silan solar high mast light These used lights are powered by solar. It automatically turns on at night, turns off in the morning. It is charged with sunlight. It is maintenance free. It has a lithium battery. Its efficiency is much higher than a normal battery. The life cycle of a lithium battery is 2000. This light uses a MPPT charge controller. Which charges the battery properly .It has a solar panel with high efficiency which provides 25 years of continuous electricity. ...