GovindaSamy TamizhMani

article

Evaluation of bifacial module technologies with combined‐accelerated stress testing

Peter Hacke, Akash Kumar, Kent Terwilliger, Paul Ndione, more

Progress in Photovoltaics: Research and Applications > 31 > 12 > 1270 - 1284

In view of the increasing interest and market share of bifacial cells and modules, suitable substrates such as glass and transparent backsheets along with ethylene vinyl acetate (EVA) and polyolefin elastomer (POE) encapsulants were examined in combined‐accelerated stress testing (C‐AST) to evaluate and compare degradation modes. Testing with both monofacial and bifacial cells, we found that glass–glass...

article

A status review of photovoltaic power conversion equipment reliability, safety, and quality assurance protocols

Peter Hacke, Sumanth Lokanath, Paul Williams, Arvind Vasan, more

Renewable and Sustainable Energy Reviews > 2018 > 82 > P1 > 1097-1112

Data indicate that the inverter is the element of the photovoltaic plant that has the highest number of service calls and the greatest operation and maintenance cost burden. This paper describes the projects and relevant background needed in developing design qualification standards that would serve to establish a minimum level of reliability, along with a review of photovoltaic inverter quality and...

article

Further Studies on the Effect of SiNx Refractive Index and Emitter Sheet Resistance on Potential-Induced Degradation

Jaewon Oh, Bill Dauksher, Stuart Bowden, Govindasamy Tamizhmani, more

IEEE Journal of Photovoltaics > 2017 > 7 > 2 > 437 - 443

We present the impacts of silicon nitride (SiN_x) antireflection coating refractive index and emitter sheet resistance on potential-induced degradation of the shunting type (PID-s). Previously, it has been shown that the cell becomes more PID-s-susceptible as the refractive index decreases or the emitter sheet resistance increases. To verify the effect of refractive index on PID-s, we fabricated cells...

article

Accelerated Testing of Module-Level Power Electronics for Long-Term Reliability

Jack Flicker, Govindasamy Tamizhmani, Mathan Kumar Moorthy, Ramanathan Thiagarajan, more

IEEE Journal of Photovoltaics > 2017 > 7 > 1 > 259 - 267

This work has applied a suite of long-term-reliability accelerated tests to a variety of module-level power electronics (MLPE) devices (such as microinverters and optimizers) from five different manufacturers. This dataset is one of the first (only the paper by Parker et al. entitled “Dominant factors affecting reliability of alternating current photovoltaic modules,” in Proc. 42nd IEEE Photovoltaic...

article

Surface Disruption Method With Flexible Glass to Prevent Potential-Induced Degradation of the Shunting Type in PV Modules

Jaewon Oh, GovindaSamy TamizhMani, Stuart Bowden

IEEE Journal of Photovoltaics > 2017 > 7 > 1 > 62 - 67

Potential-induced degradation of the shunting type (PID-s) has recently been recognized by the industry as a critical photovoltaic (PV) module durability issue. Many methods to prevent PID-s have been developed at the cell and module levels in the factory and at the system level in the field. This paper presents a prospective method for eliminating or minimizing the PID-s issue either in the factory...

chapter

Defect and safety inspection of 6 PV technologies from 56,000 modules representing 257,000 modules in 4 climatic regions of the United States

Sai Tatapudi, Cara Libby, Christopher Raupp, Devarajan Srinivasan, more

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 1747 - 1751

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Defect and safety inspections were performed on about 56,000 photovoltaic (PV) modules representing 257,000 modules of multiple technologies (mono-Si, poly-Si, a-Si, CdTe and CIGS) aged between 1.3 and 26 years, and operating in four climatic regions (hot-dry, temperate, cold-dry and hot-humid) of the United States. The number (or percentage) and types of defects and safety failures primarily depend...

chapter

Automation of risk priority number calculation of photovoltaic modules

Mathan Kumar Moorthy, GovindaSamy TamizhMani

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 1730 - 1735

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Statistical risk analysis on the field observed defects/failures in the photovoltaic (PV) power plants is usually carried out using a combination of several manual methods which are often laborious, time consuming and prone to human errors. In order to mitigate these issues, an automated statistical risk analysis based on FMECA (failure mode effect criticality analysis) is necessary. The automated...

chapter

Effect of spatial temperature uniformity on outdoor photovoltaic module performance characterization

Neelesh Umachandran, GovindaSamy TamizhMani

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 2731 - 2737

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Temperature uniformity in a photovoltaic (PV) module is critical to accurately measure module performance parameters and temperature coeificients. In the case of indoor flash solar simulators, a uniform temperature among all the cells within a test module is maintained using a specialized thermal setup or an air conditioned environment. However, maintaining uniform module temperature in all the cells...

chapter

Comparative study of 28 and 18 years field aged Siemens-Arco M55 modules in temperate and hot-dry climates

Matthew Chicca, John Wohlgemuth, GovindaSamy TamizhMani

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 1686 - 1691

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

The primary objective of this research work is two-fold: (i) determine the degradation rates of Siemens-Arco M55 modules exposed over 18 and 28 years in a hot-dry climate of Arizona and a temperate climate of California, and; (ii) identify the potential modes responsible for these degradation losses. The degradation rates were determined based on the I-V data obtained on exposed modules and on the...

chapter

Degradation rate evaluation of multiple PV technologies from 59,000 modules representing 252,000 modules in four climatic regions of the United States

Christopher Raupp, Cara Libby, Sai Tatapudi, Devarajan Srinivasan, more

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 255 - 260

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

With the recent extension of the U.S. federal investment tax credit (ITC), more photovoltaic (PV) power plants are expected to be installed in ever increasing capacities in various climatic regions of the United States over the next few years. While the major industry-leading technology has been mono- and poly-crystalline silicon (c-Si), great strides in the commercial development of other PV technologies...

chapter

A novel technique for performing PID susceptibility screening during the solar cell fabrication process

Jaewon Oh, Som Dahal, Bill Dauksher, Stuart Bowden, more

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 907 - 910

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Various characterization techniques have historically been developed in order to screen potential induced degradation (PID)-susceptible cells, but those techniques require final solar cells. We present a new characterization technique for screening PID-susceptible cells during the cell fabrication process. Illuminated Lock-In Thermography (ILIT) was used to image PID shunting of the cell without metallization...

article

Study of Soiling Loss on Photovoltaic Modules With Artificially Deposited Dust of Different Gravimetric Densities and Compositions Collected From Different Locations in India

Jim J. John, Sonali Warade, Govindasamy Tamizhmani, Anil Kottantharayil

IEEE Journal of Photovoltaics > 2016 > 6 > 1 > 236 - 243

Evaluation of soiling loss on photovoltaic (PV) modules in a geographical location involves collecting data from a fielded PV system of that location. This is usually a time-consuming and expensive undertaking. Hence, we propose collecting dust samples from various location of interest, preferably from the module surface, and use them as dust samples so that the soiling experiments can be conducted...

article

Quantification and Modeling of Spectral and Angular Losses of Naturally Soiled PV Modules

Jim J. John, Vidyashree Rajasekar, Sravanthi Boppana, Shashwata Chattopadhyay, more

IEEE Journal of Photovoltaics > 2015 > 5 > 6 > 1727 - 1734

Spectral and angle of incidence (AOI) losses on naturally soiled crystalline silicon photovoltaic (PV) modules have been investigated in this study. The test modules designated as “moderately soiled (3 g/m² )” and “heavily soiled (74.6 g/m²)” showed short-circuit current (

$I_{{\rm sc}}$

) losses of about 10% and 41%, respectively. The spectral reflectance and quantum efficiency (QE) losses were also...

article

Potential-Induced Degradation (PID): Incomplete Recovery of Shunt Resistance and Quantum Efficiency Losses

Jaewon Oh, Stuart Bowden, GovindaSamy TamizhMani

IEEE Journal of Photovoltaics > 2015 > 5 > 6 > 1540 - 1548

Potential-induced degradation (PID), specifically PID leading to shunts (PID-s), has recently been identified as one of the major field durability issues of photovoltaic (PV) modules. The industry is attempting to address this issue at the module/cell production level by modifying the cell, glass, and/or encapsulant properties, as well as at the system level through the application of reverse potential...

chapter

Working towards the development of a standardized artificial soiling method

Sravanthi Boppana, Vidyashree Rajasekar, GovindaSamy TamizhMani

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 6

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

Solar glass coatings for photovoltaic (PV) modules include antireflection and antisoiling coatings. There are increasing number of claims related to dust resistant, abrasion resistant (during cleaning) and self-cleaning solar glass coatings. Currently, there is no standardized way of verifying the validity of such claims. As a first step towards validating such claims, the industry needs to develop...

chapter

Cleaning frequency optimization for soiled photovoltaic modules

Mohammad Naeem, Govindasamy TamizhMani

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 5

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

This study was conducted to determine the optimum cleaning frequency for cleaning Photovoltaic (PV) modules installed in Mesa (near Phoenix), Arizona, United States. By monitoring the soiling loss of PV modules mounted on a mock rooftop at ASU-PRL during May through June 2014 (highest soiling period for this site), a detailed soiling loss modeling was obtained. During the dry/soiling summer season,...

chapter

Angle of incidence effect on five soiled modules from five different PV technologies

Vidyashree Rajasekar, Sravanthi Boppana, GovindaSamy TamizhMani

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 6

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

Higher the angle of incidence (AOI), lower will be the photovoltaic (PV) module performance. The AOI investigation for cleaned modules of five different technologies with air/glass interface has already been reported by our research group. However, the modules that are installed in the field would invariably develop a soil layer with varying thickness depending on the site condition, rain fall and...

chapter

Performance and reliability evaluation of concentrated photovoltaic (CPV) power plants

Christopher Raupp, Sai Tatapudi, Bulent Bicer, GovindaSamy TamizhMani

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 4

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

Performance and reliability evaluation and analysis of three concentrating photovoltaic (CPV) systems or power plants are presented at the string levels excluding the thermal and module level analyses. These plants are located in Arizona and were commissioned in mid-2012 (about 2 years old). The strings in all three power plants are operating between 79% and 0% of the rated capacity, and the average...

chapter

Selection of best methods to calculate degradation rates of PV modules

Sanjay Shrestha, Govindasamy TamizhMani

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 4

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

Three different PV systems were evaluated to compute degradation rates using four different methods and the methods are: I–V measurement metered raw kWh, performance ratio (PR) and performance index (PI). I–V method, being an ideal and the best method for degradation rate computation, was compared to the results obtained from other three methods. The median degradation rates computed from kWh method...

chapter

Statistical methods to determine dominant degradation modes of fielded PV modules

Neelesh Umachandran, Joseph Kuitche, GovindaSamy TamizhMani

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 6

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

The purpose of this analysis is to identify the most influential degradation modes in the fielded photovoltaic (PV) modules in two different climatic conditions using statistical techniques. This study is based on the measured I–V data and visual inspection data on sampled modules in five different power plants located in Arizona (hot-dry climate) and in New York (cold-dry climate). Statistical tests...

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Search results for: GovindaSamy TamizhMani

Evaluation of bifacial module technologies with combined‐accelerated stress testing

A status review of photovoltaic power conversion equipment reliability, safety, and quality assurance protocols

Further Studies on the Effect of SiNx Refractive Index and Emitter Sheet Resistance on Potential-Induced Degradation

Accelerated Testing of Module-Level Power Electronics for Long-Term Reliability

Surface Disruption Method With Flexible Glass to Prevent Potential-Induced Degradation of the Shunting Type in PV Modules

Defect and safety inspection of 6 PV technologies from 56,000 modules representing 257,000 modules in 4 climatic regions of the United States

Automation of risk priority number calculation of photovoltaic modules

Effect of spatial temperature uniformity on outdoor photovoltaic module performance characterization

Comparative study of 28 and 18 years field aged Siemens-Arco M55 modules in temperate and hot-dry climates

Degradation rate evaluation of multiple PV technologies from 59,000 modules representing 252,000 modules in four climatic regions of the United States

A novel technique for performing PID susceptibility screening during the solar cell fabrication process

Study of Soiling Loss on Photovoltaic Modules With Artificially Deposited Dust of Different Gravimetric Densities and Compositions Collected From Different Locations in India

Quantification and Modeling of Spectral and Angular Losses of Naturally Soiled PV Modules

Potential-Induced Degradation (PID): Incomplete Recovery of Shunt Resistance and Quantum Efficiency Losses

Working towards the development of a standardized artificial soiling method

Cleaning frequency optimization for soiled photovoltaic modules

Angle of incidence effect on five soiled modules from five different PV technologies

Performance and reliability evaluation of concentrated photovoltaic (CPV) power plants

Selection of best methods to calculate degradation rates of PV modules

Statistical methods to determine dominant degradation modes of fielded PV modules

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