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<p class=MsoNormal><span style='color:#1F497D'>There is no reason that the two
inverters need to work as a team.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>We have a system in operation
since 2002 with a SW4048 and an SW5548 and 4200W of PV in a GTWB setup. Both
have SWGTIs. The two inverters are not stacked, as they support different
subpanels and load profiles and there are no 240V loads. The 4048 is set to
sell, the 5548 only to float. The 4048 can charge and EQ from the grid at 30A
AC, the 5548 is limited to 5A grid input. The 4048 is the workhorse, both
buying and selling, and the 5548 primarily runs house loads. Works like a
charm, and the two inverters don’t fight each other.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Allan Sindelar<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><a
href="mailto:Allan@positiveenergysolar.com">Allan@positiveenergysolar.com</a></span><span
style='font-size:11.0pt;color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>NABCEP
Certified Photovoltaic Installer</span><span style='font-size:11.0pt;
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>EE98J
Journeyman Electrician</span><span style='font-size:11.0pt;color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;color:#1F497D'>Positive
Energy, Inc.<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>3201 Calle
Marie<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Santa Fe, New
Mexico 87507<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>505 424-1112<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><a
href="http://www.positiveenergysolar.com/">www.PositiveEnergySolar.com</a></span><span
style='font-size:11.0pt;color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></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"'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>toddcory@finestplanet.com<br>
<b>Sent:</b> Tuesday, November 17, 2009 8:03 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] SW 4024 now grid tie<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:13.5pt'><span style='font-size:13.5pt;
font-family:"Arial","sans-serif"'>Here is an old 2001 posting from Bill
Brooks...<o:p></o:p></span></p>
<div><pre>William, Marco, and Jeff C.,<br>
<br>
Here is the method I found to be most effective:<br>
<br>
INVERTER SETUP (MENU 9)<br>
set to SELL<br>
<br>
BATTERY CHARGING (MENU 10)<br>
set ABSORPTION TIME to 0:00 on both machines.<br>
set MAX CHARGE AMPS to 1 amp on both machines.<br>
<br>
BATTERY SELLING (MENU 17)<br>
set MAX SELL AMPS to X amps on both machines. (where 2X is the Max AC amps<br>
that the PV array can produce. (e.g. 4000 Watts should set both to 18<br>
amps --18A*120V=2160Watts)<br>
<br>
Both temp comp probes must be installed so as to operate at the same<br>
temperature. I have tried adjusting the float setting and that also works<br>
particularly for an inverter that is out of DC calibration. They still get<br>
out of wack at times at different temperatures because the slope of the temp<br>
comp probes are usually not the same. This should keep both machines selling<br>
as evenly as they can and limit each machine to a maximum of half the AC<br>
Watts output. The one amp MAX charge amps keeps one unit from charging while<br>
the other one sells.<br>
<br>
Try it and see how you like it.<br>
<br>
Bill.<br>
<br>
<br>
-----Original Message-----<br>
From: William Miller [<a href="mailto:wrmiller@slonet.org">mailto:wrmiller@slonet.org</a>]<br>
Sent: Wednesday, September 26, 2001 6:19 PM<br>
To: <a href="mailto:RE-wrenches@topica.com">RE-wrenches@topica.com</a><br>
Subject: RE: system output honesty [RE-wrenches]<br>
<br>
<br>
Marco:<br>
<br>
I must not have been very clear, but you don't necessarily end up with the<br>
same numeric float voltage setting. Take the inverter with the lower<br>
output and increase it's float voltage one increment at a time (I think it<br>
adjusts in 0.2 volt increments) while checking sell amps. The change<br>
should be immediate and obvious. (If it doesn't improve, try decreasing<br>
float voltage because my memory may not be accurate.)<br>
<br>
William<br>
<br>
<br>
<br>
At 01:09 AM 9/26/01 -1000, you wrote:<o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>></span></span><span
style='color:#3333FF'>William,<br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span>Maybe you have the magic touch with your dual SWs, but my dual SWs are set<br>
<span class=moz-txt-citetags>></span>at the same float voltage and, as Bill B. noted, they don't "share" those<br>
<span class=moz-txt-citetags>></span>incoming PV electrons very equitably.<br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span>On another note, has anyone received an AEI MM5 or MM3 yet?<br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span>marco<br>
<span class=moz-txt-citetags>></span>ProVision Technologies<br>
<span class=moz-txt-citetags>></span>Hilo, land of declining tourism Hawai'i<br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span>Friends:<br>
<span class=moz-txt-citetags>></span>With dual SW inverters (I believe, if memory serves me right) I finally<br>
<span class=moz-txt-citetags>></span>discovered that adjusting the float voltage until they both sell more or<br>
<span class=moz-txt-citetags>></span>less equally does the job of balancing.<br>
<span class=moz-txt-citetags>></span>William<br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span><br>
<span class=moz-txt-citetags>></span>At 05:04 PM 9/25/01 -0700, you wrote:<o:p></o:p></span></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>>></span></span><span
style='color:#3333FF'>Jeff C.,<br>
<span class=moz-txt-citetags>>></span><br>
<span class=moz-txt-citetags>>></span>It is less important with a small array, but it still will work slightly<br>
<span class=moz-txt-citetags>>></span>better. The much bigger issue with dual inverters in sell mode is that<o:p></o:p></span></pre></blockquote>
</blockquote>
<pre>they<o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>></span></span><span
style='color:#3333FF'><o:p> </o:p></span></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>>></span></span><span
style='color:#3333FF'>don't behave nicely with each other (they don't know how to share). One<br>
<span class=moz-txt-citetags>>></span>inverter invariably wins the conversion battle and the other inverter sits<br>
<span class=moz-txt-citetags>>></span>idle, or more likely, starts drawing power from the grid to fight the<o:p></o:p></span></pre></blockquote>
</blockquote>
<pre>other<o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>></span></span><span
style='color:#3333FF'><o:p> </o:p></span></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>>></span></span><span
style='color:#3333FF'>inverter.<br>
<span class=moz-txt-citetags>>></span><br>
<span class=moz-txt-citetags>>></span>I have yet to see a dual SW system on the grid the worked really well. You<br>
<span class=moz-txt-citetags>>></span>can trick them into working with various settings. I have a set of<o:p></o:p></span></pre></blockquote>
</blockquote>
<pre>settings<o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>></span></span><span
style='color:#3333FF'><o:p> </o:p></span></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>>></span></span><span
style='color:#3333FF'>that has worked well for me, others on the list may have their own<o:p></o:p></span></pre></blockquote>
</blockquote>
<pre>methods.<o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>></span></span><span
style='color:#3333FF'><o:p> </o:p></span></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><span
class=moz-txt-citetags><span style='color:#3333FF'>>></span></span><span
style='color:#3333FF'>If people are interested, we can do this onlist. If not, email me and I'll<br>
<span class=moz-txt-citetags>>></span>send them offlist.<br>
<span class=moz-txt-citetags>>></span><br>
<span class=moz-txt-citetags>>></span>Bill.<br>
<span class=moz-txt-citetags>>></span><br>
<span class=moz-txt-citetags>>></span><o:p></o:p></span></pre></blockquote>
</blockquote>
<pre style='margin-bottom:12.0pt'><br>
<br>
__________________________________________________________________<br>
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SLO Communications: Communications and Power Systems Consulting<br>
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<o:p></o:p></pre></div>
<p class=MsoNormal style='margin-bottom:13.5pt'><span style='font-size:13.5pt;
font-family:"Arial","sans-serif"'><br>
<br>
On Tuesday, November 17, 2009 2:18pm, "Dana"
<dana@solarwork.com> said:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Hey all,</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>I have a
client who was off grid and is now grid tied and has [2] Trace SW 4024
Inverters. I realize the parameters are not the best for high efficiency but
the client is not into changing out to newer equipment.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Whom at which
telephone @ Xantrex might be the best bet to talk to for programming advice for
grid tie application for the SW 4024 inverters?</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>Dana
Orzel</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>Great
Solar Works, Inc</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>www.solarwork.com</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>E
- dana@solarwork.com</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>V
- 970.626.5253</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>F
- 970.626.4140</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>C
- 970.209.4076</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#4F81BD'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>I
will be the shift in how the world uses power! - Dana Orzel</span><o:p></o:p></p>
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