- System size: usually listed in kilowatts (kW). Make sure every quote is sized for a similar amount of expected production
- Panel model: the brand and model should be named, not just described as “premium” or “high efficiency.”
- Inverter type: whether the system uses a string inverter, microinverters, or an optimizer-based setup can affect monitoring and design flexibility
If you’re shopping for home solar, the lowest quote is not always the best deal. Solar proposals can look similar at first glance, but they often hide important differences in equipment quality, warranty coverage, financing terms, and the work included in the installation.
The goal is not to find the cheapest number on the page. It is to understand exactly what each quote includes so you can compare offers on equal terms.
→ Energy Revolution System — free, takes about 60 seconds.
That matters because solar is a long-term home investment, and small differences up front can affect performance, maintenance, and your experience after installation.
Start with the system basics
Before comparing anything else, make sure each quote clearly states the core system details. If a proposal is vague here, ask for an updated version in writing.
- System size: usually listed in kilowatts (kW). Make sure every quote is sized for a similar amount of expected production.
- Panel model: the brand and model should be named, not just described as “premium” or “high efficiency.”
- Inverter type: whether the system uses a string inverter, microinverters, or an optimizer-based setup can affect monitoring and design flexibility.
- Estimated production: this should be based on your roof, location, and shading, not a generic estimate.
We go deeper on this in our solar & energy guide — worth a read before you decide anything.
Two quotes can have the same system size but very different equipment. If one uses a less expensive panel or inverter, the headline price may not tell the whole story.
Look beyond the headline price
→ See what you could be approved for — free, takes about 60 seconds.
Solar quotes often separate costs in ways that make comparison tricky. One proposal may bundle permits, engineering, and monitoring into one price, while another lists them as extras. Ask each installer to show you what is included and what could change before work begins.
Watch for common add-ons or exclusions
- roof repairs or roof replacement
- electrical panel upgrades
- permit and interconnection fees
- monitoring hardware or apps
If a quote seems much lower than the others, check whether it leaves out a cost you are likely to face later. A transparent proposal should make the scope of work easy to understand.
Sources & further reading
This article is for general information only and is not professional financial, legal, or medical advice.
Tom Bishop — Home & Safety Editor
Tom covers home security, improvement, and energy topics, comparing options on cost, reliability, and real-world performance so homeowners can decide with confidence.
Updated August 2026