Good day,
I have a victron off-grid 3phase system with these components:
- 3x Multiplus-II 48/10000 inverters with firmware V555
- Ekrano GX with firmware V3.66
- Lynx Smart BMS 1000 NG with firmware V1.14
- 10x Victron Smart Lithium batteries 25V - 200Ah
We noticed that one of the multiplus inverters suddenly stopped charging and even started to inject power in to the dieselgenerator!
(after a few times, this caused a voltage spike on the generator side which tripped the generator fuse due to high voltage on L1.)
Why is this single multiplus reacting differently than the other two?
Same hardware, same firmware, same configuration.
No ESS assistant is active. All DC cables are oversized and exactly equally long. At the point where one of the multiplus inverter throtthled down and even started to feed-in, no lower CVL or CCL limit was present.
Any ideas on why this happens?
Thanks!
settings VE config.pdf (282,1 KB)
How old are the MPs? Do they still use the older style headphone jack for the external current sensor? If they do, then i suspect a contact issue in the headphone jack. Newer models use a three pin connector/terminal strip.
There is no current sensor. It is an off-grid system on which the generator is connected to the AC-IN and the loads to AC-OUT.
Everything is measured by the internal current sensor of the MP.
Yes, but thats the core of the issue. The internal current sensor still goes through the headphone jack. Its described in the PDF
I’m sorry! Thanks for this information. I’ll check it.
It just makes no sense that only during some output power spikes, one of the MP’s drops its charging current and even starts to feed in.
Its just a possibility. You could also try adjusting the PowerAssist boost factor. Probably adjusting down, meaning towards 1.0 since it looks like the Inverter is overcompensating a load spike
