Parasitic Battery Drain

[Happy Place]

Everything is turned off. The master breakers are off. So why am I seeing negative numbers in Voltage and power? Am I reading this wrong? My solar is putting in power right now ...is a negative number indicating power going in?

 

[JMarshallR25]

Just an anecdote, but the factory wired the shunt for my Victron battery monitor backwards. In that case it will read power coming in as negative. You can add a large load (a/c, water heater) and see if this is the case for you. If that shows up as positive, your shunt is backwards. You may want to check that basic issue before hunting down what might be creating this draw.

 

[Lake Effect]

View attachment 25303Everything is turned off. The master breakers are off. So why am I seeing negative numbers in Voltage and power? Am I reading this wrong? My solar is putting in power right now ...is a negative number indicating power going in?

What did you find out?

 

[Submariner]

Just an anecdote, but the factory wired the shunt for my Victron battery monitor backwards. In that case it will read power coming in as negative. You can add a large load (a/c, water heater) and see if this is the case for you. If that shows up as positive, your shunt is backwards. You may want to check that basic issue before hunting down what might be creating this draw.

The most recent version of software updates for the Victron shunts now has a feature called "Current Measurement Direction", the default is "Normal" There is an option for "Reversed", making it easy to correct should the shunt be wired in backwards.

 

[DDean]

In my case the actual wiring for the boat was different than the schematics with the difference being that the positive from the solar is on the thruster battery and not one of the house batteries. So when I installed my shunt, I capture the negative from the solar (now on a bar) but not the positive. That leads my shunt to reading input from solar as a negative - I think anyways. I’m not looking forward to dragging those batteries out again to confirm.

Perhaps you’re in the same boat?