Quote:
Originally posted by Brians256
Yes. Or you could run the TECs in parallel off of a single PSU at their much reduced 50% of Vmax. Instead of getting 24V, each would get something like 12V (TECs are non-Ohmic devices so they don't really act like resistors).
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Did you mean 'series' instead of 'parallel'?
If you run the two TEC's in parallel, the voltage applied to each TEC will be the full output of the supply. (Neglecting voltage drop in the hookup wires.) If the TEC''s are hooked up in series, the output of the supply will be divided between them, but not necessarily equally.
For rough power requirement calculations you can calculate a resistance for the TEC. It won't be that accurate, but a 20% margin on the supply's current rating will cover the error for normal applications.
So, just dividing Vmax/Imax...
R226 = 15.2 / 24 = 0.633 Ohms
R80 = 16.1 / 8 = 2.01 Ohms
If these two TEC's are connected in series across a 24V supply, the voltage across the 80 Watt TEC would be:
V80 = 24V * 2.01 / (2.01 + 0.633) = 18.25 Volts
V226 = 24V - 18.25 Volts = 5.75 Volts
So you would have much too high a voltage across the 80 Watt TEC, and much too low a voltage across the 226 Watt TEC.