REC Solar performance guide

HJT cells combine monocrystalline silicon with a thin amorphous silicon layer, giving higher efficiency (22–23%) and a lower temperature coefficient. This means REC Alpha panels perform better in hot climates than standard PERC panels — losing less output as temperature rises.

REC panels carry a 25-year product and performance warranty and are rated to last 25–30 years. The HJT cell design has lower inherent degradation than PERC, with the Alpha series warranted to no more than 0.25% annual degradation.

REC Group is a Norwegian-founded manufacturer (now owned by TotalEnergies) with a strong reputation for quality. They consistently rank highly in independent degradation studies and have fewer warranty claims than average among premium panel manufacturers.

TwinPeak is REC's half-cut cell design used in their standard range. Splitting cells in half reduces resistive losses and improves partial-shade performance compared to full-cell panels. The Alpha HJT series uses a different approach — full HJT cells without the TwinPeak architecture.

Check for shading first — HJT cells can be sensitive to shading depending on inverter configuration. Also check your inverter; REC panels are frequently paired with SolarEdge or Enphase systems, and inverter issues are more commonly the cause of underperformance than the panels themselves.

If the system is 5+ years old or if you've noticed any panel-to-panel performance variation in your monitoring data, a thermal inspection will confirm whether any early cell degradation or delamination has occurred. Early detection protects your options for warranty claims.