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# need advice to properly site my generator

#1
11-14-05, 08:39 AM
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Join Date: Nov 2005
Location: USA
Posts: 50
need advice to properly site my generator

I have a large heavy duty 4 cylinder standby autostart generator that I want to install outside in its own little shed. The place I would like to put it is about 100 feet away from the main panel in my home. Assuming I run the proper gauge wire taking the distance into account is that a bad idea? Will I lose a lot of power because of the distance?
Thanks

#2
11-14-05, 08:50 AM
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Join Date: Sep 2000
Location: United States
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Will I lose a lot of power because of the distance?
Not if you "run the proper gauge wire taking the distance into account." But the proper gauge wire taking the distance into account may be pretty expensive.

#3
11-14-05, 09:01 AM
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Join Date: Nov 2005
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What gauge wire would it take to run 62.5 amps at 240v 100-130 feet? The unit is capable of 15k watts. I am not sure of the surge capability but I am told it can start a motor up to 300% of the running watts.

#4
11-14-05, 09:05 AM
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Location: port chester n y
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"Will I lose power because of the distance"----- yes, if the selection of the conductor-size is based on the load-current, measured in amps, only.

The power- loss is proportional to the square of the current, i.e., P = IxI XR, with I=current -value in amps, and R = the conductor resistance.

For a load-current = 20 amps, the P-L in the conductors = 20 X 20 X R = 400 X R watts. For a load current = 50 amps, the P-L = 50 X 50 X R = 2500 X R = 2500XR watts.
With a conductor-resistance = .1 Ohm, the P-L = 2500 X .1 =250 watts. You will note P-L increases "exponentially"

You will have to submit an appox load in watts/ kilowatts that you propose supply from the generator for an accurate calculation to determine the required conductor-size.

Good Luck & Learn & Enjoy from the Experience!!!!!!!11

#5
11-14-05, 09:16 AM
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Join Date: Nov 2005
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Posts: 50
PATTBAA I am down the street in Stamford. I grew up in Greenwich and my wife is from P.C. I am not exactly sure what I expect the generator to supply in watts. It has a 15,000 watt normal running load rating. Do I round up some for this? I intend to power my entire house. I don't want to run a separate panel.

#6
11-14-05, 09:26 AM
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Location: port chester n y
Posts: 2,117

The resistance of 1000 ft of #2 = .156 Ohms ,so you can calculate the P-L for 60 amps with this value. Remember---- a 130 "lineal" distance = 130 X 2 for the "circuit-lenth"
of the conductors.

What is the maximum HP-rating of the largest motor that will operate from the generator?

#7
11-14-05, 09:45 AM
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Join Date: Nov 2005
Location: USA
Posts: 50
I should check my AC compressors but I believe the 1hp pool pump is the largest I would run. I could not see where on the generator to ground the unit. Don't they all require a grounding rod to be located near the unit?

#8
11-14-05, 12:49 PM
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Join Date: Feb 2002
Location: port chester n y
Posts: 2,117
Steve:

We can arrange a meeting in order to "engineer" a sucessful project. Please be assured that any & all advise & assistance I provide is "pro bono"--- be glad to help you--

I once was the chief electrician at Stamford Hospital.

Cheers, Al B.

#9
11-14-05, 12:54 PM
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Join Date: Sep 2000
Location: United States
Posts: 18,497
Normally, we edit out email addresses in posts, and somebody may yet do so, but I'm not sure why we have this rule. If you want to open yourself up to spam, I don't know why we'd care.

#10
11-14-05, 03:22 PM
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#2cu for 62 amps @ 240v at only 130' ???
Sounds like overkill to me. #4 would be plenty.

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