This is a reasonable desperation setup for emergency power, but not a great off-grid solution.
Highway cruise for a compact car needs around 7 to 20HP, so a reasonable target output is in that range. That's 5 to 15 KWh. Seems small, but as others have pointed out, auto engines have peak outputs far beyond their continuous rating.
1800 RPM 60Hz generators are available, and larger generators tend to run at 1800 RPM.
Or you could do something with belts or gears to keep the engine RPM down, as others pointed out. Running at low RPM is good if you want to run for a long time.
Probably a good idea to have the system disconnect output power until the frequency reaches at least 50 Hz, because this thing needs quite a while to reach operating frequency. Bringing up something like a refrigeration compressor (a likely emergency load) from 0 Hz to 60 Hz over the course of a minute may burn it out. Under-frequency operation is very bad for AC motors; they draw way too much current and overheat, because the inductance of the motor isn't able to oppose the lower frequency. Put an ohmmeter across an AC motor and note how low the DC resistance is.
Highway cruise for a compact car needs around 7 to 20HP, so a reasonable target output is in that range. That's 5 to 15 KWh. Seems small, but as others have pointed out, auto engines have peak outputs far beyond their continuous rating.
1800 RPM 60Hz generators are available, and larger generators tend to run at 1800 RPM. Or you could do something with belts or gears to keep the engine RPM down, as others pointed out. Running at low RPM is good if you want to run for a long time.
Probably a good idea to have the system disconnect output power until the frequency reaches at least 50 Hz, because this thing needs quite a while to reach operating frequency. Bringing up something like a refrigeration compressor (a likely emergency load) from 0 Hz to 60 Hz over the course of a minute may burn it out. Under-frequency operation is very bad for AC motors; they draw way too much current and overheat, because the inductance of the motor isn't able to oppose the lower frequency. Put an ohmmeter across an AC motor and note how low the DC resistance is.