How to Compare Solar Quotes: A 5-Step Comparison Checklist

Disclaimer: This article is informational, not legal advice.

Overview

Getting multiple quotes is the golden rule of buying solar panels. However, comparing these quotes can feel like comparing apples to oranges. Different salespeople use different metrics, financing models, and production estimates, making it incredibly difficult to determine which offer is actually the best. This guide breaks down exactly how to compare solar quotes side-by-side, helping you identify true value and spot deceptive red flags before you sign a contract.

Key Points

• Always compare the cash price and the cost per watt, not just the monthly payment.
• Scrutinize system size and production estimates; some companies artificially inflate them to make their deal look better.
• Understand financing costs and hidden dealer fees that can increase your total cost by 30%.

1. Compare the Cost Per Watt

The most objective way to compare the price of different solar proposals is by calculating the gross cost per watt. This levels the playing field regardless of the system size being proposed.

To calculate this, take the total cash price of the system (before any tax credits or incentives are applied) and divide it by the total wattage of the system. For example, a $20,000 system that produces 8 kilowatts (8,000 watts) costs $2.50 per watt. Legitimate quotes usually fall between $2.50 and $3.50 per watt. If a quote is wildly outside this range, you should be extremely skeptical.

2. Analyze System Size and Production Estimates

Not all solar panels are created equal, and not all roofs get the same amount of sun. Look closely at the proposed system size (measured in kW) and the estimated annual production (measured in kWh).

Some unethical salespeople will manipulate the software to overestimate how much sunlight your roof gets, making their system look like a better investment. Compare the production estimates across all your quotes. If one company promises 30% more power from a system of the same size, they are likely lying to close the sale.

3. Uncover Hidden Dealer Fees

If you are financing your solar system, comparing monthly payments is not enough. You must look at the loan terms, specifically the interest rate and the dealer fees.

Many solar lenders offer incredibly low interest rates (like 1.99%), but they offset this by charging the installer an upfront "dealer fee." The installer simply adds this fee to your total loan amount. These fees can range from 15% to over 30% of the total system cost. Always ask the installer to provide both the "cash price" and the "financed price." The difference between the two is the hidden dealer fee.

4. Evaluate Warranty Terms

A solid warranty protects your investment for decades. When comparing quotes, look for three specific types of warranties:

• Equipment Warranty Covers defects in the panels and inverters (usually 10-25 years).
• Workmanship Warranty Covers the actual installation labor and roof penetrations (usually 5-10 years, though some offer 25).
• Performance Guarantee Guarantees the panels will produce a specific percentage of their rated power over time.

Ensure the warranties are backed by the manufacturer, not just the local installer, in case the installer goes out of business.

5. Review the Quality of Equipment

Finally, compare the actual hardware being proposed. A cheaper quote might be utilizing outdated, low-efficiency panels or string inverters instead of microinverters. Research the specific panel and inverter brands listed in the quote. Legitimate installers will clearly itemize this equipment, while scammers will use vague language like "Tier 1 high-efficiency panels" without specifying the brand.

What To Do Next

Once you have your quotes, use our how to choose a solar installer guide to verify the credentials of the companies you are considering. Take your time, ask questions, and never let a salesperson pressure you into signing immediately.

FAQ

Why are the monthly payments so different on similar sized systems?

Different financing options have different term lengths, interest rates, and dealer fees. A 25-year loan will have lower monthly payments than a 10-year loan, but you will pay significantly more in interest overall.

Is the cheapest solar quote always the worst?

Not always, but extremely low quotes often indicate corner-cutting on equipment quality, labor, or missing necessary electrical upgrades. If a deal seems too good to be true, it usually is.

Should I pay cash or finance my solar system?

Paying cash is always the cheapest option overall because it avoids interest and dealer fees. However, if you must finance, seek out local credit unions or HELOCs, which often have better terms than specialized solar lenders.

Sources

• Solar Energy Industries Association (SEIA)
• Consumer Financial Protection Bureau (CFPB)
• Department of Energy - Homeowner’s Guide to Going Solar

Related Resources

• Read our overarching guide on solar panel scams and deceptive sales.