[RE-wrenches] SE or SW

[Dave Palumbo]

PV Watts does not consider snow. So, if you are in an area that snow
coverage is an issue then you have become the decider based on what your
best instincts and your experience tell you. I've got some second story (not
workable for a roof rake unfortunately) low sloped roofs for clients that
can stay snow covered for weeks at a time. But I know that going in and I
take PV watts and de-rate the 5 months that we get significant snow here in
northern Vermont and no one is surprised and disappointed with the poor
winter production.

Dave Palumbo

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Benn At
DayStarSolar
Sent: Tuesday, May 14, 2013 7:10 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] SE or SW

Jesse,
A good decision can be based on, among other site/load specific details, the
site's "micro-climate". 

Do they tend to have clear mornings and cloudier afternoons/evenings? 
...or cloudy/foggy mornings and clearer afternoons/evenings?

Maybe throw the different directions into PVWatts and see what it says,
since it is based on weather history (isn't it?)

Good luck. 
benn
Sent from a 'smart' phone, with touch screen keys. Please excuse shortcuts
and typos. 

On 2013-05-14, at 4:34 PM, Jesse Dahl <dahlsolar at gmail.com> wrote:

> Hello,
> 
> I was asked to look at a site today for a homeowner looking for a grid-tie
with battery-back up. They are Doomsday Preppers for lack of a better term
and want certain loads if and when the grid goes down for good. Aside from
parts selection, they have two roof lines, one facing SE one facing SW. the
SW is very low slope and is only accessible with a ladder and climbing on
the roof, the other is SE, much steeper slope and accessible from the ground
or deck.  I mention the access because of snow removal. We had lots of snow
last year and I spent lots of time on my roof removing 8" snow falls.  Both
have good solar access.  
> 
> I'm inclined to chose the SE roof line, but I am interested in arguments
for the SW. 
> 
> Thanks!
> 
> Jesse 
> 
> Sent from my iPhone
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