FYI
If you're not wanting to build it yourself .. the TEG modules, heat sinks , etc .. but have some cash to burn .. you can just buy the TEG device .. ~80% pre-done/made .. just have to install and plum coolant.
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Hot Air / Cold Liquid.
Plum the coolant to a radiator.
TEG-HL350-48V
~350W electrical output .. if ~300Celcius Hot (400C max) and ~50Celcius Cold .. ~3 Liters per minute coolant flow.
18.8kg
500mm x 151mm x 259mm
48VDC nominal .. 96VDC Open Circuit
$6,000 +Shipping for 1
$3,000/ea +Shipping for 10+
$1,500/ea +Shipping for 50+
$1,300/ea +Shipping for 100+
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Or .. just a hot plate to cold liquid .. need to attach the plate to exhaust , and run the coolant to a radiator.
TEG-HL100-12V-2
~100W electrical output
@ ~270C Hot ~30C cold ~2.8Liter per minute
3 kg
302mm x 150mm x 58mm
12VDC Nominal 24VDC open circuit
$600 +Shipping for 1
$300/ea +Shipping for 10+
$250/ea +Shipping for 50+
$220/ea +Shipping for 100+