Yes, You are absolutely right. In my country it is close to impossible to register full electric car. But hybrid is allowable. And if I can take 100-120 kg of lead acid acu on board, this should give 30-40% of total energy needed for my trip.
Ic engine is left in place. It should give adequate acceleration with even small e. motor.
And more - simple way to do such an upgrade, run alternator as a motor with some kind of brushless controller. Again - it does not need to start from zero rpm. Going alternator less, got 7-8 % of better mpg in my case. By running it as a motor - we could double it. So it should be more like 14-16 % in my case..
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