<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body style="background-color: rgb(255, 255, 255); color: rgb(0, 0,
0);" bgcolor="#FFFFFF" text="#000000">
As a matter of course I have always run the positive and negative
conductors of high-current cable pairs together, but have never
deliberately twisted them, and have never known of any related
problems. <br>
The most obvious example of this would be 4/0 battery/inverter
cables in a 24V system, with a 250A GJ-class breaker or (prior to
that) a 300A or 400A Class T fuse. It's pretty tough to thread a
twisted pair of 4/0 USE/RHH/RHW cables through a 2" elbow or LB from
inverter enclosure to battery enclosure.<br>
I'm not an EE, but I can't see what difference twisting would make
in the absence of a building/collapsing field as is normal with AC.
<br>
I have twisted AC conductors together in the past when clients have
expressed concerns about EMF from their equipment and wiring, but
only AC.<br>
Allan<br>
<br>
<div class="moz-signature">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="ProgId" content="Word.Document">
<meta name="Generator" content="Microsoft Word 12">
<meta name="Originator" content="Microsoft Word 12">
<link rel="File-List" href="AllanSSsig_files/filelist.xml">
<!--[if gte mso 9]><xml>
<o:DocumentProperties>
<o:Author>pe</o:Author>
<o:Template>Normal</o:Template>
<o:LastAuthor>Allan Sindelar</o:LastAuthor>
<o:Revision>4</o:Revision>
<o:TotalTime>6</o:TotalTime>
<o:Created>2014-04-14T17:20:00Z</o:Created>
<o:LastSaved>2014-04-14T19:21:00Z</o:LastSaved>
<o:Pages>1</o:Pages>
<o:Words>41</o:Words>
<o:Characters>238</o:Characters>
<o:Company>pe</o:Company>
<o:Lines>1</o:Lines>
<o:Paragraphs>1</o:Paragraphs>
<o:CharactersWithSpaces>278</o:CharactersWithSpaces>
<o:Version>12.00</o:Version>
</o:DocumentProperties>
</xml><![endif]-->
<link rel="themeData" href="AllanSSsig_files/themedata.thmx">
<link rel="colorSchemeMapping"
href="AllanSSsig_files/colorschememapping.xml">
<!--[if gte mso 9]><xml>
<w:WordDocument>
<w:TrackMoves>false</w:TrackMoves>
<w:TrackFormatting/>
<w:ValidateAgainstSchemas/>
<w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid>
<w:IgnoreMixedContent>false</w:IgnoreMixedContent>
<w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText>
<w:DoNotPromoteQF/>
<w:LidThemeOther>EN-US</w:LidThemeOther>
<w:LidThemeAsian>X-NONE</w:LidThemeAsian>
<w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript>
<w:Compatibility>
<w:BreakWrappedTables/>
<w:SnapToGridInCell/>
<w:WrapTextWithPunct/>
<w:UseAsianBreakRules/>
<w:DontGrowAutofit/>
<w:SplitPgBreakAndParaMark/>
<w:DontVertAlignCellWithSp/>
<w:DontBreakConstrainedForcedTables/>
<w:DontVertAlignInTxbx/>
<w:Word11KerningPairs/>
<w:CachedColBalance/>
</w:Compatibility>
<w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel>
<m:mathPr>
<m:mathFont m:val="Cambria Math"/>
<m:brkBin m:val="before"/>
<m:brkBinSub m:val="--"/>
<m:smallFrac m:val="off"/>
<m:dispDef/>
<m:lMargin m:val="0"/>
<m:rMargin m:val="0"/>
<m:defJc m:val="centerGroup"/>
<m:wrapIndent m:val="1440"/>
<m:intLim m:val="subSup"/>
<m:naryLim m:val="undOvr"/>
</m:mathPr></w:WordDocument>
</xml><![endif]--><!--[if gte mso 9]><xml>
<w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="false"
DefSemiHidden="false" DefQFormat="false" LatentStyleCount="267">
<w:LsdException Locked="false" QFormat="true" Name="Normal"/>
<w:LsdException Locked="false" QFormat="true" Name="heading 1"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 2"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 3"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 4"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 5"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 6"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 7"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 8"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="heading 9"/>
<w:LsdException Locked="false" SemiHidden="true" UnhideWhenUsed="true"
QFormat="true" Name="caption"/>
<w:LsdException Locked="false" QFormat="true" Name="Title"/>
<w:LsdException Locked="false" Priority="1" Name="Default Paragraph Font"/>
<w:LsdException Locked="false" QFormat="true" Name="Subtitle"/>
<w:LsdException Locked="false" QFormat="true" Name="Strong"/>
<w:LsdException Locked="false" QFormat="true" Name="Emphasis"/>
<w:LsdException Locked="false" Priority="99" Name="No List"/>
<w:LsdException Locked="false" Priority="99" SemiHidden="true"
Name="Placeholder Text"/>
<w:LsdException Locked="false" Priority="1" QFormat="true" Name="No Spacing"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading"/>
<w:LsdException Locked="false" Priority="61" Name="Light List"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading Accent 1"/>
<w:LsdException Locked="false" Priority="61" Name="Light List Accent 1"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid Accent 1"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1 Accent 1"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 1"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1 Accent 1"/>
<w:LsdException Locked="false" Priority="99" SemiHidden="true" Name="Revision"/>
<w:LsdException Locked="false" Priority="34" QFormat="true"
Name="List Paragraph"/>
<w:LsdException Locked="false" Priority="29" QFormat="true" Name="Quote"/>
<w:LsdException Locked="false" Priority="30" QFormat="true"
Name="Intense Quote"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2 Accent 1"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1 Accent 1"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2 Accent 1"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3 Accent 1"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List Accent 1"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading Accent 1"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List Accent 1"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid Accent 1"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading Accent 2"/>
<w:LsdException Locked="false" Priority="61" Name="Light List Accent 2"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid Accent 2"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1 Accent 2"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 2"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1 Accent 2"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2 Accent 2"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1 Accent 2"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2 Accent 2"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3 Accent 2"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List Accent 2"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading Accent 2"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List Accent 2"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid Accent 2"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading Accent 3"/>
<w:LsdException Locked="false" Priority="61" Name="Light List Accent 3"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid Accent 3"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1 Accent 3"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 3"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1 Accent 3"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2 Accent 3"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1 Accent 3"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2 Accent 3"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3 Accent 3"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List Accent 3"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading Accent 3"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List Accent 3"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid Accent 3"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading Accent 4"/>
<w:LsdException Locked="false" Priority="61" Name="Light List Accent 4"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid Accent 4"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1 Accent 4"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 4"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1 Accent 4"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2 Accent 4"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1 Accent 4"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2 Accent 4"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3 Accent 4"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List Accent 4"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading Accent 4"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List Accent 4"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid Accent 4"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading Accent 5"/>
<w:LsdException Locked="false" Priority="61" Name="Light List Accent 5"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid Accent 5"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1 Accent 5"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 5"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1 Accent 5"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2 Accent 5"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1 Accent 5"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2 Accent 5"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3 Accent 5"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List Accent 5"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading Accent 5"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List Accent 5"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid Accent 5"/>
<w:LsdException Locked="false" Priority="60" Name="Light Shading Accent 6"/>
<w:LsdException Locked="false" Priority="61" Name="Light List Accent 6"/>
<w:LsdException Locked="false" Priority="62" Name="Light Grid Accent 6"/>
<w:LsdException Locked="false" Priority="63" Name="Medium Shading 1 Accent 6"/>
<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 6"/>
<w:LsdException Locked="false" Priority="65" Name="Medium List 1 Accent 6"/>
<w:LsdException Locked="false" Priority="66" Name="Medium List 2 Accent 6"/>
<w:LsdException Locked="false" Priority="67" Name="Medium Grid 1 Accent 6"/>
<w:LsdException Locked="false" Priority="68" Name="Medium Grid 2 Accent 6"/>
<w:LsdException Locked="false" Priority="69" Name="Medium Grid 3 Accent 6"/>
<w:LsdException Locked="false" Priority="70" Name="Dark List Accent 6"/>
<w:LsdException Locked="false" Priority="71" Name="Colorful Shading Accent 6"/>
<w:LsdException Locked="false" Priority="72" Name="Colorful List Accent 6"/>
<w:LsdException Locked="false" Priority="73" Name="Colorful Grid Accent 6"/>
<w:LsdException Locked="false" Priority="19" QFormat="true"
Name="Subtle Emphasis"/>
<w:LsdException Locked="false" Priority="21" QFormat="true"
Name="Intense Emphasis"/>
<w:LsdException Locked="false" Priority="31" QFormat="true"
Name="Subtle Reference"/>
<w:LsdException Locked="false" Priority="32" QFormat="true"
Name="Intense Reference"/>
<w:LsdException Locked="false" Priority="33" QFormat="true" Name="Book Title"/>
<w:LsdException Locked="false" Priority="37" SemiHidden="true"
UnhideWhenUsed="true" Name="Bibliography"/>
<w:LsdException Locked="false" Priority="39" SemiHidden="true"
UnhideWhenUsed="true" QFormat="true" Name="TOC Heading"/>
</w:LatentStyles>
</xml><![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;
mso-font-alt:"\FF2D\FF33 \660E\671D";
mso-font-charset:128;
mso-generic-font-family:modern;
mso-font-pitch:fixed;
mso-font-signature:-536870145 1791491579 18 0 131231 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;
mso-font-charset:0;
mso-generic-font-family:roman;
mso-font-pitch:variable;
mso-font-signature:-536870145 1107305727 0 0 415 0;}
@font-face
{font-family:"\@MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;
mso-font-charset:128;
mso-generic-font-family:modern;
mso-font-pitch:fixed;
mso-font-signature:-536870145 1791491579 18 0 131231 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-unhide:no;
mso-style-qformat:yes;
mso-style-parent:"";
margin:0in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman","serif";
mso-fareast-font-family:"MS Mincho";
color:black;}
a:link, span.MsoHyperlink
{mso-style-unhide:no;
color:blue;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-unhide:no;
color:blue;}
.MsoChpDefault
{mso-style-type:export-only;
mso-default-props:yes;
font-size:10.0pt;
mso-ansi-font-size:10.0pt;
mso-bidi-font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;
mso-header-margin:.5in;
mso-footer-margin:.5in;
mso-paper-source:0;}
div.WordSection1
{page:WordSection1;}
-->
</style><!--[if gte mso 10]>
<style>
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman","serif";}
</style>
<![endif]--><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="8194"/>
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1"/>
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span style="mso-bidi-font-weight:bold">Positive
Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
style="mso-special-character:line-break">
<!--[if !supportLineBreakNewLine]--><br
style="mso-special-character:line-break">
<!--[endif]--><b><o:p></o:p></b></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<div class="moz-cite-prefix">On 6/27/2015 2:40 AM, John wrote:<br>
</div>
<blockquote cite="mid:002101d0b0b4$fc5f24c0$f51d6e40$@gosolar.co.nz"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 14 (filtered
medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
<style><!--
/* Font Definitions */
@font-face
{font-family:Cambria;
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Cambria","serif";
color:black;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Cambria","serif";color:black">That
is why for years we have been twisting those leads around
each other. I was told it was to cancel out the opposing
fields on the wires, but for whatever the correct technical
reason is, we have always twisted those heavy
wires. John V.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Cambria","serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US"> RE-wrenches
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b><a class="moz-txt-link-abbreviated" href="mailto:Jarmo.Venalainen@schneider-electric.com">Jarmo.Venalainen@schneider-electric.com</a><br>
<b>Sent:</b> Saturday, 27 June 2015 5:45 a.m.<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] Battery Bank to Inverter
Wiring<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi:</span>
<br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">From
time to time over the years I've come across systems where
the routing of DC cables between the batteries and the
inverter has been the cause of issues.</span> <br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">I'm
not referring to wire thickness or quality of terminations.
For the purposes of this discussion, just assume that wire
thickness and terminations are perfect.</span> <br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">What
I am referring to is the routing of the positive and
negative battery cables. In particular, the loop area
within the + and - cables as shown in the image below,</span>
<br>
<br>
<img id="_x0000_i1025"
src="cid:part2.01050305.03010509@sindelarsolar.com"
height="313" width="465"><br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">The
problem I've seen in systems with a large loop in the setup
is that the inverter does not provide good surge power and
can even go into low voltage shutdown during large surges.</span>
<br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Recently
this happened again and I wanted to get a better feel for
it, so I did some math. </span> <br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">For
a cable length of about 12', the loop is an inductor which
has a value of inductance of about 1 uH for side by side
cables and as much as 6 uH for cables about 1 foot apart. </span>
<br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">This
inductance is greatly multiplied by any ferrous metal in the
loop and can easily be in the range of 10's to 100's of uH.
Examples being cables which run in steel conduits or along
the steel frame of a motor home.</span> <br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Inductance
causes a voltage drop proportional to the rate at which the
current is changing. To get an idea of how large that rate
can be for typical inverters, I did surge tests with a 5kW
inverter and found that the rate of change of current can be
as high as 100A per milli-second or 100,000 Amps/second.</span>
<br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Given
that, the voltage drop of the wire inductance is then ,
Vdrop = (rate of change of current) x (inductance), </span><br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Vdrop
for 1 uH = (100,000 A/s) x (0.000001 H) = 0.1V</span> <br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Vdrop
for 10 uH = (100,000 A/s) x (0.000001 H) = 1.0V</span> <br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Vdrop
for 100 uH = (100,000 A/s) x (0.000001 H) = 10.0V clearly
this is a problem.</span> <br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Have
any of the wrenches had systems with this issue? If so, how
often.</span> <br>
<br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">JARMO</span>
<br>
<br>
<br>
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif""> <br>
</span><span style="color:green">_____________________________________________________________________________________</span>
<br>
<b><span
style="font-size:7.5pt;font-family:"Arial","sans-serif""><br>
Jarmo Venalainen</span></b><span
style="font-size:7.5pt;font-family:"Arial","sans-serif"">
| <b><span style="color:green"> Schneider Electric </span>
| Xantrex Brand</b> | <b>CANADA</b> | <b>Sales
Application Engineer</b> <b><br>
Phone:</b> +604-422-2528 | <b>Tech Support:</b>
800-670-0707 | <b>Mobile:</b> +604-505-0291 <b><br>
Email:</b> </span><a moz-do-not-send="true"
href="mailto:jarmo.venalainen@schneider-electric.com"><span
style="font-size:7.5pt;font-family:"Arial","sans-serif"">jarmo.venalainen@schneider-electric.com</span></a><span
style="font-size:7.5pt;font-family:"Arial","sans-serif"">
| <b>Site:</b></span><a moz-do-not-send="true"
href="http://www.xantrex.com/" target="_blank"><span
style="font-size:7.5pt;font-family:"Arial","sans-serif"">
www.Xantrex.com</span></a><span
style="font-size:7.5pt;font-family:"Arial","sans-serif"">
| <b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 </span><o:p></o:p></p>
<table class="MsoNormalTable" border="0" cellpadding="0">
<tbody>
<tr>
<td colspan="4" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.xantrexrebate.com/" target="_blank"><span
style="text-decoration:none"><img
id="_x0000_i1026"
src="cid:part5.01080509.03070805@sindelarsolar.com"
border="0" height="1" width="1"></span></a><o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.xantrex.com/" target="_blank"><span
style="text-decoration:none"><img
id="_x0000_i1027"
src="cid:part7.09080408.04000207@sindelarsolar.com"
border="0" height="55" width="166"></span></a><o:p></o:p></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><a moz-do-not-send="true"
href="https://www.facebook.com/Xantrex"
target="_blank"><span style="text-decoration:none"><img
id="_x0000_i1028"
src="cid:part9.05080408.05010301@sindelarsolar.com"
border="0" height="55" width="36"></span></a><o:p></o:p></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><a moz-do-not-send="true"
href="https://twitter.com/Xantrex" target="_blank"><span
style="text-decoration:none"><img
id="_x0000_i1029"
src="cid:part11.09040509.03060604@sindelarsolar.com"
border="0" height="55" width="38"></span></a><o:p></o:p></p>
</td>
<td style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><a moz-do-not-send="true"
href="https://twitter.com/Xantrex" target="_blank"><span
style="text-decoration:none"><img
id="_x0000_i1030"
src="cid:part13.08000009.08020603@sindelarsolar.com"
border="0" height="55" width="303"></span></a><o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><br>
<br>
<span
style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#00A000"><br>
*** Please consider the environment before printing this
e-mail</span><o:p></o:p></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
List sponsored by Redwood Alliance
List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a>
List rules & etiquette:
<a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a>
</pre>
</blockquote>
<br>
</body>
</html>