phatty mo wrote:

Why not a small dc-dc converter,from your main 12/24/48V battery bank..

I don't have a battery bank.

Safer,and probably more efficient. (takes the inverter out of the
loop,atleast.)

If your main inverter doesn't run 100% of the time, you might make the cap
larger to charge the battery more when the inverter does run. This circuit
itself is unlikely to make the inverter come out of hibernation.

Nick