Quote:
Originally Posted by azfordman
Any ideas of how large of a fuse I should be running? I've tried several local parts stores and no one seems to know. The relay is 50 amp. I have no idea what the fan is out of or what it's specs are, it is only marked with a 12v sticker.
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A 50 amp relay is fine. Regarding your fans, most of the larger puller fans draw in the neighborhood of 15 amps at 14.6 volts (that's what my large heavy duty puller fan pulls). My pusher fans draw 10 amps at 14.6 volts. As your voltage goes down (like to 12 volts) the current will go up. The initial draw of current to motor driven devices, like fans, will surprise you. It is often three to four times the regular amperage draw. When I throw all of my fans on at the same time I get a momentary amperage in the low 90s. That doesn't last long enough to blow a fuse though (and I use a circuit breaker anyway).