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Red flags in a solar quote
Tick what you see in the quote you have. Each flag says why it matters and what to ask the installer, and the tool tells you whether you can sign, should ask first or should get other quotes. The checks come from the ERSE, ADENE and DGEG rules and from published prices.
How it works
Each flag has a weight. High flags are things a quote must state before you can compare it or know it follows the rules. Medium flags are worth an answer in writing. Low flags are details to tidy up.
One high flag, or three medium ones, means do not sign yet: ask the questions and get the answers in writing. Three or more high flags means the quote cannot be compared, so get other quotes. Nothing you tick leaves your browser.
Sources
- ERSE, self consumption FAQ (FAQ do regime de autoconsumo), May 2025 (duties of the owner and the installer)
- ADENE and DGEG, practical guide to individual self consumption, chapter I (panel efficiency about 22%, power warranty 97% in year one and 80% at 25 years, inverters, registration)
- PVGIS, European Commission Joint Research Centre (yields per municipality, 1 kWp, 35° tilt, 14% losses, SARAH2 data for 2005 to 2020)
- Proposal to amend the 2026 State Budget (PS, 7 November 2025): the 6% VAT rate on panels ended on 30 June 2025
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