... rated power output. Main Characteristics1. High efficiency & high stability2. Monocrystalline or Polycrystalline solar cells, range from 5Wp to 290Wp3. Unique frame design ... layer back sheets to better product modules7. Output tolerance: +/-5%, cell efficiency above 16%8. Approvals: CE, IEC61215/61730, ISO, TUV9 ... control meets the highest international standard Specifications 90w PV solar panels