Buying an electric vehicle is not a good way to save money
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Maybe I'm stupid but why don't they have alternators and charge their own batteries?
You are thinking of a hybrid that has a gas engine to drive the alternator to charge the battery part. The battery and electric motor helps with acceleration and stop/go traffic, improving range tremendously. The gas motor helps with driving at speed and keeping the battery charged.
A pure electric car has no way to charge the battery other than regenerative braking.
What would drive the alternator? An electric motor? The output energy of the alternator would not equal the input energy due to resistance causing loss
I have been saying this for years. I think the answer is - it would be free energy and that is not allowed. Instead of the engine charging the alternator, connect to wheels for rotation. 4 wheels = 4 alternators.
Attaching alternator to the wheel adds resistance, the energy captured by the alternator would not be greater than (or even equal to) the energy lost in resistance
Three laws of energy. 1 You can't win. 2. You can't break even. 3 You can't leave the game.
Hey hey! free energy is real, see this:
https://mathscholar.org/2019/03/lenr-energy-science-or-pseudoscience/
And the work of Tom Bearden (RIP) on http://cheniere.org/index.html