Actually no shunt and MPPT was connected. Current from battery measured with clamps is around 0,4-0,6A (not very accurate device) at 26,5V, so it should be around 10-20W.
It’s interesting why Multiplus uses assumptions. Isn’t input DC current measured or it’s below accuracy range?
Not on some models no.
The shunt is the best way to measure.
Is it normal, that I measure AC current in battery wires when load is powered by Multiplus from AC side?
How are you measuring that?
With current clamps in AC current mode.
Measured with 2 clamps. One quite accurate shows 2,6A AC mode and 0.55A DC (2%+5) mode at no load, similar proportions with load.
Probaply just dc ripple i think
Is a good place to look.
It explains why you get the reading and when to know it is bad.
I don’'t see how it explains, created separate topic, with some additional information: