Observed arrival · 2026-09-24
GuaranteeCheck: a solar-lease shortfall checker
A diagnostic for homeowners with certain solar leases that compares guaranteed production with actual output and can prepare a claim letter.
- For
- Homeowners with Sunnova, SunPower, or PosiGen leases
- Worth noticing
- Its worked example labels the figures illustrative: 18,400 kWh guaranteed against 15,760 kWh actual, producing a sample $396 shortfall credit.
Field notes
Users enter the guaranteed production, true-up rate, and interval from a lease or PPA, then connect Enphase or upload a SolarEdge CSV. The page shows an illustrative calculation of 18,400 kWh guaranteed versus 15,760 kWh produced, yielding a sample $396 shortfall credit; it labels those figures illustrative. The site says it drafts a servicer-specific letter for the homeowner to sign and send, and charges $99 only if a shortfall is found and the letter is wanted.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
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