I am sorry for being unclear:
The factor 1 rule is obeyed.
I’m talking about the min battery capacity in 3.2.
I will obey the rule if necessary, but finding a way to get around this would be preferred.
I have a lot of ideas how to get around this, but first of all i think i have to understand why this rule really exists.
@lxonline : That is what i want to find out. As far as i have in mind it is about the following scenario:
Battery is full, Inverter runs at max, grid fails: Frequency shifting / Inverter adapting is to slow => stress for the multi &battery.
But this is all from my memory of posts i read about it. Some people said to just ignore it.
I found no good resource why this rule exists and if there are ways around it.
Another example: If this is only a problem with full battery i could normally connect the inverter on ac-in and in case of a power loss with an SoC < 90% i could could connect it to ac out. This could be done with some external relays
edit: I Just found a interesting thread: Minimum battery size for fronius AC coupled system - #14 by lxonline
There on the last post the author said it is about the charging amps.
The battery i use is this one: https://www.nkon.nl/de/amfile/file/download/file/1589/product/5836/
with 157A * 48V = 7536
This would be ok for me. The inverter currently runs at 9600W * 70% = 6720W to obey German law. I was planing to increase it in order to not cap the inverter at this limit and rather cap the feed in. But capping it to 7500W (my base load is > 500W) seems acceptable for me.