[RE-wrenches] Using the North Facing Roof

[Jason Szumlanski]

Maybe I'm a bit slow, but I don't understand this slide at all. This might
make sense for expected momentary power output at a particular static sun
position (perpendicular to the south panel face) under test conditions, but
it doesn't relate to real world energy output with weather and sun position
throughout each day relative to the panels. Can you explain further what
this slide is intended to show?

Jason


On Tue, Jul 28, 2015 at 11:03 AM, <Jarmo.Venalainen at schneider-electric.com>
wrote:

> 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:*
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> * Email:* *jarmo.venalainen at schneider-electric.com*
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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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