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Old 10-28-2015, 02:01 PM   #1
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12-volt extension cord question

My portable air compressor has quit holding a charge, but it works great when I plug it into a 12-volt socket. However, I need an extension cord for it to reach my trailer tires. I read somewhere that the compressor is about 25 amps and that the available extension cords have a 5 amp fuse in them and won't work for that reason. Could I get one of these extension cords and change its fuse to something larger, or is that a dumb idea?

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Old 10-28-2015, 02:16 PM   #2
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Dumb idea. You will get a large voltage drop from the wires and probably burn out your compressor. Running under voltage will cause it to draw more current and run hotter.

I'm not sure of a good solution. I would take it apart and put in a new battery or look into getting some LiPo batteries and make a set that gives you ~13 volts at 25 amps.

If your compressor can run over voltage (15v) a 10000 mah 4s LiPo rated for 30c should run it fine. You can also make a plug with some diodes to put it at about 13 volts.

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Old 10-28-2015, 02:17 PM   #3
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Why not use a regular 110 extension cord and modify it with the proper plugins for our use? put a regular 110 plug on the end of your compressor and an adapter for the other end of the extension crd.
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Old 10-28-2015, 02:21 PM   #4
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Can you make the air hose longer instead of the power cable?
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Old 10-28-2015, 02:23 PM   #5
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i run my portable compressor off the traielr battery - its 17 feet shorter than the truck battery.
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Old 10-28-2015, 02:44 PM   #6
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I use a standard cheap extension on my 12 volt compressor. Mine is 40 years old. There is no way it draws 25 amps, maybe 10 amps. Yours was running on battery and most likely a 7.5 amp/hr battery, 25 amp draw would kill the battery in short order

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Old 10-28-2015, 04:54 PM   #7
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A new 50ft air hose is the best way to go or put two together and have a 100ft

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Old 10-28-2015, 05:54 PM   #8
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12-volt extension cord question

Get a jump box and cover yourself on two matters. Not a jump box w/ compressor- just jump box with 12v outlet. Think I paid 65 for 900amp from Sears.

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Old 10-28-2015, 06:05 PM   #9
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X3 on longer hose. You lose very little performance with longer hose. If it must be portable, you can easily replace the battery. Just open it up and enter the battery number in amazon to find a replacement.

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Old 10-28-2015, 06:06 PM   #10
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Originally Posted by strat56 View Post
Can you make the air hose longer instead of the power cable?
This ^ Simple and cheap.

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