Sunshine is our business.

What makes a good solar module

Frank Heise / June 2011

AGENDA

About Centrosolar

What we take care of

About Centrosolar

2

ORGANISATION

Centrosolar

Sonnenstromfabrik

Wismar

Renusol

Köln

Centrosolar Glas

Fürth

Solarsquare

Schweiz

Centroplan

Geilenkirchen

Centrosolar AG

Hamburg

Paderborn

Kempten

International Sales

Organisations Spain, France, Italy, Greece,

Benelux, USA, SAS

Solar Key Components Integrated Systems

HISTORY OF SONNENSTROMFABRIK

3

August 2001

foundation as

SOLARA

Sonnenstromfabrik

Wismar GmbH

2003

expansion in

the TGZ +

additional

warehouse

2006 SOLARA AG

becomes part of the

Centrosolar AG

2001 1. Step in

„Technology- and

commercial centre

Wismar“ at

University Wismar

-2008 new name

CENTROSOLAR

Sonnenstromfabrik

GmbH

2005 new facility

(1000 m²) +

additional

warehouse

2008

Construction of new

site and facility

(15,000 sqm)

2010

Expanding to

200 MWp

About Centrosolar

2011

Expanding to

300 MWp

1996

Founding of

SOLARA AG

4

0

50

100

150

200

250

300

350

2001 2003 2005 2008 2009 2010 2011planned

Capacity growth in MWp of Sonnenstromfabrik

Capacity growth in MWp ofSonnenstromfabrik

About Centrosolar

CONSTANT GROWTH

One stop shopping at Centrosolar

5

About Centrosolar

SYSTEM SUPPLIER

6

SHOCK THERAPY

What makes a good module

What makes a good module

7

External

Product certification: IEC61215 /IEC61730/UL1730

Periodical factory inspection VDE, TÜV und UL

Certified Quality- and Environmental Management System

at CS Sonnenstromfabrik in Wismar according

ISO 9001:2008 and ISO 14001:2009

ISFH and Fraunhofer ISE: round robbin (modul power

confirmation)

Fresenius Institut: EVA curing rate (long term stability

assurance of EVA)

UV- and Climatic camber test (damp-heat, thermal-cycling,

humidity freeze)

QUALITY AND CERTIFICATION

REKNOWN HIGH QUALITY COMPONENTS

8

What makes a good module

HIGH QUALITY EQUIPMENT

9

What makes a good module

CONTROLLING SOLDERING QUALITY BY BEST PROCESS

10

Induction Soldering

-Low stress on cells

-Fast process

Hot Pin Soldering

-Stable process

-Process optimized for all

material cobinations

Hot Air Soldering

-Low stress on cells

-No touch of cells

What makes a good module

What makes a good module

11

INHOUSE TESTS

Internal Supplier qualification and evaluation, inclusive factory inspection

for all key suppliers

Detailed production control processes and control steps

Customer complaint analysis and systematical corrective action

implementation

Continuous improvement process

Knowledge influences supplier qualification

Plan to certify CS AG according ISO 9001 within this year

12

Cell tabbing & stringing

layup

interconnection of

strings, sheet feeding Lamination

Post lamination Framing

Measure-ment;

Packing

Solar cell

String connector

AR glass

Back skin EVA foil

Packaging

Connectors

Junction box

Aluminium frame Edge corner piece

What makes a good module

MODULE PRODUCTION PROCESS

QUALITY MONITORING

13

• Check of incoming goods

• Declaration of own charge system

• In house testings

• Field experience

• Test system on the factories roof

• Definition of supplier requirements

• Supplier audits

What makes a good module

FIELD EXPERIENCE

14

What makes a good module

200kW power

grid connected

different modules

different materials

datalogging

INHOUSE TESTINGS

15

What makes a good module

UV- and climatic

camber test

temperature

variation

damp-heat-test

reactivity of BSF

EVA curing rate

development of

own test

procedures

mechanical stress

test for frames,

glas, complete

modules

PULL-OFF-TEST OF SOLDER-CONNECTION AND EL-TESTING

16

What makes a good module

17

Junction box

- kind of protection: IP65

- CE conform

- Safety Class II

- robust and water proof

Bypass diode (Schottky diode)

- low voltage drop in case of bypassing

low power consumption

- ultra low reverse current (max. 5mA)

- wide temperatur range

- ensure modul power despite shadows

Connectors

- contact security

- small dimensions

- low transition resistance

- simple connect

Cable

- very robust and flexible

- large cross-section for high

currents

- resistance against abrasion,

chemicals,

weather and UV

What makes a good module

WE ALSO TAKE CARE OF

AND IF EVERYTHING WORKS WELL

18

Centrosolar

S-Series

or

Centrosolar

S-Class

modules

is

the

result

Sunshine is our business.

Thanks for your attension!

19

www.centrosolar.com

ISIN: DE0005148506

Prime Standard Deutsche Börse

This document contains forward-looking statements and forecasts based on assumptions and estimates made by CENTROSOLAR

Group AG management. While we assume that the expectations of these forward-looking statements are realistic, we cannot

guarantee that the expectations will prove to be correct. The assumptions may conceal risks and uncertainties which may lead to

actual results significantly divergent from those made in the projective forecasts. The factors that can cause such a divergence

include: changes in foreign exchange control or the economic and business environment, currency exchange rate fluctuations, the

low market entry barriers for competitors, insufficient acceptance of new products or services and changes in corporate strategy. No

update of the projected forecasts contained herein is planned, nor does CENTROSOLAR Group AG assume any obligation to do so.

Complete

Systems

Planning and

Projecting

Mounting

Systems

PV-Glas

Module

Manufacturing

Stand Alone

Systems

Thin Film Roof Integration

Sunshine is our business.