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Posted by stevey on May 7, 2009, 10:44 am
 

You have done all the right things, and your contractor did an
exceptional job.
I did a rough check assuming you had 200W modules.  Our performance
predictor at www.pvperformance.com show 2KW under full Sun without
effects of shade, nor dust layer, etc.   Do you have Sunpower modules?
Please try out our PV performance predictor, and let me know what you
think.

-Steve   aka PVSleuth

Posted by Phil Ross on May 7, 2009, 8:35 pm
 

You have done all the right things, and your contractor did an
exceptional job.
I did a rough check assuming you had 200W modules.  Our performance
predictor at www.pvperformance.com show 2KW under full Sun without
effects of shade, nor dust layer, etc.   Do you have Sunpower modules?
Please try out our PV performance predictor, and let me know what you
think.

-Steve   aka PVSleuth

Your assumption was correct. I have 14 200 watt Sharp ND-200U1 panels tied
to a Fronius IG 3000 inverter. Installation was by Akeena Solar.
http://akeena.net/cm/Home.html  My panels face almost directly south and have
no shade from dawn to dusk, and I keep them pretty clean. I believe that the
roof pitch is 18-21 deg.

Their CEC-AC rating estimate was 2.316 kW, which was almost dead on target.
Plus I exceeded their estimate of 4069 annual kWh with an actual 4771 kWh
over 349 days (August first year true-up). I'm currently at 3379 kWh for the
year since August 6 2008, and we are just hitting the big solar months.

Phil



Posted by Eeyore on May 10, 2009, 3:57 pm
 

Phil Ross wrote:


Which is exactly how I'd start. Go for energy savings first.



Solar hot water has a better rate of return than PV solar. I'd have done that as
the next step. Did you measure what fraction of the 12.5 kWh / day was water
heating ?



I don't disagree.

BTW San Jose has an annual insolation figure of 5.51 kW / m2 / day and is quite
stable over the year ( high is 7.23 and low is 4.63 ).
http://www.apricus.com/html/insolation_levels_sth_am.htm
Where I live ( just N of London ) it's about 2.6 avg and very low in the winter
when you need it most.
http://re.jrc.ec.europa.eu/pvgis/countries/europe/g13y_uk_ie.png
http://www.apricus.com/html/insolation_levels_europe.htm
High of  4.74 kWh / m2 / day - about the same as your min - and low of 0.52. In
other words totally unsuitable here.

Graham


Posted by Phil Ross on May 10, 2009, 5:47 pm
 

None. I currently use natural gas for hot water.



Posted by Eeyore on May 7, 2009, 1:34 pm
 

Bob wrote:


Typical AGWist repsonse. Insulting, intemperate and failing to address the issue
or provide a reasoned case.

Do you know what 'insolation' means ? You're lucky to have lots where you ot
Kevin
Shumway are. In Northern Europe it's a non-starter.

Graham


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