because of this the PSU needs to be able to withstand the 20A that is being drawn by the TEC 50% of the time even though that switching frequency in the TEC is over 2000 times a second?
Say that the TEC I am going to use draws 20A at 12V.If I run a 50% duty cycle on the PWM then the the TEC will be as if it is working at 6V 10A.
will this method require cooling of the FET I might use
"N-channel MOSFET 96A 100V TO220 IRFB4410"
Quote"N-channel MOSFET 96A 100V TO220 IRFB4410"This is not a logic level FET and so can't be driven directly from the arduino. You either need a logic level FET or you need to boost the arduino's 5V output signal to at least 10V with a transistor or another FET.