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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; font-family: Arial; color: navy;">Hello
Wrenches,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">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; font-family: Arial; color: navy;">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; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">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></li>
<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 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; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Thanks for
your input!<o:p></o:p></span></font></p>
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<div>
<p class="MsoNormal"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; 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; font-family: "Comic Sans MS"; color: navy;">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; font-family: "Comic Sans MS"; color: navy;">Oasis
Montana
Inc.</span></font><font color="navy"><span style="color: navy;"><o:p></o:p></span></font></p>
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<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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