Cigarette lighter capacities - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 8 (permalink) Old 10-23-2005, 04:52 PM Thread Starter
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Im about to hard wire an inverter into my 6 and plan on using the leads for the cigarette lighter. The inverter is 400 watt continuous and 800 watt max which will draw 33 and 66 amps. I know the wiring isnt rated for this. I want to upgrade the 15 amp fuse that the lighter uses now but i dont want to fry the wiring. how big can i go? also, is the cigarette lighter in the arm rest always on? or is it switched with the ignition?
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post #2 of 8 (permalink) Old 10-23-2005, 05:49 PM
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I don't know about most of your questions but I do know the lighter is switched with the ignition.

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post #3 of 8 (permalink) Old 10-23-2005, 07:57 PM
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Check the fuse in the fusebox and you will find your answer. I've never looked or I'd just tell you.

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post #4 of 8 (permalink) Old 10-23-2005, 10:14 PM Thread Starter
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the fuses are 15 amps for each of the lighters. but i know the wiring can handle more.....but how much more?
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post #5 of 8 (permalink) Old 10-23-2005, 10:20 PM
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maybe this could help you. i dont want to shit on your grass but it's not as easy to say "how many amps in a volt" read this and this will tell you everything you will ever need to know about everything!



What are amps, watts, volts and ohms?

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post #6 of 8 (permalink) Old 10-23-2005, 10:53 PM Thread Starter
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im an engineer, i understand electricity. my inverter is 400 watt continuous and 800 watt max. on a 12 volt circuit (i know its actually closer to 14.4v) that will draw approximately 33 and 66 amps. P=VI. I guess i could look up the gauge wire and see what that is rated but there really is no way i can trace all of the wires to find their gauges as well as all of the connectors. maybe i will just run wires directly from the battery so it will be always on and i know i wont light my car on fire.
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post #7 of 8 (permalink) Old 10-23-2005, 10:58 PM
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I would just run new wires to the battery and your own fuse. That way you are safe and you still use both lighters. Just add a switch in the line to disable the inverter, if it doesn't have a switch already. 10awg should be more than enough.

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post #8 of 8 (permalink) Old 10-24-2005, 03:37 AM
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I have a 350W inverter, then it was fully loaded on holiday this year (it beeps when its overloaded and it was occasionally beeping), after 5 hours it blew the cigarette lighter fuse !

So I am running a dedicated supply to a secondary cigarette lighter for my invertor from now on.

Nige.
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