Amitabh Verma ABG-Solar Power Business June 25, 2015 Module related issues in PV Module related issues in PV Module related issues in PV Module related issues in PV plants in India and plants in India and plants in India and plants in India and recommended best practices recommended best practices recommended best practices recommended best practices
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Amitabh Verma
ABG-Solar Power Business
June 25, 2015
Module related issues in PV Module related issues in PV Module related issues in PV Module related issues in PV
plants in India and plants in India and plants in India and plants in India and
recommended best practicesrecommended best practicesrecommended best practicesrecommended best practices
Outline
2
• ABG Solar Portfolio
• Field Failures
• Current Module Selection Process
• Performance Assessment
• Summary
ABG Solar’s Footprint
3
• Year of Start: 2011
• Status: Standalone Business under the Umbrella of ABMCPL
•Total Installed Capacity: 80 MW� 7 Projects in 3 states� 27 MWp in Raj.,2 projects � 15 MWp in Guj.,1 project� 38.5 MWp in Telangana, 4 projects
Negative grounding of inverter restored the output
Performance after Negative
Grounding
6
Snail Trail
7No difference in output in array tester. Lab tests underway.
Hot Spots
8
Rust Like Appearance on Bus Bar
9
Rust on Bus Bar Cont…….
10
Torn
Torn
Rust on Bus Bar Cont…….
11
IR Spectroscopy
Rust on Bus Bar Cont…..
12
EDS Analysis of EVA
Basic Question
13
• What constitutes a good module?
• How reliable and durable will be a module?
There is no silver bullet as of date
There is no durability test standard designed as yet by IEC
Criteria for Module Selection
14
• Cost of ownership
• IEC 61853
• Legacy Data
• Photon test
• Atlas 25+ Test
• Field Test
•IEC 61215 Design Qualification
• Thresher Test
Reliability Durability
CostPerformance
Specification of BoM and Factory Inspection are Essential for Purchase
15
Completeness of Specification
• Giving wattage, tolerance, efficiency of the module, warranty/guarantee, and
certification as per some standards is not sufficient for purchase.
• Bill of materials and their suppliers are equally critical.
• Factory inspection by the purchaser or third party is essential.
• Attention shall be paid to packaging, transportation and handling of modules.
• Review the quality process of the factory.
• Testing by a third party lab in case of doubt or conflict.
• Proven materials and suppliers having long presence in the field are safe bet.
Low Radiation and High
Temperature Characteristics
16
Supplier A
Low Radiation and High
Temperature Characteristics
17
Supplier B
Low Radiation and High
Temperature Characteristics
18
Supplier C
19
OneOneOneOne----way ANOVA: 250 way ANOVA: 250 way ANOVA: 250 way ANOVA: 250 WpWpWpWp Automatic, 250 Automatic, 250 Automatic, 250 Automatic, 250 WpWpWpWp ManualManualManualManual
Source DF SS MS F P
Factor 1 10.083 10.083 18.22 0.000
Error 18 9.960 0.553
Total 19 20.043
Automatic tabbing and stringing gives narrower Automatic tabbing and stringing gives narrower Automatic tabbing and stringing gives narrower Automatic tabbing and stringing gives narrower
distribution of wattage and curve is skewed distribution of wattage and curve is skewed distribution of wattage and curve is skewed distribution of wattage and curve is skewed
towards higher wattagetowards higher wattagetowards higher wattagetowards higher wattage
Importance of Process
20
Summary
• Module selection is critical for developers as well as financial institutions
• As of today there is no silver bullet for module selection
• In the absence of a standard test for life prediction a variety of test methods
are being proposed which go beyond IEC design qualification test
• The current selection practices are quite price centric.
• Given the price pressure because of tariff heading south, performance
and life cycle costs have taken back seat. There is not enough margin left for
extensive testing. In the absence of long term visibility, often time constraints
also override the much needed due diligence.
• There is a need to review the plants which have been built over last 5 years and
bring out a concise report on experience. The responsibility jointly lies with developers
as well as government agencies.
• Test and standardization activity need greater push in light of ambitious targets