Cerbo-S-GX, SOC for relay heater control

DIY
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1

I have a Cerbo-S-GX, and have the relay connected to the “remote on/off switch” on a Smart Battery Protect which is connected to a heater. I like to run the heater when the Battery SOC is >90% in order to warm up and dry out my engine compartment and reduce condensation.

I essentially need the same GX Relay control as for the Generator Start/Stop, but inverted. I want the relay to close when SOC is higher than 90% (starting the heater), and to open when Battery SOC is lower than 85% (turning the heater off), or something like that.

Is there a way to do this? I can’t see how. I could also use Voltage, or Temperature, if those are options, but prefer SOC if possible.

Thank you!

2

If you are not using the generator control you could always use that to start/stop a generator and use the opposite contacts on the relay (swap NO for NC or vise versa) to get the heater running when the generator would be stopped. The other alternative would be to install the Large Venus OS image and use node red to drive the relay. There is a node red category if you want to explore this further / ask help etc.

3

Thanks for the quick reply – didn’t think about switching the contacts; that should work for me. Cheers!