How much power do Peltier thermoelectric modules generally produce? Is it likely to be enough that a load of them could be attached to the exhaust system) (and other hot bits) of a car, in order to partially supply the electrical system?
-I appreciate this adds weight to the system - which means fuel is expended in just carrying the equipment around*, however, a decreased load on the alternator should result in better overall fuel efficiency - and the modules themselves would be running on energy that is otherwise simply thrown away.
Do they generate power in sufficiently appreciable amounts to make this even a tentatively worthwhile idea? - bearing in mind also that (I think) much of the weight of hobbyist-available Peltier modules is made up of metal heatsink plates, whereas in this application, they could be coupled directly to the metal of the exhaust - at least on the hot side.
*(So if your answer is going to be something to the effect that this would violate the laws of thermodynamics, you haven’t thought it through properly - they cost more to carry around, but it isn’t the simple act of carrying them that generates the power)