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Tool Talk Discussion Forum

OT.electrical generator.

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cb

05-12-2008 11:49:23




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when buying a generator.what is the fromula for converting the watts of the generator to the amps that is is capablle of producing. thanks. i have seen the conversion somewhere, but i have forgotten




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buickanddeere

05-12-2008 19:15:50




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 11:49:23  
Good size. Real engine or a Chinese knockoff?



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timcasbolt

05-12-2008 18:58:15




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 11:49:23  
A 6500 Watt generator is a nice size for those temporary blackouts. It will handle most of your needs until the power comes back on. To answer your original question: It'll give you about 54 amps at peak, and around 42 amps continuous.



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cb

05-13-2008 05:59:12




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 Re: OT.electrical generator. in reply to timcasbolt, 05-12-2008 18:58:15  
thanks again for your help. it is a champion brand generator. i asked a local dealer that it was purchased from [ no longer is a dealer for it ]. they say the gas motor is a generic honda motor 11 hp. the website says it is an american co. manufactured in china. i have emailed the co. for info about their dealers. have a good day



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cb

05-14-2008 06:21:47




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 Re: OT.electrical generator. in reply to cb, 05-13-2008 05:59:12  
thanks for the advice. i had a generator a few yrs. ago. really never thought to check it with meter, etc. just pluged in a skil saw and other shop equip. have a good day



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buickanddeere

05-14-2008 05:47:40




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 Re: OT.electrical generator. in reply to cb, 05-13-2008 05:59:12  
Before running anything. Put a meter on the gen and check the voltage and frequency. It"s good policy to test before using any generator made by anybody.



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JT

05-13-2008 15:04:45




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 Re: OT.electrical generator. in reply to cb, 05-13-2008 05:59:12  
Yea, that is what they all tell people. I work on a lot of the cheap chinese generators, I would not have a Chinese generator for anything other than running a saw, a light bulb, a drill, something that will not get ruined with dirty erratic electricity.
Jim



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cb

05-13-2008 16:26:07




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 Re: OT.electrical generator. in reply to JT, 05-13-2008 15:04:45  
thanks again for the info. it seems just about everything is being made somewhere besides here. most of the brand name items, that have been around forever, are now being made outside us. anyway have a good evening



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gun guru

05-12-2008 15:13:25




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 11:49:23  
When you buy a generator look for KVA or Kilo-volt-amps. If you have a 10hp generator it is usually rated for 5KVA or 5000watts. It is also listed as having a maximum of 6500watts. Volts X amps = watts.



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buickanddeere

05-12-2008 14:29:32




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 11:49:23  
Better to avoid the watts on any electrical equipment with a motor, coils etc. Use volts X amps for voltamps.
If you are sizing for the minimum generator size, don't. If there are motors to start, in particular compressors. Inrush current is 5-6 times over rated running current.



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Goose

05-12-2008 13:51:00




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 11:49:23  
The magic formula is P=IE, where P=Power in Watts, I=Current in Amps, and E=Electicity in Volts.

So, Power in watts equals amps times volts.

Then, by placing the P above the IE two other formulae can be derived. Current in amps equals power in watts divided by volts, and volts equal power in watts divided by current in amps.

Just remember PIE, and the formulae will come back to you.



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Greg_Ky

05-12-2008 12:11:36




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 11:49:23  
Watts divided by volts equals amps.



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cb

05-12-2008 16:46:35




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 Re: OT.electrical generator. in reply to Greg_Ky, 05-12-2008 12:11:36  
well thanks a whole heap.i am considering looking at a generator. 11hp gas motor with 6500.. watts.. supposely used 2 weeks .. has 2 110 and 1 220 plugs. will use for freezer, refri gerator etc for short periods of time. have a good evening



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JT

05-12-2008 20:31:52




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 Re: OT.electrical generator. in reply to cb, 05-12-2008 16:46:35  
If it does not have at least a 30amp plug in, is not a decent generator, don't waste your money. A lot of the cheap generators produce dirty electricity and will burn up a lot of electronic circuitry real fast. What brand are you looking at?

Jim



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