When I select the PV panels on, the system always shows a higher wattage coming from the battery than the panels are providing. With panels selected off, DC load is normal.
Background: this is on a boat, with the following setup:
-2040 amp hour AGM battery bank
-dual alternators off the main engine charging via a Balmore voltage regulator
-dual victron multiplus 3000 inverters/chargers
-BMV 712 victron battery monitor
-12kw and 20kw gensets
-all monitored by victron color control GX and victron app
This all worked fine until the addition of:
-two victron 150-100 mppt controllers
-4 × 455w panels
Install was done by a shop, but I suspect not correctly. I am unfortunately very weak on this subject.
There are other symptoms, but I suspect the first line of this post will allow someone on here to zero in on what is hooked up wrong.
Two photos of the color control attached. I have tons of other data and screen shots if it helps.
I suspect the MPPTs were connected directly to the battery negatives instead of the negative busbar after the shunt.
The shunt measures 572W discharge since thats all it sees. But the MPPTs transmit a total of 1408W of charge. For the system this means adding up both numbers, thats a total load of 1980W. Which of course is incorrect since the MPPT charge power does not pass through the shunt.
looks like you are right. It’s a little confusing because the lower busbar looks like one piece but it is two, split where the red lines are. Battery cables have the red tape. I’ll switch it and see.
Only the battery negatives should be connected on the battery side, so also the ground wires should go to the system side. Looks like the system side ground bar needs a replacement that is at least double the length/bolt holes to accomodate all those cables
Hard to say from just cables, could be ok, i dont know what this shunt does exactly. Thats not a victron shunt, or at least the measurment cables very likely dont go to a victron device, since shunt measurments are always done on the negative with victron
