question

Pierre-Marie Baty avatar image
Pierre-Marie Baty asked

Multiplus-II GX throttling down PV inverter on grid loss

Hello all,

I have a grid-tied home ESS system with a MultiPlus-II GX, a PV array with a Fronius Primo inverter on AC OUT, and a BYD battery connected to the Multiplus.

Each time there's a grid loss (happens very often over here) all the PV power from the Fronius inverter is instantly throttled down to zero, even in case of full sun exposure. Consequently, for all the duration of the grid loss, all the backup power is provided by the battery only.

I have the feeling it's just a waste of solar power. Why can't the Multiplus allow the Fronius inverter to continue its operation in case of grid loss ? Its power added to the battery power could sustain much more loads than just the battery alone.

Is that a bug, is there a reason, or am I missing a hidden setting somewhere ?

Thanks everybody for your insights.


Multiplus-IIESSgridFroniusBYD
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

2 Answers
netrange avatar image
netrange answered ·

Microgrid "50" or "60" is enabled with the Fronius ?

11 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Pierre-Marie Baty avatar image Pierre-Marie Baty commented ·

I can't find where this is set in the Fronius inverter config (logged in on the Fronius as "service", looked into all the tabs, but I couldn't find anything like that. "Dynamic power reduction" is "off"). Could you please tell me where to look ?

0 Likes 0 ·
netrange avatar image netrange Pierre-Marie Baty commented ·

There is a key combination for this

Look in youtube for the video ... Fronius Microgrid


0 Likes 0 ·
Show more comments
Pierre-Marie Baty avatar image
Pierre-Marie Baty answered ·

Indeed I had naively commissioned my Fronius inverter with the local country code (FR) and not with "MG50". Accessing the hidden menu from the front panel and starting over allowed me to fix that.

I can now see the PV inverter supplying the loads along with the battery, when I switch off the mains. Switching the mains back on temporarily throttles the PV inverter off (I suspect this is intended and normal), then it starts supplying PV power again. That Multiplus is one smart machine.

Thanks !

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.