... , light weight, small size,power, high conversion,pure sin wave AC 220V output;3.The power supply system uses microcomputer automatic circuit ... itemMaterial instructionParameter instructionLife time1Solar moduleImported polycrystalline silicon cell20WP25years2500WDC/AC converterPure sine waveDC 12V AC 220V25years3Storage batteryMaintenance-free lead-acid battery12V/40AH ...