16 m. joanny ok
TRANSCRIPT
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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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
Direction of Technological Research
Solar Technologies Department
Laboratory of PhotoVoltaic Modules
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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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
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
3 bus
interconnect ribbon
1.5 mm
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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 performance3) Bifacial performance4) Conclusion
* interconnection material provided by Meyer Burger (smartwire technology)
smartwire*
wires with PET film
x 36
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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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 performance3) Bifacial performance4) 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)
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• STC performance
2) Front performance3) Bifacial performance4) Conclusion
1) Module architecture
mask
same total transparent area for all architectures
→ Isc (A), FF (%), Pmax (W)
⇒ CTMIsc (%), CTMFF (%), CTMPmax (%)
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• STC performance
EVA standard
2) Front performance3) Bifacial performance4) 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)
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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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 performance3) Bifacial performance4) Conclusion
FFmodule
FFcell @ 1000 W/m²
1) Module architecture
≈ 6,5 % better
≈ 4 % better
700 W/m²
1000 W/m²
1200 W/m²
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• Front performance
White
screen
2) Front performance3) Bifacial performance4) Conclusion
1) Module architecture
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• Front performance
4 modules with encapsulant EVA standard
2) Front performance3) Bifacial performance4) 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
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• Module bifaciality in Pmax
2) Front performance3) Bifacial performance4) 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 performance3) Bifacial performance4) Conclusion
1) Module architecture
mesh filter
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• Bifacial performance
2) Front performance3) Bifacial performance4) Conclusion
1) Module architecture
Pmax @ 0% albedo
Pmax @ 23% albedo
Pmax @ 47% albedo
Pmax @ 100% albedo
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• Bifacial performance
2) Front performance3) Bifacial performance4) Conclusion
1) Module architecture
y = 0,95 x (R² = 0,9993)
Linear regression
Pmax
Pmax1000 W/m²
- 1
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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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 performance3) Bifacial performance4) 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
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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1) Module architecture
2) Front performance
3) Bifacial performance
4) Conclusion
Imp 154 D - INESFREE DISTRIBUTIONbifi PV workshop 2014.05.26 ChambéryJoanny, Maryline
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• Summary and conclusion
2) Front performance3) Bifacial performance4) 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)
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Alternative Energies and Atomic Energy Commission
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F-73377 Le Bourget-du-Lac - FRANCE
T. +33 (0)4 79 79 23 17
Email : [email protected]
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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