The 80 volt voltage regulator isn't a great problem with solid state. So long as the field control transistor can handle the voltage, a couple resistors can lower the high voltage down to a handy voltage for comparison. I built one for a turbine on a steam locomotive, used a power fet for the pass transistor for the field, and used a resistor to turn the FET on. Then I hooked up a TL431C programmable zener diode to shunt the gate drive to the fet when the sample voltage exceeded the internal reference voltage of 2.5 volts in the TL431C. Its worked for several years now.
Ford Rangers are quite a bit larger than they used to be. Half ton pickups have grown unreasonably large, as big as a 1 ton.
Its very hard to get economy without reducing weight, and lead acid batteries are the heaviest, but still about the most practical when you have to pay for them, though their energy density is much lower than the fancier technologies. Edison cells aren't all that bad, but are hard to find these days. They tend to not wear out and that has put the companies making them go out of business.
Controllers should be switching to keep the controller efficiency very high. And that's fairly new technology, but not horribly new.
Most mechanical variable speed drives are inefficient or fragile or both.
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