The chorehorse output was 300W, only 1/10 that given above, as well the later (postwar?) chorehoses were 24V system (and I think the earlier ones were 12V but am not sure). I don't know what Briggs & Stratton engine would have been used for a 3KW output, maybe a nominal 8 horsepower after allowing for losses in generation. I got your PM but have not yet put together an answer.
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