... ,life span=25yearsVoltage: 12v 3.Light source: 5-20w electrodeless lamp,LED and so on,life span=50000h4.Battery:38-120AH,Highly ... effective reliably Non-maintaining lead-Acid battery,life span=5-8years5.Controller: Micro ... control,life span=5years6.Working temperature: -20°c----55°c.7.Working time: 8-10 hours per day,can continue working ...