[RE-wrenches] DC conductor line loss numbers

Jarmo.Venalainen at schneider-electric.com Jarmo.Venalainen at schneider-electric.com
Wed Jul 22 16:09:45 PDT 2015


Hi:

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.

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.

It's very non-linear.

JARMO
_____________________________________________________________________________________ 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalainen at schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 








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From:
Jerry Shafer <jerrysgarage01 at gmail.com>
To:
RE-wrenches <RE-wrenches at lists.re-wrenches.org>, 
Date:
07/22/2015 11:52 AM
Subject:
[RE-wrenches] DC conductor line loss numbers
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>



Wrenches
Some time back there was discussion on the conductor size and efficiency 
rating requirement for long DC runs.
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.

thoughts ??
Jerry

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