Battery Cut Out Relay

To further reduce the relay coil current i employed a relay economy technique described in a previous post.

Battery cut out relay.

Buy battery charge controller protection switch digital display on off relay charge controller for 12v 24v battery. The electromagnet consists of 2 coils shunt and the series. Further reducing relay coil power. Simply flip the battery disconnect switch and the flow of current from your battery will be shut off.

A fused switch will maintain current to your alarm on board computer central locking system and stereo but still prevent your car from starting the current generated when attempting to start the vehicle will blow the fuse and shut down all electrical. A battery disconnect switch makes this easy by allowing you to disconnect the battery without any tools. The circuit responds cutting off when the voltage of the batteries goes below 22v and rearms at around 23v actually the batteries serial voltage is around 24v as i have 3 power diodes in series with the input which reduce the measured voltage at the zener in 2v approx. A battery disconnect switch is also a great tool for cars that you only take out on special occasions.

Therefore the battery will cut off when the battery voltage of each li ion battery is at 4 2 v approximately. Adding two common components reduces the relay coil voltage and current to 70. Hi iceng i am implementing this circuit with a 22vz zener to cut off two serial 12v lead batteries. As an experiment to turn on a genset to turn on a generator and the generator and inverter takes care of charging my battery bank.

I had to cut two traces one. Also when the relay drops out the control circuit current drops to about 4ma thus minimizing battery drain. A simple cut out relay is as shown in the figure. Use of diode d3 as internally the relay has an inductor coil this coil stores some charge when the relay gets activated or energized.