MPPT (Maximum Power Point Tracking)Solar Charge Controller offer an efficient, safe, multi-stage recharging process that prolongs battery life and assures peak performance from a solar array. Each Charge Controller allows customized battery recharging. LCD display , easy to operate on LCD screen Multi stage charging (3-stage charging , parallel charging and equalized charging function) BTS - Battery remote temperature sensor terminalEnable to charge Li-thium, Gel , lead-acid battery With RS485 & USB communication port Protection: PV array short circuit, PV reverse polarity, Battery reverse polarity, Over charging, Output short circuit