... style design,simple operation ,easy maintenance .2.low self-wastage power ,low heating value,high conversion efficiency.3.collection of complete ... Our warranty policy and our after-sale solution: The solar power system is composed of 4 parts, solar panel, battery, ... ROHS, SGS, ISO9001:2008 certifications, and we are applying the UL certification in 2012. The warranty period: 1) Solar panel: 1 ...