The subsidy went away so I put my solar plans on hold but I had decided that I would put transfer equipment in and use 2 inverters if it came to it.
I did wonder if you could "tickle" the grid tie inverter with a regular 12v inverter to light it up after the real grid was switched away. I am just guessing but I suspect the solar inverter looks for voltage coming in on the utility side at each zero crossing and does not gate the solar inverter if it doesn't see something. I suspect the problem would be that your 12v inverter could not push into the attached load hard enough to get things started.
The real answer would probably be 3 pole transfer equipment switching both phase legs and the DC output to a non-grid tied inverter.
