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Old 06-08-2012, 09:45 AM   #1
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Changing Air Compressor from 120v to 12v

Unfortunately I know next to nothing about anything electrical. I have a 120v EasyAir 2Go air compressor from Sears that I use to top off the tires on my MH. It does a wonderful job going up to 135 psi with no problem.

Now that I have a Jeep as well, I need to deflate my tires prior to climbing the high mountain passes I enjoy and then reinflate once back at "ground" level.

Is there any way that my air compressor can be converted so that it is capable of doing both 120 and 12v? If not, can you recommend a good 12v that I can carry in my Jeep for just such occurences?
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Old 06-08-2012, 10:52 AM   #2
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You could put a 12 volt DC to 120 volt AC inverter in the jeep, but it would have to put out enough watts to over-come the start-up demand of the compressor.



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Old 06-08-2012, 11:28 AM   #3
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It will take a pretty big inverter probably to run the 120V compressor. In the long run you will probably end up spending close to the same as just buying a compressor.

I don't have much experience on small portable 12V compressors, mostly have ever dealt with on board air systems. You may want to consider adding a compressor and tank to the jeep so you have air at all times without lugging around the 120V compressor.

If you wanted to go that route I would suggest looking at Viair's products. I have always used their compressors with great success.

One thing I did that might help your situation. I had a wheelbarrow style 120V compressor, I built a mount for a Viair 450C compressor and plumbed it into the tanks. I then wired a quick connect onto the Viair and another quick connect onto my truck. This requires running some large 4 gauge wiring but worked best for my situation at the time. When I needed to use the compressor around the house, I plugged it in like normal. When I needed air while at a car show I plugged the Viair compressor into the quick connect.
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Old 06-08-2012, 01:14 PM   #4
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Quote:
Originally Posted by golden View Post
Unfortunately I know next to nothing about anything electrical. I have a 120v EasyAir 2Go air compressor from Sears that I use to top off the tires on my MH. It does a wonderful job going up to 135 psi with no problem.

Now that I have a Jeep as well, I need to deflate my tires prior to climbing the high mountain passes I enjoy and then reinflate once back at "ground" level.

Is there any way that my air compressor can be converted so that it is capable of doing both 120 and 12v? If not, can you recommend a good 12v that I can carry in my Jeep for just such occurences?
It will be MUCH easier and cheaper to get a dedicated 12VDC compressor for your jeep (or anytime you're on the road) because of the BIG difference in A/C vs. D/C motors. The inverter idea is OK, but that would probably be part of your RV and not available to the Jeep while on excursion.

There are SO many ways you can put air on your Jeep (from a simple system from JCWhitney -> to an all-in-one Winch/AirSupply from Warn.

A good portable unit might be a good option that can be shared with the RV and Jeep. Do a "Google" search for "portable 12V air compressor" and you will see everything from Walmart's Masterflow to Heavy duty "AirLift" units from Camping World ($311).

Be sure to check the Max and Working PSI to make sure the one you like will do your RV tires.
The main difference between built-in vs. portable compressors is the holding tank. You don't need a tank if you are just inflating tires.
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Old 06-08-2012, 01:25 PM   #5
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Harbor Freight has a great 12V air compressor that attaches directly to the battery. Screws onto the valve stem. Inflates one of my 35s from 10PSI to 25PSI in 4 minutes. It is on sale now for $59.95
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Old 06-08-2012, 01:29 PM   #6
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I meant a dedicated inverter in the Jeep, or at least one in the Jeep when off-road.



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Old 06-11-2012, 12:06 PM   #7
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There are threes basic ways of refilling tires after offroading:

1. Use a 12volt compressor off the battery, with engine running.

2. Use a compressor hooked to your engine, much like the AC.

3. Use a CO2 tank.

All of these can be seen and priced at places like Quadratec - Air Compressors, Kilby AirBoss, and 4 Wheel Parts - Portable Air.

Enjoy.

BTW I have the engine powered compressor and can run power tools. But it is not cheap.
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