Xantrex 815-3524-02 Freedom SW3524 24V 230V Inverter/Charger, 3400W Output power, 6800W Surge rating, Parallel stacking capability to double the inverter power outputXantrex digital echo~charge 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. Key Features15A maximum charge currentAutomatically 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-chargingUtilizes excess current from the primary charging sourceBuilt-in thermal and over-current circuitsReverse polarity protectionEasy three wire installation SpecificationsSwitch ON voltage (12 VDC mode): 13.0 VDCSwitch ON voltage (24 VDC mode): 26.0 VDCOutput 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"Weight: 1 lbs