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<DIV>A Los Angeles contractor replied off-list that transformerless
inverters cannot get permitted through LA Department of Building &
Safety's new express permit process that uses boilerplate
drawings. They can get permitted through regular plan check. This would not
be an issue, but LADWP and the LA Department of Building & Safety are very
influential nationally. They have teamed up to spearhead a statewide effort
to standardize system designs to expedite permitting PV systems under
10 kW. Other utilities have their eyes on what LADWP is doing.</DIV>
<DIV>Joel Davidson</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>From:</B>
<A title=wkorthof@gmail.com href="mailto:wkorthof@gmail.com">William
Korthof</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 18, 2012 11:44
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] RE-wrenches
Digest, Vol 5, Issue 113</DIV>
<DIV><BR></DIV><BR>Interesting update.... I've installed dozens of
non-isolated transformerless inverters <BR>with LADWP customers since those
genius inverters first became available from <BR>Power-One's inverter
ancestor, Magnetek. I don't remember ever having a conflict or <BR>technical
issue with an engineer or inspector questioning the suitability of that class
<BR>of inverter, or even looking for the double-insulated solar wire that is
supposed to be <BR>required for the exposed solar wires. <BR><BR>/wk<BR>
<DIV class=gmail_quote><FONT size=2 face=Arial></FONT> </DIV>
<DIV class=gmail_quote>On 4/16/2012 9:05 AM, Joel Davidson wrote:
<BLOCKQUOTE cite=mid:96EAA55766654E9C812C769F3412FD7F@JOEL
type="cite">Wrenches, <BR>Los Angeles Department of Water & Power
(LADWP), the largest and most influential municipal utility in the US is
finally going to allow transformerless inverters for residential PV systems.
Are there any design, installation or reliability issues to consider with
the SMA and other high-frequency transformerless inverters. Can they be
mounted on a hot south or west wall or do the have to be kept cool in the
shade? <BR>Joel Davidson <BR><BR></BLOCKQUOTE></DIV></BLOCKQUOTE></BODY></HTML>