?
Solar systems use whole panels. Rounding upward helps meet the target production after converting the calculated array size into real panel count.
What is system loss?
System loss covers inverter loss, wiring loss, shade, dust, temperature effects, mismatch, and other production reductions. Many estimates use a loss assumption.
Can I include battery storage?
Yes. Add the battery price in the battery cost field. The result includes it in gross cost and incentive calculations.
Is simple payback the same as loan cash flow?
No. Simple payback compares net cost with yearly savings. Loan cash flow also subtracts the estimated monthly loan payment.
Should this replace a professional quote?
No. Use it for planning only. Final pricing needs roof review, electrical review, shading analysis, incentive confirmation, and installer proposal details.