Xantrex Echo Charge Auxiliary ChargerModel: 82-0123-01 15 A maximum charge current Automatically adjusts for 12 or 24 volt battery banks (both battery banks must be the same DC voltage and battery type) Automatically switches on/off without affecting the in-house battery bank or over-charging Utilizes excess current from the primary charging source Built-in thermal and over-current circuits Reverse polarity protection Easy three wire installation Xantrex’ digital echo~charge (part#82-0123-01) is designed to charge auxiliary or starting batteries from an inverter/charger or other charging source with limited voltage drop. The Xantrex echo~charge detects when the house battery bank is being charged and directs a portion of the charge current to auxiliary or starting batteries. The maximum charger current offered by echo~charge is limited to 15 amps.Specifications Switch ON voltage (12 VDC mode) 13.0 VDC Switch ON voltage (24 VDC mode) 26.0 VDC Output amps 15.0 A (maximum) Voltage limiting (12 VDC mode) 14.4 VDC ±1% Voltage limiting (24 VDC mode) 28.8 VDC ±1% Dimensions (HxWxD) 5.5 x 4.5 x 1.25"