[RE-wrenches] Using the North Facing Roof

[Jarmo.Venalainen at schneider-electric.com]

I did a slide on the effect of North facing modules.  For even a fairly 
aggressive rotation North as shown, the effect is "only" a 50% reduction.

The questions of whether or not to do it, are,

- is the mounting structure simpler, lower cost
- security against wind
- can I put a larger array on the roof  (typically yes, if you make back 
to back pyramid shaped structures)
- overall, what is the cost versus benefit

JARMO
_____________________________________________________________________________________ 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalainen at schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 








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From:
"Peter Parrish" <peter.parrish at calsolareng.com>
To:
"'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>, 
Date:
07/28/2015 12:22 AM
Subject:
[RE-wrenches] Using the North Facing Roof
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>



I recently read a short piece that caught me up short, and I quote:

“The fast dropping cost of solar, while a huge boon to the adoption of 
solar PV, has counter-intuitively altered design parameters. No longer is 
the north-facing roof considered unusable because limited application in 
less-than optimal orientations can still show a positive net benefit. 
Arrays are thus designed now with elements or sub-arrays in these 
locations, increasing overall kW installation while reducing the energy 
production per capacity installed. This might have been anticipated based 
on sheer economic analysis from a users perspective, but so long has solar 
been expensive that these less optimal orientations were never seriously 
considered.”
 
I doubt that the individual who wrote this piece came to these conclusions 
him/herself. Does anyone know of a recent article that argued this 
perspective? Is this an emerging design practice? If so, I’d like to know 
more about it. 
 
-          Peter 
 
Peter T. Parrish, Ph.D.
President, SolarGnosis
1107 Fair Oaks Ave., Suite 351
South Pasadena, CA 91030
(323) 839-6108
petertor at pobox.com
 

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