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Old 09-02-2014, 05:28 PM   #1
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Watts and amps

I'm not the best with amps and watts but can a 117 amp alternator handle 3 55 watt driving lights or will the alternator have to be upgraded as well
Thanks
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Old 09-02-2014, 05:35 PM   #2
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No problem at all with three 55 watt driving lights. All three would only draw roughly 14 amps total.

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Old 09-02-2014, 06:55 PM   #3
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Thank you very much
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Old 09-02-2014, 07:29 PM   #4
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Volts X Amps = Watts

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Old 09-02-2014, 09:50 PM   #5
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So 12v x 165 watts = 14 amps
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Old 09-02-2014, 10:25 PM   #6
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165 watts (3x55 watt bulbs) divided by 12 volts equals (roughly) 14 amps.
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Old 09-02-2014, 10:26 PM   #7
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Quote:
Originally Posted by Tj888 View Post
So 12v x 165 watts = 14 amps
Really ????

12 volts x 13.75 amps = 165 watts

OR

165 watts / 12 volts = 13.75 amps
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Old 09-02-2014, 10:34 PM   #8
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If you really want to get technical you'd actually be at about 12.6 volts with the engine off and 13.6 with the engine on, which would give you 13.1 amps and 12.1 amps.
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Old 09-02-2014, 10:49 PM   #9
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Sometimes the simplest answers to simple questions get dragged down to places they never deserved or needed to be at. Next someone will be throwing in the driving lights bulb's negative temperature coefficient and start plotting the precise amperes drawn by the bulbs over time. Once in a while I just hate the internet.
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Old 09-03-2014, 12:46 AM   #10
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Quote:
Originally Posted by Jerry Bransford View Post
Sometimes the simplest answers to simple questions get dragged down to places they never deserved or needed to be at. Next someone will be throwing in the driving lights bulb's negative temperature coefficient and start plotting the precise amperes drawn by the bulbs over time. Once in a while I just hate the internet.
Not to mention humidity impacts... or accounting for solder resistance x number of splices or maybe the vehicular orientation with the earth's magnetic field...
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Old 09-03-2014, 01:33 AM   #11
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And let's not forget the flux capacitor. 8.8 gigawatts is like 20 amps. 👍
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Old 09-03-2014, 05:43 AM   #12
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Easy guys I'm just trying to get it right lol
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Old 09-03-2014, 01:16 PM   #13
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Sorry, I couldn't resist. Your alternator will more than handle your lights. A standard house only uses about 100 amps. You will be fine
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Old 09-03-2014, 01:50 PM   #14
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Wow, all I did was throw the equation out there. Turned into an algebra / flux capacitor / Weather Channel thing. Always fun here. Regards
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Old 09-03-2014, 02:30 PM   #15
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Quote:
Originally Posted by mgagerjr View Post
Sorry, I couldn't resist. Your alternator will more than handle your lights. A standard house only uses about 100 amps. You will be fine
A house may use 100 amps at 240V/120V, but that is not the same amount of work as an alternator supplying 100 amps at 12v... You could not run your house off an alternator.

Sh*t, my gaming rig power supply puts down over 100amps on the +12v and +5v rails alone.
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Old 09-03-2014, 03:10 PM   #16
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100 amps is the *minimum* household requirement of most states. 200 is much more typical.
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Old 09-03-2014, 04:32 PM   #17
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It's ok I knew it was joking
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Old 09-03-2014, 04:54 PM   #18
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Wait... I want a spot light powered by a solar panel, to shine at the solar panel to power the spot light to shine at the solar..........
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Old 09-03-2014, 05:47 PM   #19
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E= mc2
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Old 09-03-2014, 07:00 PM   #20
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Quote:
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Wait... I want a spot light powered by a solar panel, to shine at the solar panel to power the spot light to shine at the solar..........
What? Lol
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Old 09-04-2014, 05:36 AM   #21
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Quote:
Originally Posted by Jerry Bransford View Post
Sometimes the simplest answers to simple questions get dragged down to places they never deserved or needed to be at. Next someone will be throwing in the driving lights bulb's negative temperature coefficient and start plotting the precise amperes drawn by the bulbs over time. Once in a while I just hate the internet.
....not sure "driving lights bulb's " has the proper possessive form...
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Old 09-04-2014, 10:20 AM   #22
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And now a grammar thing. Regards

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