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Most of the TEC's need a 100' differential. put a nice HEATSINK on the cool side and have it in the "airstream" and you will EASILY have a bit more than the 100' you need for temp differential.
one side does NOT need to be cold. it just needs to be far enough temp differential. so if one side is 600's and the other side is 400's you have your differential and your making amps.
though they are rather expensive.
There is pretty much no "real" dot regulations for non visible bulbs. IE tail lights turn signals etc..
for headlights YES dot regs are a minor issue. I don't really care about dot regs as far as "lawbreaking" goes but I DO care about them as far as keeping ME and other drivers safe.
SO when I figure out how to go LED headlights I plan on jump through the DOT regs as needed to make it right.
A deep cycle battery TODAY has more CCA than a STARTER battery from years past. especially NICE Deeps like Optima's
my optima marine blue top deep cycle starts my car better than the "regular" starter battery I removed from it.
but remember I am driving a 3cyl metro. a lawn tractor battery is good enough for this. a gel cel from a emergency light is good enough for this (yes tried and tested)
these cars just don't consume all that much power. I think I totaled my power consumption at 10 to 30 amps depending on lights on or off
Just changing out all the little bulbs to LED should get me closer to 20amps lights on. 15 if I can figure out how to go "LED" for the headlights.
ie all led with 2 decent deep cycles (twice the CCA BTW) and I could go a week between "charges" without going below 50% SOC on the batts
add a solar charger and in the summer I won't even have to plug it in at all to recharge as long as I park in the sun.
I DO plan to look into isolating one battery when "engine off" so if I good and leave something on I have one full battery at least :-)
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