How-to
How to Compare Solar Quotes Like a Pro
🇩🇪 Diesen Artikel auf Deutsch lesenCompare quotes by price per watt, equipment model numbers, warranties and the production estimate in kWh per year — not by monthly payment. Make sure the installer is licensed, explains your utility's net metering rules and doesn't hide escalators or dealer fees in financing.
Getting three or more solar quotes is the best way to avoid overpaying. But quotes are formatted differently, so you need to bring them to a common basis.
Step by step
- Collect at least three quotes
Include at least one local installer with long-standing reviews, not only national companies.
- Calculate price per watt
Divide the total price before incentives by the system size in watts. This is the fairest comparison.
- Compare equipment
Check panel and inverter model numbers and their warranties, not just the brand.
- Verify the production estimate
Ask how it was calculated and whether shading was measured. Compare it with free online solar estimate tools.
- Understand the billing rules
The installer should explain your utility's net metering or net billing terms and what they mean for savings.
- Read the financing terms
Compare APR and total cost for loans; for leases and PPAs, check escalators and what happens when you sell your home.
- Check licenses and insurance
Confirm the contractor's license, insurance and who will actually do the installation.
Key items to compare
| Item | What to look for |
|---|---|
| Price per watt | Total price ÷ system size in watts |
| Panels | Brand, model, efficiency and degradation warranty |
| Inverter | String inverter, microinverters or optimizers; warranty length |
| Production estimate | Annual kWh based on your roof's orientation and shading |
| Workmanship warranty | Covers roof penetrations and installation errors, often 10–25 years |
| Extras | Panel upgrade, permits, monitoring, critter guards |
Check the savings claim
Run the installer's numbers through your own calculation using your real electricity rate and your utility's export credit:
Solar Panel Payback CalculatorHow many years until solar pays for itself?Try the calculator →Frequently asked questions
Are premium panels worth it?
Higher-efficiency panels help on small or partly shaded roofs. On large, sunny roofs, standard panels often deliver better value per dollar.
Should I buy, lease or sign a PPA?
Buying with cash or a low-rate loan usually saves the most over time. Leases and PPAs require no upfront cost but often save less and can complicate a home sale.