I have a firewood processor that can be powered via an 11kw electric motor however it states the minimum pto to be 30kw. Both turn the same 3 hydraulic pumps. The elec motor directly at about 1500 rpm & the pto at 540 rpm but with a 3 to 1 gearbox to increase the rpm. I wish to power this either directly from an engine with a 2 to 1 reduction or with a 5 or 6 to one reduction into the pto input. How can the power needs be so different from pto to electric? What will the minimum engine hp I can use?