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Hooking up 100 watt off road lights

Posted By W921 Last Month
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rubbishman
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Geoff Weeks (1/5/2020)
There are many mfg and levels of quality. The 5 terminal "Bosch" relays are good. So are the bigger more "clunky" Delco relays used until the 80's.  

I found one of those Delco type  Cole-Hersee headlight relays on ebay for the Per-Lux lights which are 100w sealed beams.



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Geoff Weeks
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There are many mfg and levels of quality. The 5 terminal "Bosch" relays are good. So are the bigger more "clunky" Delco relays used until the 80's.  
Aaron
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I don't like those little plastic releys, they are plastic junk, you have 3 or 4 blades that plug into a plastic connection this leaves lots of room for corrision the Ford type constant duty solenoid is pretty much fool proof, the draw back being you need more space to be able to put them and get to them should you need to.


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Geoff Weeks
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Tony Bullard (1/5/2020)
Geoff Weeks (1/5/2020)
30 amps @ 14,2 volts is 1420 watts, that relay will be plenty.


Or another way to look at it is 100 watts @ 14.2 volts = 7.04 amps. A 10 amp relay would do the trick. I don't know if they even make automotive relays that small. Stick with the 30 amp.


Yeah, but two lights double that to just over 14 amps. Be sure to use heavy enough wire.
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Geoff Weeks (1/5/2020)
30 amps @ 14,2 volts is 1420 watts, that relay will be plenty.


Or another way to look at it is 100 watts @ 14.2 volts = 7.04 amps. A 10 amp relay would do the trick. I don't know if they even make automotive relays that small. Stick with the 30 amp.



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jimfols
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Here's a handy calculator.
https://www.supercircuits.com/volts-watts-amps-converter


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W921
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Thank you
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30 amps @ 14,2 volts is 1420 watts, that relay will be plenty.
W921
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I want to hook up a pair of 100 watt off road lights. My question is should I use a 80 amp continuous duty solenoid instead of a 30 amp relay? I'm sorry if this is a stupid question but I have never hooked up 100 watt lights before and there isn't really anybody else I can ask.


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