<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.0.4630.0">
<TITLE>Enphase inverters</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/rtf format -->
<P><FONT FACE="Arial">Wrenches, here's a followup question and answer about the new Enphase inverters:</FONT>
</P>
<P><FONT FACE="Arial">----- Original Message -----<BR>
From: "Allan Sindelar" <allan@positiveenergysolar.com><BR>
To: "Scott King" <sking@enphaseenergy.com><BR>
Subject: RE: Enphase Energy - Further Info</FONT>
<BR><FONT FACE="Arial">Scott, </FONT>
<BR><FONT FACE="Arial">Thank you for your clear answers, which I today forwarded to the Wrenches list. </FONT>
<BR><FONT FACE="Arial">One additional area of concern I have, please: Is the Enphase listed as an AC module inverter, or is it listed as just a grid-tie inverter? My understanding of the UL standard is that an AC module inverter must be integrated with the PV array as an assembly – i.e. sold pre-mounted to the PV module – and that this is why no DC disconnect is required for it since there is no field wiring of the DC circuits. </FONT></P>
<P><FONT FACE="Arial">From what I have seen on the Enphase datasheets and manuals, the type of listing it has is not discussed. Since you are selling it as a separate unit from the PV array it would seem that it is just listed as a grid-tie inverter and therefore would require an accessibly DC disconnect for each inverter (ugh). This seems like a major issue if they are actually only listed as a grid-tie inverter. Can you clarify? </FONT></P>
<P><FONT FACE="Arial">Thanks, Allan</FONT>
</P>
<P><FONT FACE="Arial">Hi Allan,<BR>
Regarding NEC 690.6... Though not a traditional "string" inverter, Enphase -at the present time- is not listed as an "A/C Module", though it is closer in-concept. In this regard, it is treated as a regular, grid-tied inverter.<BR>
<BR>
Regarding NEC 690.33... "The connectors shall be of the latching or locking type. Connectors that are readily accessible and that are used in circuits operating at over 30 volts, nominal, maximum system voltage for DC circuits, or 30 volts for AC circuits, shall require a tool for opening." Enphase offers both the MC-3 (non-locking) and MC-4 (locking) connector options on its Micro-inverters. In California, the 2008 rules won’t be mandated until January 2011, and at the time of this writing, the majority of the deployed PV in the marketplace is of the non-locking variety. We have already had several AHJs across different counties pass inspection and approve this method for D/C Disconnects.<BR>
<BR>
And just to close the loop on the last, pending item we had, I wanted to let you know that Enphase has now posted the terms of its "Replacement & Reimbursement" policy on our public website. Details of this policy can be found at:<BR>
<BR>
</FONT><A HREF="http://www.enphaseenergy.com/Support/Support-RMA.php"><U><FONT COLOR="#0000FF" FACE="Arial">http://www.enphaseenergy.com/Support/Support-RMA.php</FONT></U></A><BR>
<BR>
<FONT FACE="Arial">Thanks again for the great questions. Let me know if I can help clarify anything else about our product offering.<BR>
<BR>
Best Regards,<BR>
Scott King<BR>
Enphase Energy,<BR>
Customer Support<BR>
Ph. (877) 797-4743, ext. 7026<BR>
sking@enphaseenergy.com<BR>
</FONT><A HREF="http://www.enphaseenergy.com"><U><FONT COLOR="#0000FF" FACE="Arial">http://www.enphaseenergy.com</FONT></U></A><BR>
<BR>
<BR>
<BR>
</P>
</BODY>
</HTML>