<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=us-ascii" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.18828"></HEAD>
<BODY>
<DIV dir=ltr align=left><SPAN class=859295316-20102009><FONT color=#0000ff
size=2 face=Arial>Is there an SMA rep on this forum that can give us more detail
on the SunnyIsland/SunnyBoy AC coupled control loop?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=859295316-20102009><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=859295316-20102009><FONT color=#0000ff
size=2 face=Arial>I thought that the frequency is altered by the
SunnyIsland to trip a fault in the SunnyBoy, but the SunnyBoy is reporgrammed to
override the 5 minute reset so that you had basic on/off control. If
so, is this dymanic enought to provide PWM of the output of the SunnyBoy? Is the
mechanism something other than above?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=859295316-20102009></SPAN><SPAN
class=859295316-20102009></SPAN> <BR><SPAN lang=en-us><FONT size=2
face=Arial>Mark Frye</FONT></SPAN> <BR><SPAN lang=en-us><FONT size=2
face=Arial>Berkeley Solar Electric Systems</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>303 Redbud Way</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>Nevada City, CA 95959</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2 face=Arial>(530) 401-8024</FONT></SPAN>
<BR><SPAN lang=en-us></SPAN><A href="http://www.berkeleysolar.com/"><SPAN
lang=en-us><U><FONT color=#0000ff size=2
face=Arial>www.berkeleysolar.com</FONT></U></SPAN></A><SPAN lang=en-us><FONT
size=2 face=Arial> </FONT></SPAN> </DIV>
<DIV> </DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Jeff
Yago<BR><B>Sent:</B> Tuesday, October 20, 2009 9:52 AM<BR><B>To:</B>
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] AC Coupled
Re-visited<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV style="FONT-FAMILY: Arial, sans-serif; FONT-SIZE: 10pt">
<DIV>it is my understanding that the Sunny Island coupled with Sunny Boys is
able to taper charge in an AC coupled system as the 2 inverters are able to
communicate with each other and the Sunny Island alters the frequency input of
the Sunny Boys and lowers the total output of the Sunny Boys to match the needs
of the battery bank</DIV>
<DIV> </DIV>
<DIV>Kirpal Khalsa</DIV>
<DIV>-------------------------------------------------------------------------------------------------------------------------------------------------</DIV>
<DIV>Yes, if we use a Sunny Island AC coupled with a SunnyBoy we would not
have the battery charging problem, but remember, the SunnyBoy is 240 VAC
and the Sunny Island is 120VAC which I also find is just has expensive to match
up by having to install an external step-down transformer so I still feel
inverter manufacturers are missing an opportunity to provide a needed product
feature that nobody is providing. .</DIV>
<DIV> </DIV>
<DIV>Jeff Yago</DIV>
<DIV>DTI Solar</DIV><BR> <BR>
<HR>
Netscape. Just the Net You Need.</DIV></BODY></HTML>