- Joined
- Jul 6, 2002
- Location
- Coventry Rhode Island
Amps to HP can anyone tell me where I can find an amp to hp chart. I am looking at 3.9 amps at 120 volt. Thanks.
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Amps to HP
- Thread starter lclark2074
- Start date
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- Jan 17, 2003
- Location
- Tomball, Tx.
Is this to find the HP of a compressor?? or what?
OP
- Joined
- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #3
I found the formula it is 1 hp = 745.699872 Watts
I am sorry about my spelling.
3.9A x 115V = 448.5 watts / 745 = 0.60 HP
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But when I bought it and took it apart I saw 1HP on label?
I am sorry about my spelling.
3.9A x 115V = 448.5 watts / 745 = 0.60 HP
-----------------------------------------
But when I bought it and took it apart I saw 1HP on label?
OP
- Joined
- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #5
I agree 745 / 115 = 6.47 amps
The listing a the dehumidifier seas 3.9 amps
The rating on compressor seas 1HP 60hz 115 LRA 17
Model number is QA050CBA
SER NO is 21E00263-A-3ML21-801311
I have not looked at any tec sheets yet
The listing a the dehumidifier seas 3.9 amps
The rating on compressor seas 1HP 60hz 115 LRA 17
Model number is QA050CBA
SER NO is 21E00263-A-3ML21-801311
I have not looked at any tec sheets yet
- Joined
- Apr 1, 2004
- Location
- Vancouver Canada
This is a real shot in the dark, but is it possable that the compresor is on a voltage regulator and not getting the full 115?
also, is it possable that the power rating (3.9 amps) is for the average operation of the unit, where the compressor may only be on half of the time?
also, is it possable that the power rating (3.9 amps) is for the average operation of the unit, where the compressor may only be on half of the time?
greenman100
Disabled
- Joined
- May 18, 2003
Mustanley said:Look at the rating on my chiller sporting a Danfoss compressor.
According to that formula this is nearly 3/4 HP, but yet the label lists 1/4 HP
Go figure
Yes, because the voltage and current are out of phase. Go Google if you care to learn more. Those specifications are correct.
Last edited:
- Joined
- Apr 1, 2004
- Location
- Vancouver Canada
If you know the phase angle you can calculate everything you want. The problem is finding the angle. If you can't find any other information on the electricl properties of the device, then just measuring the power with some sort of meter is probably the easiest way.
OP
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- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #11
The formula was taken from google.com I put in (watts to hp converters) and it gave me a websight that gave me that formula?
And my amps listed on case on dehumidifier and HP is listed on compressor
Yours is more realistic remember there a fan and control circuitTo remember.
And my amps listed on case on dehumidifier and HP is listed on compressor
Yours is more realistic remember there a fan and control circuitTo remember.
OP
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- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #12
Mustanley said:Look at the rating on my chiller sporting a Danfoss compressor.
According to that formula this is nearly 3/4 HP, but yet the label lists 1/4 HP
Go figure
I agree but yours maybe talking about starting amps not running amps ?
OP
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- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #13
No I did not see a voltage regulator just cap start unit
- Joined
- May 8, 2002
Wherever I see horsepower rating directed at the consumer, I ignore it. It's unregulated and often grossly overstated. It can mean "developed horsepower" for example, an engineer's trick, which might be a heavy flywheel spun by the motor in question, then the force needed to brake the flywheel is the horsepower rating boasted on the box.
Stick with amps, and remember larger motors are more efficient due to better windings and clearances.
Stick with amps, and remember larger motors are more efficient due to better windings and clearances.
- Joined
- Jan 19, 2003
craig588 said:thats fraud right there.
semi OT: I just remember that 1HP=~6.5 amps on a 115V line, thats an incredibly accurate number of watts you found though.
Precise? Yes. Accurate? Who knows?
OP
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- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #16
I got amp probe so when I get home in couple of days I will check the true amps out. Maybe this will get to bottom of this
OP
- Joined
- Jul 6, 2002
- Location
- Coventry Rhode Island
- Thread Starter
- #17
I checked it with amp probe and draws 3.8 amps
- Joined
- Feb 22, 2004
- Location
- Brookfield, Ohio
lclark2074 said:
isn't this the physics formula. in physics doesnt watts mean something else. and 745.699872 watts = 1hp is in i believed used in U.S american system. i might be wrong. their are few kinds of systems for HP. such as Boiler HP, continental HP, Electical HP, Water HP, Metric HP, as well as U.S HP.
OP
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- Jul 6, 2002
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- Coventry Rhode Island
- Thread Starter
- #19
Probably your right butBioTuned said:
I would think thy should be still close not about 1/3 off.
- Joined
- Apr 1, 2004
- Location
- Vancouver Canada
It's also possable the the power rating on the comressor is talking about it's cooling power, and not it's power consumption. It's quite common for a phase change system to have a COP above 1. The compressor may be rated at 1 hp, and have that much cooling capacity, but only draw 1/2 hp of electrical power.
