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Old 05-04-2010, 11:05 AM   #1
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Electric Wire question


I have a question. I was hoping you guys could help me with.
I need to run a water pump in my pond. The pond is located almost 800' from my panel in the house. I was going to bury the wire hoping to do a direct burial. The pump is somewhat small it uses 1.3 amps 150 watts.
How heavy of a wire would I have to use for this length to safly run the water pump.

Thanks in advance for any suggestions.
Mike
Wild Thyme Woodworking

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Old 05-04-2010, 11:18 AM   #2
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With my calculations I end up with #10 for a 3% voltage drop.

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Old 05-04-2010, 11:41 AM   #3
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You may want to consider solar after you price the wire!
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Old 05-04-2010, 11:48 AM   #4
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I wish I new more about solar. The problem is the pump needs to run 24 hours a day and even through the winter. Do you know what I would need to make up a solar pacage that could do this? I am willing to clean off the panels when ever I need to ie after it snows. The area does have direct view to the south.
The wire would have to be purched in 1000' roll and it is almost $1000 bucks!!
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Old 05-04-2010, 11:53 AM   #5
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I'm thinking solar charger, deep cycle battery and an inverter.
The charger is the one you may have trouble designing.
It has to be larger than a trickle charger.

Check Bass Pro shops for some chargers.
Others may have better ideas.
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Old 05-04-2010, 12:49 PM   #6
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1.3 A, 5% drop @ 120v gives 6v/1.3A = 4.6 ohms for the cable resistance.
With 1600' conductor length, 4.6 ohms/1600' = 2.9 milliohms per foot. I get #14, copper.
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Old 05-04-2010, 01:31 PM   #7
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Are you allowed 5% voltage drop on a branch circuit according the NEC.

The CEC only allows us a 3% voltage drop.
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Old 05-04-2010, 02:49 PM   #8
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Quote:
Originally Posted by darren View Post
Are you allowed 5% voltage drop on a branch circuit according the NEC.

The CEC only allows us a 3% voltage drop.
Dunno'; for us in the US it might be 5% total from the load center to the farthest outlet.
I know extension cords seem to go with a 5% max drop so apparently most equipment can tolerate this much resistance in the supply line. And this is on top of the 120v +/-5% or +/- 10% available at the outlet.

He could also use 150w step-up and a step-down transformers at the ends but thicker cable may be cheaper. If you're happy with #14 then using 240v over the distance would need about 17 AWG copper.

Or get a 240v, 0.7A pump.

8 hrs sun/16 hrs without, and we need 24(150w) = 3600 w-h and we have <8 hours to get it, so 3600/8 = >450w solar panel = >3 sq. meters.

Worst case cost is one kilobuck. We can beat that price!

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Old 05-04-2010, 03:01 PM   #9
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I think the OP should look into getting a similar size motor but make it 240V. This would greatly help his voltage drop issues.

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