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.