Will Hoymiles microinverters work in off-grid mode with a MultiPlus-II?

Q&A and troubleshooting
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1

Hello,

I currently have a grid-tied solar system using Hoymiles microinverters (AC-coupled). I’m considering installing a Victron MultiPlus-II with batteries to add backup capability and possibly operate in off-grid (island) mode during grid outages.

My question is:
:orange_circle: Can Hoymiles microinverters continue to operate and feed power into the system when the MultiPlus-II is running in off-grid mode and forming the grid?

I understand that microinverters usually require a stable grid reference (230V / 50Hz) to operate and that not all inverters provide a signal accepted by anti-islanding protections.

Does the MultiPlus-II provide a sufficiently clean and stable grid reference to keep Hoymiles microinverters active in island mode?

Thanks in advance for your support and insights.

2

Yes,

Have Fun

Marc

3

Yes, they do. But they are not ideal, when it comes down to throttling through frequency shifting, iirc they won’t go bellow 50% power, but rather shut off to 0 then.