Between .7 and .8 for most "ordinary" switched power supplies.
An "honest" generator rating from cheapo generator manufacturers? Stop! You're killing me! Things got so bad in the small engine horsepower data ads that reputable manufacturers now refuse to imply "horsepower" ratings.
I've laid in an order for a 50uf 480 volt RUN capacitor to take with me to my instrumentation. A scope capture order will reveal voltage droop through a current transformer to determine just how effective or ineffective connection of a RUN cap is, before actually enabling a switching power supply.
Of course, I could guess, by monitoring instruments but power supply electrolytic capacitor inrush is so fast it is elusive to the eye. But it sure isn't "elusive" to a marginally powered generator.
