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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?
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.
If the rules were modified slightly to allow whatever voltage or SOC value the generator start/stop option would work. As it is now I’m unable to set the values I want and see this if I try.
Image Caption
Hi @The Doon
My relay control logic is a little bit rusty, but can't you do that by just inverting the state of the relay by using the normally closed instead normally open contacts.
Normally Closed
Start at low (opening)
End at high (closing)
10V = open
14.4V = close
Normally Open
Start at low (close)
End at high (open)
10V = close
14.4V = open
Functionally the same as:
Normally open
Start at high (close)
End at low (open)
Low voltage 10V = open
High voltage 14.4V = close
I have never heard any advice to the contrary.
The warnings about the relays are more to make sure they are aren't actually switching any more current or voltage than is required to drive a larger contactor that actually handles the load, or even better activate a voltage free contact detection.
Continuous activation (and using either of the positions) is intended use.
You can also use the relay of a Multi
