technology innovation and risk mitigation of solar...
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Technology Innovation and Risk
Mitigation of Solar AssetsLucie Garreau-iles
Technical Manager, EMEA
DuPont Photovoltaic Solutions
DuPont Photovoltaic Materials Portfolio
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Over 50% of panels installed in the field since 1975 contain DuPont materials
Evolution of the Backsheet Defects
➢ Backsheet defects have increased from 7.5% based on 450MW (2016) to 9.5% based on 1GW of field data (2018).
➢ But serious backsheet defects (cracking & delamination) have increased from 14% of the total backsheet defects to 58%.
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Material Sensitivity in the Field
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PA = Polyamide
PVDF = Polyvinylidene Difluoride
PVF = Polyvinyl Fluoride
PET = Polyethylene Terephthalate
FEVE = Fluoroethylene Vinylether
4+ years in service
All service years56%
45.7%
35%
12.8%
30.3%
10.6%
22.6%
3.4% 3.1% 2.4% 0.05%
PVF
DEFECTS
Accelerated Sequential Dynamic Mechanical Load Test
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G/G
front
G/G
Back
Mechanism:
Dynamic mechanical loading combined with
UV, thermal cycling and humidity freeze lead
to delamination of G/G modules at edges.
G/G structures are not breathable, moisture
ingression from edges and acid from
degraded EVA encapsulant are trapped in
the module.
The sequential test simulates outdoor
delamination of G/G modules.
Why a Clear Backsheet vs Glass?
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Clear based backsheet
• Conventional packaging technology, field
proven
• High transparency, thinner
• Compatible with incumbent production
assembly
• Breathable substrate / EVA vs POE (polyolefin)
• Improved heat dissipation
• Lighter weight by 25-35%
• Framed panels bring mechanical stiffness
(especially with 72 cell designs)
• Lower surface tension vs glass – ease of
cleaning / back
Designing a Durable Clear Backsheet
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Xenon Arc Lamp, boro/boro filter
0.8 W/m2-nm @ 340 nm, 90 °C BPT, 65 °C CHT
Adequate Testing to de-risk Innovation
Field failures Lab test failuresDynamic Mechanical Load test for
Glass/Glass structures
Material Accelerated Sequential testing
for Glass/Backsheet structures8
LCOE Sensitivity
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-25%
-20%
-15%
-10%
-5%
0%
5%
10%
15%
20%
25%
30%
20% 22% +10% +20%20 y
30 y
Efficiency(18%)
Power Output(1800kWh/kWp)
Lifetime(25 years)
• Irradiation
• Bifacial
• Trackers
• O&M
• PERC
• n-type
• HJT,…
• System design
• BoS Components
• BoM/Panels
• O&M
2.3 USD cents/kWh
LCOE
Variation
Tedlar® PVF-based Backsheets in the Field
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