One-time investment, Free maintenance; System independent, Convenient installation; Solar power supply, low-carbon, safety. The performance comparison of deferent models in the same series:ModelLED lightSolar PanelControllerBatteryPole heightwire lengthCESC-R603030W100W/18V12V/10A 12V/100Ah 4m8mCESC-R604040W130W/18V12V/10A 12V/150Ah 6m12mCESC-R605050W160W/18V12V/24V/10A 12V/100Ah*27m14mCESC- ...