Automatic relay for charging second battery 12V/250A + voltmeter

The automatic second battery charging relay is designed to automatically switch on/off the backup battery and separate the main and backup batteries. It allows autonomous operation of the batteries. This allows one of the batteries to be used when the engine is not running to power additional equipment (music, camper, etc.). This prevents the main battery from discharging. The relay can be used on automobiles and 12V boats.

The relay includes a control panel with a display showing the voltage of both batteries and the possibility of freely adjusting the switching voltage and mode of operation, or manual switching.

Technical parameters:

- operating voltage: 12V.

- max. switching current: 400 A

- nominal switching current: 250 A

- current draw: 4 mA

- ON voltage: 7.0 - 17.0 V

- OFF voltage: 7.0 - 17.0 V

- setting resolution: 0.1 V

- ON/OFF delay: 6s

- weight: 0.325 kg

- relay dimensions: 105 x 73 x 64 mm

- control panel dimensions: 70 x 51 x 21 mm

- panel cable length: 3 m

- battery connection terminals: M8

- Waterproof: IP64