[RE-wrenches] orientation data

[Mendocino Solar Service]

I think what's needed is a way to analyze the financial output related  
to orientation, not just kwh. Unlike with off-grid systems, grid-tied  
is all about financial results. For a customer on TOU and net  
metering, the time value of the kwh produced is quite important. A  
west facing array will have peak performance in the afternoon when the  
system can sell at the peak rate; even though it may produce fewer kwh  
overall, the value of them is much higher. The CSI's EPBB calculator,  
flawed as it may be, seems to take this into account when calculating  
the design factor on which the rebate is based. Anyone using a program  
that can take time and pricing into account too?

Bruce Erickson
Mendocino Solar Service
707-937-1701
707-937-1741 fax
PO Box 1252
Mendocino, CA 95460



"Serving the Solar System"





On Oct 6, 2009, at 10:53 AM, Ryan Mayfield wrote:

> Nik,
>
> Check out this tool on Solmetric’s website: http://www.solmetric.com/annualinsolation-us.html
>
> You can input your tilt and azimuth and it calculates the percentage  
> loss from the site’s ideal orientation.
>
> Ryan
>
>
>
> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches- 
> bounces at lists.re-wrenches.org] On Behalf Of Nicholas Ponzio,  
> Building Energy
> Sent: Tuesday, October 06, 2009 10:38 AM
> To: RE-wrenches
> Subject: [RE-wrenches] orientation data
>
> Hey Folks,
>
> Anybody have real data to compare productions for south-facing vs,  
> west-facing PV array? PVWatts is only showing about a 7% derating  
> for facing west.
>
> Thanks,
> Nik
>
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