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the-doon avatar image
the-doon asked

Cerbo relay control by SOC and voltage

Hi, would it be possible to add extra features to the relay settings menu of the Cerbo to include the option to switch the relays using SOC and voltage options? I’d like to use the higher end of the charge voltage to switch on a battery cell balancer on one relay and SOC to switch on a hot water element (dump load) using the other relay. Is this something that can be added to the next firmware update?

cerbo gx
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2 Answers
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @The Doon,

This is already currently possible if you set the relay control to generator start stop mode, and can then be set in the generator start stop conditions menu.


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the-doon avatar image the-doon commented ·
Thanks Guy. I tried that but the settings only allow you to use voltage the other way around. Start at a lower voltage and stop at a higher voltage. I want to start at a higher voltage and stop at a lower voltage. I suppose I could program it so the relay is powered 99% of the time and turns off to activate the balancers but it seems a bit backwards to me.
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luphi avatar image
luphi answered ·

You can also use the relay of a Multi

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the-doon avatar image the-doon commented ·
Thanks but I want 2 relays and the multi is off most of the time so I don’t believe the relays works in the off state.
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luphi avatar image luphi the-doon commented ·
If the Multi is off by the Cerbo and not by it's physical switch, it's relay will still work.



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the-doon avatar image the-doon luphi commented ·

I do use a remote switch but this actually might work for the HWS as I can leave the inverter on when hot water is required. Gives me something to think about. Thanks.

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