<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">Copper conduction losses are proportional
to (current) x (current) x (resistance). For the same wire gauge,
double the current means that the losses increase by 4X.</font>
<br>
<br><font size=2 face="sans-serif">Going from 150 VDC to 300 VDC will therefore
allow you use 4X thinner wire and going up to 600 VDC will allow you to
use 16X thinner wire.</font>
<br>
<br><font size=2 face="sans-serif">It's very non-linear.</font>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
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<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Jerry Shafer <jerrysgarage01@gmail.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <RE-wrenches@lists.re-wrenches.org>,
</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">07/22/2015 11:52 AM</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">[RE-wrenches] DC conductor line loss
numbers</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
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<hr noshade>
<br>
<br>
<br><font size=3>Wrenches</font>
<br><font size=3>Some time back there was discussion on the conductor size
and efficiency rating requirement for long DC runs.</font>
<br><font size=3>What I am looking at is this, 400 feet of MCM 400 to keep
the line loss at or below 1% per NEC code for an off grid application,
cost vs return is not acceptable. 2/0 is less than 2.5% and the cost is
far less. Specs are 4 strings of 3, 250 watt modules feeding one Outback
FM 80 charge controller. There are lots of things I can do like SMA instread,
or 200 VDC charge controller but nothing can be changed except the wire
gauge. Does anyone recall a thread with this topic.<br>
</font>
<br><font size=3>thoughts ??</font>
<br><font size=3>Jerry</font>
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