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Originally Posted by ISoar
Also, if the Pelt power source is a distance away from the Pelt (like mine is). The longer the wire, the greater the voltage drop! Using thicker wire compensates (lower resistance).
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Btw, this is also where a power supply with remote sensing wires comes in handy.
For those that didn't know what the S+ S- connections were for, and why they are shorted to V+ V- on most supplies ...
The higher the current draw, the greater the voltage drop for a given resistance (Ohm's law: V = IR).
The remote sense wires carry a very low current, typically 10 mA or less, so the resistance of the wire connected to them is less critical, though they have to be shielded. The remote sense connections should be hooked up as close to the Peltier as possible. Doing this causes the power supply to ignore the resistance of the high current providing wires! Essentially the remote sensing cause the supply to put out a bit more voltage to compensate, so the Peltier gets all the power it craves!
When the Peltier is close to the power supply, the remote sense connections shorted at the supply are adequate.