3 phase compressor
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Fleet Owner
Joined: May 2009
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From: Gilbert, PA
3 phase compressor
I just purchased a Quincy Compressor. It is a beaut! 10HP 120 Gal tank and it has a 4cyl compressor. One small problem, It is 3 phase. It came w a 10hp single phase motor as well but I am concerned how much the single phase will make the electric meter spin! I have heard about 3 phase converters but I dont know anything about them. Any help would be appreciated
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O and i got this compressor for a song, so i really dont mind spending a lil money on a converter if that is the way to go
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O and i got this compressor for a song, so i really dont mind spending a lil money on a converter if that is the way to go
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1 HP equals 746 watts of power.This is usually rounded up to 1000W to cover the power factor of the motor.10 HP = 10,000 Watts Assuming the motor is 240V,10,000/240v=41.66 Amps 3 phase motors are more efficient and run smoother.It uses roughly 1/2 the Amps of a single phase motor of the same size.I have installed a small rotary phase converter for a small lathe and it seemed to work allright.They are sized for the load and one for a 10HP air compressor may have to be up sized due to starting under load.You may want to install a motor starter for protection for your motors.Hope this helps.
Hotshot
Joined: Oct 2002
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From: The Big, Oregon
If you have the option, you really should get three phase power installed. A rotary phase converter isn't cheap, and will need to be sized for the compressor plus some buffer. So, you'll also wind up with a 10-15hp motor running idle to generate the third phase, drawing more power. If you buy a phase converter, it'll run you about $2k. To build one, if you get a reasonably priced motor used, it'll be in the $500-$800 range.
Another option might be a 20kw 3phase generator, if you won't be using the compressor continuously.
Another option might be a 20kw 3phase generator, if you won't be using the compressor continuously.
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Fleet Owner
Joined: May 2009
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From: Gilbert, PA
If you have the option, you really should get three phase power installed. A rotary phase converter isn't cheap, and will need to be sized for the compressor plus some buffer. So, you'll also wind up with a 10-15hp motor running idle to generate the third phase, drawing more power. If you buy a phase converter, it'll run you about $2k. To build one, if you get a reasonably priced motor used, it'll be in the $500-$800 range.
Another option might be a 20kw 3phase generator, if you won't be using the compressor continuously.
Another option might be a 20kw 3phase generator, if you won't be using the compressor continuously.
As for getting 3 phase to my house
I live aprox a mile from any 3 phase distribution lines. I would guess it would cost me at least 30k to have 3 phase brought to my house
Hotshot
Joined: Oct 2002
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From: The Big, Oregon
All I can find in that price range is a 2-3hp version. Also, a phase inverter does not provide balanced voltage, and can have problems with starting. You get about 80% of the motors rated power, and usually have to manually move the motor some to get it to spin. A rotary phase converter is much better, but also uses more power in it's operation.
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The 10 hp single phase motor would cost about $1 per hour to run.I'm paying a little under 10 cents per kilowatt hour.10KW x .10=$1 It doesn't run continually so it might not cost as much as you think.Might dim the lights a little when it kicks on.
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Fleet Owner
Joined: May 2009
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From: Gilbert, PA
HOLY COW. i just got a phone call returned stating the "add-a-phase" would be $3245. No 3 phase power for me! Guess i'm gonna run the single phase
. No 3 phase power for me! Guess i'm gonna run the single phase
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Lead Driver
Joined: Jul 2007
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From: Rhode Island
Check the voltage the motors are rated for. I'm betting that 25.2-26 Amps on the 3 phase motor is rated at 440/460/480 volts. 25 amps @ 230 volts is only 5750 watts, or about 7.7 "electrical" HP, less actual mechanical HP do to inefficiency.
You get billed by how much power you use. Power is watts. Watts is Volts x Amps. If you double the voltage, you can half the amperage but the total power used remains the same. Chances are that 3 phase motor is either not 10HP, or is rated for 440/460/480 while the single phase motor is rated for 220-230
3 Phase motors do NOT use 1/2 the power of a single phase motor for a given power output. They are marginally more efficient, but not anywhere near that extreme.
You get billed by how much power you use. Power is watts. Watts is Volts x Amps. If you double the voltage, you can half the amperage but the total power used remains the same. Chances are that 3 phase motor is either not 10HP, or is rated for 440/460/480 while the single phase motor is rated for 220-230
3 Phase motors do NOT use 1/2 the power of a single phase motor for a given power output. They are marginally more efficient, but not anywhere near that extreme.
Lead Driver
Joined: Jul 2007
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From: Rhode Island
Those numbers are meaningless, read the voltages for what those amps are rated at.
Hotshot
Joined: Jan 2008
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From: Rochdale MA
You have to remember that the 25 A is per phase or leg also. As said before as the voltage increases the amperage decreases but it is per phase.
