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What size relay do I need?


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bdizzle
New User

Sep 2, 2016, 11:55 AM

Post #1 of 2 (795 views)
What size relay do I need? Sign In

I am installing four of link deleted ... not allowed to my 2012 Jeep Wrangler Unlimited. They are 12v 40w each. I would like to connect them all to one relay, and thus one switch. Will a 40 amp relay do the trick? Total newbie here - if possible could you explain the calculation/math that answers the question yes or no so that I don't have to bother anyone with this type of question in the future? Thank you so much!

(This post was edited by Hammer Time on Sep 2, 2016, 1:02 PM)


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Sep 2, 2016, 12:12 PM

Post #2 of 2 (791 views)
Re: What size relay do I need? Sign In

P=I*E
40=I*12.6V
I=3.17A

3.17A*4=12.17A

A 40 amp relay would be more than capable of handling that.





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