This advanced fully automatic three-stage 30 Amp battery charger is ideal for charging all types of 12 Volt lead-acid batteries ( Flooded / Absorbed Glass Mat (AGM) / Gel Cell) from a 120 VAC, 50/60 Hz (default) or 230 VAC, 50/60 Hz (internal jumper setting) AC source. By means of a DIP switch setting, conversion to a two-stage algorithm is possible to charge batteries connected to a DC load (DC UPS). The unit can also be used as a DC Power Supply. Features include overload, short-circuit and over-temperature protection. The unit allows charging of up-to 3 separate battery banks.