If you could get a mechanical inverter to work for a max of 100 hrs using new electrode technologies... you should be able to make it small enough.I'm talking spin switched.
In short, My question is, electrodes are getting extremely good maximizing conduction and minimizing wear, but are they good enough to make mechanical switching a possibility?
Say funnel a MAX of say 20 amps @ 12vDC to a spin a high efficiency brushless DC motor nice and fast. The DC motor would be attached to a plate that would have a Rotating I (maybe an X?) of High tech carbon nanotube ended graphene electrodes spining in a circle. Spinning at the right frequency, it should convert the DC to square AC. Round it out, and then a computerized Vmeter + tied back to an ESC could regulate the motor's speed keeping the phase locked good n tight, minimizing fluctuations.
I'm not an EE though, I feel like there's something wrong w/ this, that the loss might be too high, or maybe that kind of electrode technology isn't there yet?