: [RE-wrenches] SE or SW
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
Jesse,
Running PVWatts for various tilt angles with an azimuth angle of 135°
(or 225°) for locations in Minneapolis, shows that the optimum tilt
angle for annual energy production is about 35°, that's almost the same
as the optimum tilt with an azimuth of 180°. To maximize December energy
I did play around with numbers on there and came to that conclusion.
Considering I'm only 50 miles from international falls, it's even a clearer
choice then running the numbers in the cites.
Verification is always nice!
Jesse
Sent from my iPhone
On May 15, 2013, at 5:59 PM, Kent Osterberg
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
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
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 b...@daystarsolar.ca wrote:
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
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:
Jesse,
Based only on the info you provided, I'd recommend the SE face. A
low slope is best for maximizing annual gain, which is what a
conventional grid-tie customer would want. But you are in essence
giving them a system that will function as GT now, but as an
Allan,
That is pretty much my thinking. They have 0 interest in stepping foot roof
and the SE give more tilt and easy ground access to clear the array during
winter.
I appreciate the advice.
Jesse
Sent from my iPhone
On May 14, 2013, at 10:15 PM, Allan Sindelar
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