Solar Equipment

Panels, inverters, and the three separate warranties behind them, plus what a roof's remaining life does to the arithmetic.

Solar Equipment August 22, 2026 Your Solar Warranty Is Three Documents, Not One The line that says 25-year warranty is three contracts signed by two companies. What each one pays for, and where each one lands when the installer folds. 16 min read

About this section

Three quotes for the same roof came back with three different payback figures — seven years, nine, and fourteen. Priya Raghunathan rebuilt all three in a spreadsheet to find where they diverged, and the spreadsheet turned into this site. She does not work in the energy industry and has never sold, financed, or installed a system. Every number here is traced to a utility tariff sheet, a regulator's decision, or a published standard, and the arithmetic is written out so you can redo it on your own bill.

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