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I have 12v peltier modules that I wish to run as a heater and ac unit but they have have a limit of like 27ma I have tried plugging then directly into a 2a car cigarette lighter adapter and they instantly got scalding hot on both sides so I figure it must be the amperage flow How would I go about reducing the current enough to let this run continuously on 12v without risking damaging more cells in the process...

The intent right now is for heating a van but would hate to destroy the cooling functions of it...I do plan on mounting a cpu fan to this to dissipate heat as quickly as possible.I have successfully used these running off an 18650 cell directly with a cpu fan for about 1hr as a personal body temp control in the summer, only being moderately too cold for continuous direct contact with the skin to be comfortable but kept me feeling good in 100¤ weather when kept on my wrist.

Are these typically only run by some sort of smart switching mechinism in conjunction with a thermostat or what?

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  • \$\begingroup\$ well, you'll probably first have to buy a new one. \$\endgroup\$ – Marcus Müller Nov 24 '16 at 23:51
  • \$\begingroup\$ I have two others already \$\endgroup\$ – Firobug Nov 24 '16 at 23:51
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    \$\begingroup\$ ok, but seriously, 27mA is very little, and I don't know what they're supposed to deliver, but given an efficiency of much less than 10% for Peltier elements, I'd say you might be in for a disappointment. \$\endgroup\$ – Marcus Müller Nov 24 '16 at 23:52
  • \$\begingroup\$ What exactly are the specifications of the Peltier modules? Also how big (as in actual size) are they? \$\endgroup\$ – immibis Nov 25 '16 at 1:07
  • \$\begingroup\$ Apx 1 3/4" squared... \$\endgroup\$ – Firobug Nov 25 '16 at 4:07

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