Convenient Dual Battery Bank ChargingXantrex digital echocharge (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 echocharge 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 echocharge is limited to 15 amps.Product Features 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 WARNING: This product can expose you to chemicals including Diisononyl Phthalate (DINP) which is known to the State of California to cause cancer, and Di-isodecyl Phthalate (DIDP) which is known to the State of California to cause reproductive harm. For more information go to P65Warnings.ca.gov. Specifications: Charger Output - Amps: 15a Charging Banks: 1 Portable: No Charger Input - Voltage: 120v Charger Output Voltage: 12/24v Box Dimensions: 3"H x 7"W x 10"L WT: 1.2 lbs UPC: 647912105722 Quick Guide (pdf)Owner&';s Manual (pdf)