I bit the bullet and bought a cheap generator, figuring that I wouldn't be
using it more than a couple of hours per year and even then only to drive a
gas furnace blower.
After playing with it for a couple of days, I'd be interesting to know how
it's "performance" stacks up considering the following.
It puts out between 121-125 volts no load... 60.5 to close to 62 hertz.
With a 1500 watt load, it runs around 118 volts, 59-60 hertz... switching
the load and on ever 30 seconds or so has no effect on the output...
It handles a 6000 but air conditioner well, staying around 118 volts when
run normally, no problem with start up.
When the AC unit is cycled off and then back on quickly, the voltage drops
to around 90, and stays there for minute or so, then catches up and runs
around 118 volts ( when I've pulled this same trick on the house wiring, it
almost always blows the breaker).
The unit is rated at 2500 watt continuous.