My Victron shunt, with the BMV-712 smart, shows more recorded amperes than reality. The BMV-712 smart is connected from the shunt with an RJ12 UTP cable, and from the BMV-712 with a Ve-Direct / USB cable to a Raspberry Pi with Venus-OS. on the monitor it shows more power consumption than in reality. this is also the case with the 230V amperes from the quattro inverter. eg: reality 0.6A consumption, and on the Venus-os it says 1.2A.
The 24 Volt system: actually 10A, and on the Venus-Os almost 20A
The shunt is connected from my lifepo4 batteries minus cable and then to a central mass busbar. There are no other masses connected to the lifepo4 batteries.
I measured the actual recorded amperes with a professional ampere meter/clamp.
The story becomes even more exciting when we go sailing. from the alternator two buck boost dc-dc converters 50A are connected in parallel. the ground also goes to the central ground busbar and the plus goes to the plus of the lifepo4 batteries. My 1580Wp solar panels with two Victron MPPT chargers are also connected to this in parallel.
As soon as the buck converters start charging, the amperes bounce from plus 30 TO minus 200A while the lifepo4 batteries are properly charged according to the Bluetooth app of the lifepo4 batteries.
As a result, I cannot determine how full/empty the lifepo4 batteries actually are according to the shunt and venus-os monitor. I am well informed in terms of electrical engineering, but I cannot solve this.
Translated from Dutch by Google.