I've worked with 800VDC & unlimited amperage. Umnn, letsee... never speak of HVDC in the wild as you would in a laboratory setting.
The converted inverter generator would not be in a clean room fire proof room, it'd be around people, children, animals. Also rain, lightning storms, humidity, dust, pollen, generator exhaust, metallic oxide from relay action, then add condensing atmospheres... pollutants are endless. Also long term heating is involved so insulator breakdown is very likely, with heat comes raised tracking/creepage. Oh, and on top of the above add in storage in uncontrolled environments and the likelihood of being pressed into service without inspection/cleaning we'll toss in insect & rodent intrusion.
Having the HVDC ground plane with a raised resistance level will help in current limiting so double/triple insulated . Using an instant acting C/B's, GFI or arc detection, along with a current limiting fuse to catch leakage and runaway arcing... hmnn, maybe we should be looking at used 600VDC solar gridtie modules for their safety products..