Alan Gill Posted December 2, 2019 Report Share Posted December 2, 2019 I'm wondering if you could help me with a question about using a low voltage controller on a 12 volt car auxiliary circuit. The set up I have is this: A 12 volt auxiliary battery that provides power for a 12 v fridge. The auxiliary battery is charged via the alternator and a solar panel. I want to put a low voltage controller into the circuit so that the battery does not get drained below 11 volts. I have purchased a control unit but I am concerned that the wiring for the fridge is too heavy for the small controller to wire it directly into the circuit. What I am wondering is can I wire the low voltage controller through a relay that would turn the power on and off to the fridge? I assume that I would need to put some sort of electrically controlled switch that the relay would activate. Quote Link to comment Share on other sites More sharing options...
HarryA Posted December 4, 2019 Report Share Posted December 4, 2019 That seems like a good idea. I gather that such refrigerators draw something like 5 to 7 amperes. A relay could handle that; such as: https://www.ebay.com/itm/NEW-Philips-ECG-RLY1522-12-Volt-DC-Coil-10-Amp-SPDT-General-Purpose-Relay/251877100313?epid=2282812589&hash=item3aa50b8b19:g:qVsAAOSw7ZFVAh~t I think one should put a diode across the relay coil (in reverse) to protect the controller. Quote Link to comment Share on other sites More sharing options...
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