Solar Financing
How Do Solar Loans Work?
Last updated: May 2026 · MySolarLoanCompanion.com/learn/
A solar loan is a fixed-rate installment loan — typically unsecured — used to purchase and install a residential solar system. You receive the funds, the installer gets paid, you own the system, and you repay the lender in fixed monthly payments over 5–25 years at APRs of 6%–36%.
Solar Loan Structure at a Glance
| Characteristic | Typical Range | Notes |
|---|
| Loan amount | $5,000–$150,000 | Most systems fall in $20,000–$35,000 range |
| APR | 6%–36% (effective rate) | See our solar loan rates guide for lender breakdown |
| Loan term | 5–25 years | 10–15 years is most common |
| Secured vs. unsecured | Mostly unsecured | No home equity or collateral required |
| Down payment | $0 required | All major solar lenders offer $0 down |
| Origination fees | $0–$500 | LightStream charges none; dealer-fee lenders embed fees in balance |
| Dealer fee (solar-specific lenders) | 0%–30% | Ask for cash price vs. financed price before signing |
| Prepayment penalty | None (most lenders) | Verify before signing |
Sources: NerdWallet solar loan guide 2026; A1SolarStore solar loan explainer April 2026; NuWatt Energy lender comparison March 2026; SurgePV financing guide
The Two Types of Solar Loans
- General-purpose personal loan — LightStream, SoFi, and credit unions offer standard personal loans that can be used for solar. No dealer fee. Transparent pricing. The APR you see is the rate you pay. Funded directly to you, then you pay the installer. Best for borrowers with 660+ credit.
- Solar-specific loan — Offered through your installer's financing partner (Mosaic, GoodLeap, Sunlight, Dividend). Convenient — one application at the installer's office. Typically includes a dealer fee of 15%–30% built into the loan balance before interest. The advertised 1.99%–3.99% rate is bought down by this fee, which is paid by the installer and added to your loan.
Key Details
- The reamortization structure is common but often undisclosed — Many solar-specific loans use lower initial payments for 12–18 months, assuming you will use a tax credit to pay down the loan balance at the end of that period. If the lump-sum payment is not made, monthly payments reset to a higher amount for the remainder of the term. With the Section 25D ITC now expired, this structure is less common but still used with state tax credits.
- Unsecured means no lien on your home — Standard solar loans do not require a second mortgage or home equity stake. Your home is not collateral. PACE loans are the exception: they are secured against the property and repaid through the property tax bill.
- The loan is funded directly to the installer — You do not receive a check. The lender transfers funds to the installer upon job completion verification. The 3-day right of rescission applies in most states — you can cancel within 3 business days of signing.
- Total financing cost varies dramatically by APR — $30,000 system at 8% APR over 15 years: total interest ~$19,800; total cost ~$49,800. At 6% APR: total interest ~$14,400. At 12% APR: total interest ~$31,500. The rate you secure has a $17,000+ impact on what you actually pay.
- Always ask for the cash price before signing — The single most important step in solar financing. Ask your installer: "What is the cash price for this system — the price if I were paying today without financing?" Compare that to the loan amount. The difference is the dealer fee.
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