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<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>The normal UL DC rating on the Square D
QOU breakers is 50VDC but that is with a fairly high interrupt current (i.e. for
battery/load circuits). As part of the UL listing process for the APT power
center the breakers were evaluated for use up to 100 VDC with low interrupt
current levels – i.e. PV arrays. The switchover to the Heinemann
breakers was done for other reasons and they also allow higher open circuit
voltages – up to 165VDC. </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>So – I would not be concerned about using
the existing Square D QOU breakers as long as the open circuit voltage of the
PV array doesn’t exceed the 100 VDC level. </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Christopher</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Christopher Freitas</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Director of Research and Development
</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>OutBack Power Systems, Inc.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="mailto:cfreitas@outbackpower.com"><font
size=3 color=black><span style='font-size:12.0pt;color:black'>cfreitas@outbackpower.com</span></font></a></span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Tel 360 435 6030</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Cell 360 202 4239</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><font color=navy><span style='color:navy'>19009 62<sup>nd</sup>
Ave NE</span></font><font color=navy><span style='color:navy'> </span></font></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><font color=navy><span style='color:navy'>Arlington</span></font><font
color=navy><span style='color:navy'> </span></font><font color=navy><span
style='color:navy'>WA</span></font><font color=navy><span style='color:navy'> </span></font><font
color=navy><span style='color:navy'>98223</span></font><font color=navy><span
style='color:navy'> </span></font><font color=navy><span style='color:navy'>USA</span></font></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="http://www.outbackpower.com/"><font
size=3 color=black><span style='font-size:12.0pt;color:black'>www.outbackpower.com</span></font></a></span></font></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Allan Sindelar<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, January 01, 2009
7:16 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'RE-wrenches'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] Pulse
250 power center</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Bob and Joel,</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Depends on the powercenter model. Only the oldest APT/Ananda models
used Square D QOU breakers for DC. APT's later units (the 4B) used QOU only for
AC, and used Heinemann CF for DC. By the time the brand was Pulse all DC
breakers were Heinemann (or maybe equivalent Airpax), and thus rated 125V DC.</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>The bigger problem was that the later models (and other
models too) lacked sufficient breaker spaces; the 4B had 5. With 2 for PV
input, 2 for PVGFP, and 1 for DC loads, that left no room for expansion.</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>By the way, what is the name of the most recent iteration of Pulse,
that followed Connect Energy? Just a few years ago, they were developing a 48V
grid-tied with batteries inverter. I had also heard that they had none of the
earlier personnel, just the name and intellectual property, and were to be
approached very cautiously.</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Allan</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>robert ellison</span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>The better bet is the MPPT controller but keep in mind that the
original breakers are not rated for the series panel strings that we use now.
The Square D breakers are only UL rated for 50 volts not the typical 70 - 96
volts we see now.</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Here's to a great new year,</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Bob</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> On Wed, Dec 31, 2008 at 1:26 PM, Joel Davidson <<a
href="mailto:joel.davidson@sbcglobal.net">joel.davidson@sbcglobal.net</a>>
wrote:</span></font></p>
</div>
<blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;
margin-left:4.8pt;margin-right:0in'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi Allan,<br>
<br>
Good idea bypassing the old charge controller. I'll pass it on to our customer.<br>
<br>
...and good memory. The Ananda people did the PV industry a real service by
making the first UL listed power center.</span></font></p>
</blockquote>
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