Quality and Performance REC is fully vertically integrated and is also on e of the world's major suppliers of solar-grade silicon. As such, rigorous quality control is applied throughout the production process, from silicon to cell to module. The -0/+5W power tolerance guarantees you the power you pay for and minimizes mismatch losses. REC PE Series modules are made with silicon refined in the U.S. using renewable energy. Their energy payback is under one year and their cell and module production processes are designed to maximize recycling and reduce environmental impact. Installation The comparatively low weight (39.6 lbs/18 kg) of the REC PE Series allows for quick and easy installation. The modules are equipped with an environmentally sealed junction box and PV Wire cables with Hosiden connectors for problem-free inter-module connection. PV Wire Output cables meet 2011 NEC requirements for use with transformerless inverters and all modules are Listed to UL 1703 for the US and Canada. Warranty The REC PE Series modules come with a 63-month workmanship warranty and a 25-year linear power guarantee that allows for no more than 0.7% degradation per year.