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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hello, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Just now ordering our first modules that
have SMK connectors--anyone know if these will mate with either MC4 or Tyco? Frustrating.
. .<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 color=navy
face="Comic Sans MS"><span style='font-size:10.0pt;font-family:"Comic Sans MS";
color:navy'>Mark Dickson</span></font></st1:PersonName><font size=2
color=navy face="Comic Sans MS"><span style='font-size:10.0pt;font-family:"Comic Sans MS";
color:navy'>,</span></font><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=ArialMT><span style='font-size:
10.0pt;font-family:ArialMT;color:navy'>NABCEP Certified Solar PV Installer
™<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Oasis Montana
Inc.<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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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>Steve Jefferson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 06, 2012 3:58
PM<br>
<b><span style='font-weight:bold'>To:</span></b> glenn.burt@glbcc.com; <st1:PersonName
w:st="on">RE-wrenches</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Grid-Tied, PV by AC or DC</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>When the Grid shuts
off, the SI sends a signal to the SB’s to go into what is called
“Back-up Mode” (this is a parameter change in the SB).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>When there are no
loads and the Batt are full, the SI will ramp the Frequency up, thus forcing
the power from the SB to drop down to close to zero watts, the SB never
disconnects fully.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>As soon as there is
a load, the frequency drops, SB output raises and provides power to the
protected loads.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>The changing of the
parameter in the SB, opens the window of the frequency to allow for this
feature.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>It will work with
other brand inverters but, they would need to be in off-grid mode all the time
(which is out of the standard UL settings). If not in off-grid mode, other
inverters will go into the 5 minute waiting period before trying to reconnect,
then if the Hz is not back within the UL range, it will wait another 5 min.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanks <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>SMA America, LLC<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>Steve Jefferson<o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D;font-style:italic'>Sr.
Technical Service Specialist, Sunny Family</span></font></i><font size=2
color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:#1F497D'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=2
color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:#1F497D'>6020 West Oaks Blvd, Suite 300</span></font></st1:address></st1:Street><font
size=2 color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:#1F497D'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=2
color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:#1F497D'>Rocklin</span></font></st1:City><font size=2 color="#1f497d"
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:#1F497D'>, <st1:State
w:st="on">CA</st1:State> <st1:PostalCode w:st="on">95765</st1:PostalCode></span></font></st1:place><font
size=2 color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:#1F497D'> - 3714<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:country-region w:st="on"><st1:place w:st="on"><font
size=2 color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:#1F497D'>U.S.A.</span></font></st1:place></st1:country-region><font
size=2 color="#1f497d" face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:#1F497D'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>Tel: +1 916
625 0870<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>Fax: +1 916 624-2445<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>Service Line +1 877
697 6283 (Toll Free)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>Email:
steve.jefferson@sma-america.com<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'><a
href="http://www.sma-america.com/">www.SMA-America.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>This email and any attachments
thereto may contain SMA America, LLC confidential, privileged and private
material for the sole use of the intended recipient. Any review, copying, or
distribution of this email (or any attachments thereto) by others is strictly
prohibited. If you are not the intended recipient, please contact the sender
immediately and permanently delete the original and any copies of this email
and any attachments thereto. Thank you.<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>Glenn Burt<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, March 05, 2012 6:18
AM<br>
<b><span style='font-weight:bold'>To:</span></b> '<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Grid-Tied, PV by AC or DC<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>As I understand it,
the SI to SB connection works slightly differently than described below, and
this is borne out by my experience, and a lot of re-reading the SMA literature;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Grid goes away
– SI shifts to a voltage source for the SB<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>SI communicates with
SB and tells it to operate in off-grid mode, widening its voltage window
outside of the UL 1741 usual values<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Batteries full &
no loads, SI shifts the frequency of its micro grid slightly and SB will
eventually drop off line. This is why it also works with other manufacturers
inverters because it does not rely on the SMA proprietary data comms to make
this happen.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>SI continues to
monitor its loads and the grid and during the night it will shift the freq of
its micro grid slightly in the opposite direction to ‘make up’ for
the period it used this to remove the SB, allowing things like clocks that use
the 60Hz of the grid to regain time.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>SI detects return of
grid – communicates with SB and returns it to normal UL 1741 mode<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Glenn Burt<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>Larry Brown<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, March 04, 2012 11:13
AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">RE-wrenches</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Grid-Tied, PV by AC or DC<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Jay,<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>We have installed a number of AC Coupled systems using Sunny Boys and <st1:place
w:st="on"><st1:PlaceName w:st="on">Sunny</st1:PlaceName> <st1:PlaceType w:st="on">Islands</st1:PlaceType></st1:place>.
One important consideration in this approach is to connect the inverters
(Sunny Boys and Sunny Islands) together with a communication cable and
Communication Cards and to upload new software into the Sunny Boys that let
them know when the grid is down to operate in off grid mode. In this way when
the grid is down the Sunny islands can limit the output of the Sunny Boys to
meet the demand of the loads in the protected loads sub panel. Without the
communication between the inverters, if the grid is down and the output of the
Sunny Boys exceeds the demand of the loads in the protected load sub panel,
then the Sunny Island will phase shift and the Sunny Boys will completely
disconnect and then wait five minutes to try and connect again and will
continue to do this until the output of the Sunny Boys does not exceed the
demand of the loads. So it is all or nothing without communication
between the inverters. This would seem to hold true as well for <st1:place
w:st="on"><st1:PlaceName w:st="on">Sunny</st1:PlaceName> <st1:PlaceType w:st="on">Islands</st1:PlaceType></st1:place>
mixed with any other Grid Tied inverters that are not of the SMA family and can
not effectively talk to each other.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Larry<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Larry Brown<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><st1:place w:st="on"><st1:PlaceName w:st="on"><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Sun</span></font></st1:PlaceName>
<st1:PlaceType w:st="on">Mountain</st1:PlaceType></st1:place><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>NABCEP Certified PV Installer<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Mar 4, 2012, at 10:25 AM, jay peltz wrote:<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>HI Darryl,<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Is this a UL listed application for the Radian/Outback?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>And in following this thread about AC coupled:<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Given the higher efficiency of the batteryless inverter and fantastic
MPP, vs the relatively high losses with the 600v xantrex or standard
CC/inverter losses, I would use the AC couple technique.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Jay<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>peltz power<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Mar 3, 2012, at 8:06 AM, Darryl Thayer wrote:<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:black'>A few
years back I made some year long measurements on an outback GVFX and a sunny
boy for net energy to the grid I got only a few percentages not 10% I
think one of the problems is the battery selection, these new batteries from
Outback seem to have very low self discharge so very little energy should be
expended to keep them charged. I am trying to close on a system
where the distance from the solar array to the house is far, so I am planning
to AC couple to a Radian to the grid, and I have been sucessful with AC
coupleing on GVFXs and Outback assures me it will workas well with
theRradian. This install is very sensitive to LOL (loss of load) and has
the generator ready to go, but for the short outages that he has it is a
hassel. (he has worn out one generator all ready, it was a construction
grade genny) <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:black'>I am
hoping if this system is a go to consider a Xantrex 600 volt charge controller,
but it depends upon the customer<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:black'>thanks
for the patence <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:black'>Darryl<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
</div>
<div>
<div>
<div>
<p class=MsoNormal style='background:white'><b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold'>From:</span></font></b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> Drake <<a
href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a>><br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">RE-wrenches</st1:PersonName>
<<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>>
<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, March 2, 2012 9:31
AM<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Grid-Tied, PV by AC or DC</span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal style='background:white'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<div id=yiv497211800>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt;background:white'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>I
think the AC coupled approach would be the best. For the 10KW system, a
pair of <st1:place w:st="on"><st1:PlaceName w:st="on">Sunny</st1:PlaceName> <st1:PlaceType
w:st="on">Islands</st1:PlaceType></st1:place> fed by Sunny Boys would make an
efficient system. Since there is no generator, the system should be
fairly straight forward. <br>
<br>
At 02:06 AM 3/2/2012, you wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:13.5pt;background:white'><font size=4
color=black face=Arial><span style='font-size:13.5pt;font-family:Arial;
color:black'>i think mark was asking more about ac coupling to get away from
the horrible inefficiencies of battery based, grid-tied inverters.<br>
<br>
<br>
<br>
as an experiment, i have been thinking about ac coupling one (or more) of my
arrays on my outback system to gain 10% over having the gvfx do the selling.<br>
<br>
<br>
<br>
stc to ptc usually costs about 20%, then losing another 10% in the inverter is
a real performance hit. i advise customers about phantom loads and
conservation, when actually the battery based inverter is itself the big lump
under the carpet!<br>
<br>
<br>
<br>
todd<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
On Thursday, March 1, 2012 7:07pm, "Maverick Brown [Maverick Solar]"
<<a href="mailto:maverick@mavericksolar.com">maverick@mavericksolar.com</a>>
said:<br>
<br>
My two cents:<br>
"battery-based inverter w/ PV on the DC side via charge controllers"<br>
Simply replace the GT inverter with a Xantrex 600V Charge Controller plus the
48V Grid Interactive Inverter of your choice and added battery bank, etc.<br>
Until the market is saturated with unneeded GT Inverters, you will be ok. ;-)<br>
Try your best to provide enough battery for at least 24 hours of outage at 50%
DOD. You may have add a Sub-Panel or Manual Transfer Switch.<br>
Thanks<br>
Maverick<br>
Maverick Brown<br>
BSEET, NABCEP Certified Solar PV Installer ® # 091209-26<br>
President & CEO<br>
<b><span style='font-weight:bold'>Maverick Solar Enterprises, Inc.<br>
</span></b>Billing: <st1:place w:st="on">PO</st1:place> <st1:address
w:st="on"><st1:Street w:st="on">BOX 1229</st1:Street>, <st1:City w:st="on">Dripping
Springs</st1:City>, <st1:State w:st="on">TX</st1:State> <st1:PostalCode
w:st="on">78620</st1:PostalCode></st1:address><br>
Office: 512-919-4493<br>
Fax: 512-607-6398<br>
Cell: 512-460-9825<br>
Corporate: <a href="http://www.mavericksolarenterprises.com/">http://www.mavericksolarenterprises.com/</a><o:p></o:p></span></font></p>
<p class=MsoNormal style='background:white'><b><font size=4 color=black
face=Arial><span style='font-size:13.5pt;font-family:Arial;color:black;
font-weight:bold'>From:</span></font></b><font size=4 color=black face=Arial><span
style='font-size:13.5pt;font-family:Arial;color:black'> <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" target="_blank">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b><span
style='font-weight:bold'>On Behalf Of </span></b><a
href="mailto:toddcory@finestplanet.com">toddcory@finestplanet.com</a><br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, March 01, 2012
5:46 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">RE-wrenches</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> '<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Grid-Tied, PV by AC or DC<br>
<br>
excellent question mark... and one which has been on my mind as well, being
most of my work is bbgt.<br>
<br>
<br>
<br>
todd<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
On Thursday, March 1, 2012 11:37am, "Mark Frye" <<a
href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>> said:<br>
<br>
Folks,<br>
<br>
I have a residential grid-tied customer in a net metered utility with a
favorable TOU rate.<br>
<br>
They could use about 10 kW of PV to offset 100% of their usage.<br>
<br>
But, they also complain about regular power outages in their neigborhood. They
don't want a generator.<br>
<br>
With reliable AC coupling now available, do we yet know which is the more
advantagous architecture; grid-tied, battery-based inverter w/ PV on the DC
side via charge controllers, or grid-tied, battery-based inverter w/ PV AC
coupled via grid-tied, utility-based inverter?<br>
<br>
Your thoughts? <br>
<br>
Mark Frye <br>
Berkeley Solar Electric Systems <br>
<st1:address w:st="on"><st1:Street w:st="on">303 Redbud Way</st1:Street> <br>
<st1:City w:st="on">Nevada City</st1:City>, <st1:State w:st="on">CA</st1:State>
<st1:PostalCode w:st="on">95959</st1:PostalCode></st1:address> <br>
(530) 401-8024 <br>
<a href="http://www.berkeleysolar.com/" target="_blank">www.berkeleysolar.com</a>
<br>
<br>
<br>
<br>
Sent from Finest Planet WebMail.<br>
</span></font><font color=black><span style='color:black'><br>
<br>
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<p class=MsoNormal style='background:white'><font size=2 color=black
face="Times New Roman"><span style='font-size:10.0pt;color:black'>Drake
Chamberlin <br>
<st1:City w:st="on"><st1:place w:st="on">ATHENS</st1:place></st1:City> ELECTRIC
LLC<br>
OH License 44810 <br>
CO license 3773<br>
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