1,TUV,UL,CE,ISO CERTIFICATE 2,OVER 30 YEARS LIFE 3,WORKING VOLTAGE: 36V 4,WORKING ... install--- only connect the bacles during the installation. The power supply box is integration ( include the battery, the solar charge ... maintenance -free, deep cycle battery give safe and reliable power supply 4 Be Provides with reliability, safety and flexibility. We ... 10 hrs/days ,2-3 rainy days 30 watt solar system