Unlocking Exploration: Self-Motivated Agents Thrive on Memory-Driven Curiosity
16 m. joanny ok
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Cell interconnection challenges for
bifacial modules
M. Joanny, B. Soria, A. Bettinelli, P. Lefillastre, B. Novel, H. Robin, R.
Monna, Y. Veschetti, G. Razongles, E. Gerritsen and CEA team
- maryline.joanny@cea.fr
Direction of Technological Research
Solar Technologies Department
Laboratory of PhotoVoltaic Modules
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
Cell interconnection challenges for bifacial modules
Objective :
Content :
To find the best cell interconnection architecture
for bifacial module
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bifi PV workshop 2014.05.26 Chambéry
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
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3 bus
interconnect ribbon
1.5 mm
4
1) Module architecture
• Interconnection schemes evaluated
n-type bifacial cells 156 mm pseudo square (INES PERT technology 20% efficiency)
encapsulant EVA standard / EVA UV clear
glass-glass structure 36 cm x 36 cm x 3 mm
4 bus
interconnect ribbon
1.2 mm
3 bus - ½ cell
interconnect ribbon
1.5 mm
2) Front performance
3) Bifacial performance
4) Conclusion
* interconnection material provided by Meyer Burger (smartwire technology)
smartwire*
wires with PET film
x 36
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• Interconnection schemes evaluated
3 bus
interconnect ribbon
1.5 mm
4 bus
interconnect ribbon
1.2 mm
wires with PET film
x 36
interconnect ribbon
1.5 mm
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
smartwire*3 bus - ½ cell
n-type bifacial cells 156 mm pseudo square (INES PERT technology 20% efficiency)
encapsulant EVA standard / EVA UV clear
glass-glass structure 36 cm x 36 cm x 3 mm
* interconnection material provided by Meyer Burger (smartwire technology)
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bifi PV workshop 2014.05.26 Chambéry
Joanny, Maryline
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
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• STC performance
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
mask
same total transparent area for all architectures
→ Isc (A), FF (%), Pmax (W)
⇒ CTMIsc (%), CTMFF (%), CTMPmax (%)
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• STC performance
EVA standard
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
EVA UV clear
→ 4 bus STC CTM Pmax is 1 % better than 3 bus
→ 3 bus - ½ cell and smartwire show better STC performance than standard 3 bus (respectively 3 %
and 6 %)
≈ 3 % better
≈ 6 % better
≈ 4,5 % better
≈ 5 % better
Isc (A)
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• Front performance
→ CTMFF slopes are comparable for 3 bus and 4 bus interconnection schemes
→ The lowest CTMFF slope is obtained for the smartwire module
→ Smartwire then 3 bus - ½ cell show the best CTMFF especially at high irradiance
≈ 3,5 % better
≈ 5,5 % better
EVA UV clear
EVA standard
2) Front performance
3) Bifacial performance
4) Conclusion
FFmodule
FFcell @ 1000 W/m²
1) Module architecture
≈ 6,5 % better
≈ 4 % better
700 W/m²
1000 W/m²
1200 W/m²
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• Front performance
White
screen
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
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• Front performance
4 modules with encapsulant EVA standard
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
White
screen
1
2
→ Using a white screen enables to reach 1,5 to 2% more on Isc and Pmax performance
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
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• Module bifaciality in Pmax
2) Front performance
3) Bifacial performance
4) Conclusion
95,7 %
86,8 %
87,9 % 88,3 %
Bifaciality
1) Module architecture
Smartwire allows an
optimized design of the
rear side
1
2
→ Bifaciality obtained for the smartwire module is 95,7 %
→ Bifacialities of 86,8 to 88,3 % are obtained with the other interconnection schemes
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• Bifacial indoor characterisation set up
aluminium mirrors
self-monitoring of irradiance with Isc
mesh filters → T ≈ 25% and 50%
reflective mirror
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
mesh filter
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• Bifacial performance
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
y = 0,95 x (R² = 0,9993)
Linear regression
Pmax
Pmax1000 W/m²
- 1
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• Bifacial performance
EVA UV clear
EVA standard
y ≈ 0,95 x
y ≈ 0,84 x
Y ≈ 0,78 x
y ≈ 0,80 x
2) Front performance
3) Bifacial performance
4) Conclusion
Pmax
Pmax1000 W/m²
- 1
→ The gain obtained on bifacial modules can reach 0.95 x albedo (smartwire), 0.84 x albedo (3
bus - ½ cell), 0.80 x albedo (4 bus) and 0.78 x albedo (3 bus)
1) Module architecture
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
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• Summary and conclusion
2) Front performance
3) Bifacial performance
4) Conclusion
1) Module architecture
→ Foreseen follow up : upscale to real size module and characterisation
→ The best performance have been obtained for smartwire and ½ cell schemes
→ The smartwire technology appears very attractive due to both module higher performance
and lower cell price (lower quantities of Ag deposited on cell front (/3) and back (/2) sides)
20. 20
Alternative Energies and Atomic Energy Commission
INES RDI | Savoie Technolac – BP332 – 50 avenue du Lac Léman
F-73377 Le Bourget-du-Lac - FRANCE
T. +33 (0)4 79 79 23 17
Email : maryline.joanny@cea.fr
Public establishment with commercial and industrial character | RCS Paris B 775 685 019
Thanks for your
attention
Technological Research Division
Department of Solar Technologies
Photovoltaïc Modules Division
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Acknowledgements to MeyerBurger for providing the smartwire
materials