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From Robin<br>
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<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It
has been pointed out that the Tigo modules can and do blow up some
charge controllers and inverters. When a charge controller or
inverter has fairly fast tracking, the two units fight each other.
We have found Classics using the fast tracking mode will blow up
with Tigo’s in the system. We also found that putting the Classic
in the slower tracking mode, Legacy, solves the issue. We are
aware that at least one major inverter model must defeat the
tracking in order not to blow up. We have not yet tested our arc
fault detectors with Tigo modules, but plan on doing this in the
near future. It might be possible that the Tigo modules present a
signature that looks like an arc. That must be what is happening
with the SMA inverter. <o:p></o:p></span>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Robin</span></p>
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<div class="moz-cite-prefix">On 6/5/2013 3:33 PM, SunHarvest wrote:<br>
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<div><font size="2" face="Arial">Just an FYI for anyone wanting to
use Tigo optimizers with SMA inverters incorporating AFCI -</font></div>
<div> </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> </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> </div>
<div><font size="2" face="Arial">Eric Stikes<br>
SunHarvest</font></div>
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<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 moz-do-not-send="true" href="">kelly at whidbeysunwind.com</a>
PH & FAX: 360.678.7131
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