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I agree that the D722-E is a three cylinder engine. Also in the specs I found, it's rated around 18 hp at 3600 rpm. If the generator you have needs to be turned at 1800, that engine won't even come close to handling the job unless you use something like belts and pulleys so the engine can run...

With 100% efficiency, you'd need 16.02 hp. Assume you'd need at least 20. A bit more is good.