Greetings, all~ <br><br>Regarding Allan's shunt question: Definitely you will need the same "ratio" for the meter logic to work right.<br><br>I have purchased from AEE Solar a 1000 amp shunt that drops 100 mv @ 1000 amps. This is the same "ratio" as a shunt that drops 50mv @ 500 amps. The photo makes this appear to be just a block of metal with no insulating base but I confirmed and found that it did arrive on a plastic base. I had to do some major mods to fit this into the Schneider XW "power distribution panel" because the overall height and other dimensions are different, but it worked out.<br>
<br>I do not recall the part number for this but the AEEsolar website has a pretty good search function. Allan, you may contact me off list as always if I may assist further. <br><br>Jolliness,<br><br clear="all">Mick Abraham, Proprietor<br>
<a href="http://www.abrahamsolar.com" target="_blank">www.abrahamsolar.com</a><br><br>Voice: 970-731-4675<br>
<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
1. Shunt question (Allan Sindelar)<br>
<br><br>---------- Forwarded message ----------<br>From: Allan Sindelar <<a href="mailto:allan@positiveenergysolar.com">allan@positiveenergysolar.com</a>><br>To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
Cc: <br>Date: Tue, 31 Jul 2012 07:37:55 -0600<br>Subject: [RE-wrenches] Shunt question<br>
<div bgcolor="#FFFFFF" text="#000000">
Wrenches,<br>
What are you using when you need a shunt larger than the standard
500A/50mV?<br>
<br>
The application: four Sunny Islands and a Radian in a large grid-tie
with backup system. Total current flow through B- is rated 850A
(using 125A SI DC breakers) or 1,050A (using 175A DC breakers) on a
single large battery bank. Given uncertain continuous amperage, I
should use a 1,000A shunt or even a 1,200A shunt, as Deltec
recommends never exceeding 67% of a shunt's current rating for long.
Deltec makes both; see <a href="http://www.deltecco.com/MKC-DC.html" target="_blank">http://www.deltecco.com/MKC-DC.html</a>. The
shunt will be installed inside of a Nottagutter-8, with a Midnite
shunt bus on each side. The shunt will be used with the Sunny Island
master to control overall SOC and charging parameters; there's no
plan for a Tri-Metric in this system, as a Sunny Webbox will handle
online monitoring per the customer's wishes.<br>
<br>
The 1,000 and 1,200A series MKC Deltec shunts are the same physical
dimensions as the common 500A/50mV units. However, the larger units
are still 50mV. Ralph Heisey of Bogart Engineering, in his
"Information on Shunts" reference article
(<a href="http://www.deltecco.com/MKC-DC.html" target="_blank">http://www.deltecco.com/MKC-DC.html</a>), tells us to match the ratio
of voltage drop to current - that is, just as a 500A shunt drops
50mV, a larger shunt with 1,000A flowing through it should drop
100mV. But all of the larger Deltec shunts are still rated 50mV.<br>
<br>
Who has done this and resolved the issue? What shunt did you use?<br>
<br>
Thank you,<br>
Allan <br>
<div>-- <br>
<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com" target="_blank"><font color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font face="Times New Roman, Times, serif"><br>
<span style="font-size:10pt">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new address)<br>
Santa Fe, New Mexico 87507<br>
<b><a href="tel:505%20424-1112" value="+15054241112" target="_blank">505 424-1112</a></b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a></span></font>
<p class="MsoNormal" style="margin-right:722.25pt"><span style="font-size:10pt"><b><br>
</b></span></p>
<span style="font-size:10pt">
</span> </div>
</div>
</blockquote></div>