RV Battery DC-DC Charger 40A Dual Battery System (2 ways Charger)

This DC to DC battery charger has a wide range of input voltage options between 7-24vdc with a maximum solar input current of 40a and output current of 40a max. The charging voltage can be set to any value within the specified range while the idle power consumption is only 10mA. Additionally, it is rated at IP54 which makes it suitable for harsh environments. The soft start feature ensures that the unit starts smoothly without causing damage to the device being charged. Other features include a bulk charge voltage of 40a, soft charge current of 4a, and a weight of only 710g.

Detail Spec：

Battery Type Selection Long press “POWER” button for 3 seconds to enter selection mode, and the LED indicator will be blinking. Press “POWER” to select the type you need. Then long press “POWER” button to exit. It has a power-off memory function, and will remain on this battery type until it is changed. Lithium Reactivation In this mode, the DC-DC charger will automatically reactivate your sleeping lithium battery if it was stored in a discharged state as self-discharge would gradually deplete the remaining charge. A small charge current will be used from the auxiliary battery to activate its BMS. Please note that the battery should be disconnected from the load, and that the polarity should be correct. Both DC and PV inputs are supported. Input Priority When both solar and DC input meet the start-up condition (which does not mean you need to connect both solar and DC input), the charger will automatically choose DC input. Even if solar input is chosen to charge your battery, the controller will consistently detect whether the DC input meets the charging requirement and will switch to DC supply when it meets that requirement. ACC Line For vehicles with a smart alternator, you’ll need to connect the ACC line to a switched ignition source (a point that supplies 12V only when the key is in the “ON” position and disconnects when the key is in the “OFF”position, for example) of your vehicle, usually it can be found in the vehicle’s fuse box and a fuse tap can be used. Then the main battery will start charging your auxiliary battery.