Global Solar has developed a proprietary process for manufacturing thin film Copper Indium Gallium diSelenide (CIGS) solar panels. CIGS solar panels create more electricity from the same amount of sunlight than other thin film solar panel technologies. Thus they deliver higher conversion efficiency. CIGS conversion efficiency is also very stable over time, meaning it has no light induced degradation. CIGS technology is superior under low light level conditions. The operating voltage of these solar panels is designed for charging 12 and 24 volt lead acid batteries. Junction box has wires with Multi Contact cables. The 6 and 12 watt solar panels (GSE 6 and GSE 12) have a 1 year warranty. The larger solar panels have a 25 year warranty.