20A dual battery solar charge controller / regulator for 12V / 24V batteries

This high-quality 20A 12V/24V dual battery solar charge controller is designed to charge and protect two batteries simultaneously, with automatic cutoff to prevent overcharging. The controller uses PWM (Pulse Width Modulation) technology, which increases charge acceptance and prolongs the life of your batteries.

The PWM technology can also recover some lost battery capacity. This solar controller is perfect for a caravan, camper van, boat, or another system with two batteries (e.g., engine and leisure battery) or two battery banks.

 You can set the initial charging priority, for example, 80% engine battery and 20% leisure battery. When one of the batteries is fully charged, the controller will automatically divert all current to the other battery. This controller can work with solar panels up to 320W (12V battery system) / 640W (24V battery system).

Can the unit work with only one battery? Yes, absolutely! The controller will automatically determine if there's only one battery connected and will pass 100% of the charging current to this battery. You can add a second battery later. The unit has many protection functions, such as stopping reverse current at night (from the battery back to the solar panel), overcharge, short circuit, reverse polarity, etc. Other features include various LED indicators, battery type selection (sealed, gel, flooded), and an RJ-45 socket for an optional remote LCD meter with 10m cable. A built-in temperature sensor allows the controller to optimize the charging process depending on the ambient temperature.

 If you are planning to position the controller far away from the battery or if the battery and the controller are exposed to different ambient temperatures, an external remote temperature sensor with a 3m cable is recommended for this dual battery solar charge controller. To enable connection to the screw terminals of the controller, the green connector block on the end of the remote temperature sensor cable should be unscrewed. Click on the "Details and Specifications" tab for more information.

Controller specifications:

- Rated charging current 20A

- Fully automated operation and auto 12/24V selection

- 3 pairs of terminals (input, battery 1, battery 2)

- LEDs to indicate the state of charge

- Temperature sensor for temperature compensation of charging (-30mV/C/12V)

- RJ-45 connection point for a remote meter (not included)

- Various protection features (overcharge, short circuit, reverse polarity, etc)

- Self-consumption: 4mA at night, 10mA when charging

- Working temperature: -35°C to +55C

- Terminals for wire up to 4.0mm2

- Size: 15.5 x 7.6 x 4.0 cm

- Weight: 230 g

- Multiple mounting holes for ease of installation

- Covered by a 1-year warranty

Installation:

This product comes with a detailed instruction manual that explains connections and operations (see "Documents" tab). If you need help with installation or have any technical questions, we can provide FREE support - please contact us by email or phone.