What Should Solar Cost?

Solar quotes are hard to compare because no two are for quite the same thing. Converting every one to cost per watt fixes that in about ten seconds.

Why per-watt is the only fair comparison

Installers quote different system sizes, different panel counts, and different equipment. A $19,000 proposal is not cheaper than a $24,000 one if it is for a system two-thirds the size — you would simply be buying less solar. Per-watt normalizes all of that, and it is the number the industry itself uses internally.

Once you have it, the rest of the comparison is about what you are getting for that price: equipment, warranties, and whether financing costs are hiding inside it.

What actually drives the price

• Sales and financing costs. Often the largest single differentiator between quotes, and the least visible. Dealer fees on low-APR loans commonly add 15–30% — see how to read a solar quote.
• Roof complexity. Multiple planes, steep pitch, tile or slate, or a required electrical panel upgrade all add real labor and material cost.
• Equipment tier. Premium panels and microinverters cost more. Sometimes justified, often oversold.
• Permitting and local requirements. Vary enormously by jurisdiction; some areas add thousands in soft costs.
• System size. Larger systems are usually cheaper per watt — fixed costs spread across more capacity.

How to tell if a quote is inflated

1. Get three itemized quotes for a comparable system size in your market. This is the whole method — local spread beats any national average.
2. Convert each to cost per watt. One quote far above the others is the signal.
3. Ask each for the cash price. A financed price above the cash price is a dealer fee, and it is the most common reason a quote is high.
4. Check what you get for the premium. If the expensive quote has better equipment and a longer workmanship warranty, it may be worth it. If it is identical hardware, it is sales cost.
5. Run each through the Solar Payback Calculator at your real electricity rate. Price only matters through its effect on payback.

Price is not the same as value

The cheapest quote is not automatically the best. Installer quality shows up years later, when something fails and you need the workmanship warranty honored by a company that still exists. A modest premium for an established local installer with a strong warranty is often money well spent.

What is rarely worth paying for is a large premium that buys neither better equipment nor better warranty coverage — just a bigger sales operation. That is precisely what the per-watt comparison exposes.

Then check the economics, not just the price

A fair price on a system that does not pay back is still a bad deal. Work out what size you need with the System Size Calculator, check payback in your state, and if you are financing, compare it honestly against paying cash in the Solar Loan vs Cash Calculator.

General information, not financial advice. Prices vary substantially by market, equipment, and installer — figures used here are illustrative, and you should rely on your own quotes.

Frequently asked questions