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Posted by j on February 16, 2012, 5:59 pm
 
On 2/16/2012 11:55 AM, Curbie wrote:



Thanks.

It appears to me that by the time you buy the frames, tempered solar
glass and sealant that you have spent a $/W or so before you've
purchased the cells.

Do I have that right?

   Cheers,
Jeff



Posted by Curbie on February 16, 2012, 8:07 pm
 
I think on a small scale, you'd be lucky to produce the panels
including cells but excluding a lot fussy labor for same cost as
buying commercial panels, so not unless you doing something special,
like collecting solar for both PV and thermal from the same limited
panel area, if cost is your primary driver, I don't think you'll beat
buying commercial PV panels.

If you are doing both solar PV and thermal, combining the two help the
efficiency for PV in the summer when you probably don't need the heat
collect from the thermal, but the efficiency for thermal when you need
heat in the winter is going to be far less than a dedicated thermal
panel.

How many hours of full sun energy do you get in coldest month?

Curbie







Posted by j on February 16, 2012, 9:15 pm
 On 2/16/2012 3:07 PM, Curbie wrote:

That is what I've come to think too. The cost of the incidentals is too
high.

Here is the NREL insolation calculator:

http://rredc.nrel.gov/solar/old_data/nsrdb/1961-1990/redbook/atlas/

I'm in Atlanta, Ga. Completely overcast and drizzly today. The collector
is at or slightly above inside ambient and has been off all day. But
then it is 59F outside!

My "butler" is in the Solar Cabana reading. That is at 64. On a clear
cold day that can easily get into the 80's and up and temps in direct
sun over 100. When the sun goes down though, the temperature plummets.

Usually the coldest days are the clearest.

What I would like to do is put the solar hot water online and do staple
up underfloor radiant with the stored hot water. That way I could be
nearly all solar heated. Next year, I think...

   Jeff


Posted by Jim Wilkins on February 16, 2012, 11:08 pm
 

My father is from the Atlanta area. One year my parents went down to visit
in the winter. A below-freezing cold spell struck and no one's heat pump
could keep up. The folks came back to Concord NH to warm up.




Posted by j on February 16, 2012, 11:18 pm
 On 2/16/2012 6:08 PM, Jim Wilkins wrote:

A few years back we had a snowstorm predicted. All the schools and most
businesses closed. No storm that day, but they were sure it was just
delayed. So the schools and businesses stayed closed.

Three days of closings, and it never snowed.

We don't do winter weather well. You should see them drive in it, ...
from a distance!

Jeff



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