Battery Backup for a Grid-Tied system

[NetComrade]

The generator on the other hand can NOT magically create fuel when electricity is shoved down its throat....

Gives me a laugh every time I re-read this thread.. THanks.

[NetComrade]

SolarEdge can and does drop off production with frequency modulation But it does not drop off individual optimizers.

The bimodal system will need a disconnect method from the grid though to insure no back feeding or shorting from the grid.
The bimodal inverter will also need a way to disconnect the grid tie inverter as mentioned to shut it completely off when not needed.

Outback radian has three AC connections and frequency modulation in this way dedicating one of the AC connections to the grid, one to the grid tie inverter and one to the load.

This is from Radian Documentation (AC Coupling Grid Tie Inverters With
OutBack Battery-Based Inverters from 2017)

http://outbackpower.com/downloads/documents/ac_coupled/app_note_acc_new.pdf

Grid Tie Inverter Compatibility
OutBack Power has successfully tested our AC coupling solution on SMA, Enphase and SolarEdge inverters.
SolarEdge does not support blackout relay solutions, but has something called a Power Reduction Interface Port
that can be used instead of a blackout relay to take the inverter offline.

Sounds like it shuts them down. Outback calls the feature "frequency shifting" to slow down the Grid Tied Inverter.