Two proposals can show similar monthly payments while having very different total costs. Begin by separating the project from the financing.
Put these numbers side by side
| Item | Why it matters |
|---|---|
| Cash price | The cleanest baseline for comparing project cost. |
| Financed principal | May include substantial financing costs. |
| System size | Needed to calculate cost per watt. |
| First-year production | Shows the output assumption behind savings. |
| Battery usable capacity | More useful than product name alone. |
Read the contract
California requires specific solar disclosures and home-improvement contract terms. Verify the contractor license and ensure verbal promises appear in writing.
Turn the research into a better comparison
See which companies align with your priorities before sharing contact information.
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Rules, rates, products and programs change. Verify current information with the linked official source and the final written contract.