Originally Posted by Trf85373
Here is a diagram of my system
I believe that it is wired per your description.
The result is that I get proper voltage reading from the house batteries 13.2 - 13.8. However I get a positive amp reading of 15+ amps while hooked up to shore power and about 14+ amps when unplugged.
I get no voltage reading from the starter batteries.
Wiring looks fine...
Might double check the settings in the Victron Connect App. That is where you specify the function of the second channel, in your case a second battery bank. Long shot, since I think that is the default choice anyway.
I can understand the positive amp reading when Shore power is connected...the converter may be charging the bank. The positive amps going into the battery with no shore power...unless solar, or some other source...that is a head scratcher.
A Clampmeter that can measure DC amperage would be handy. You can compare readings to those displayed on the BMV...and also check leads to see where to trace the current. If the clampmeter is in disagreement with the BMV, there may be an issue.
Things that can adversely effect the amp reading in a BMV is the shunt setup. Victron has a choice of shunt values in their setup menus, make sure to select the one appropriate for your shunt. Again, I believe the shunt that it comes with is the default value.
I think the amp reading should read correctly right out of the gate. The SOC reading will need to calibrate...normally by watching a full charge, and comparing data to the aH value you gave it. Of note...if you have four 210aH batteries, for example,,,and you wire them in series-parallel. The value for the Victron would be 410aH...since you have them configured to be two 210aH 12v batteries. Not 840aH, which is a common mistake. That should only mess with SOC reading accuracy though. Not impact the amp readings.
Clampmeter might help you sort this out..