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OT, Buying electricity??

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Ron/PA

03-23-2003 03:56:44

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Just reading a post below, where it was stated that a compressor was wired for 220v to use less electric. Can anyone explain that to me?
If Electricity is sold and delivered by the watt, How does running on 220 save over 110?
Watts = volts x amps and amps usually halve as voltage doubles, so,,,
220v X 10A = 2200 watts
110v X 20A = 2200 watts
Is there something that I'm missing? Thanx
Ron

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03-24-2003 05:14:36

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Re: OT, Buying electricity?? in reply to Ron/PA, 03-23-2003 03:56:44

I work for an electric motor manufacturer, which builds both 115 and 230 (as well as 480) volt motors. These are primarily for the HVAC industry, but the same applies. The primary reason for less energy consumption relates to the increased number of turns in the higher voltage motors as well as the smaller guage wire to produce the same power output. Higher resistance=less current. By the same theory 480 volt uses less yet. Dual voltage motors as are the case on many compressors are capable of being connected in such a manner so that the windings are either in series or parallel depending on the connection (usually in parallel for 115 operation and series for 230). Use the highest voltage you can and you will save power cost. Actually the most efficient motors we build are 3 phase 480 volt--high horsepower with in many cases very low current. An electrical engineer could explain in more detail, (I am a former engineering tech) but might also be more difficult to understand. Hope this helps.

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IaGuy

03-23-2003 05:18:54

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Re: OT, Buying electricity?? in reply to Ron/PA, 03-23-2003 03:56:44

If there are any losses due to resisance in connections, wiring, etc., the 110volt, 20amp current will produce a "squared" higher loss. Loss= I squared x R(resistance). Examle:
1 ohm x 10 amps (at 220v) = 1000 watts
1 ohm x 20 amps (at 110v) = 4000 watts
More likely your circuite resistance is in the tenths or hundredths of an ohm so the losses are not great, but it just makes sense to operate at the highest voltage and lowest amperage that is practical

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Ron (8n509270)

03-23-2003 04:21:07

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Re: OT, Buying electricity?? in reply to Ron/PA, 03-23-2003 03:56:44

Using 220 is less stress on the motor also.

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John, PA

03-23-2003 04:16:24

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Re: OT, Buying electricity?? in reply to Ron/PA, 03-23-2003 03:56:44

Hi RON,

If you have an electric motor at rest (not runn'n) it takes more time for the motor to come up to speed if it is wired for 110.v

So, the motor is pulling more AMPS for a longer period of time during the starting up. Thus the electric METER is spinning faster for a period of time, than if the motor were usn't 220 v.

Try it some time. Watch your ELECTRIC METER spin while someone starts a 2 hsp. motor with 110 volts. AMPERAGE LOADS equals higher electric bills!

Once the motor is running though, your equasion is correct.

Sometimes, more recently now, we experience momentary power loss. at some of my cold storages.
Well, when all of the equipment comes back on line, you aught to cee the electric meters peg.
SO, we keep records when electrical losses occur.
Sometimes the low voltage "blows" capacitors or even the whole semi'hermetic compressors, when we are loading the rooms with apples.

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Ron/PA

03-23-2003 04:20:11

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Re: Re: OT, Buying electricity?? in reply to John, PA, 03-23-2003 04:16:24

Thanx John, now that was a quick answer to the question. I appreciate you're taking the time for a tudor lesson LOL. Is it safe to assume that with cold storage, and apples that you might be in the Adams county area?
Later
Ron

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Yea..Gettysburg

03-23-2003 04:28:22

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Re: Re: Re: OT, Buying electricity?? in reply to Ron/PA, 03-23-2003 04:20:11

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Bill 52 8n

03-23-2003 08:30:28

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Re: Re: Re: Re: OT, Buying electricity?? in reply to Yea..Gettysburg, 03-23-2003 04:28:22

Apples eh? You guys ever send em east to Ziegler's apple cider in Lansdale PA? I've spent the past few summers workin for an electrical contracter who does all of Ziegler's new and maintinence electrical work.

Bill

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jOHN,pa

03-23-2003 15:59:01

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Re: Re: Re: Re: Re: OT, Buying electricity?? in reply to Bill 52 8n, 03-23-2003 08:30:28

Hi, Bill.

The last that I knew, we were exporting our product in DOLE (tm) containers. on ships. I never check the "bills of lading". Not my job.
I only make cold. Cider mills generally only git the apples that didn't qualify to go into the storage buildings.

Thanks.

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