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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > figuring how big of a fuse
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Author Topic: figuring how big of a fuse  (Read 748 times)
robin
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Hardwick NJ
« on: February 18, 2016, 01:20:43 PM »
My son installed some led lights on his truck and i told him he needs to fuse them,how do i figure the right size fuse to go with in simple terms please.
  The two lights are 18 watts apiece.

   Thanks, Robin
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hubcapsc
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upstate

South Carolina
« Reply #1 on: February 18, 2016, 01:29:59 PM »
http://www.tecks.co.uk/technicians/healthandsafety/calc.html
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robin
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Get on it and RIDE!!

Hardwick NJ
« Reply #2 on: February 18, 2016, 01:36:18 PM »
Still greek to me Mike
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The emperor has no clothes
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« Reply #3 on: February 18, 2016, 01:42:17 PM »
36 watts total divided by 12 volts = 3 amps. I would go with a 4 amp fuse. (At least that's how I figure it)
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WintrSol
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Florissant, MO
« Reply #4 on: February 18, 2016, 02:07:53 PM »
Quote from: meathead on February 18, 2016, 01:42:17 PM
36 watts total divided by 12 volts = 3 amps. I would go with a 4 amp fuse. (At least that's how I figure it)
:cooldude:If 4A is not available (non-standard size), go no higher than 5A.
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Gryphon Rider
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2000 Tourer

Calgary, Alberta
« Reply #5 on: February 18, 2016, 02:47:00 PM »
Watts ÷ Volts = Amps
Amps x 1.2 = calculated fuse size
If there is no fuse exactly at the calculated size, use the next higher fuse size.

ATC (medium) and ATM (small) fuses come in the following ratings:
3A
5A
7.5A
10A
15A
20A
25A
30A
35A (ATC only)
40A (ATC only)

per meathead's calculations:
36W ÷ 12V = 3A

fuse size:
3A x 1.2 = 3.6A
There is no 3.6A fuse available, so use next higher 5A rating.

AGC 1/4" x 1-1/4" cylindrical glass fuses come in more ratings, e.g. you can get 4A fuses from electrical suppliers.
« Last Edit: February 18, 2016, 02:55:30 PM by Gryphon Rider » Logged
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