Statistical Analysis

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Generate P90 "TMY" Files from Longterm Timeseries Data


Does SAM have the ability to generate TMY files to a set confidence interval? I suppose these wouldn't be typical (P50) anymore, but the point is to represent with a single 8760 hourly file the solar + weather resource to a particular level. It would have all of the same compromises and utility as a standard TMY file.

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Differences between SAM Sandia Performance Model and PVLIB

I am running a simulation of solar generation for every zip code in the U.S. using SAM and its LK scripting interface. I am also performing the same simulation with Sandia's PVLIB ( model. It is my understanding that SAM's Sandia PV Arary Performance Model should yield the same results as PVLIB if the weather inputs are the same. However, I have tested this using TMY3 weather files, and the AC generation output is different, even with the exact same parameter settings.

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Offshore BOS variables for statistical analysis

Hello, I have some question regarding offshore balance of system variables for statistical analysis as listed below.

1. Are offshore BOS variables not available for input to parametric/stochastic analysis?

2. most of offshore BOS variables shows non-relevance to tornado chart output such as levelized costs and total installed costs even with extreme change (up to 100%) of input variables, is this already known problem and any way to fix it?


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analysis of solar power plant

I have done the simulation of plant taking "mundargi" region as a reference. for the average GHI of 5.77 kwh/square m/day , yearly production which i got from SAM software is 1778,619 kwh. But when i took another region " vijayapur" with average irradiance of 5.83 kWh/ square.m/day, come up with result of 1630,319 kWh. Hence in general for more value of irradiance, should get more output energy value. where as this a different and opposite case. please help me to get solution. Thank you

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Using the SSC with R

Is there any possibility, or any current plans to add an R language interface to SSC? Thank you!

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Error message in stochastic mode

Dear all,

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I am looking to find the expected P50 net annual energy production for each year of a 25 year plan. SAM P50/P90 simulation only provides the net annual production for one year. I would like to know if anyone knows how I can obtain this data.

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abnormal weather condition


How can I simulate system for 25 years that in one year weather condition is severe and significantly different from other years?


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Monthly Weather file format

Hi there,

How can I create a simple weather file which includes only monthly insolation data excluding any hourly or sub-hourly records?

I have data in the format:

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Stochastic Analysis - Input Values


When setting up variables for a stochastic analysis I noticed that an input variable for a State-sponsored Production Based Incentive (PBI) expressed as $/kWh is not available.

I want to demonstrate a high correlation between total installed costs and varied cash incentive levels and their impact on the resulting Net Present Value and simple Payback.

I've already used these same variables in a parametric analysis and wanted to compare results with a stochastic analysis.

Please advise.

Mike -

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