FEATURES ***NOTE: If the auxiliary battery is connected, please hold down for 3 seconds to select the battery type. Dual Input: This Charger is designed to effectively pull power from solar panel (up to 20A) or vehicle’s alternator to charge your auxiliary battery. Smart Alternator Compatible: The ACC wire can be wired to the ignition to adjust voltage cut off, which is suitable for modern vehicle, trailers and caravans. Pulse Charging Algorithm: This algorithm is designed to select the optimum charge mode and revive your discharged battery. Multi-Stage Charging: This charger integrates bulk charge, absorption and constant voltage (float) to improve efficiency and prolong battery’s lifespan. Multi Battery Types: Compatible with AGM, Gel, calcium, LiFePO4, VRLA and flooded lead acid battery. Built-In MPPT Regulator: The regulator is designed to harvest more energy from the solar panel, thus reducing the load on your engine. Multiple Protection: It integrates over-charge, short circuit, over-temperature, thermal load, solar input overload, input/output reverse polarity protection. Internal Temperature Monitoring: This mechanism can effectively protect the circuit board, thus prolong the lifespan of the charger. Sturdy Construction: Sturdy aluminum housing is built to resist harsh conditions and quality wires are built for long last durability. Superior Versatility: This DC to DC charger is ideal for 4WDs, caravans, RVs, trucks, campers, trailers, campervans, commercial vehicles and boats. Vehicle’s alternator and solar panel are not designed to operate simultaneously.