If he wants to run them in series then it would be the 3 TEC's across 24 volts.
each one drawing 8 volts.
if @ 12volts there is 5.96 Amps(A)
then @ 8 volts there is 3.97 A across each TEC
since you have 3 of them you need a powersupply that can support 11.92 or 12A.
now would that be 6A from the positive and 6A from the negative?
only thing I'm not shure about is if the calculation to dertermin the initial Amps is correct... does it scale linerarly?
my 2ยข
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