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Powering a 12V fan off a car battery

Hello! First off I am new here and will probably get a few things wrong. However, I need a little help. I have a unique situation where I need a noctua fan as well as some Peltier coolers running for a long time from a Lead acid battery. What circuitry would I need to put in so that these small components aren't turned into a puddle of plastic and metal?

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Define a long time? PC fans generally don't draw much, but a peltier can, depending on it's specs. 

 

As for what's needed? It's a 12 volt fan right, 12 volt battery, hook them up, no issue. Actually oddly enough on one of the motorcycle forums I frequent a "common" mod is using PC fans as radiator fans.

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