question

polly-nowak avatar image
polly-nowak asked

Multipluss II limited grid feed instable

I have my Multiplus II 48/3000 configured the Cerbo-S GX (FW 2.88) to feed PV excess to the grid, but with a limit of 600W. However, the feed in is not stable. It goes to -600W feed in, and then reduces roughly back to the grid setpoint, then it goes up again to -600W, and back down, and it keeps looping like that. If I set it to unlimited feed in it works with a constant feed in of -2300W and no drops whatsoever.


On the DC side there are several Victron MPPTs all controlled externally by the GX and a 15kWh Battery, so there is enough DC Power available for a stable feed. What did I do wrong?

bild-2023-06-13-123128983.pngbild-2023-06-13-123428153.png

Multiplus-IIfeed-in limit
bild-2023-06-13-123128983.png (22.9 KiB)
bild-2023-06-13-123428153.png (26.3 KiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

3 Answers
matt1309 avatar image
matt1309 answered ·

Hi @Polly Nowak


Try enabling shared voltage sense in DVCC on cerbo gx?


I had similar issues where MPPT would turn on and off repeatedly when reaching the Maximum feed-in limit. Which for me just resulted in small peaks in battery voltage but maybe in your setup/with more MPPT's that's overflowing to AC side? Long shot but maybe the cause.


2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

polly-nowak avatar image
polly-nowak answered ·

Thank you for the reply. I tried it, but unfortunately, it did not solve the problem.

2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

matt1309 avatar image matt1309 commented ·

Guessing you've tried this but checking connections on MPPT to cerbo, and maybe just giving everything a reboot. SVS was what sorted it for me.


Can you see anything unusual happening on the DC side. Do the spikes correspond with MPPTs turning on and off?

0 Likes 0 ·
Show more comments
szdan avatar image
szdan answered ·

Did you ever find a solution to this?

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Related Resources

MultiPlus-II Product page 

MultiPlus-II Manual

Multiplus-II GX Online Manual

MultiPlus-II 230V Datasheet 

VE.Bus Error codes

Additional resources still need to be added for this topic