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Joel,<br>
<br>
Changing any wires connected to a SW to solid core would be virtually
impossible because of the almost impossible to connect with stranded
wire connection blocks. Remember how ^$*! tight the spaces are in those
babies? Living with a marginally relevant inefficiency from stranded
seems a low price to pay for being able to connect the bits and pieces
to each other. Non?<br>
<br>
Matt T<br>
<br>
Joel Davidson wrote:
<blockquote cite="midEA0A8373D3754D05BAB0FF5765BC62FF@JOEL" type="cite">Dave,
I agree. but are we talking about 2% voltage drop, resistance, or power
loss?
<br>
<br>
What I got from this discussion about solid vs. stranded wire (1) use
solid copper wire and (2) keep I2R losses low and (3) if you use
stranded wire, be very diligent when tightening connectors. Anything
else?
<br>
<br>
Wrenches make design compromises every day. My 11 year old grid-tied
system is an example:
<br>
- Siemens SP70 modules because SP75s were unavailable.
<br>
- Trace SW4048 at 65% efficiency because higher efficiency non-battery
inverters were less reliable.
<br>
- Low-rise, low-tilt angle array because Culver City did not allow PV
arrays to be visible from the street.
<br>
- And now, making improvements on a system that is working flawlessly
for almost 100,000 hours does not make cost vs. benefits sense.
<br>
<br>
Joel Davidson
<br>
<br>
<br>
----- Original Message ----- From: "Dave Click"
<a class="moz-txt-link-rfc2396E" href="mailto:daveclick@fsec.ucf.edu"><daveclick@fsec.ucf.edu></a>
<br>
To: "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
Sent: Wednesday, August 05, 2009 5:58 AM
<br>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
<br>
<br>
<br>
<blockquote type="cite">2% loss is significant, but I think that
Darryl was saying that the resistance for stranded wire was 2% higher
than solid. So if you had a 3% voltage drop in your system with
stranded wire, you could rewire the system with solid wire and have a
voltage drop of (3% x 0.98) 2.94% at peak production; that's less than
1 kWh/yr per kW installed.
<br>
<br>
DKC
<br>
<br>
-------- Original Message --------
<br>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
<br>
From: Joel Davidson <a class="moz-txt-link-rfc2396E" href="mailto:joel.davidson@sbcglobal.net"><joel.davidson@sbcglobal.net></a>
<br>
To: RE-wrenches <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
Date: 2009/8/3 20:31
<br>
<br>
<blockquote type="cite">2% loss from any resistance source over 25
years is significant.
<br>
<br>
----- Original Message ----- From: "Darryl Thayer"
<a class="moz-txt-link-rfc2396E" href="mailto:daryl_solar@yahoo.com"><daryl_solar@yahoo.com></a>
<br>
To: "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
Sent: Monday, August 03, 2009 2:04 PM
<br>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
<br>
<br>
<br>
<br>
Yes, that is what the code book and my electricians handbook says, but
2% is very little. I would think that passing through a conduit hole
is larger than that.
<br>
Darryl
<br>
<br>
--- On Mon, 8/3/09, Matt Tritt <a class="moz-txt-link-rfc2396E" href="mailto:solarone@charter.net"><solarone@charter.net></a> wrote:
<br>
<br>
<blockquote type="cite">From: Matt Tritt
<a class="moz-txt-link-rfc2396E" href="mailto:solarone@charter.net"><solarone@charter.net></a>
<br>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
<br>
To: "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
Date: Monday, August 3, 2009, 3:49 PM
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Darryl,
<br>
<br>
<br>
<br>
Say what?! This would seem to indicate that solid core is
<br>
actually
<br>
better for DC than stranded wire. Can this possibly be
<br>
true??
<br>
<br>
<br>
<br>
Matt
<br>
<br>
<br>
<br>
Darryl Thayer wrote:
<br>
<br>
I looked in the code book and found stranded wire
<br>
has about 2% higher DC resistance than solid, Chapter 9
<br>
table 8, and that for AC resistance the same value as DC
<br>
resistance to within the table accuracy Chapter 9 Table 9
<br>
<br>
This table points out that for AC resistance it is
<br>
important to know the conduit system, as the reactance will
<br>
have an effect. With AC it is important to never allow a
<br>
single wire to pass through a metal surface as this will
<br>
induce eddy currents and magnetic effects into the metal
<br>
causing voltage drop and heating.
<br>
<br>
--- On Fri, 7/31/09, jay peltz <a class="moz-txt-link-rfc2396E" href="mailto:jay@asis.com"><jay@asis.com></a>
<br>
wrote:
<br>
<br>
<br>
<br>
From: jay peltz <a class="moz-txt-link-rfc2396E" href="mailto:jay@asis.com"><jay@asis.com></a>
<br>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
<br>
To: "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
Date: Friday, July 31, 2009, 10:01 PM
<br>
Hi Darryl,
<br>
<br>
But what are the differences and when do they come into
<br>
play?
<br>
<br>
<br>
<br>
<br>
On Jul 31, 2009, at 7:25 PM, Darryl Thayer wrote:
<br>
<br>
<br>
<br>
Well there is very slight differences between AC
<br>
and
<br>
<br>
<br>
Dc But this
<br>
<br>
<br>
difference
<br>
is so slight that it has no effect on anything we will
<br>
<br>
<br>
do.
<br>
<br>
<br>
Darryl
<br>
--- On Fri, 7/31/09, jay peltz <a class="moz-txt-link-rfc2396E" href="mailto:jay@asis.com"><jay@asis.com></a>
<br>
<br>
<br>
wrote:
<br>
<br>
<br>
<br>
From: jay peltz <a class="moz-txt-link-rfc2396E" href="mailto:jay@asis.com"><jay@asis.com></a>
<br>
Subject: [RE-wrenches] solid vs stranded AC
<br>
<br>
<br>
<br>
vs DC
<br>
<br>
<br>
<br>
To: "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
Date: Friday, July 31, 2009, 7:00 PM
<br>
HI All,
<br>
<br>
I'm trying to understand this wire issue.
<br>
<br>
Whether or not there is a difference between
<br>
<br>
<br>
<br>
stranded or
<br>
<br>
<br>
<br>
solid wire for DC or AC.
<br>
<br>
Any takers on this one?
<br>
<br>
thanks,
<br>
<br>
jay
<br>
<br>
peltz power
<br>
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<pre wrap="">
<hr size="4" width="90%">
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Version: 8.5.392 / Virus Database: 270.13.44/2283 - Release Date: 08/05/09 05:57:00
</pre>
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