Choosing an original inverter is one important thing and choosing a good battery along with the best panels is the best way for a complete solar installation.... An original inverter will not make your fan hum and will be able to withstand a thunder strike. The best solar panels so far is Monocrystaline panel with at least 6 diodes for faster and effective charge. And the best battery to go for is either India, Japan or any other battery but not China battery....