YLM 72 Cell Series Module Type Choosing the best P-type monocrystalline cells, YLM series modules are making the best out of your system. Trust in the expertise of Yingli and well proven technology. High conversion efficiency and more power output per square meter. Durable PV modules, independently tested for harsh environmental conditions such as exposure to salt mist, ammonia and known PID risk factors. Our high-transmission glass features a unique anti-reflective coating that directs more light on the solar cells, resulting in a higher energy yield. Tested in accordance to the standard IEC 62804, our PV modules have demonstrated resistance against PID (Potential Induced Degradation), which translates to security for your investment.