Is it normal to have AC Out drops when the grid is lost?

DIY
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1

Hi everyone,

I have my Multiplus II 48/6k5 GX for some 2 full months now and I have fixed most issues which were mostly from my lack of knowledge of the various parameters (I installed the device myself based on the many hours of reading and watching videos).

My installation has an AC Coupled Huawei inverter which holds the solar panels. There is a 16KW Dyness battery as well. Just today the grid was out for 4 hours and I am very happy with the investment so far. The PVs continued to produce and charged the battery to 100% after which they were throttled to just what the house needed.

I wanted to ask the people that have their installation for some time now, a simple question: do you have a drop in the AC out when the grid is lost?

I happen to notice this more easily because I have an old LED clock with very large digits which always resets when there is even a small drop in the power. So.. I may be oversensitive about the topic, who knows.

I mean, the MP should act as a UPS, right? I’ve read about a “UPS” behavior parameter, but I don’t see that parameter in the VE Configure 3. Don’t know if this is due to the grid code (Romania) or some other thing.

And now, for a tougher question: how would I go about investigating this topic? For example, in one instance, there is no mention of any alarm or anything in the logs anywhere. It’s like the MP does not even “know” that there was a drop.

Note: I have not explored in detail the charts from VRM, so any recommendations are welcome.

Thank you!

2

The inverter is not a UPS in the strict sense of the word, it does not smooth out power fluctuations, in a victron system it means that the cutover is fast enough for almost all devices not to notice.
Terms do apply.
If you overload an inverter or battery at cutover the system can drop and restart in 30 seconds.
Because AC out mirrors AC in, if the grid browns out letting the voltage drop too far you can find some sensitive electronics will restart. This is to be expected.

3

I see. I guess that answers my question then.
Thank you!

4

Very possibly.
The grid code side dictates the response etc.
The more likely cause is a brown-out type condition where the inverter stays synchronised as the voltage drops and this cause a short blink in power.