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A simpler solution using relays is to use one double pole change-over relay.  Cross connect the  NC and NO pins on each pole so activating the relay reverses the polarity from a single power source. It is much simpler and cheaper than using two relays and two power supplies.



But is the Peltier isolated from its environment?  In practical applications it would be heating or cooling something else and you need to consider the heat 'flow' in and out of that too.


Brian.


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