I’m planning on converting my “off grid” system to on-grid/hybrid. I use a single phase multi2 and Fronius Primo currently setup with ESS on AC out.
As I don’t want the hassle of making the Victron as exporting system (utility co. would require an additional meter) I would like to use the Fronius as the exporting device (which also has a smart meter, that I can use as grid meter).
If I use an transfer switch, the Fronius would switch between AC in and AC Out of the Victron, would this work seamlessly with the Mutiplus?
I don’t want/need to disable the charging feature, rather, I want the Fronius to continue to supply power in the case of a power outage.
Gird is ok - fronius supplies power via AC IN, grid is out, fronius connects to AC Out and forms microgrid.
As far as I know, if grid is out, the antiislanding prevents victron from making a microgrid with the fronius.
Every time you switched over the fronius position in the system would also need to change on the GX.
I think you will possibly end up with weird behaviour particularly with power control and stats on vrm.
Are you using ess or pv inverter support right now?
You are correct though, if grid is out and the fronius is before the multiplus, the Fronius will be powered down (depending on the model.)
For the microgrid to work it has to be on the output.
I think this also causes some problems regarding the grid code: On ACin, the country-specific grid code must be set on the Fronius, whereas on ACout, MG50 must be set so that the Fronius can be frequency-controlled by the Victron if it produces too much PV energy, which the AC loads and the battery together can no longer consume/absorb.
