my dad wants to know this for a wind generator
multiply the car alternator's rating (in amps) by its voltage, about 14 volts nominally...light cars and trucks are rated 50-70 amps.
...so thats 700 to ~1000 watts.
Divide by 110 (rms) volts, which is the same energy as 110v dc...and you get 6.4 to 9.1 amps at 110 VAC.
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This is of course not taking into account for inverter losses.
Indeed, thankfully good inverters, smps, and dc boost and buck converters mostly run in the 90+% range.