Suntech Power - buyers-world.nl€¦ · How do we choose ideal glass for customers? • The...

All Rights Reserved © Suntech

Choosing the Right Raw Material

Suntech Power


Suntech knows how to choose the right material

In the era of cost down, competitors are rushing to choose cheap

raw material but using IEC standard coverage as justification.

Suntech insists on following criteria for new

material introduction1. Product final quality can not be sacrificed for cost reduction reason

2. Customer oriented concept is implemented from product design phase

3. Proper quality check system must be established before material can be used

in production line (SQE & IQC )

4. All new material has to pass much stringent internal test standard

5. Extended double IEC test has to be passed for key components like

backsheet, EVA, glass, J-box

6. Extended UV test is conducted via test to fail concept


Suntech cooperates with industry leaders


Suntech impacts PV industry by establishing important international industry standards

• Suntech is the 1st Chinese company to lead the publishing of international

PV-standards. [SEMI Technical requirements of ARC glass for crystalline silicon

PV module]

• Suntech proposed the 1st IEC international standards for commercial solar

cells. [The initial light-induced degradation detection methods of crystalline silicon

cell and PV module]

• Suntech is the 1st PV company to lead the compilation of constructional

industrial standards. [Operation and maintenance norms for BIPV systems]

• Suntech led the drafting of the 1st product standard in global PV industry.

[General specification of terrestrial crystalline silicone PV cells]


Ideal Solar Glass for end customer

Preferable to have High:

• Light transmission to enhance

sunlight absorption

• Mechanical stability to protect solar

cell during the whole lifetime

• Weather-resistance to withstand

sand blast or chemical corrosion

• Cleaning attributes to ensure simple

and cheap maintenance

GlasJunction Box

& ConnectorsEVA Back-Sheet Frame

Did you know, that anti-reflective coating (ARC) glass can help to reduce light pollution?


How do we choose ideal glass for customers?

Choose advanced coating technology• Generally, Producers use anti-reflective coating (ARC) glass for higher module power

• Suntech focus on lifetime performance of ARC glass when choosing raw material

• The guaranteed long-term performance comes from the advanced coating technology

GlasJunction Box


Other vendor AR coating

Open pores with coarse surface

Uneven surface characters

Hard to clean

Connected “silicon wires”

Limited mechanical stability

Suntech AR coating

Closed pores with smooth surface

Better transmission

Easy to clean

Strong binding coating with glass

Better mechanical stability



• The manufacturing process is coating an AR film on un-tempered glass

first, then go through tempering process together with glass to enhance the

film’s strength.

GlasJunction Box


1. Loading 2. Edging 3. Purging

6. Blanking5. Tempering4. Coating



Focus on customer experience• There is a lot of dust in daily life, both on rooftops and utilities;

• Suntech ARC glass has better dust-resistance;

• Film used by other suppliers falls off easily

GlasJunction Box


Test Tool

Test condition:

Sand: 150um same to application

environment

Speed: 4.12m/s

Initial LT 3L 6L 9L 12L 15L 18L 21L

Suntech 94.35 92.74 92.72 92.68 92.35 92.35 92.34 92.32

A 93.17 91.73 91.52 91.45 91.43

B 93.79 92.14 91.45 91.45 91.43

91

91.5

92

92.5

93

93.5

94

94.5

95

Ligh

t Tr

ansm

itta

nce

Dust-resistant Test



Focus on customer experience• Suntech ARC glass has good cleaning properties

GlasJunction Box


Suntech Dust Cleaning Test

Dust is cleaned simply using water. Finger-prints can be wiped with alcoholic solutions

Result: Stains can be removed by a simple wipe.



Qualify with rigid internal tests

Key test itemsIEC

standardSuntech standard Suntech Advantages

Abrasion resistance None EN 1096-2

Ensure the AR coating is firm with less

falling off to guarantee reliable long

term performance

Acid-resistant test None GB/T 18915.1-2002

Ensure the glass still performs well

even in some harsh environments,

such as seaside, chemical factory, etcAlkali-resistant test None GB/T 18915.1-2002

Salt mist test None EN1096-2

Damp-heat testIEC 61215;

DH 1000

Double IEC 61215;

DH 2000

Testing beyond IEC guarantees higher

durabilityThermal cycling test

IEC 61215

TC 200

Double IEC 61215;

TC 400

Humidity-freeze testIEC 61215

HF 10

Double IEC 61215;

HF 20

GlasJunction Box



How do we choose ideal EVA for end customers?

Preferable to be aging resistant against:

Junction Box

& ConnectorsBack-Sheet FrameEVAGlass

Did you know, that aging of

EVA would result in power

degradation and reduced

module service life?

• Yellowing

• Oxidation

• Delamination

• Corrosion of electrodes

by acetic acid


We choose EVA by rigid internal aging test

EVA aging is more easily to happen under UV/high humidity or

temperature-unsusceptible conditions.

Junction Box


Aging test item Industrial standard Suntech standard Suntech Advantages

UV testIEC 61215;total UV irradiation of 15kWh/m2

Long-term UV test;total UV irradiation up to 330kWh/m2

22 times of IEC 61215 requirement, ensure superior UV durability of EVA

Damp HeatIEC 61215;DH 1000h

Double IEC 61215;DH 2000

Long term reliability test beyond IEC standard guarantee higher module durability

Humidity-FreezeIEC 61215;HF 10

Double IEC 61215;HF 20

Thermal cyclingIEC 61215;TC 200

Double IEC 61215;TC 400

Combined cycle None

Perform the three sequential IEC 61215 durability tests to the same module DH1000 -TC200-HF10


We keep contending with industrial challenges

Suntech PID resistant EVA

Junction Box


EVAVolume Resistivity of EVA

(Ω∙cm)

Power Deg.

(48 hours)

Power Deg.

(96 hours)Suntech’s selection

Supplier A #1 1.52×1014 62.33% хSupplier A #2 1.52×1014 72.75% хSupplier B #1 2.08×1016 1.68% 2.61% √Supplier B #2 2.08×1016 1.61% 2.48% √

• Suntech is doing thorough experiment on PID-

issue

• It is proved that EVA with certain characteristics

can effectively improve PID-resistance

• Best material, tight process control and rigorous

test condition makes truly PID-resistant PV moduleModule with

PID issue

Module

without PID

issue

STP’schoice


Ideal Backsheet for End Customer

Junction Box

& ConnectorsFrameGlass EVA Back-Sheet

Preferable to have:

• De-lamination avoidance

• Enough strength to bear &

protect cells

• Electrical security

• Environmental reliability

• Yellowing – resistant

Did you know, that the snail

tracks is mainly impacted by

back-sheet?


How do we choose ideal back-sheet for customer?

Junction Box


We choose most qualified raw material• There are many types of back-sheets in the market with different structure

• Suntech uses back-sheet made with higher durable fluorine based film

(PVF/PVDF)

Classification Characteristics Remarks

Fluoro

Composite High weather resistance

Reliable mechanical and physical propertyUsed by Suntech

Fluoro

Coating

Cheaper

Fluoro-film inhomogeneity

Fluoro-film easily cracking

Observable pin-hole issueUsed by majority of

other companies

Non-Fluoro

Composite

Higher tensile strength at first

Poor UV resistance, easily hydrolyzed

Weather resistance fades away when additive is used up

Poor tensile & bending strength under high humidity

Poor high-temp stability – easily degradable


How do we choose ideal back-sheet for customer?

Junction Box


We do test more rigid than industrial standardFirst 3 tests are not required in IEC standard

Key tests Referred Standard Chosen material Impact on module durability

Tensile Strength ≥ 300N/cmMD 500N/cm

TD 497.7N/cm Mechanical stability

Bonding Strength

with EVA≥ 40N/cm 200N/cm Potential de-lamination issue

Internal peel

Strength≥ 4N/cm

MD 5.5N/cm

TD 6N/cmPotential de-lamination issue

Bare board Ageing test*UV 60Kwh

No observed flawsPass Ageing-resistance, long term reliability

Laminator

Ageing test

UV 60Kwh

No observed flawsPass

Each combination of backsheet and

EVA is tested for double IEC standard

before usage

Laminator

Ageing test

DH 2000H

No observed flawsPass

Laminator

Ageing test

TC200 – HF20

No observed flaws**Pass

* Not every producer test the performance of backsheet under bare-board condition

** Not every producer test the performance of backsheet under combined testing condition


How do we choose ideal backsheet for customer?

Dust-resistant Test is designed to verify

abrasive-resistance, which is important to:

Protect inner layers & cells

Clear and even appearance

Adapt to harsh application environment

Film

ground

Off Φ≥4mm

Junction Box


25um PVF Specimen

Characteristic

Required

Volume

Used by Suntech Used by other producers

PVDF film PVF film PVF adhesivePTFE

coating

PVDF

coating

Thickness（um） 30 38 25 25 10

Critical volume（L）＞100 ＞100 70 38 16

Abrasive resistance

（L/um）＞3.3 ＞2.6 2.8 1.5 1.6


Ideal Junction-Box for End Customer

FrameGlass EVAJunction Box

& ConnectorBack-Sheet

Preferable to have:

• Strong adhesion with back-

sheet

• Outstanding waterproof

performance

• Excellent electrical contact

Did you know, that >50% of

solar module product recalls

was caused by J-box failure?


The advantage of Suntech’s J-Box

• Industry leading SABIC material for box (ex- GE Plastics)• High rigidity & Strength

• Elegant-shaped box body

• High heat & flame resistance

• Assembled with Original MC4 connector

• Highly standard protection rate (IP 67 rated)

IP 6 X

International Protection – Certified by IEC

Solid particle protection.

Rate 6(top rating): No ingress of dust

Liquid ingress protection

Rate 5: Water jets

Rate 7: Immersion up to 1 m

Producer J-box IP rating

Suntech IP 67

Yingli IP 65

Trina IP 65

CSI IP 65

FrameGlass EVAJunction Box

& ConnectorBack-Sheet


What is the real optimized frame solution?

Glass EVA Back-Sheet

Heavy ≠ Strong• The frame strength mostly depends on the designed structure rather than the weight.

• An overweighed frame will decrease the module mechanical strength

• An overweighed frame will also increase the transportation and installation cost.

High Nominal loading ≠ High actual reliability• High tested mechanical strength but with harsh installation methods means nothing to

practical application.

FrameJunction Box

& Connectors

Suntech knows the real optimized frame

High Strength but also Flexible Installation Provide executable solution

Stable but also Light Weight Improved handling and easier installation


We provide the best frame solution


Certified to withstand the strongest wind load and snow load but also:

• The most flexible installation method• Clamping zone optimized for EU roof tile

• Use fewest bolting holes to reach max loading

• Verified insertion method for special installation

• The lightest module weight

FrameJunction Box

& Connectors

* Insertion on short frame requires extra clamps on long frame to reach max loading

60-cell Module Suntech Trina Yingli CSI JA Jinko

Module Weight 18.2kg 18.6kg 18.5kg 18.5kg 18.2kg 18.5kg

Nominal (wind load)

Loading (snow load)

3800Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

Requirements to fulfill max loading

Clamping zone 300 mm 207mm 100 mm 70 mm 100 mm 140 mm

Required bolting holes 4 4 8 4 8 8

Insertion method• Long frame

• Short frame**N/A N/A

Lower

Max load

Similar to

STPN/A


We provide the best frame solution


Certified to withstand the strongest wind load and snow load but also:

• The most flexible installation method

• Widest clamping zone for max load

• Use fewest bolting holes to reach max load

• Verified insertion method for special installation

• The lightest module weight*

FrameJunction Box

& Connectors

* CSI and JA use 3.2 mm glass for 72-cell module leads to lighter module

** Insertion on short frame requires extra clamps on long frame to reach max loading

72-cell Module Suntech Trina Yingli CSI JA Jinko

Module Weight 25.8kg 27.6kg 26.0kg 22kg* 22.5kg* 26.5kg

Nominal (wind load)

Loading (snow load)

3800Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

2400Pa

5400Pa

Requirements to fulfill max loading

Clamping zone 300 mm 244 mm 6 clamps 80 mm 100 mm 200 mm

Required bolting holes 4 4 8 4 8 8

Insertion method• Long frame

• Short frame**N/A N/A

Lower

Max load

Similar to

STPN/A


Thank you

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