16.09.2019 André Richter - nPV workshopnpv-workshop.com/fileadmin/layout/images/bifiPV/... · ©...

BIFACIAL ENERGY YIELD AND TECHNOLOGICAL ASPSECTS

16.09.2019André Richter

© Meyer Burger

MEASUREMENT SITES

High accuracy measurements:• UAE, Abu Dhabi, 24% POAA, since 01/17: hot

desert (BWh), fixed tilt (8 modules)

• US, California 14% POAA, since 10/16: dry summer tropical (Csa),1-axis tracking (8 modules)

• US, Arizona, 14% POAA, since 10/16: cool steppe (BSk/BWh), fixed tilt (3 modules)

• US, Arizona, 14% POAA, since 10/16: cool steppe (BSk/BWh), 2-axis tracking (3 modules)

• China, Yinchuan, 16% POAA, since 07/17, humid subtropical (Cfa) continental, fixed tilt (8 modules.

Sites covering most important climates for PV systems. Modules at MB owned sites are initially measured by an independent accredited laboratory (SUPSI, CH).

Bifacial workshop 16.09.2019 - André Richter

Sun

bel

t

37°

DNI map

solargis.info

Existing site Meyer Burger site

* POAA one year average figures

© Meyer Burger

SUMMARY OF ENERGY YIELD WORLDWIDE

Meyer Burger leads the development of high performing PV technologies. Heterojunction and SmartwireTM Connection Technology (HJT SWCTTM) is a combination of technologies to increase the overall performance and reliability of PV systems.

In all evaluated locations, HJT SWCTTM

has a superior energy yield as compared to market relevant technologies (BSF, PERC, PERT).

Rule of Thumb: Energy yield gain of HJT SWCTTM is always higher than local ground reflection (POAA).


Relative energy yield gain to BSF in 4 different climates

(rear side partly shaded)

BSF: back surface field solar cellPOAA: Plane of array albedoAverage values, PERT figures partly interpolated

0%

10%

20%

30%

40%UAE

Yinchuan

Arizona

California

HJT SWCT

PERT

PERC

POAA

© Meyer Burger

MOUNTING, TRACKING AND POAA

Different mounting and tracking of PV modules:

Left to right – upper line:• Fixed tilt slanted• Fixed-tilt: horizontal• Fixed-tilt: vertical

Left to right - lower line:• 1-axis tracking• 2-axis tracking• Power distribution over the day

for vertical and slanted fixed tilt

Measurement of albedo and plane of array albedo (POAA) is shown.Only in fixed-tilt horizontal albedo and POAA have same values.In tacking mode, POAA sensors moving with the module.

Alb

edo

PO

AA

POAA

1-axis tracking 2-axis trackingA

lbed

o

«south» showing slanted fixed-tilt

Alb

edo

Sou

rce:

NP

Xsol

ar


© Meyer BurgerBifacial workshop 16.09.2019 - André Richter

Energy Yield - UAE

© Meyer Burger

© Meyer Burger© Meyer Burger

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

08:0

008

:16

08:3

208

:48

09:0

409

:20

09:3

609

:52

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810

:24

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010

:56

11:1

211

:28

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412

:00

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615

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815

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:16

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:48

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417

:20

17:3

617

:52

kW/k

Wp

SWCT HJT

PERT 120

PERT 60

PERT 60

PERC

BSF


Relative toStandard Module

(clear sky day)

BSF-Reference

1 kW/kWp

Meyer Burger Outdoor Test Stand UAEdaytime

Laboratory measurements by

Performance in desert climateSuperior HJT SWCT Technology

Connection

TC

Bifaciality

Age (04/19)0

𝑘𝑊ℎ𝑘𝑊𝑝

𝑘𝑊ℎ_𝐵𝑆𝐹𝑘𝑊𝑝_𝐵𝑆𝐹

Mono-facial

bifacial

UAE 14.03.2019

BSF-Reference

Placement of modules with spacing and no rear shading

1 kW / kWp

100%

110%

120%

130%

140%

150%

160%

5BB multiwire 5BB 5BB SWCT

60 full cell 60 full cell 60 full cell 120 half-cell 60 full cell

-0.38 -0.356 -0.365 -0.346 -0.256

0 0.699 0.739 0.765 0.904

1 year 2 years 2 months 2 months MB HJT SWCT

© Meyer Burger

0.00

0.20

0.40

0.60

0.80

1.00

1.20

07:0

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-

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0.80

1.00

1.20

CLEAR SKY TO OVERCAST DAYS:YIELD GAIN BETWEEN 25% AND 30%

Relative specific energy yield:

Overcast days:Bifacial has the highest relative gain

Clear sky days: highest contribution to energy yield, front side power has highest contribution


Typical overcast day Clear sky day

Relative Gain to BSF per dayPERC

monofacialPERT bifacial

HJT SWCTTMbifacial

overcast 4% 19% 30%clear sky 4% 16% 25%

Placement of modules with spacing and no rear shading.

HJT SWCTPERTPERCBSF

Meyer Burger Outdoor Test Stand UAE

0

1 kW / kWp


HOT CLIMATESTECHNOLOGY DIFFERENCE


When comparing monofacial BSF to bifacial HJT module performance, the bifacial HJT module suffers less from extreme conditions.Simulation of monofacial systems have a very good alignment with the measurement, bifacial system are better than expected:

Bifacial module have additional benefits, the drop of power is less compared to monofacial modules.

0

0.1

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07:00

07:23

07:46

08:09

08:32

08:55

09:18

09:41

10:04

10:27

10:50

11:13

11:36

11:59

12:22

12:45

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14:17

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15:03

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15:49

16:12

16:35

16:58

17:21

17:44

18:07

18:30

18:53

T_modulT_ambGHIPOA_frontPOA_rear

°C kW/m2A B

Calculated difference A to B measured

TC_A/B POA_A/B Total P_A/B

monofacial ‐6.4% 4.0% ‐2.3% ‐2.4%

HJT ‐4.9% 4.0% ‐0.9% 1.8%

Module temperature

Irradiation POA

UAE 22.08.2018


REAL POWER OF A SOLAR MODULE


Watt peak is only a Lab measured figure, reality is different!

Module operating conditions differs with bifacial modules much more than monofacial modules.

Simulation with correct input of the local conditions and a correct model of the module is mandatory.

Real operating values, example

USA, POAA 14% Pmpp Impp Pmpp Impp06.05.2017 09:58 135% 130% 134% 129%06.05.2017 10:05 132% 128% 131% 127%06.05.2017 12:24 139% 136% 140% 136%

Modul 1 Modul 2

Module 1 and 2: HJT SWCT bifacialPmpp: relative to Pmpp_STC

Unshaded single modules


MODULES ARE DIFFERENT


Power of a bifacial module can exceed 100%.

Energy yield reacts very sensitive to bifacial coefficient, if the albedo is at least >10%.

Power of the bifacial modules at same location and time can vary, in this example 30%!

Only very high bifacial coefficients help to get profit out of the local conditions.

Relative power to Wp:Measured power corrected to value w/o TC influence, then relative to monofacial Al-BSF value.This value is important for any scaling of system.

Total power /m2:Corrected by power density of the module

Technologie Al‐BSF PERC+ PERT PERT HJTbifi 0% 70% 74% 77% 90%rel power to Wp 100% 117% 143% 144% 153%total power/m2 100% 138% 187% 189% 206%

UAE, POAA ca. 24%, unshaded, single modules

Power of different technologies at same location:


HJT IBC SWCT BIFACIAL MODULE

HJT SWCT energy yield – version April 2019 - André Richter

SWCT on busbarless bifi cell (PERC, PERT, HJT)

Silver consumption today <100mg/cell (mass production)

© Meyer Burger

EXAMPLE TO DRIVE THE EFFICIENCY:HJT IBC

Highest IBC cell efficiency 90 cm²

24.8%

Highest IBC cell efficiency 6”

22.4%

Jsc

41.3mA/cm²

Bifaciality

77%

Voc

737mV

FF

81.5%


Meyer Burger IBC-HJT is developed to be SWCT compatible

© Meyer Burger

MEYER BURGER PROJECTS WITH EUROPEAN HETEROJUNCTION MANUFACTURERS 3SUN ANDECOSOLIFER


Ecosolifer Csorna, Hungary 3SUN/ENEL, Catania, Italy


MERCITHANK YOU

André RichterMeyer [email protected]+41 79 799 03 99


© Meyer Burger

DISCLAIMER

Information in this presentation may contain “forward-looking statements”, such as guidance, expectations, plans,intentions or strategies regarding the future. These forward-looking statements are subject to risks and uncertainties.The reader is cautioned that actual future results maydiffer from those expressed in or implied by thestatements, which constitute projections of possibledevelopments. All forward-looking statements included inthis presentation are based on data available to MeyerBurger Technology Ltd as of the date that this presentationis released. The company does not undertake any obligationto update any forward-looking statements contained in thispresentation as a result of new information, future events orotherwise.

This presentation is not being issued in the UnitedStates of America and should not be distributed toU.S. persons or publications with a general circulationin the United States. This presentation does notconstitute an offer or invitation to subscribe for,exchange or purchase any securities. In addition, thesecurities of Meyer Burger Technology Ltd have notbeen and will not be registered under the United StatesSecurities Act of 1933, as amended (the "Securities Act"),or any state securities laws and may not be offered, sold ordelivered within the United States or to U.S. persons absentregistration under an applicable exemption from theregistration requirements of the Securities Act or any statesecurities laws.

The information contained in this presentation does notconstitute an offer of securities to the public in the UnitedKingdom within the meaning of the Public Offers ofSecurities Regulations 1995. No prospectus offeringsecurities to the public will be published in the UnitedKingdom. Persons receiving this presentation in the UnitedKingdom should not rely on it or act on it in any way.

In addition, the presentation is not for release,distribution or publication in or into Australia, Canadaor Japan or any other jurisdiction where to do so wouldconstitute a violation of the relevant laws or regulations ofsuch jurisdiction, and persons into whose possession thisdocument comes should inform themselves about, andobserve, any such restrictions.

Trademarks:

SWCTTM Trademark of Meyer Burger Technology Ltd.


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