Solar panel: 5W 18V Rechargeable battery:12V/24AH with 4 pcs DC 12V Material: ... efficiency:over 16% (2)Solar panel: 5W 18V (3)Rechargeable battery:12V/24AH with 4 pcs DC 12V ouput ... port and solar input port (4)4led indicates battery capacity of 25%,50%,75%,100%;one solar led ... computer chip to take smaples of the battery voltage,panel battery voltage,discharge current temperature and other parameters. ...