I have a 48v DC only system and can’t figure out why the VRM dashboard is showing the wrong numbers. I have a constant ~37W load and yet when the solar kicks in the DC load matches the PV output. The DC Load should be displayed via the Smart Shunt installed.
I see 3 wires on the battery negative busbar??
There should only be 2: the wire to the shunt and the wire to the battery. the B- from the MPPT needs to go to the load side of the shunt.
Mike, thanks for your response!
I was hoping the PV would be considered an “input” and not part of the “load” calculation. I would like to be able to track what is “taken” out of the system separately.
If I connected the B- of the MPPT wouldn’t that disrupt my load calculations?
I guess what I am trying to say is if I had a 100w motor running and had the PV connected to that side of the shunt, at times it would show the load of the motor at 0 assuming PV was putting out 100w+??
Traditionally the shunt is used to monitor the battery, not the load.
If you said the charge to the battery, rather than the load of the motor, then yes. As you have it wired as a load monitor,then I think this can be configured so in the Cerbo - which will otherwise assume that it (the shunt) is a battery monitor.
If power flow from the battery is regarded as positive, then PV power + Battery Power = Load power. So what you read from the shunt depends on how it is wired up.
Once the battery is fully charged, or “floating” then PV power = load power.