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hi current needed
most new er cars need
minimum of 10 to 20 amps to run the engine and DRL with out much else
at full loads with AC and wipers and high beams most cars are approaching
100 amps
and many of the big SUVs are considerably over that
which is why the ECM has control of charge rate ... so it can minimize alternator load on the engine when not needed
so
you have chosen a pathway that will present a considerable challenge
.................
fresnel lenses can produce upwards of 2000f at the focal point .... that would be dependent on the sun and its relative position to the TEG and lens ... which would be in constant flux in a car
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