OHMS LAW states amps x volts = watts. Thats all I can tell you. I get the "Will it wun my AC?" everyday. I wouldnt know unless the answer to this formula is less than the generator power. I know my Honda ex650 will run my 52" Toshiba Big Screen.
I have been an EE for almost 20 years. Ohm's law is always true, but a compressor has a heavy amp draw when starting, and will often pop a breaker. If the running Amps are say 15, the inrush amps could be say 60 or higher, but only for a fraction of a second, but enough to trip the breaker.