[RE-wrenches] Transformerless inverters

Bill Brooks billbrooks7 at yahoo.com
Fri Apr 20 19:02:35 PDT 2012


Joel,

 

It ain't over until it's over. The statewide effort will not limit
transformerless inverters if I have anything to do with it. This is
something these guys got on their brain, and they won't let it go-YET. Once
they understand better that these inverters are safer, we will get them to
back down.

 

Bill.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Joel
Davidson
Sent: Thursday, April 19, 2012 6:47 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Transformerless inverters

 

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.

Joel Davidson

----- Original Message ----- 

From: William Korthof <mailto:wkorthof at gmail.com>  

To: re-wrenches at lists.re-wrenches.org 

Sent: Wednesday, April 18, 2012 11:44 PM

Subject: Re: [RE-wrenches] RE-wrenches Digest, Vol 5, Issue 113

 


Interesting update.... I've installed dozens of non-isolated transformerless
inverters 
with LADWP customers since those genius inverters first became available
from 
Power-One's inverter ancestor, Magnetek. I don't remember ever having a
conflict or 
technical issue with an engineer or inspector questioning the suitability of
that class 
of inverter, or even looking for the double-insulated solar wire that is
supposed to be 
required for the exposed solar wires. 

/wk

 

On 4/16/2012 9:05 AM, Joel Davidson wrote: 

Wrenches, 
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? 
Joel Davidson 

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