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Tool Talk Discussion Forum

Generator

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chvet73

07-29-2007 16:02:48

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Well I got my first generator. A Kawasaki 6400. Puts out 110 and 220. After a new carb it runs great.
My question is am I expecting to much from this machine or is something wrong with it? It will run a small hand drill or even my old radial arm saw but it when it comes to something like a 20 gal. 110v compressor or 110v mig welder it can"t do the job.
So what am I missing here or should I have bought a bigger generator?

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buickanddeere

07-29-2007 21:59:58

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Re: Generator in reply to chvet73, 07-29-2007 16:02:48

The 1-1/2HP 120V motor on the compressor will be drawing 15+ full load amps even if at unity power factor. Inrush current to start that reciprocating compressor over with a single phase capacitor start motor will be at the very least 75amps for the 1st few cycles and 50+amps for 1-4 more seconds until the motor comes up to centrifugal starter switch throw-out rpms of approx 3000. There is no way the 3200W side of the generator can supply 75+ amps and keep the line voltage at at least 110V at the same time. That's 8000+ watts. The engine can't even make that much power even if coupled to a larger generator. There just isn't enough volts X amps from that generator to supply enough energy to roll that motor/compressor over. If the lights dim with a compressor starting when connected to several 750,000,000W Hydro utility generators. Your 6400W generator has some awful big shoes to fill.

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KEB

07-29-2007 20:53:20

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Re: Generator in reply to chvet73, 07-29-2007 16:02:48

Sounds like there's something wrong. I have a 5500 watt (continuous) generator that barely notices my 110 volt MIG welder, and actually does quite well with a 220 volt stick welder. The stick welder will pop the circuit breaker if I turn it up too high, but otherwise the generator carries it fine.

6400 watts at 240 volts is about 26+ amps. You should be able to easily draw 20 amps out of each of the two 120 volt outlets. Anything you can run on a 20 amp 120 volt circuit should run just fine on that generator, assuming that 6400 watts is continuous and not the surge rating.

Is Kawasaki the engine or generator manufacturer? Did a quick internet search & didn't come up with anything for generators marketed under the Kawasaki name?

What does it do when you put a load on it? You mentioned replacing the carburetor. Adjusting the carburetor & governor so the generator holds a constant speed under varying load is sometimes difficult. If its dropping speed when you put a load on it, the output voltage would go down as well and nothing would run right. If that's the case, you need to find someone who know's how to adjust the governor & carburetor to respond properly.

Keith

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chvet73

07-29-2007 21:07:03

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Re: Generator in reply to KEB, 07-29-2007 20:53:20

Kawasaki makes both the motor and the generator. On larger tools it does nothing. On small tools the governor speeds the motor up underload. Governor is vacum operated from a hose right behind th carb mounting plate.
You can go find the parts diagrams on the Kawasaki site. The first carb had a crack and leaked. I also reset the maneto air gap. Set idle and idle mix. no high speed screw.

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Greg_Ky

07-29-2007 16:42:12

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Re: Generator in reply to chvet73, 07-29-2007 16:02:48

6400 is that the surge watts or the rated watts? Either way find the running amps on your air compressor and you will need at least three times the running amps to start it. your Genny is a little small for either one.

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