Solar panels and panel brands

Where Do Home Solar Panel Warranties Actually Differ?

Published · By the SolarPanelX editors · Prices and specs as of that date, from the pages under Sources

Summary

Less in the headline years than in what is covered and what it takes to extend it. The REC Alpha Pure-RX has a 20-year product warranty as standard, which becomes 25 years, plus a 25-year labor warranty, when an REC-certified installer puts the panels in and registers them. The Qcells Q.TRON BLK M-G2+ carries 25 years on both product and performance, and its datasheet says nothing about labor. In year 25, REC guarantees 92% of nameplate power and Qcells 90.58%.

Two datasheets side by side

REC Alpha Pure-RX, standardREC Alpha Pure-RX, ProTrust under 25 kWQcells Q.TRON BLK M-G2+
Product warranty20 years25 years25 years
Performance warranty25 years25 years25 years
Labor warranty0 years25 yearsnot stated in the datasheet
Power in year 198%98%at least 98.5%
Annual degradation0.25%0.25%max. 0.33%
Power in year 2592%92%at least 90.58%

REC ProTrust has two conditions: the panels were installed by an REC Certified Solar Professional, and that installer registered them with REC. For systems from 25 to 500 kW, the labor term drops to 10 years; a 10 kW home system falls in the under-25 kW column.

The Qcells datasheet only says full warranties follow the terms of the Qcells sales organization in each country. It does not mention registration, or who pays to pull and replace a failed panel. Qcells' U.S. FAQ says its modules carry a 12- or 25-year product warranty and a 25- or 30-year linear performance warranty depending on the product, and tells owners to contact their local authorized installer if problems arise.

Year 25 on a 400 W panel

Applied to a 400 W panel, the floor in year 25 is 368 W under REC's terms and about 362 W under Qcells'. That gap of roughly 6 W per panel adds up to about 115 W across a 20-panel roof. The labor warranty decides something else: whether the owner pays for the labor to remove and reinstall a panel when one on that roof fails.

Sources

  1. REC Group — REC Alpha Pure-RX datasheet (US)
  2. REC Group — REC Alpha Pure-RX
  3. Qcells — Q.TRON BLK M-G2+ series datasheet (420-440 Wp, Rev02, 2026-04)
  4. Qcells North America — FAQ

We have not tested these products. Specs, prices, stock and terms are as published on these pages on the date above and can change; check the manufacturer or retailer before you buy.

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