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I have procured a thermoelectric cooler (TEC, this one) and my purpose of the TEC is to produce current for the Li-poly RC battery to increase its battery life. The Li-poly RC battery has 7.4V stated on the battery itself.

  • Am I supposed to get a DC DC converter?
  • And how to go about assembling the TEC to the battery?
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  • \$\begingroup\$ Could you please expand on your theory how do you plan to use the TEC element to prolong the battery life? \$\endgroup\$ – Ale..chenski Feb 10 at 6:30
  • \$\begingroup\$ You'll need a battery charge controller, as well as a power source such as the DC-to-DC voltage converter you suggest. \$\endgroup\$ – DrMoishe Pippik Feb 10 at 7:00
  • \$\begingroup\$ You'll need an 'energy harvesting' grade DC-DC converter, that is, one that will handle the very low voltage produced by Peltiers (look at Texas Instruments and Analog Devices, both make them) and a charge controller for the cells. \$\endgroup\$ – Neil_UK Feb 10 at 7:50
  • \$\begingroup\$ @Neil_UK thank you!! Will I need a voltage regulator as well? \$\endgroup\$ – tingyin Feb 10 at 7:58
  • \$\begingroup\$ You need a LiPo that can supply 61W of power at 15.7V with another 8W CPU cooler fans with same heatsink to achieve 31W of cooling so 1 hr x 15.7 V x 3.9A = 61Wh but 4SxP array @ 4x3.7 only 14.8V down to 4x3V=12V \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Feb 10 at 8:04
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You need an MPT converter + LiPo BMS + a thermal delta T power source to harvest the energy in a firm but not over stressed mechanical design.

The temp drop must be maximized while staying within limits to maximize current source with its intrinsic internal ohmic resistance.

In other words, you challenge is get a hot-side heat exchanger, a cold-side heat exchanger, your TEG, a compression assembly system design then an MVPT charger that does impedance matching and tracking for desired output electrical power transfer charger in CC, CV and cutoff modes.

Or in other words buy what you need to match your yet to be defined power, thermal energy transfer design, voltage, current specs, impedance for all input AND outputs in each “state” or mode of operation.

MVPT

e.g. https://thermoelectric-generator.com/product/10w-teg-mvpt-battery-charge-controller/.

Overall it can save fuel, but still a great challenge for Design Engineers. But what you need to learn is beyond the scope of this answer.

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