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Posted by Ralph Mowery on May 11, 2008, 6:47 pm
> On 5/11/2008 4:51 AM nicksanspam@ece.villanova.edu spake thus:
>
>>
>>>One walk-in-off-the-street price for 6-3 outdoor wire comes to about
>>>$3.50 / ft. Say 1500 feet, you're talking over $5000.
>>
>> How much for a couple of used 3 kVA 240-480V transformers and skinnier
>> wire?
>
> Interesting idea (and I see someone gave some ballpark figures down
> yonder).
>
> I'm wondering about losses: how much power would be lost in that pair of
> xformers?
Most transformers do not have very much power loss. They can be around 98%
efficent for well designed ones to 80 % for small not so well designed ones.
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Posted by Bill Kaszeta / Photovoltaic Re on May 11, 2008, 10:30 pm
On 11 May 2008 07:51:29 -0400, nicksanspam@ece.villanova.edu wrote:
>
>>One walk-in-off-the-street price for 6-3 outdoor wire comes to about $3.50 /
>>ft. Say 1500 feet, you're talking over $5000.
>
>How much for a couple of used 3 kVA 240-480V transformers and skinnier wire?
>
>Nick
>
Grainger Transformer,3 Kva = $427
Transformers have standby and load losses to consider in making the decision.
Generally, double the voltage = 1/4 the wire cost for the same loss.
Bill Kaszeta
Photovoltaic Resources Int'l
Tempe Arizona USA
bill@pvri-removethis.biz
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Posted by Stormin Mormon on May 15, 2008, 3:06 pm
For that load, and for that distance, a generator may be more practical.
Honda are rather quiet.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
I have a few questions that involve simple electrical wire theory, but the
situation gets a little bit complicated.
I am trying to run an extension cord (or cords) into the woods to power a
stage, with fairly powerful musical equipment, lights, PA, etc.
I'm assuming the power outlets that will be available are standard
grounded 120 Volt, hopefully on the heavy duty side. The equipment I'm
looking to power totals several thousand watts (rated at, lets say, 3000
W). However, the power draw is not consistent... it fluctuates with how
hard the equipment is being pushed from moment to moment.
The distance is more than 1000 feet (probably more like 2000 ft). If I
were to buy a single cord that is suitable for this job, I'm guessing the
outlet itself would be the limiting factor in terms of resistance and
heat, and I don't want to start any fires. I'm not even sure if a wire
that is a large enough gauge would even come with the standard outlet
plug.
At this power draw and distance, even several 120-V outlets might not do
the job, if the wire that runs from the power lines to the outlet box (or
any internal wiring) is not a heavy enough gauge. For this type of job,
do I need to look into other methods of getting enough power from the pole
besides running several extension cords?
Does anyone have any specific advice on how to tackle this problem? (i.e.
what type of gauge wire, how many extension cords, how to correctly tap
the power lines, etc.)
Your help is most appreciated.
-Dave
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