This is exactly the direction that I have been exploring.
I have been considering running a 48 volt DC forklift motor as my genset and having that feed an Outback inverter. I called Outback and discussed this with them, and saw no reason why it wouldn't work.
I was exploring this because, with a 48 volt batt bank, I would also have a way to auto start the engine.
This can also be done using other lower voltages as well, as long as the inverter is designed for the target input voltage.
No, it wouldn't be EMP protected if we were attacked, but it would give very clean power the rest of the time.
Conversion efficiency would be in the 93% range.
Steve