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Tool Talk Discussion Forum

question about a welder/generator

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Jerry Wallen

12-08-2006 06:32:53

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I have a old NCG sureweld DC welder AC generator power3d by a 2 cyl Onan. It says it is 3500 watts of 60cy AC power. It welds fine but when I tried to use it to run a refrigerator during our recent ice storm it would not start it. The motor would lug down and with an AC voltmeter it shows 120 volts when it is trying to start the refrigerator. Any ideas of what I should check? Thanks

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zira

12-09-2006 05:59:05

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Re: question about a welder/generator in reply to Jerry Wallen, 12-08-2006 06:32:53

I have run our 11-year old fridge way too many times on either a 3000 watt Penncraft or a 3500 watt Winco (from 1957), without any problem. The Winco is putting out 2 legs of 120 fused at 10 amps each. I start just the fridge first, then turn on whatever else I want to run (lights, fans, TV & VCR), and the fridge cycles okay with the other stuff running without a problem.

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JayWalt

12-08-2006 16:07:15

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Re: question about a welder/generator in reply to Jerry Wallen, 12-08-2006 06:32:53

One thing to make sure with any type of refrigeration equipment is this.
When you first start the unit up, there is a surge current required to get the compressor going. Now heres the thing, when the compressor builds up the pressure to nearly 300psi and the power is removed, it must stay removed until the refrigerant can bleed through the orfice and the pressure on the high and low side can equalize. A compressor does not have the HP to start up when the pressure is too high. General time frame for bleedoff is 3 minutes, no less. If you try to start it to soon the motor will just hum and the current draw will go through the roof. I dont know if this is your problem, and I doubt it is, but I thought I'd just warn you guys for future reference. =)

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JC23

12-08-2006 09:53:22

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Re: question about a welder/generator in reply to Jerry Wallen, 12-08-2006 06:32:53

I've got a Miller BlueStar 3500 watt and will run the fridge I have about 15 yrs old. Must have the throttle wide open and amp control turned to max position to operate AC powered appliances (generator). It should be enough to run your fridge fine too.

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Jerry Wallen

12-08-2006 10:41:49

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Re: question about a welder/generator in reply to JC23, 12-08-2006 09:53:22

I don't think the amp control on my welder has any effect on the the AC function--I know it will weld when the AC function is used but at a very low amperage. My unit has a micro switch up by the throttle and when the unit is moved to idle position it hits that switch and makes the AC portion work. You can vary the voltage by adjusting the governor at idle. I have it run up to about 130 volts no load and 122-123 under load--still would not start the fridge--it is a new fridge by the way--thanks for all of your replies

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MLP

12-08-2006 08:36:26

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Re: question about a welder/generator in reply to Jerry Wallen, 12-08-2006 06:32:53

My old refrigerator took 31 amps to start but only four to run. It may work if you start the refrigerator by it�s self first. Give the refrigerator compressor about five minutes in between attempts to start it.

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Butch(OH)

12-08-2006 08:30:39

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Re: question about a welder/generator in reply to Jerry Wallen, 12-08-2006 06:32:53

I can add only a little to what John T said. My 3500 Toy-built genny will easily start my 5 year old fridge but like most other electric things and older fridge probably takes more running and starting amps? One more thing I can think of is if the welder has an auto idler it will not start near as big a A-C load as if it runs at governed RPM no load, this from past experiance. Shut off the auto idle if so equipped.

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John T

12-08-2006 08:00:22

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Re: question about a welder/generator in reply to Jerry Wallen, 12-08-2006 06:32:53

Jerry, sorry I cant tell ya what to check. The older brush type generastors would get short n put out voltage but fail under a high current demand while the newer brushless types can have SCR and controller type problems I believe.

However I can tell ya, as you probably already know, a motor takes like 6 times the current to start it as it does to keep it running and ifffff fff the genny isnt high enough rated it simply can NOT start a bigger motor. Off hand Id think a 3500 watt should start a household fridge, but I got no way of tellin from here cuz the genny and its wattage n VA n the motors starting current are alllll l unknown, probably couldnt even tell ya if I had all that lol

All Im sayin is, maybe the genny is fine its simply not sufficient rated to start the fridge????? ????? ???

If you have a Graingers catalog handy it has good data along the lines of genny rating n starting motors etc.

Sorry no help

John T

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