I guess it is crest factor, but I say it is necessary.
en.wikipedia.org
What I'm referring to is that at high current, capacitors in inverter do approximately nothing for 60 Hz current draw by a single (or split) phase inverter. The entire 60 Hz current draw comes from the battery, dropping to near zero twice per cycle. A 3-phase inverter with uniform loading on all phases would not do that.
With say 5kW coming from a 50V battery, that is 100A mean. But it is 111A RMS. If you size your fuse based on the mean current, wattage delivered divided by voltage, it will use up almost half of the 25% oversize normally allocated because the current is a rectified sine wave and will heat the fuse more than DC would have.
This is something I figured out from measurements, have not seen it addressed elsewhere. I do have a habit of figuring out what experts, even teams of experts, have missed.
After reading of someone tripping battery breakers at well below rating, I realized that could be due to pulses of current drawn by the inverter. Ideally capacitors would smooth out current draw so high frequency switching pulses and 60 Hz draw all came from the caps, and current from batteries...
diysolarforum.com
An extra 1.12 multiplier is my contribution to the art.