Solar Loan Calculator

Estimate solar loan payments, financed amount, monthly payment, total interest, total loan cost, net solar cost after incentives, savings after loan payment, payback period, and solar ROI. Use this calculator to compare solar financing options before choosing a loan.

Calculate Solar Loan Payment

Monthly Loan Payment = Loan Amount × Monthly Rate ÷ (1 − (1 + Monthly Rate)−Number of Payments).
Your result will appear here.

How the solar loan calculator works

Solar loan payment mode:
The calculator estimates the loan amount from solar cost, incentives, down payment, fees, interest rate, and loan term.

Net cost mode:
The calculator subtracts credits, rebates, and down payment from gross solar cost, then estimates the amount financed.

Savings mode:
The calculator compares monthly solar savings against the monthly loan payment to estimate net monthly savings or cost.

Compare mode:
The calculator estimates total interest, total loan cost, payback period, lifetime savings, and solar ROI.

Why use a solar loan calculator?

A solar loan calculator helps estimate whether a solar loan payment may be lower than, equal to, or higher than expected monthly electric bill savings.

It can help compare financed amount, monthly payment, interest rate, loan term, total interest, net solar cost, monthly savings, net monthly savings, payback period, and ROI.

What your result means

Your result shows estimated solar loan payment, financed amount, dealer fees, closing costs, total interest, total loan cost, net cost after incentives, monthly savings, net monthly savings after payment, payback period, lifetime net savings, and solar ROI.

Solar loan formulas

Frequently asked questions

How do you calculate a solar loan payment?

Use the loan amount, interest rate, and loan term with the standard amortized loan payment formula. The calculator also includes optional dealer fees and closing costs.

Should solar incentives reduce the loan amount?

Some people use incentives or tax credits to reduce the amount financed, while others finance the full project and apply incentives later. This calculator lets you estimate the loan either way by adjusting the inputs.

What is net monthly savings?

Net monthly savings is estimated monthly solar savings minus the monthly loan payment. A positive number means savings are higher than the loan payment.

Does a longer solar loan term save money?

A longer term can lower the monthly payment, but it usually increases total interest paid over the life of the loan.

Is this solar loan calculator exact?

No. This is an estimate. Actual solar loan payments can vary based on lender terms, fees, credit approval, dealer fees, tax credit timing, prepayment rules, financing structure, and local incentive rules.