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220 VOLT COMPRESSOR

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johnd(at)wlcwyo.com
Guest

Posted: Fri Feb 22, 2008 3:50 pm Post subject: 220 VOLT COMPRESSOR

Bob,  

I had a 120 volt air compressor and change to a 220 volt model thinking I would save some on my electrical bill.  

I was under the impression that the amp’s being drawn would be cut in half when going to 220V.  

A friend says the 220 v motor will still draw the same amps. That each leg of the 220 v will draw half the amp’s but the combined draw is still the full draw of the 110 v.  

I told him that hat is correct but that one leg of the 220 v line will be out of phase with the other, so only half the amps are being required.  

Is this correct?  

   

Thanks    

John L. Danielson  

  

   

        [quote][b]

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bob(at)bob-white.com
Guest

Posted: Fri Feb 22, 2008 4:19 pm Post subject: 220 VOLT COMPRESSOR

On Fri, 22 Feb 2008 16:47:24 -0700

"John Danielson" <johnd(at)wlcwyo.com> wrote:



 	  Quote: 	
		   Bob,

 

 I had a 120 volt air compressor and change to a 220 volt model thinking I

 would save some on my electrical bill.

 

 I was under the impression that the amp's being drawn would be cut in half

 when going to 220V.

 

 A friend says the 220 v motor will still draw the same amps. That each leg

 of the 220 v will draw half the amp's but the combined draw is still the

 full draw of the 110 v.

 

 I told him that hat is correct but that one leg of the 220 v line will be

 out of phase with the other, so only half the amps are being required.

 

 Is this correct?

 

  

 

 Thanks

 

 John L. Danielson

 

In a word, no, it is not correct.  You are going to need a certain
	


amount of power depending on the HP rating of your electric motor.

Maybe the 220V motor is a little more efficient, but I don't think

much.  You do get some benefit from lower losses in the 220V circuit

because of the lower current.  If you need a really big compressor (big

motor) you might need to go to 220V because you can't deliver enough

current at 120V.  For the record, both 120 and 220 circuits are single

phase.  The current in the common between the two phases is zero, but

all the current you are using is flowing in the hot wires.



All said, there are advantages to going to 220V, but you won't be

saving 1/2 the power when running the same size compressor.



Bob W.



-- 

N93BD - Rotary Powered BD-4 - http://www.bob-white.com

3.8 Hours Total Time and holding

Cables for your rotary installation - http://roblinstores.com/cables/

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JOE RONCO

Joined: 04 Aug 2007
Posts: 31
Location: CENTENNIAL COLORADO

Posted: Fri Feb 22, 2008 5:50 pm Post subject: 220 VOLT COMPRESSOR

JOHN: >From my limited electrical knowledge, HP = Watts (746 watts = 1 HP). Watts = Volts x Amps. Your power bill is paid on the number of Watts used. For a given HP motor the Watts is the fixed, so at 220 Volts you will have the same Watts but half the Amps that you would have with 110 Volt power supply. Therefore your power bill will not change.  

   

Hope this makes sense.  

   

Joe Ronco.  

       

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of John Danielson

 Sent: Friday, February 22, 2008 4:47 PM

 To: aeroelectric-list(at)matronics.com

 Subject: 220 VOLT COMPRESSOR  

  

  

   

Bob,  

I had a 120 volt air compressor and change to a 220 volt model thinking I would save some on my electrical bill.  

I was under the impression that the amp’s being drawn would be cut in half when going to 220V.  

A friend says the 220 v motor will still draw the same amps. That each leg of the 220 v will draw half the amp’s but the combined draw is still the full draw of the 110 v.  

I told him that hat is correct but that one leg of the 220 v line will be out of phase with the other, so only half the amps are being required.  

Is this correct?  

   

Thanks    

John L. Danielson  

  

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        [quote][b]

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rv-9a-online(at)telus.net
Guest

Posted: Fri Feb 22, 2008 10:14 pm Post subject: 220 VOLT COMPRESSOR

 	  Quote: 	
		   Bob,

 

 I had a 120 volt air compressor and change to a 220 volt model 

 thinking I would save some on my electrical bill.

 

 I was under the impression that the amp's being drawn would be cut in 

 half when going to 220V.

 

 A friend says the 220 v motor will still draw the same amps. That each 

 leg of the 220 v will draw half the amp's but the combined draw is 

 still the full draw of the 110 v.

 

 I told him that hat is correct but that one leg of the 220 v line will 

 be out of phase with the other, so only half the amps are being 

 required.

 

 Is this correct?

 


	




Theoretically, if you are consuming the same volume of air at a given

pressure, a 110 and 220 compressor will consume the same energy and the

average powers will be the same. (other than slight differences between

compressor types and design).



Vern

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rv9jim(at)juno.com
Guest

Posted: Sat Feb 23, 2008 6:52 am Post subject: 220 VOLT COMPRESSOR

John,

        Your are paying for power.  1 kw is still 1 kw whether you do it

with lower voltage and higher current or higher voltage and lower

current.  It all comes out the same.  The real advantage with the 220v

system is you can use smaller wire in setting up the system.  The losses

in the system are smaller with the higher voltage.  Not enough to matter

in this case.  I run my compressor off my dryer circuit which is a 30a

circuit.  Since I went with gas for drying, that circuit was available

with just a plug and a bit of wire to a manual disconnect at the

compressor.. (you need that). 

Jim

off to the painter

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gmcjetpilot

Joined: 04 Nov 2006
Posts: 170

Posted: Sat Feb 23, 2008 7:37 am Post subject: 220 VOLT COMPRESSOR

John:

   

  You did the right thing but.... not to save money.

Unless you are running a factory with hundreds of 

AC motors money saving on the electrical bill is 

not the issue.

   

  Some synchronous AC motors have a leading power 

factor (look it up) and thus exploit how the utility 

companies charge you. However a compressor 

duty is pretty small and again we are talking about 

once relatively small compressor.

   

  

Get a 220 Compressor, not to save electricity but to 

have more power to make more air. The 220 volt motor 

is more efficient for the job and you may save some 

electricity, if comparing HP to HP, but the issue is 

getting enough HP with 110 volts to drive a compressor 

that is large enough to make enough volume of air fast 

enough for the application. Air tools and Pro painting is 

very air intensive applications. The surge current  to start 

a large compressor is huge and you need a 220 v motor 

to get a bigger compressor going at all. If all you do is 

fill some tires or beach balls, than 110 v is OK.

   

  

The small effort to wire in a 220 plug is small. 

HOWEVER BE Careful, electricity can kill you. If in 

doubt get a Pro and spend the money, or get help.

 

Yes house current is 220 Volt AC, 60 Hrz, with two hots 

and one neutral. 

   

  -Any / either hot to neutral is 110 Volt. 

   

  -Hot to Hot is 220 volts. 

   

  -If you do any wiring than TURN off all electricity and BE 

-very very careful. 

   

  -The ground is ground for 110 or 220 volt.

   

  Just be careful. If anyone is going to rivet a RV together 

or paint anything, get 220 V. Get a REAL compressor 

not a Sears 110 v oil less toy compressor.

    

  If you want to learn about AC motors single phase or 

multi phase check the Google. 

   

  http://en.wikipedia.org/wiki/AC_motor

   

  There is a thing called the "power factor" and it is how 

the utility company chargers you. AC electrical power 

engineering has terms like "real pwr", "apparent pwr" 

and "reactive power". Google this for an explanation. 

Again one little compressor for a hobby? No big deal. 

  

George

   

  PS if you do the wiring write me I can help you.

 

 

 	  Quote: 	
		  From: "John Danielson" <johnd(at)wlcwyo.com (johnd(at)wlcwyo.com)> 

Subject: 220 VOLT COMPRESSOR 

 
	


Bob, 

 

I had a 120 volt air compressor and change to a 220 

volt model thinking I would save some on my 

electrical bill.I was under the  impression that the 

amp's being drawn would be cut in half when 

going to 220V. 

 

A friend says the 220 v motor will still draw the 

same amps. That each leg of the 220 v will draw 

half the amp's but the combined draw is still 

the full draw of the 110 v. 

 

I told him that hat is correct but that one leg of the 

220 v line will be out of phase with the other, so 

only half the amps are being required. Is this 

correct? 

   

  Thanks John L. Danielson

        Be a better friend, newshound, and   [quote][b]

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