question

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kent2ben asked

Inverter/multiplus makes voltage fluctuation in BMS measurements

Hi

I hope som of you can help me with my problem.


My setup

- It is 24v
- 4 x MPPT 100/50
- 1 x Multiplus ii 24/3000 (connected ESS connected to earth)
- JKBMS 8S 280AH


My problem

I have som strange voltage fluctuations on specific cells according to my BMS (A meter shows stable voltage)

1.jpeg
As you can see cell 7 is all over the place (blue line) and this is with 300-400W load on the multiplus inverter + the mppts are charging.
(you can see the load amps in the graph)
I tried replacing the balance leads with no effect.

Then I tried turning off the multiplus and only charge with the mppts.
3.jpeg
And then the fluctuations despaired?

Info about my JKBMS

2.jpeg


Do any of you have an idea of what is happening?
Can the inverter make some kind of noise running back to the BMS ?
Can I connect the BMS/battery too close to the inverter ?

Multiplus-II
1.jpeg (298.2 KiB)
3.jpeg (195.8 KiB)
2.jpeg (418.9 KiB)
2 |3000

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