<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Boltswitch used to make pullout discos
for the smaller R fuses too. You can use them, but they are a
time delay fuse, so you need to look at trip curves for sizing
(don't just substitute the same amp rated RK5 for a T)<br>
The R fuses are physically much larger, and are rated to 300 vdc,
class T to 160 vdc. The AIC ratings seem to be similar 20,000
amps, though.<br>
<br>
I would favor the Boltswitch pullout with T fuses for these
reasons:<br>
1) its lower cost<br>
2) It will trip faster than any breaker or RK5 in an actual fault.<br>
3) It takes up much less space than 3 breakers in their own
enclosure.<br>
4) It disconnects 3 strings with one move.<br>
5) The fuses and holder would handle corrosion better than the
complicated internal workings of a breaker<br>
(my opinion: not proven fact)<br>
<br>
I should also add that I'm normally a big fan of breakers, and
would still have inverter disconnect breakers in the system as
well. I'm only advocating the class T Bolt switch solution for
fusing separate parallel battery strings, close to the battery
box.<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 2/11/2014 11:32 AM, August Goers wrote:<br>
</div>
<blockquote
cite="mid:71f00bdd6a09a42239c2dac24a393c08@mail.gmail.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 12 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
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:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#44546A;}
span.EmailStyle20
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#44546A;}
span.EmailStyle21
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#44546A;}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#44546A;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style>
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Hi
Wrenches,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">I’ve
seen a lot of posts lately all mentioning Class T for
battery fusing. Does anyone know if Class R is acceptable
for battery fusing? I looked back at an old John Wiles doc
and it seems like RK5 is fine, but would like to hear your
opinion. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"><a
moz-do-not-send="true"
href="http://www.nmsu.edu/%7Etdi/pdf-resources/cc67.pdf">http://www.nmsu.edu/~tdi/pdf-resources/cc67.pdf</a></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">-August</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<div>
<div style="border:none;border-top:solid #b5c4df
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal">
<b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
August Goers [mailto:<a moz-do-not-send="true"
href="mailto:august@luminalt.com">august@luminalt.com</a>]
<br>
<b>Sent:</b> Friday, February 07, 2014 4:36 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> RE: [RE-wrenches] DC Fusing/Breakers for
Battery Circuits</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Hi
All,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Correction:
Another Wrench member contacted me off-list and noticed that
we have a class RK5 in one photo and a T in the other photo.
This opens up the question of whether one or both are
correct or incorrect. I think both are rated for 20k AIC for
DC voltage but I’ll have to look through my order records to
be certain. The R is slow acting and the T is fast acting. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Best,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">August</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<div>
<div style="border:none;border-top:solid #b5c4df
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal">
<b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
August Goers [<a moz-do-not-send="true"
href="mailto:august@luminalt.com">mailto:august@luminalt.com</a>]
<br>
<b>Sent:</b> Friday, February 07, 2014 3:32 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> RE: [RE-wrenches] DC Fusing/Breakers for
Battery Circuits</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Hi
Dan,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">I’ve
been wondering the same think. We’ve been fusing with a
class T in the battery box and grounding the negative side
of the batteries. See attached pics. Do you feel that the
fuses should be outside of the battery box?</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Best,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">August</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Luminalt
Energy</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p>
<div style="border:none;border-top:solid #b5c4df
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal">
<b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Dan Fink<br>
<b>Sent:</b> Friday, February 07, 2014 9:27 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] DC Fusing/Breakers for
Battery Circuits</span></p>
</div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Does anyone have any elegant solutions to
this? It's really time consuming and ugly to run big
parallel battery string wires *out* of the battery enclosure
to class T fuses, then back into the battery box. It looks
very ugly and DIY, and in conduit adds a few hundred to the
install cost just for labor. The Class T fuses and blocks
themselves are not particularly expensive.</p>
<div>
<p class="MsoNormal">I have been recommending parallel
fusing on battery banks of 2x8 L16s and over now, after a
nearly tragic incident with a bad cell that shorted. The
(perfectly legal) wooden battery box made the fire much
worse. A pet peeve of mine. </p>
</div>
<div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal"><br clear="all">
</p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Dan
Fink,<br>
Executive Director;<br>
Otherpower<br>
Buckville Energy Consulting<br>
Buckville Publications LLC<br>
NABCEP / IREC accredited Continuing Education
Providers<br>
970.672.4342</p>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
List sponsored by Home Power magazine
List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>
Change 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</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 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>