Grid point issues with Multiplus II, VenusOS on Raspi4

DIY
1

Hi,

I am observing since some weeks a strange behaviour which I dont understand nor know how to debug it. Everything is configured as described in the manual and works in general.

However whenever I have a short lasting load like only 5 minutes water boiling or a longer load e.g. from the dish water the setup is not able to keep the grid point though there is still plenty of battery capacity. Instead of getting the whole setup spmehow in balance either the system draws too much from the battery and feeds it into the grid or the system draws too few from the battery. So the load on the smart meter constantly fluctuates between e.g. -500-2000W or +500-2000W but never keeps the set grid point (30W) over longer time. When I restart the VenusOS the grid point is stable however some hours later again when a higher load kicks in the systen is again out of balance.

I have no idea at all how to debug it. I already tried to update the firmware of multiplus and VenusOS but without success.

This is my setup:

Any help is appreciated, thanks so much.

2

What is the multiplus 2 3000 5000 8000 10000 15000?
Is the multi coving all loads ie on AC in as well as AC out?
But the fact your using an emulator for the grid set generation could be a factor and as it’s not a standard element to Victron you or anyone else won’t be able to successfully accomplish this.

Use standard equipment other wise warrant/manufacture would just state that it’s your modified element that’s at fault.

Either get a CT and use it direct through the multi or ET112 or similar think the 5xx something which is faster at response times only that way you’ll be able to fault find but you may find your problem goes completely.

Also have you got AC solar?

3

Hi thanks for your answer. You pointed me to the right spot to look into. The emulated grid meter delivered only every 10 seconds a new value. I changed it to immediately, i.e. whenever their is a change and this solved the issue.

best regards

4

Brilliant glad you sorted it.