Pylontech Battery goes to Error once grid goes off

DIY
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1

Hi dear Community,

I have the following setup:

Multiplus II 6k5 + single Pylontech US5000 + Cerbo GX MK2

The issue I have - once grid goes down, battery goes to error, it waits for 10-15 seconds, restart, and Victron works fine since.

The only related stuff I occasionally can see in Alarm logs:

VE.Bus System [276] Low battery: Alarm

This ONLY happens once central grid goes offline, if I disbale AC IN via Victron’s circuit breaker everything works as expected.

Usual load during this issue for my setup is under 200W (monitors, laptops, phone chargers, lights, fridge)

Everything is up to date, no errors anywhere. I didn not perform any setup via VE Config utility, just basic setup in cerbo ( DVCC related).

P.S. I understand that it would be better to have at least 2 batteries, but I have to deal whith what I have. I will add second battery once this will be possible.

2

try to do the setup via VE Config? i´d say it is necessary

it could be done through VRM portal, no need to connect the PC directly

3

Follow the pylontech setup guide. Defaults will not work.

4

do I need to have VE Configure steps done as well?

5

Yes, since most of them set the correct voltages for Pylontech

6

will setup via VE Config utility once grid is back online

7

according to the Victron Manual, the system will Autoconfigure for a Pylontech Battery, but i wouldn´t trust

You know you could do VE-Config through VRM - download the File - then in VE-Config “Fake Target from File”?

8

I’ve completed setup as per this guide (ESS assistant didn’t appear though, but that would be another story to explore).

Will monitor the behaviour of the system.

9

Please read the setup documentation and the online training. The assistant has to be loaded and configured using a supported grid code.
It is detailed in the battery config docs.

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10

To me you just haven’t got the right amount of batteries for the spike that the battery has to take up to take over. You only have one battery even the 5k multi has minimum of 2 US5000’s so I believe that is your real issue hence why it works on the grid PS that Multi might even need three in total as it’s a bit more than the 5kVA multi

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11

Looks that way as well. And a bad grid is the same requirement as off-grid, the battery requirements are higher, something you will really notice in a grid brown-out.

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12

Seems so, 6k needs 250 Ah as the very minimum according to the manual.

I guess I’ll stick with this issue for now.

Will propritize though adding at least 1 more battery.

however what bugs me out still - why this only reproduceable only when city’s grid goes off, when I cut off manually - transfer is perfect and without issues.

13

Hi Dmytro,

I have the same setup and I had the same issue. I’ve added one more battery and now it works fine.

I cannot explain what is the difference between manual disconnection and when it is disconnected by electricity provider. Maybe it is related to some electricity spikes from line…

The only thing I know is that the root cause of all these problems is our neighbor