[RE-wrenches] How can I calculate ROI when the kWh rate varies through the day?

[Dave Click]

SAM is what you're looking for:
https://sam.nrel.gov/

I didn't have much luck last time I tried to import TOU utility data, 
but you can enter your parameters manually if the auto-import doesn't 
work for you.

Dave

On 2015/4/8 16:15, Mick Abraham wrote:
> Hello, Mechanix~
>
> A client requested a pure grid tie PV quote and of course I wish to 
> help him project ROI return on investment. PV Watts only allows a 
> single value to be keyed for the cents per kilowatt-hour, but my 
> customer is on a TOU "time of use" billing program, so from 1 P.M. to 
> 5 P.M. the value of his generated power is ~50% of the value during 
> all other sunny hours.
>
> Is there a more sophisticated ROI calculation tool that allows $0.xx 
> per kilowatt hour for one time interval then $0.yy in for a different 
> time interval? This particular situation then also needs $0.zz for a 
> third interval to get an accurate projection. The rooftop is skewed to 
> the east so that skews the power delivery to benefit those hours 
> before the value per kilowatt hour drops, so the ideal ROI tool would 
> factor in that non-180 degree azimuth orientation, roof pitch etc.
>
> If I can think of any way to make this question more complicated, I'll 
> post a follow up (!)
>
> Thanks in advance. The Wrench List is da bomb!
>
> Mick Abraham, Proprietor
> www.abrahamsolar.com <http://www.abrahamsolar.com>
>
> Voice: 970-731-4675
>
>
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