You are entirely correct, Paul. When it comes to moving energy around a system there is no free lunch - you can never get out more than what was put in. When dealing with continuous, high power applications it is impractical to carry the necessary energy in batteries. A little simple math shows that for a 100 hp tractor (75 kW) running at just 50% average load for ten hours would require a battery capacity of nearly 400 kW-h. This is four times the capacity of the largest battery available for the Tesla S and would weigh several tons. There is also no free lunch at the other end of the system when the battery has to be recharged. You'd need to hook up to a 480 volt, 100 amp supply for ten hours to transfer this much energy from the power grid to the the battery. And this is all for just 50 horsepower of work output for one day - for a large farm tractor or combine doing serious work multiply these numbers by at least 5, if not 10.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for �200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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