A Sunlight Financial solar loan is the most common way a U.S. homeowner finances rooftop solar. The loan covers the system, the inverter, the labor, and (often) the dealer fee, paid out to your installer in milestones as your project moves from contract to Permission to Operate. Here’s the structure underneath the sales pitch.
What a Sunlight solar loan covers
- Solar panels and racking
- Inverter (string or microinverter)
- Installation labor and permitting
- Optional battery storage (Tesla Powerwall, Enphase IQ Battery, FranklinWH, etc.)
- Roofing work when bundled with the solar install (limited scope)
- Dealer fee — included in the financed price, not as a line item
Loan structures: re-amortizing vs. fixed-payment
Most Sunlight solar loans are re-amortizing. That means your monthly payment is calculated assuming you’ll apply roughly 30% of the loan principal as a lump-sum payment within the first 18 months — money you’d typically get from the federal solar Investment Tax Credit (ITC). If you make that lump payment, your monthly stays low. If you don’t, the loan re-amortizes and your monthly jumps, sometimes by 30%–50%.
Fixed-payment solar loans don’t re-amortize. The monthly stays the same whether or not you apply the tax credit. They have slightly higher initial payments but predictable cash flow.
APR tiers and what they mean
Sunlight Financial’s published APR range is 0.00% to 6.99% on standard solar loans, with a separate 30-year tier at 1.99%, 2.99%, or 3.99%. The tier you’re offered depends on:
- Your credit score. 720+ generally qualifies for the best tier; 650–720 is mid-tier; below 650 is typically declined.
- The dealer fee. The contractor chooses how much dealer fee to absorb. A higher dealer fee buys a lower APR for you — but inflates the financed principal.
- The capital provider. Different banks back different loan programs and apply slightly different underwriting overlays.
Term lengths
Sunlight offers solar loan terms from 3 months to 30 years. The most common are:
- 10 years — Lower lifetime interest, higher monthly. Best if you want to pay it off fast.
- 15 years — A balanced middle ground.
- 20 years — Most-quoted term; manageable monthly, moderate lifetime interest.
- 25 years — Stretches payments over panel warranty period; significant lifetime interest.
- 30 years — Lowest monthly payment available; introduced in 2022 at 1.99%/2.99%/3.99% APR.
The dealer-fee math
The single most important number on a Sunlight loan quote isn’t the APR — it’s the dealer fee. Dealer fees on Sunlight loans typically range from $0 (rare, only on the highest-APR tier) to about $5.00 per watt of system capacity. On a 10-kW system, that’s up to $50,000 added to your financed principal.
Why does the dealer fee exist? Because the promotional APR (0.00% to 1.99%) is below the bank’s cost of capital. The dealer fee is the difference, paid by the contractor and folded into your loan. The contractor recoups it from the system price quoted to you.
Federal tax credit and the lump-sum payment
The federal solar Investment Tax Credit (ITC) gives qualifying homeowners a tax credit of 30% of the system cost, claimed on your federal return for the year of installation. On a $35,000 system, that’s a $10,500 credit — but only if you owe at least that much in federal tax.
On a re-amortizing Sunlight loan, the loan terms assume you’ll apply that $10,500 as a lump-sum payment within 18 months. If you don’t, the loan re-calculates over the remaining term at the higher principal, and your monthly payment jumps. Confirm with a CPA that you can actually use the credit before committing to a re-amortizing loan.
How Sunlight solar loans compare
| Lender | Min FICO | APR | Loan size | Re-amortizing? |
|---|---|---|---|---|
| Sunlight Financial | 650 | 0.00%–6.99% | $10K–$100K | Yes (most products) |
| GoodLeap | 640 | 0.99%–7.99% | $10K–$90K | Yes |
| Mosaic | 700 | 1.49%–8.99% | $15K–$100K | Some products |
| Dividend Finance | 700 | 2.99%–9.99% | $10K–$100K | Yes |
Should you take a Sunlight solar loan?
A Sunlight Financial solar loan can be the right choice if:
- Your credit is 700+ and you qualify for sub-3% APR tiers
- You have federal tax liability sufficient to use the ITC in year one
- You’re planning to stay in the home for at least 7–10 years
- Your installer is transparent about the dealer fee in dollars
Consider alternatives if:
- You have a HELOC available at a lower rate (often the cheapest solar financing route)
- You can’t use the federal tax credit — a fixed-payment loan or lease is safer
- You’re likely to sell within 5 years
- Your credit score is under 650