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Tool Talk Discussion Forum

some elec advice please.

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cole in mo.

11-23-2007 17:14:29




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I have a 3500 surge, 3000 run portable generator, and have a chance to get a neat little portable air compressor. Its a 1.6 induction motor, runs on a 15 amp circute, and has start and run capsatators, it puts out 150 lbs max. Question is will my generator handle this compressor,




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guido

11-24-2007 09:28:30




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
Hey cole

One h.p. equals 746 watts, that means 1.6 h.p. motor will need about 1200 watts.
1200/120 =12amps.15 amp circuit should run it.
Make sure you use proper size wire and no extensions to the compressor.
On start-up it takes 3 to six time more power but it's only for a second or two. if start capacitor is o.k you should not have any trouble.
Guido.



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buickanddeere

11-25-2007 19:45:33




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 Re: some elec advice please. in reply to guido, 11-24-2007 09:28:30  
Consider efficiency there. That 746W/1HP motor will use at least 1000W and 1200Var.



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cole in mo.

11-24-2007 18:20:10




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 Re: some elec advice please. in reply to guido, 11-24-2007 09:28:30  
Thanks guys for all the information, I can get the compressor cheap enough that it will be worth trying anyway.



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Stumpalump

11-24-2007 04:15:36




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
I ran a small electric air compessor off of a 1000W inverter. I metered the amps at start up and bought a larger inverter than the numbers dictated. It still started but slow. The problem is when the tank pressure got below it's turn on threshhold say 80psi and the moter tried to start the inverter could not handle it.The moter needed a lot more current to start under load. I ran the math for this and it still needs too much of a spike to start. It worked out for me because I ditched the tank and let it free flow when I needed air but I never needed more air than to blow up tires. Don't know if this will help but thats what I ran into.

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Harold Hubbard

11-24-2007 06:12:08




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 Re: some elec advice please. in reply to Stumpalump, 11-24-2007 04:15:36  
I use a 1.5hp compressor with a Generac 5000w generator in the sugarplace while washing tubing. It starts fine when the tank is empty, but will not restart against 80-90lb in the tank after it has been running. I teed an old stallcock into the unloader line from the compressor head, and unload it manually, it's a pain, but easier than emptying the tank each time it tries to start. It also requires someone to babysit the compressor, but that kind of job is why you have kids.

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John T

11-23-2007 19:50:39




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
We dont have enough info (motor and unloader data and genny and compressor specs) to say for sure, but I wouldnt bet my life it will start the compressor as it takes something like 6 times the running current to start it????? ??

Id give it a try and hope the compressor has an unloader so the motor dont have to start under a load and hope the motor has its own thermal overload preotection circuit. Just to be safe Id have my hand on the plug or shut off and if the motor hums or buzzes but dont start Id cut the power immediately

John T

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buickanddeere

11-23-2007 19:31:21




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
Does the generator have a 20 or 30amp 120V plug as well as the 15A/120V and 15A/240V? If the generator is equipped with a 20A or 30A plug. The generator might be able to start the compressor if the compressor's tank is at zero psi.



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Gerald J.

11-23-2007 19:02:19




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
A typical induction motor takes 5 or 6 times running current while starting. A 15 amp breaker tied to a power system will supply that without tripping the breaker. A generator rated at 3500 watts will supply only 29 amps while the compressor motor wants 75 to 90 amps. Probably won't start the motor. May stall the generator trying.

Gerald J.



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36 coupe

11-24-2007 04:14:58




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 Re: some elec advice please. in reply to Gerald J., 11-23-2007 19:02:19  
My 5hp planer motor starts with 30 td fuses with no problem.90 amps sounds far out for a 1.6 hp motor.



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Gerald J.

11-24-2007 17:12:59




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 Re: some elec advice please. in reply to 36 coupe, 11-24-2007 04:14:58  
That's why you have the Time Delay fuses. They carry a lot of current for the length of a start.

My Buss fuse data sheet shows type FRN cartridge fuse rated at 30 amps will carry 200 amps for 4 seconds, tapers back to 100 amps for 37 seconds.

And a Tron time delay plug fuse rated at 30 amps will carry 90 amps for 8 seconds.

The locked rotor current (which is the starting current) is 5 to 6 times running current, though there are motors made with up to 8 times running ccurrent for starting. And repulsion-induction motors start with no more current than they take running. But they are no long made.

Gerald J., electrical engineer and farmer

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jdemaris

11-23-2007 18:04:33




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
I've got the same air compressor and I can tell you this. It depends on your generator - they are not all rated the same. So one brand 3000 watt might work and another won't. Some cheat a bit on the way they rate them.

With mine - my Coleman 1850 watt generator will not get the compressor starter. My Homelite 4400 watt generator does with no trouble.



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old

11-23-2007 17:34:45




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
If it pulls less then 15 amps which it would have to since you run it on a 15 amp braker yep that genny will handle it ok. I don't rememebr how to figure that out any more but your genny should say some place what amp is max draw for it



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dlplost

11-23-2007 17:32:55




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
YES, if it will run on a 15a 120v circuit it will run on yer gen. At 120 volts and a 15 amp circuit you are only using 1800 watts. 120v X 15a = 1800w



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Charles (in GA)

11-23-2007 17:22:08




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 Re: some elec advice please. in reply to cole in mo., 11-23-2007 17:14:29  
Need more info. What is the amp draw of the motor as found on the data plate?

Charles



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cole in mo.

11-23-2007 18:12:29




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 Re: some elec advice please. in reply to Charles (in GA), 11-23-2007 17:22:08  
The tag says, 120V, 15A, 60HZ, and 1PH. 1.6 running HP.



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