... solar panel ,battery) 2)CE,EMC,IEC,ROHS, 15w solar power system for home used APPLICATION:1) 12V DC ... 50Hz/60Hz can be selected on the inverter's module.Other output voltage and frequency also can be customized. ... changed regularly in about 3 years3) Controller:the intelligent module, can last for more than 5-10 years under ... us. http://www.gzfet.com/en/Default.asp 15w solar power system for home used