Solarÿcontrollerÿisÿcontrolÿdeviceÿwhichÿcanÿcontrolÿsolarÿpanelÿandÿtransformÿsolarÿenergyÿintoÿelectricityÿthenÿstoreÿtoÿtheÿbatteryÿbank.ÿSolarÿcontrollerÿisÿtheÿmostÿimportantÿpartÿinÿoff-gridÿsystem,ÿwhoseÿperformanceÿhasÿmuchÿeffectÿonÿlifeÿexpectancyÿandÿoperationÿofÿtheÿwholeÿsystem,ÿespeciallyÿtheÿbatteryÿexpectancy.ÿOrÿbatteryÿserviceÿlifeÿwillÿbeÿshortenedÿbyÿoverÿchargeÿorÿoverÿdischarge.