02 stein intro_4th-pv_modeling_workshop_2015-10-22_sand2015-8571_c

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Photos placed in horizontal position
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Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia
Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of
Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.
Welcome and
Introduction to the
Workshop
Joshua Stein, PhD.
Distinguished Member of Technical Staff
Sandia National Laboratories, New
Mexico (USA)
4th PV Performance Modeling
and Monitoring Workshop
TÜV Rheinland, Cologne,
Germany October 22-23, 2015
SAND2015-8571 C

Background
1. 2010 Albuquerque, NM
2. 2013 Santa Clara, CA
3. 2014 Santa Clara, CA
4. 2015 Cologne, Germany
5. 2016 (May) Santa Clara, CA
6. 2016 (Fall) Europe???????
 Welcome to the 4th PVPMC Workshop!
 Aim is to bring together international experts on PV performance modeling
and monitoring to discuss new trends and present research results to the
community.
 Focus on technical issues. Information transfer between researchers and industry
 Support discussion, networking, and partnerships
 Identify gaps and opportunities for improving models (and technology)
Previous and Future Workshops
International Scope
Speakers from 12
countries and 4 continents!

PV Performance Modeling and
Monitoring Landscape
PV performance is modeled by
following the flow of energy from
the sun to the meter.
 Each step in the journey is
represented with a model.
 Comparison of monitoring
data to model predictions
helps to detect failures and
degradation
 The PVPMC aims to document
and improve these models so
that best practices are
available and used by the
solar PV industry.
3
Stein, J. S. and B. H. King (2013). Modeling for PV plant
optimization. Photovoltaics International, Solar Media Ltd. 19th: 101-109.

2010 and 2015 Blind Modeling Studies
2010 Blind Study Facts
 20 participants given measured weather
and irradiance and 3 PV system designs
 Asked to predict annual energy from
systems
 Results compared with measured annual
energy
4
15%
difference
Measured energy
Lesson Learned: Greater consistency and transparency in modeling is still needed.
2015 Blind Study Facts
 12 participants given 1 PV system design
and location.
 Asked to predict annual energy from
system
 Participants had to find their own weather
data.
13%
difference
Andrews and Yates, SolarPro Magazine Sept/Oct 2015Cameron, C., J. Stein and C. Tasca (2011). PV Performance
Modeling Workshop Summary Report. Albuquerque, NM,
Sandia National Laboratories.

Topics for this workshop
1. Solar Resource Data
 One of the largest source of
uncertainties
 Need for low-cost, accurate data
everywhere
2. Spectral Corrections
 Recognized as important but not
standardized in existing software
 PV cell technology specific
 Need for new, universal methods
and data
3. Soiling
 Major source of energy loss
 Lack of standard methods to
measure and predict.
4. Bifacial PV
 Disruptive technology?
 Quantify advantages and
challenges.
5. Modeling Applications
 Updates from model developers
6. Monitoring and Validation
 Best practices for monitoring.
 What data is needed for model
validation?
 Recent results from validation
studies.
5

Protocols
 Speakers
 Time limits will be
enforced!
 Ensure presentations are
uploaded well before
your scheduled session.
 We would like to be able
to post/share
presentation materials
after the workshop. If
there are restrictions,
please notify organizers.
 Audience
 Silence cell phones
 Return from breaks on
time
 Ask questions
 Participate in discussion
sessions
 Meet colleagues and
network during breaks
6

Workshop Report
 We will be preparing a workshop report as part of the IEA PVPS task
13 Activity 2.4 “PV Performance Modeling Collaborative”
 It will include:
 Overview of the PV performance modeling process
 Summaries of workshop presentations (Orals and Posters)
 It will be published by the IEA PVPS and be available online in late 2016 or
early 2017.
 I will be reaching out to presenters after the workshop to review
summaries that I will prepare.
 This is a collaborative effort and any other contributions to this
report will be considered and are welcome.
 Please contact me (Joshua Stein) if you would like to contribute.
7

Thank You and Enjoy the
Workshop!
Joshua S. Stein
jsstein@sandia.gov

02 stein intro_4th-pv_modeling_workshop_2015-10-22_sand2015-8571_c

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