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UB right, Tump. These things aren't exactly something you will ever
find at Home Depot! BUT, and it's a big one, if you count all the
%$!#& time and energy usually required to design, fabricate and
re-design a really good off grid system, the extra money might just be
woth it. ;-)<br>
<br>
Matt T<br>
<br>
Tump wrote:
<blockquote cite="mid6C22F24C923543A78390DCB030A45840@tumpdggfbh2yn6"
type="cite">
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<div><span class="718182213-26112008"><font color="#0000ff"
face="Arial" size="2">Matt, I have long been interested in installing
the SMA SI & SBs but I have a VERY tough time selling $9ks worth of
inverters, just to get things started.</font></span></div>
<div><span class="718182213-26112008"><font color="#0000ff"
face="Arial" size="2">In the system below I would not of hesitated in
installing the SMA SI & SB! I too agree that w/this type of
scenario described below, I would have given quite a bit of thought to
using the SMAs. Can't beat the battery charging, no charge controllers
& expandability.</font></span></div>
<div><span class="718182213-26112008"></span><span
class="718182213-26112008"><font color="#0000ff" face="Arial" size="2"> Please
if there is someone out there that has had experience w/ the SMA SI
& SB let us know if it is all that it is cracked up to be!</font></span></div>
<div><span class="718182213-26112008"><font color="#0000ff"
face="Arial" size="2">With passport in hand, I offer my help if
someone out there has a large system like this, that will be using the
SI & SB/WB type of set up.</font></span></div>
<div><span class="718182213-26112008"><font color="#0000ff"
face="Arial" size="2">TUMP</font></span></div>
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<div class="OutlookMessageHeader" align="left" dir="ltr"
lang="en-us"><font face="Tahoma" size="2">-----Original Message-----<br>
<b>From:</b> <a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Matt
Tritt<br>
<b>Sent:</b> Tuesday, November 25, 2008 9:21 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] More on AC coupling<br>
<br>
</font></div>
I am curious as to why OutBacks were used for this system instead of
using SunnyIslands and SunnyBoys? From what I can tell about the SI
system, virtually no aspect of battery charging, auto gen-start/stop,
and interactive inverter control has been overlooked - or remains to be
engineered in the field by the installer. Because SunnyIslands have the
ability to "talk" to Sunny (or Windy)Boys, excess energy is taken care
of by "integrated load shedding" - no need for multiple relays,
dumpoads and voltage sensors. :-) The only limitation to these systems
(and only in 60 Hz land) is a maximum of 20 kW single, and 15 kW three
phase per autonomous load. I really like the flexibility of being able
to connect all AC inputs on the same line, as well as having the option
to do direct battery charging from a DC source (as long as you use a
shunt to measure current).<br>
<br>
I know this doesn't answer your questions, but for similar applications
in the future it would be good to take a close look at the SunnyIsland
system. They're cool.<br>
<br>
<br>
<br>
Matt T<br>
<br>
Mark Dickson wrote:
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;">Hello
Wrenches,<O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;">On the heels
of the previous thread:<O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;">We just got
finished installing a system that utilizes an Outback Quad stack and a
5.2kW array coupled to the AC panel via a Fronius IG5100--due to a long
home-run. The VFX’s are wired into the home in their traditional
manner, providing the “grid” for the Fronius. As the solar comes in,
excess power not used in the home back feeds the batteries through the
VFX’s. I have a series of relays operating dump loads and finally a
power cut-off for when the batteries reach critical level. We
installed the system yesterday and turned it on for a test run (then
back off to power it up in 2009 for the ITC’s)—it worked great!<O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;">I have a
couple questions for you all:<O:P></O:P></span></font></p>
<ul style="margin-top: 0in;" type="disc">
<li class="MsoNormal" style="color: navy;"><font color="navy"
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Seems how we are back
feeding the inverters and forfeiting their charge control, where would
you set the dump loads to kick on?</span></font> <font face="Arial"
size="2"><span style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font>
<ul style="margin-top: 0in;" type="circle">
<li class="MsoNormal" style="color: navy;"><font
color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">For now I have them set
at: 1<sup>st</sup> load to kick on at float voltages, 2<sup>nd</sup> to
kick on at bulk voltages and 3<sup>rd</sup> to kick the solar power off
at the EQ voltages. Does this make sense? The bank is made up of
Rolls 4ks-25ps batteries.</span></font> <font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font></li>
</ul>
</li>
<li class="MsoNormal" style="color: navy;"><font color="navy"
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Following a recent
discussion on the Wrenches list with a similar system: Do I need to
worry about back feeding the generator if it is runnin in the morning
when the sun comes up? Do I need a relay that will shut it down when
solar comes on line?</span></font> <font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font>
</li>
<li class="MsoNormal" style="color: navy;"><font color="navy"
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I plan on setting the
Absorb and Float set times to a miimum. Would you recommend this?</span></font>
<font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font></li>
</ul>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; color: navy; font-family: Arial;">Thanks for
your input!<O:P></O:P></span></font></p>
<div>
<div>
<div>
<p class="MsoNormal"><font color="navy" face="Comic Sans MS"
size="2"><span
style="font-size: 10pt; color: navy; font-family: 'Comic Sans MS';"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Comic Sans MS"
size="2"><span
style="font-size: 10pt; color: navy; font-family: 'Comic Sans MS';">Mark
Dickson</span></font><font color="navy"><span style="color: navy;"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font color="navy" face="Comic Sans MS"
size="2"><span
style="font-size: 10pt; color: navy; font-family: 'Comic Sans MS';">Oasis
Montana Inc.</span></font><font color="navy"><span style="color: navy;"><O:P></O:P></span></font></p>
</div>
</div>
</div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><O:P></O:P></span></font></p>
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Internal Virus Database is out of date.
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Internal Virus Database is out of date.
Checked by AVG - <a class="moz-txt-link-freetext" href="http://www.avg.com">http://www.avg.com</a>
Version: 8.0.175 / Virus Database: 270.9.4/1794 - Release Date: 11/17/2008 8:48 AM
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