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<p class=MsoNormal><span style='color:#1F497D'>A Fronius Inverter can be AC
coupled with a Sunny Island just fine. The only thing to keep in mind is, that
when the SI starts the FSPC, the Fronius unit will go offline with a Frequency
A/C error. Wait five minutes, then try to reconnect, it will not reconnect
until the SI lowers the FSPC to below 60.5Hz. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I don’t know if Fronius
has an “off-grid” mode, but if so, you could also place the unit in
this mode. It should open the parameters, which will allow for the FSPC to work
correctly. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>With FSPC, it is a range of +
2Hz from the nominal system frequency that it will occur in. The nominal
Hz can be adjusted in the SI, but is almost always left at 60Hz<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>IE: Grid fails, SI is generating
a frequency of 60Hz. Batteries are charged, and loads in the protected loads
panel are low. The SI will start the FSPC and raise one Hz to 61Hz, if the load
demand continues to drop the FSPC will continue to rise to 62Hz, thus forcing the
PAC on the Sunny Boy to drop to 0W. Both the FAC-Start-Delta (the point where
the PAC will start to drop), and FAC-Limit-Delta (the range of the PAC drop)
can be adjusted. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><img width=383 height=181
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>SMA America, LLC<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Steve Jefferson<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Sr. Technical Service Specialist, Sunny Family</span></i><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Service Line +1 877 697 6283 (Toll Free)<o:p></o:p></span></p>
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normal'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Email: steve.jefferson@sma-america.com<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
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<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Gary
Willett<br>
<b>Sent:</b> Wednesday, April 13, 2011 3:06 AM<br>
<b>To:</b> Mark Frye<br>
<b>Cc:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks Mark for educating me about FSC.<br>
<br>
Reading SMA docs, FSC allows the Sunny Boy's AC output to be varied from
maximum to zero when the<br>
Sunny Island varies its AC output frequency between 60Hz and 61Hz.<br>
<br>
Based on your response - do you - or any other Wrenches - have any experience
AC coupling the <br>
Fronius inverters? Do they have any problem maintaining connectivity to the
"local" grid <br>
when the big grid is down? Are there any battery-based inverter/chargers that
Fronius does not like?<br>
<br>
I don't want to be on the "bleeding edge" and be the first one to
ever design an AC coupled battery<br>
backup system using Fronius. I will call Fronius support next, but any feedback
from the group will <br>
be much appreciated.<br>
<br>
<span style='font-size:10.0pt;line-height:115%'>Gary Willett, PE<br>
<span class=spelle>Icarus</span> Solar Services LLC</span><br>
<br>
<o:p></o:p></p>
<p class=MsoNormal><br>
On 4/12/2011 11:37 PM, Mark Frye wrote: <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;line-height:115%;font-family:
"Arial","sans-serif";color:blue'>Gary,</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;line-height:115%;font-family:
"Arial","sans-serif";color:blue'>I have been looking at some AC coupled stuff
lately. The "FSC" is propriatary to SMA, Sunny Island to Sunny
Boy. Pretty much anything else you need something to sense the voltage of
the battery bank so you can open a contactor on the AC line to the Fronius when
the battery voltage gets too high. Once the voltage drops the contactor can
close and bring the Fronius back on line and then the 5-minute start up delay
before it is feeding the line again.</span><o:p></o:p></p>
<p class=MsoNormal><br>
<span style='font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif"'>Mark
Frye</span> <br>
<span style='font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif"'>Berkeley
Solar Electric Systems</span> <br>
<span style='font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif"'>303
Redbud Way</span> <br>
<span style='font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif"'>Nevada
City, CA 95959</span> <br>
<span style='font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif"'>(530)
401-8024</span> <br>
<a href="http://www.berkeleysolar.com/"><span style='font-size:10.0pt;
line-height:115%;font-family:"Arial","sans-serif"'>www.berkeleysolar.com</span></a><span
style='font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif"'> </span>
<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
line-height:115%;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;line-height:115%;font-family:"Tahoma","sans-serif"'> <a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Gary Willett<br>
<b>Sent:</b> Tuesday, April 12, 2011 8:35 PM<br>
<b>To:</b> <a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
<b>Subject:</b> [RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter</span><o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt'><span
style='font-size:13.5pt;line-height:115%'>Working on a proposal to add battery
backup and a generator to an existing 10kW grid-tie system using the Fronius IG
Plus 10.0 inverter.<br>
<br>
Does anyone have any experience AC coupling this inverter to a Sunny Island
5048, or a Xantrex 6048? Is the Fronius capable of Frequency Shift control (FSC)
that comes from the battery-connected inverter?<br>
<br>
Any other suggested solutions is appreciated.</span><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt'>Gary Willett, PE<br>
Icarus Solar Services LLC<br>
<br>
</span><o:p></o:p></p>
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