<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 9.00.8112.16484">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT size=2 face=Arial>Just an FYI for anyone wanting to use Tigo
optimizers with SMA inverters incorporating AFCI -</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>According to SMA the Tigo optimizers will not
operate with the SMA inverters. They didn't go into detail. They just said the
AFCI feature of the Sunny Boy is not compatible with Tigo. After further
discussion they acknowledged that disabling the AFCI feature in the Sunny Boy
would allow compatibility with the Tigo optimizer. Awesome.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>After talking this over with Tigo they came to the
same conclusion but neither company seemed too happy or confident in the
marriage. Awesome.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Eric Stikes<BR>SunHarvest</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B><PRE>Wrenches,
Here's an update on this configuration (20kW Enphase, AC coupled to
Sunny Islands) you should know about:
Enphase will not support and warranty the use of their micro inverters
in an AC-coupled installation with battery-based inverters. Enphase
approved this verbally with us in design, but balked when we asked
them to back it up in writing. Their issue/point is that AC-coupling
violates the UL1741 listing.
Thus, we're revising the design to use Sunny Boy string inverters. Our
customer would still like the module-level monitoring and optimization
offered by the micro-inverters (there is some shading issue), so we're
considering using string optimizers. We have not used string-
optimization, yet. It looks like the leading options are Solar Magic
and Tigo.
Any preferences, cautions, or advice with choosing and using
optimizers would be appreciated.
Thanks,
-Kelly
Kelly Keilwitz, P.E.
Principal
Whidbey Sun & Wind
Renewable Energy Systems
NABCEP Certified PV Installer
WA Electrical Administrator
987 Wanamaker Rd.
Coupeville, WA 98239
<A href="">kelly at whidbeysunwind.com</A>
PH & FAX: 360.678.7131
</PRE></B></DIV></BLOCKQUOTE></BODY></HTML>