REC Alpha Pure-RX

The REC Alpha Pure-RX 460W carries a temperature coefficient of -0.24%/°C. In practical terms, this means that for every degree Celsius above 25°C (77°F) — the standard test condition temperature — the panel loses 0.24% of its rated output. On a 95°F summer day in Massachusetts, with roof surface temperatures reaching 60°C, a panel's output drops by approximately 8.4%. A lower (less negative) temperature coefficient is better. At -0.24%/°C, the REC Alpha has one of the best temperature coefficients available, meaning it retains more power on hot days than most competitors.

The REC Alpha Pure-RX 460W uses 132 half-cut cells, which improves shade tolerance compared to traditional full-cell designs. When a shadow falls across part of the panel, half-cut cell architecture limits the impact to only the affected string of cells, allowing the unshaded portions to continue producing near full power. This matters for rooftops with intermittent shading from trees, chimneys, vents, or neighboring structures.

Over the 25-year performance warranty period, the REC Alpha Pure-RX 460W guarantees at least 98.5% output in year one, degrading linearly to 92% by year 25. The annual degradation rate works out to approximately 0.27% per year — a figure that directly affects your lifetime energy production and savings. This is an exceptionally low degradation rate, among the best in the residential solar market.