The problem with the throttled Fronius was resolved thanks to @Dognose. The problem was the option “Can you sell energy back to the grid: No” in the DESS-Config.
Edit:
Strange things still happen. It looks like mit Fronius ist still throttled from the Victron system.
Yesterday my system performed a planned Batterie balancing, thats the reason why my batterie was fully loaded.
As you can see my fronius was throttled the hole day only for needed energy.
The reason is I reached the calculated DESS of 49%
For testing I set the Batterie SOC to 100% and as you can see the PV production increased dramatically.
after switchen back to SOCS 35% the fronius was throttled again.
@dognose do you have again an idea why the DESS is doing that?