Does PVWatts really account for hourly weather data such as overcast conditions in the afternoon? I think it just accounts for average solar radiation for a particular location on a monthly basis but I could be wrong. Anyone care to chime in?
-August *August Goers* VP, Engineering o: 415.641.4000 m: 415.559.1525 www.luminalt.com <http://www.luminalt.com/> Reliable solar. Done well. By good people. People love us on *Yelp!*<http://www.yelp.com/biz/luminalt-energy-corporation-san-francisco#query:solar> On Tue, May 14, 2013 at 4:26 PM, Jesse Dahl <[email protected]> wrote: > We do tend towards clear mornings and clouding up in the middle of the > day. Today was a good example of it. I did use PV watts and didnt see a > big difference between the two. > > Thanks Benn > > Jesse > > Sent from my iPhone > > On May 14, 2013, at 6:10 PM, Benn At DayStarSolar <[email protected]> > wrote: > > > 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 <[email protected]> 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 > >> _______________________________________________ > >> List sponsored by Home Power magazine > >> > >> List Address: [email protected] > >> > >> Change email address & settings: > >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > >> > >> List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > >> > >> List rules & etiquette: > >> www.re-wrenches.org/etiquette.htm > >> > >> Check out participant bios: > >> www.members.re-wrenches.org > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: [email protected] > > > > Change email address & settings: > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > > > > Check out participant bios: > > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > >
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