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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 02-28-2011, 02:22 PM
Huncowboy Huncowboy is offline
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How many amps is the 12V lighter outlet? Anyone?

It is not in the manual. All it says is 12V. I have an electric air pump for the tires that keeps blowing out the fuse. The manufacturer says it may be because the car is only 10 amps.

Can anyone tell me how many amps is the outlet? Thanks!
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  #2  
Old 02-28-2011, 02:44 PM
tunafish tunafish is offline
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Quote:
Originally Posted by Huncowboy View Post
It is not in the manual. All it says is 12V. I have an electric air pump for the tires that keeps blowing out the fuse. The manufacturer says it may be because the car is only 10 amps.

Can anyone tell me how many amps is the outlet? Thanks!
When you replace the fuse, what is the number written on it?
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  #3  
Old 02-28-2011, 02:59 PM
Quacker Quacker is offline
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The owner's manual claims 200W, which is almost 16 amps at 12.6V - a typical resting voltage for a charged battery.
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  #4  
Old 02-28-2011, 04:41 PM
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1HOT BMR 1HOT BMR is offline
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Quote:
Originally Posted by Huncowboy View Post
It is not in the manual. All it says is 12V. I have an electric air pump for the tires that keeps blowing out the fuse. The manufacturer says it may be because the car is only 10 amps.

Can anyone tell me how many amps is the outlet? Thanks!
I connect the air pump directly to the battery with one of these:

http://www.amazon.com/Roadpro-Batter...8939939&sr=8-4
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  #5  
Old 02-28-2011, 05:21 PM
Huncowboy Huncowboy is offline
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15 amps
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  #6  
Old 02-28-2011, 06:48 PM
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markl53 markl53 is online now
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Other electrical items in the car may be on the same circuit as the outlet. What is the rated wattage or amperage of the air pump, that is the important question. The electrical formula is P=E*I, where P=wattage, E=voltage (12V) and I=amperage. If the pump pulls 5 amps, at 12 volts you are running 60 watts. Knowing two of the variables you can figure the 3rd by re-arranging the factors in the equation. Meaning, I=P/E, etc.
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Last edited by markl53; 02-28-2011 at 06:50 PM.
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  #7  
Old 03-01-2011, 04:55 AM
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Needsdecaf Needsdecaf is offline
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Quote:
Originally Posted by markl53 View Post
Other electrical items in the car may be on the same circuit as the outlet. What is the rated wattage or amperage of the air pump, that is the important question. The electrical formula is P=E*I, where P=wattage, E=voltage (12V) and I=amperage. If the pump pulls 5 amps, at 12 volts you are running 60 watts. Knowing two of the variables you can figure the 3rd by re-arranging the factors in the equation. Meaning, I=P/E, etc.
No, ahhhhhh!!! No electrical equations! "C is for circuits, C is for circuits...." (the chant of the Fundamentals of Engineering exam student).
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Old 03-01-2011, 08:17 AM
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Originally Posted by Needsdecaf View Post
No, ahhhhhh!!! No electrical equations! "C is for circuits, C is for circuits...." (the chant of the Fundamentals of Engineering exam student).
LOL. I have a "thing" about memorizing. For some reason I always have remembered P=E*I and E=I*R from my high school electricity class! Hey, I also know the resistor color band motto: "Bad Boys Rob Our Young Girls...." -- go figure. Well I did build a boatload of Heathkits in my younger days! Just retired my Heathkit stereo tuner about a year ago.
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  #9  
Old 03-01-2011, 08:22 AM
Huncowboy Huncowboy is offline
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Quote:
Originally Posted by markl53 View Post
Other electrical items in the car may be on the same circuit as the outlet. What is the rated wattage or amperage of the air pump, that is the important question. The electrical formula is P=E*I, where P=wattage, E=voltage (12V) and I=amperage. If the pump pulls 5 amps, at 12 volts you are running 60 watts. Knowing two of the variables you can figure the 3rd by re-arranging the factors in the equation. Meaning, I=P/E, etc.
I am on the road. I will look it up once I get home again.

It is a small pump. Viair model 00073. I can't find any online manuals.
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  #10  
Old 03-02-2011, 04:16 PM
Huncowboy Huncowboy is offline
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Does not say how many Watts but is says it is only 14A and 12V. So it makes sense it blows out the 15A fuse. I guess I will have to call my service advisor to find out how many amps the cigarette lighter is.
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  #11  
Old 03-02-2011, 05:36 PM
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Quote:
Originally Posted by Huncowboy View Post
Does not say how many Watts but is says it is only 14A and 12V. So it makes sense it blows out the 15A fuse. I guess I will have to call my service advisor to find out how many amps the cigarette lighter is.
14 amps x 12 volts = 168 watts. But you're right, 14A on a 15A circuit is high. I have a small Sears air compressor that I use, not sure of the amps but it has never blown a fuse. The one you have might be more powerful.
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  #12  
Old 03-02-2011, 07:23 PM
Huncowboy Huncowboy is offline
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Quote:
Originally Posted by markl53 View Post
14 amps x 12 volts = 168 watts. But you're right, 14A on a 15A circuit is high. I have a small Sears air compressor that I use, not sure of the amps but it has never blown a fuse. The one you have might be more powerful.
isn't it annoying that the manual does not state stuff like this? I mean the BMW manual. Overall it is very sparse. I remember the topic about the Sport mode and other things too. Lot of guessing on our part. Not much info in this thing anymore.
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  #13  
Old 03-03-2011, 03:24 PM
Zathris Zathris is offline
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When I went to pick up my ED car unseen, I asked the service department what sized inverter I could safely put into the car to power my AC adapters. After some research the Service Manager's official response was 12amps max nominal power.
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  #14  
Old 03-03-2011, 03:34 PM
Huncowboy Huncowboy is offline
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Originally Posted by Zathris View Post
When I went to pick up my ED car unseen, I asked the service department what sized inverter I could safely put into the car to power my AC adapters. After some research the Service Manager's official response was 12amps max nominal power.
Thanks for the info.
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