Posted by janicholson on November 02, 2011 at 19:18:10 from (96.24.99.126):
In Reply to: electrall question posted by Charlie M on November 02, 2011 at 18:04:37:
The following is my opinion. The use of electricity to power major implements is a compromise. A generator of the era might have an eighty 80% efficiency on a proper resistive load with everything adjusted correctly (optimistic value). couple this with the 75% efficiency of the Motor or actuator on the implement, and you were down to just more than 60% real transfer of power. The generator is heavy and in the visual path of some tasks. The system was not "live" being driven from the belt pulley it stopped or slowed when clutched. A trailer driven generator would be live (on an SMTA or newer 300 or larger series, but that precludes the use of an implement. The price would also have been dramatically more than a PTO shaft, which has a transfer of power of 97% running straight. Farmers of the era were also not prone to go where no farmer had been before. Electrical things were not beyond them, they were mostly small motors and lights, not 10s of HP and higher voltage. Savy farmers purchased many trailer based Electrall systems to provide emergency capacity to milk, run the furnace, and the barn cleaner. They still use them for that with great success. Opinions will surely vary on this topic. Jim
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