asked
Is it possible to install only 1 victron multiplus with batteries for backup and storring energy in a three phase system that has a fronius symo 8.2 installed. ? I want to backup only 1 phase and charge the batteries from the excess solar power
Hi!
I think it is possible. But only if you connect the fronius in the Multiplus Ac input. Connecting on the output Will be a problem because the Multiplus Will try to moderate the frequency on the ac output but only on the one phase of the symo. I think this is not acceptable.
If Fronius is on the Multi's input you can have this Multi only on one phase.
When grid fails only this one phase will have power.
Fronius without grid will just turn off.
Hopefully the multi controlling the fronius via modbus wont throttle down the fronius. Meaning if there is consumption on the order two phases will fronius increase power output to deliver to them as well?
Multi should not throttle Fronius back when is connected on AC-in.
Throttling back happens when Fronius is on AC-out, grid is missing, battery is full and load is smaller than Fronius production.
With Fronius on AC-in this will never happen, because when grid is missing (even if only on 1 phase) Fronius is off on all 3 phases.
