Fw: Interesting installation [RE-wrenches]

[Bill Brooks]

William,

Your example of their parking shade is not a valid reflection of their
current program. That system was installed with looks as the primary design
criteria. They have been raked about the performance of the system by me and
others. That is one of the reasons they have so many checks and balances
now.

Since it is there money, however, they will continue to do building
integrated (BIPV) projects--many of which will have fairly poor output
because of the compromises that must be made with BIPV projects. They do it
for the aesthetics and the exposure for the technology. It is defended by
the fact that we build all kinds of artistic sculptures that you or I may
find uneconomic, but we do it for artistic reasons.

Bill.


-----Original Message-----
From: William Korthof [mailto:wkorthof at earthlink.net]
Sent: Monday, April 21, 2003 4:16 PM
To: RE-wrenches at topica.com
Subject: RE: Fw: Interesting installation [RE-wrenches]


The City of Los Angeles has developed a very rigorous program
(and process) for PV installations. For a typical residential system,
there are 3 separate inspectors (potentially multiple visits for each).

Must have the right type of AC disconnect, with ability to lock off
your Sunny Boy (in case line workers have nothing better to do).
Each panel needs it's own special ground wire, the MC cables
can't droop on to the roof anywhere. Every installation now needs
a pathfinder (or equivalent) solar/shading analysis. Thou shall use
Shell solar panels (or Powerlight products) or forfeit big rebate $$.
The HVDC disconnect must break the PV at leads at least twice
(no matter whether it's a Siemens, Square D, or other product).

Yet even with all the scrutiny, many LADWP installations aren't
perfect. Example: the extensive PV parking shade canopies at
the HQ building and LA convention center have a really neat
"branches of a tree canopy" appearance. Yet due to their
orientation, the leading upper edge of every panel (N/W side)
severely shades the lower edge of the adjacent panel, resulting
in diminished output until afternoon, year round.

/wk

***snip***

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