Automatic relay for charging second battery 12V/140A

Automatic relay 12V 140A for connecting a second battery.

Availability

- fully automatic operation

- relay switches on when the voltage reaches 13.3 V

- disconnection of the relay when the voltage drops below 12.8 V

- simple three-wire connection to the battery

- overvoltage protection

- indication LED

- suitable for charging currents up to 140 A

- no voltage drop, thanks to high-quality components

- monitors the voltage of both batteries

- consumption in open state: 16 mA

- consumption when switched on: 320 mA

- battery connection via M6 contacts

Dimensions

- 67.5 mm (L)

- 67.5 mm (W)

- 53.5 mm (L)

Connection:

- Black wire - skeleton

- contact M6 - starter battery + 12V

- contact M6 - secondary battery +12V

Operation:

Using this relay it is possible to charge 2 batteries simultaneously. When the engine is started and the starter battery reaches 13.3V, the relay connects the 2 batteries in parallel (starter and secondary) which are then charged simultaneously. If the voltage drops below 12.8V (for example when the engine is switched off), the relay disconnects, and the two batteries are separated. This system prevents the starter battery from discharging and protects sensitive electronic equipment connected to the secondary battery from voltage spikes that can occur, for example, when starting the engine. The intelligent electronics also switches the relay when the secondary battery is being recharged from the solar panel, for example, and thus also allows the starter battery to be recharged.