Hello together, I am encountering a situation where the Victron SmartShunt reports a discharging current, even though both the JK BMS and independent measurements indicate there should be none. So i have the electric water heating unit, full sun outside but PV is delivering 2.1kW but at the same time battery is “discharging” with 1920W which is not true.
Has anyone experienced a similar issue?
Thank you in advance for your support.
Not really lots of information, but to me it looks like the pv minus from the mppts is connected directly to battery minus, not to the load-side of the shunt ?
There’s nothing connected directly to battery minus (side of the shunt). PV strings are connected right to mppt’s inpust only.
But that is the only way your data correlates.
you’re right, find it. Latest mppt 250/100 installed has been connected wrongly to b- instead of system minus. Thanks!
If it is not that it needs a zero current claibration.
Also you need to make sure your lug stacking has the low current connection on top of the high current ones. Check your negative there with the lug going to the shunt. As a further point is the cable there the same gauge as the cable feeding the inverters? Should it not be the sum of all the inverters it is feeding?
Good morning !
The problem has been solved 5 hours ago 
You were spot on Ludo.
But just in case someone else comes along thinking they had the same issue and hasn’t made the same mistake, i though to add another possible point of troubleshooting.
Since @kta22 is set on improvements to his system the lug stack also needs attention.
That was easy
Lol
Indeed, I will update busbar and main battery conductors. Thanks for hint.
Don’t feel bad! I have found this on many, many marine installations over the years. 
In fact busbar only because main conductors are 70mm2 (batt to shunt and shunt to each Multiplus inverter).
