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<DIV>So help me out with a little more detail please. Example (Dan's
configuration and my current in-progress install): 2 Strings of 8, L-16s
for 48V. nom. Destination: the common pos bus at the bottom of a pair of
125 amp CBs as OCP for 2, VFX3648s. </DIV>
<DIV> </DIV>
<DIV> Positive battery current path:
from each end of both battery string pos terminals, the next stop would be
a (110 amp?) Class T fuse, one for each cable/string. Then cables
from each of these fuses would land on one Bus (hefty chunk of copper bar
stock) mounted on inside of battery box (backed up with Dan's cement board),
combining the outputs of both batt strings. From this one bus, run 2
cables to the pos bus at the bottom of the 2, 125 Amp CB's (in this case
provided in the OB-DC Flex enclosure, protecting the 3648s.</DIV>
<DIV> </DIV>
<DIV> A little simpler (better?) would be
to just bolt the Class T fuses right to the bus in the battery box, eliminating
some cable. Feedback?...and thanks,</DIV>
<DIV> </DIV>
<DIV>Bill</DIV>
<DIV>Feather River Solar Electric<BR>4291 Nelson St.<BR>Taylorsville, CA
95983<BR>530.284.7849 / 6544 fax</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=danbob88@gmail.com href="mailto:danbob88@gmail.com">Dan Fink</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=Allan@positiveenergysolar.com
href="mailto:Allan@positiveenergysolar.com">Allan Sindelar</A> ; <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, February 08, 2014 12:05
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] DC
Fusing/Breakers for Battery Circuits</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>Allan;
<DIV>It's a topic much on my mind recently and i will provide a writeup soon.
It's all very well documented. I do have photos, but they don't show the fire
damage to the wooden battery box unfortunately, the client was a bit flustered
getting all the batteries out of there after the incident and when I showed up
he had already demo-ed the box. But the photos of the batteries themselves do
tell the story rather well. </DIV>
<DIV>There was another issue also.....his Xantrex power panel was wired with a
'self destruct switch' main battery cutoff. I did not design or install the
panel. But his logical reaction in seeing smoke coming out of his battery box
was to open the main battery disconnect breaker on the panel, which then put
solar 140vdc onto the inverters inputs. Both were zorched by high
voltage. He should have opened the solar breaker first, then the main DC. His
homeowner's unsurance did cover most of it all.</DIV>
<DIV>The batteries were 8 years old....end of lifespan situation.</DIV>
<DIV>Lessons learned......OCP on parallel battery strings, and cement board
liner in all battery boxes, if they are field built wooden.</DIV></DIV>
<DIV class=gmail_extra><BR clear=all>
<DIV>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<BR><BR> </DIV><BR><BR>
<DIV class=gmail_quote>On Fri, Feb 7, 2014 at 10:36 AM, Allan Sindelar <SPAN
dir=ltr><<A href="mailto:allan@positiveenergysolar.com"
target=_blank>allan@positiveenergysolar.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<DIV text="#000000" bgcolor="#FFFFFF">
<DIV>Dan,<BR>Do you have a writeup on that event? Any photos? I have many
plywood battery enclosures in the field.<BR>Thanks,
<DIV class=""><BR>Allan<BR><BR>
<DIV><U></U><U></U><U></U><U></U><U></U>
<DIV>
<P class=MsoNormal><B>Allan <SPAN>Sindelar</SPAN></B><BR><SPAN
style="FONT-SIZE: 10pt"><A href="mailto:Allan@positiveenergysolar.com"
target=_blank><U><SPAN
style="COLOR: #000099">Allan@positiveenergysolar.com</SPAN></U></A></SPAN><BR><SPAN
style="FONT-SIZE: 10pt">NABCEP Certified PV Installation
Professional<BR>NABCEP Certified Technical Sales Professional<BR>New Mexico
EE98J Journeyman Electrician<BR>Founder, <B>Positive Energy,
Inc.<U></U><U></U></B></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">A Certified B
<SPAN>Corporation<SUP><SPAN
style="FONT-SIZE: 7.5pt">TM</SPAN></SUP></SPAN><BR><U></U><U></U>3209
Richards Lane<U></U><BR><U></U>Santa Fe<U></U>, <U></U>New Mexico<U></U>
<U></U>87507<U></U><U></U><BR><B><A href="tel:505%20424-1112" target=_blank
value="+15054241112">505 424-1112</A> office 780-2738 cell</B><BR><A
href="http://www.positiveenergysolar.com/"
target=_blank><U>www.positiveenergysolar.com</U></A><U></U><U></U></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt"><SPAN></SPAN></SPAN> </P></DIV><U></U><U></U><U></U><U></U><U></U></DIV></DIV>
<DIV>
<DIV class=h5>On 2/7/2014 10:26 AM, Dan Fink wrote:<BR></DIV></DIV></DIV>
<BLOCKQUOTE type="cite">
<DIV>
<DIV class=h5>
<DIV dir=ltr>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.
<DIV>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. </DIV>
<DIV><BR>
<DIV class=gmail_extra><BR clear=all>
<DIV>Dan Fink,<BR>Executive Director;<BR>Otherpower<BR>Buckville Energy
Consulting<BR>Buckville Publications LLC<BR>NABCEP / IREC accredited
Continuing Education Providers<BR><A href="tel:970.672.4342" target=_blank
value="+19706724342">970.672.4342</A><BR><BR></DIV></DIV></DIV></DIV><BR>
<FIELDSET></FIELDSET> <BR></DIV></DIV>
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