I wonder if Onan could make a model with a PSW inverter and variable speed (like eco-throttle), but either have a battery (or a supercap when that technology gets down the road a bit) or use the house batteries to handle the inrush current from compressors until the engine can get up to speed.
Of course, one could see about having the generator always keep a lithium-ion battery bank charged and have a PSW inverter on that. The result would be extremely clean power until the inverter was at its limit regardless of how fast the generator's crankshaft was spinning.
