For last 3 months I trying to set-up 3 phase/parallel system out of one EasySolar-II and 5 MultiPlus-IIs.
First, in June 2020 I purchased ES-II and 2 MP-IIs and set-up my 3 phase system.
After couple months I realized that 2.4kW per phase is not enough for my house.
Decided to add 3 MP-IIs in parallel.
Asked my Victron supplier if there is a MP-II still compatible with my MP-II for parallel operation.
In turn he asked Victron the same question and got the positive answer.
"There is no problem to connect the actual produced unit in parallel to existing. The only thing is - firmware must be identic (which means that the units are identic also)."
At the beginning of 2021 I received 3 new MP-IIs.
To make this story short, after setting all up I have a problem with load balancing in all 3 parallel channels.
All wires on the DC and AC are equal lengths from the point they split to master and to slave.
On DC side wires are 35mm2 (around 50cm long from the split point) and on the AC side 6mm2 (around 60 cm long from the split point).
FWs are identical.
I am getting the following results when each phase is, one by one, loaded with 2.4 kW resistive load.
L1 Total 66A, Master 38A, Slave 28A
L2 Total 54A Master 32A, Slave 22A
L3 Total 55A, Master 32A, Slave 23A
Any suggestions how to make the currents equal?
The stickers on the boxes show the model numbers and part numbers of the first and the second batch.