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
To: [email protected]
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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