SMA Sunny Boy SWR 1800U Stücklistenhandbuch

SB1800U-11:EE0402

Sunny Boy

SWR 1800U

Technical Description

Grid Tied String Inverter for Photovoltaic Systems

Issue 1.0

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 2- SMA Regelsysteme GmbH

Alteration Review

Document

Number

SB1800U

Issue

and Alteration

Review 1)

Comments Author

-11:EE0402 1.0 A First issue Homburg

1) A: Changes due to faulty documents or improvement of the documentation

B: Changes maintaining full or upward compatibility

C: Changes limiting or excluding compatibility

Name Date Signature

Approved Bremicker

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 3- SMA Regelsysteme GmbH

Table of Contents

1Introduction......................................................................................................... 4

2System Description ............................................................................................ 5

2.1 String Technology ...................................................................................... 6

2.2 Diagnosis and Communication .................................................................. 8

2.3 Technical design of the Sunny Boy............................................................ 9

2.3.1 Ambient Temperature............................................................................ 9

2.3.2 Sequential Control System .................................................................. 10

2.3.3 Stainless Steel Case ........................................................................... 10

2.3.4 Islanding Protection............................................................................. 11

2.3.5 Grid Monitoring.................................................................................... 12

2.3.6 Ground Fault Detector Interrupter (GFDI)............................................ 13

3System Monitoring and Diagnosis .................................................................... 14

3.1 Data Transmission via Powerline............................................................. 14

3.2 Data Transmission with a Separate Data Cable ...................................... 16

3.3 PV-System Management and Diagnosis.................................................. 18

3.4 Measuring Channels and Messages........................................................ 20

3.5 Measurement Precision ........................................................................... 22

4Technical Data ................................................................................................. 23

5Appendix .......................................................................................................... 31

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 4- SMA Regelsysteme GmbH

1 Introduction

You have decided to use one of the most sophisticated devices and for the most ad-

vanced modular PV system technology by purchasing a Sunny Boy® 1String Inverter.

SMA string technology has revolutionized parallel grid feeding. The SMA Sunny Boy

String Inverters are the most successful photovoltaic String Inverters in Europe. They

convince with their outstanding qualities concerning the efficiency and reliability and

make the installation of a PV-system most simple and affordable. Sunny Boy String

Inverters are the universal equipment for all applications – small or large scale PV-

systems.

The Sunny Boy has complete on board islanding protection and meets safety operat-

ing standards and code requirements world-wide. In North America, the Sunny Boy

meets the requirements of UL 1741. NEC 690 building code requirements for photo-

voltaic systems will be met with the internal ground fault detector interrupter (GFDI).

In Australia Sunny Boys are certified according to the “Australian Guidelines” and the

regulations of the IEC950. In the United Kingdom Sunny Boys passed the tests in

accordance with the “engineering recommendation G77”. The Sunny Boys comply

with all regulations from the VDEW (Association of German Electricity Producers) for

the supplementary grid feeding to the low voltage electricity grid of the utility. This

contains the regulations concerning the “Independent Disconnection Device” known

as MSD (Mains monitoring device with allocated Switching Devices) and the regula-

tions of the DIN VDE 0126. Furthermore the Sunny Boy complies with the according

standards and the low voltage regulations as certified in the CE declaration (see ap-

pendix).

1Sunny Boy is a registered Trademark of SMA Regelsysteme GmbH

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 5- SMA Regelsysteme GmbH

2 System Description

The reduction of CO²emission and other pollution resulting from energy conversion is

becoming more and more important. The direct conversion of solar radiation to elec-

tric energy (photovoltaics) will play a substantial role in this essential matter.

Supplementary grid feeding includes the conversion of the DC voltage from the PV-

panel to grid compatible AC voltage with so-called ”inverters“ and the subsequent

connection to the electricity grid in the house distribution.

Here the electricity from the PV-modules provides all consumers with electric power

(household devices, lights etc.). In case that not enough energy is produced the addi-

tionally necessary energy is obtained from the grid. In case that there is a surplus of

energy, this surplus is fed into the local grid and is therefore available for other con-

sumers. This way every single kilowatt-hour is utilized and the electricity company’s

power systems are relieved. In the most simple case a PV-system therefore consists

of two basic components: the PV-panel and the inverter.

Fig. 2.1: Grid tied String Inverter application

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 6- SMA Regelsysteme GmbH

2.1 String Technology

The experience with several thousand grid-connected PV-systems in Europe with an

output range from one to several hundred kilowatts has shown that the costs for grid

connecting and monitoring the PV-system add up to almost 50 % of the costs for the

entire system. The reduction of these costs, especially the costs for the cabling on

the DC side and the subsequent distribution on the AC side, was the reason for de-

veloping the String Technology from SMA. The Sunny Boy finally enabled the string

technology to be the standard system design for PV-systems.

String technology means that a small number of PV-modules are connected in series

to a ”string“, each string is then connected to a separate inverter which feeds the

electricity of one string to the grid. Large PV-systems consist of a large number of

single strings. The energy produced is collected directly on the AC side which results

in the fact that the system design gets very simple and no extraordinary DC cabling is

necessary anymore. String Technology allows MPP tracking for each small module

group, thus improving system efficiency by 1 – 3%.

The most various system concepts can be realized with this strategy. A wide range of

differently scaled inverters and peripheral components is available:

Sunny Boy Inverters:

• Sunny Boy 700:

The small model for small PV-systems with simple extension possibilities and

configurable input voltage range

• Sunny Boy 850:

The output optimized inverter for PV-systems with 1 kWp

• Sunny Boy 1100E:

For PV plants with 1 kWp; supports a wider input voltage range

• Sunny Boy 1700E: For PV plants around 2.2 kWp / wide input voltage range

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 7- SMA Regelsysteme GmbH

• Sunny Boy 2000:

The transformerless String Inverter with extended input voltage and increased

efficiency, ideal for large PV-systems.

• Sunny Boy 2500U:

The powerful String Inverter with electric separation, ideal for large PV-systems.

• Sunny Boy 3000:

The powerful String Inverter with electric separation and optimum efficiency,

ideal for large-scale plants.

• Sunny Display

Lid integrated LCD for all Sunny Boys, cyclic display of all relevant operating

data

• Sunny Data:

The PC-program for the communication with your Sunny Boy inverters

• Sunny Boy Control:

The terminal for your PV-system for data acquisition and evaluation - for up to

50 Sunny Boys - communication via Powerline or RS232/RS485

• Sunny Boy Control LIGHT:

Terminal for PV systems with up to 20 Sunny Boys - communication via Power-

line

• Sunny Boy Control PLUS:

The terminal for your PV-system for data acquisition and evaluation - for up to

50 Sunny Boys - communication via Powerline or RS232/RS485 - additional

digital I/O channels for nearly any sensor type - continuous standalone data

storage and remote access via modem etc.

• Sunny Data Control:

The PC-program for visualization of the data from your Sunny Boy Control

The Sunny Boy Family is the result of consistent development with SMA´s experi-

ence in PV conversion with over 130 MW of total nominal inverter output power in

over 90,000 units with nominal powers from 700 W up to 500 kW (update: 01/02).

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 8- SMA Regelsysteme GmbH

2.2 Diagnosis and Communication

The modular PV system technology leads to a spread out distribution of the Sunny Boy

String Inverters. A simple and fast function monitoring of the status and measured val-

ues for each single Sunny Boy is easy to achieve. The data is either displayed on the

LCD of the Sunny Boy Control or is shown on the screen of a PC running the according

SMA software. Two programs ”Sunny Data“ and ”Sunny Data Control“ are based on a

comfortable Windows GUI and allow the user to process the data with other programs

such as MS Excel®.

The data transmission is done via Powerline (see chapter 3.1). SMA supports the fol-

lowing monitoring strategies for Sunny Boy String Inverters:

• PC with software package Sunny Data for small and medium size PV-systems -

also for Sunny Boy Control and Sunny Boy Control Light

• Sunny Boy Control as standalone controller for nearly any PV-system size

• PC with software package Sunny Data Control for enhanced operation together

with the Sunny Boy Control

These monitoring concepts support the following features:

• Continuous acquisition of operation data of all connected String Inverters and

their PV-panels

• Supervision of operating states and failure indication

• Spot value transmission from single Sunny Boys

• Identification of failures in the single strings

• Graphical representation of the data from single Sunny Boys or comparison of

the data from several ones

• System management, transmission of operation parameters

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 9- SMA Regelsysteme GmbH

2.3 Technical design of the Sunny Boy

The Sunny Boy inverter is based on a power unit that operates with a very high effi-

ciency and optimal reliability. An IGBT H-bridge converts the voltage coming from the

PV modules to a high frequency secondary circuit with 16 kHz. The voltage is then

fed to the grid after being processed by a transformer.

Fig. 2.2: Block circuit diagram of the Sunny Boy 1800U

The Sunny Boy 1800U is designed for strings with 11 to 16 standard modules con-

nected in series.

A micro controller manages the current control which results in a perfectly sinus wave

AC current with very low harmonic distortion. Both operation with a fixed voltage or

with MPP tracking is possible.

2.3.1 Ambient Temperature

The heat sink of the Sunny Boy is necessary in order to let thermal energy dissipate.

Once the heat sink gets too hot the Sunny Boy reduces the output energy accord-

ingly but nevertheless keeps feeding to the grid.

Sunny Boy 1800U Technical Description

SB1800U-11:EE - 10 - SMA Regelsysteme GmbH

2.3.2 Sequential Control System

The sequential control system also manages the communication with the system

monitoring tools Sunny Data and Sunny Data Control. The Sunny Boy therefore is

not only a simple standalone device - it can be part of one big PV-system that has

one central control and monitoring facility.

2.3.3 Stainless Steel Case

The case of the Sunny Boy is made of stainless steel which protects the inverter from

dust and water up to enclosure type NEMA 4X. The Sunny Boy can therefore be

mounted nearly anywhere inside or outside the house with an ambient temperature

range of -13 °F…140 °F (-25°C to +60°C). All applicable standards and regulations for

personnel safety and EMI are complied with.

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