Selectronic SelectSun 20K User manual

Instruction Manual for
SelectSun 20K
Photovoltaic String Inverter
Installation • Operation • Service
Doc. No. | 982055
Version | 01
Date | 2018-03
Language | English

2 | Doc. No. 982055, Version 01, SelectSun 20K
Copyright
© Selectronic Australia Pty Ltd. All rights reserved.
This manual and the information included therein are the property of Selectronic Australia Pty Ltd.
No part of this manual is to be reproduced or copied without the express written permission of Selectronic
Australia Pty Ltd. Any unauthorized use of this manual is strictly forbidden.
Changes may be made to specifications, descriptions and delivery information.
Publisher
Selectronic Australia Pty Ltd | Suite 5, 20 Fletcher Road | Chirnside Park, Victoria, 3116 | Australia
Trademarks
All trademarks or registered trademarks are the property of their respective owners.
Disclaimer and Limitation of Liability
Selectronic Australia Pty Ltd assumes no liability in the event of damage as a consequence of the failure to
observe the warning instructions in these operating instructions or of improper usage.
The operating, maintenance and safety instructions are to be read carefully prior to installation and
commissioning.
The installation, commissioning and safety-related check must be undertaken by a qualified electrician.
Error-free and safe operation of the device requires proper and professional transport, storage, assembly,
and installation, as well as careful operation and maintenance.
Only accessories and spare parts approved by the manufacturer are permitted.
Technical modifications to the device are not permitted.
Adherence to the safety regulations and provisions of the country in which the inverter will be used are to be
observed.
The environmental conditions, technical calculation data and connection conditions of the grid operator given
in the product documentation must be upheld.
The technical data, calculation, connection and installation conditions are to be derived from the product
documentation and must be observed under all circumstances.
No liability is assumed for damages in connection with force majeure and disaster situations.

Table of Contents
Doc. No. 982055, Version 01, SelectSun 20K | 3
Table of Contents
Copyright ........................................................................................................................................................ 2
Publisher ........................................................................................................................................................ 2
Trademarks .................................................................................................................................................... 2
Disclaimer and Limitation of Liability .............................................................................................................. 2
Table of Contents ........................................................................................................................................... 3
1 About this Instruction Manual 6
1.1 Symbols and Markup .......................................................................................................................... 6
1.2 Warning Notices .................................................................................................................................. 6
1.2.1 Layout of a Warning Notice .......................................................................................................... 6
1.2.2 Categories of Warning Notices .................................................................................................... 6
1.3 Information .......................................................................................................................................... 7
2 Safety Information 8
2.1 Intended Use ....................................................................................................................................... 8
2.2 Qualification of Personnel ................................................................................................................... 8
2.3 Dangers Arising from Misuse .............................................................................................................. 9
2.4 Protection against Contact with Electrical Parts ............................................................................... 10
2.5 Protection against Contact with Hot Parts ........................................................................................ 10
2.6 Protection during Handling and Assembly ........................................................................................ 11
2.7 Please Note Before Starting Up ........................................................................................................ 11
2.8 Additional Symbols and Warning Notices on the Inverter ................................................................. 12
3 Description of Device 13
3.1 Infastructure Requirements ............................................................................................................... 13
3.2 Features of SelectSun 20K ............................................................................................................... 13
3.3 External Dimensions ......................................................................................................................... 14
3.4 Block Diagram ................................................................................................................................... 14
3.4.1 SelectSun 20K ........................................................................................................................... 14
3.5 DC Connection .................................................................................................................................. 15
3.6 Internal Data Logger ......................................................................................................................... 15
4 Installation 16
4.1 Assembly Site Requirements ............................................................................................................ 16
4.2 Transport ........................................................................................................................................... 17
4.3 Storage .............................................................................................................................................. 17
4.4 Checking scope of delivery ............................................................................................................... 18
4.5 Unpacking the Device ....................................................................................................................... 18
4.6 Installation ......................................................................................................................................... 19
4.7 Device connectors ............................................................................................................................. 20
4.8 Grounding .......................................................................................................................................... 21
4.9 Residual Current Protection .............................................................................................................. 21
4.10 Power Connection ......................................................................................................................... 21
4.11 Power Supply Line ......................................................................................................................... 23
4.11.1 Fitting of supplied power plug .................................................................................................... 23
4.12 Grid Line Impedance ..................................................................................................................... 25
4.13 DC connection PV generator ......................................................................................................... 26
4.13.1 DC-Connection .......................................................................................................................... 27

Table of Contents
4 | Doc. No. 982055, Version 01, SelectSun 20K
4.13.2 Connect PHOENIX CONTACT connector (SUNCLIX) .............................................................. 28
4.13.2.1 Connect cable ..................................................................................................................... 28
4.13.2.2 Disconnect connector ......................................................................................................... 29
4.13.2.3 Remove cable ..................................................................................................................... 29
4.14 Interface Port RS485 ..................................................................................................................... 30
4.15 Ethernet Interface Connection ....................................................................................................... 31
5 Commissioning 33
5.1 Turning on the Device ....................................................................................................................... 33
5.2 Setting the Country Code and the Menu Language .......................................................................... 34
5.2.1 Set Country Code/Grid Guideline .............................................................................................. 34
5.2.2 Accepting the Country Code ...................................................................................................... 35
5.3 Device Start ....................................................................................................................................... 35
5.4 Control Panel ..................................................................................................................................... 36
5.5 Basic Screen ..................................................................................................................................... 37
5.6 Graphical Display .............................................................................................................................. 37
5.7 Energy Yield Data Display ................................................................................................................ 38
5.8 Standardized Energy Yield Data Display .......................................................................................... 38
5.9 Input of Standardized Data ............................................................................................................... 38
5.10 Menu Structure .............................................................................................................................. 40
6 Configuration 41
6.1 Changing the Menu Language .......................................................................................................... 41
6.2 Limitation of the Power Output .......................................................................................................... 41
6.3 Monitoring Portal ............................................................................................................................... 42
6.4 PC Configuration Tool ....................................................................................................................... 42
6.5 Communication via Ethernet ............................................................................................................. 43
6.5.1 Automatic Setting via DHCP ...................................................................................................... 43
6.5.2 Manual Setting ........................................................................................................................... 43
6.6 Communication via RS485 ................................................................................................................ 44
6.7 Portal Monitoring ............................................................................................................................... 44
6.8 Sending Config .................................................................................................................................. 45
6.9 Portal Test Function .......................................................................................................................... 45
7 Troubleshooting 46
7.1 Self-Test – Error Message ................................................................................................................ 46
7.2 Transient Failure ............................................................................................................................... 46
7.3 Faults ................................................................................................................................................. 46
7.4 Fault Acknowledgement .................................................................................................................... 46
7.5 List of Error Messages ...................................................................................................................... 47
8 Options 53
8.1 Irradiation and Temperature Sensor ................................................................................................. 53
8.1.1 Inverter Sensor Interface ........................................................................................................... 53
8.1.2 Sensor Type Si-13TC-T-K Cable ............................................................................................... 53
8.1.3 Assembling of the Sensor Plug .................................................................................................. 54
8.1.4 Connection of the Sensor at the Solar Inverter.......................................................................... 54
8.1.5 Configuration .............................................................................................................................. 55
8.2 External Turn Off Signal .................................................................................................................... 56
8.2.1 Overview .................................................................................................................................... 56
8.2.2 Function ..................................................................................................................................... 56

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Doc. No. 982055, Version 01, SelectSun 20K | 5
8.2.3 Connections of the External Stop Signal (DRM 0)..................................................................... 57
8.2.4 Configuration of the External Stop Signal (DRM 0) ................................................................... 58
8.2.5 Attach the DRM 0 Sticker ........................................................................................................... 58
9 Maintenance 59
9.1 Maintain the Inverter ......................................................................................................................... 59
10 Decommissioning 60
10.1 Remove Inverter ............................................................................................................................ 60
10.2 Disposal ......................................................................................................................................... 61
11 Technical data 62
11.1 Inverter ........................................................................................................................................... 62
12 Certificates 64
13 Contact 65

About this Instruction Manual | Symbols and Markup
6 | Doc. No. 982055, Version 01, SelectSun 20K
1 About this Instruction Manual
These operating instructions form part of the product.
 Read the Instruction Manual carefully before installing and using the product.
 Keep the operating instructions readily available with the device for the entire service life of the
product.
 Provide all future users of the device access to the operating instructions.
1.1 Symbols and Markup
 Prerequisite
 One-step instruction
1. Multiple-step instruction
• Bulleted list
Highlighting Highlighting within a text
 Result
1.2 Warning Notices
1.2.1 Layout of a Warning Notice
SIGNALWORD / WARNING INSTRUCTIONS CATEGORY
Type and source of danger
Consequences if the warning is not observed
 Required action to avoid the risk
1.2.2 Categories of Warning Notices
DANGER
Leads directly to death or serious personal injury if ignored.
Follow the warnings to avoid death or serious injury!
WARNING
May result in death or serious personal injury if ignored.
Follow the warnings to avoid serious injuries!

About this Instruction Manual | Information
Doc. No. 982055, Version 01, SelectSun 20K | 7
CAUTION
May cause minor personal injury if ignored.
Follow the warnings to avoid injury!
NOTICE
Can lead to property damage if ignored.
Follow the warnings to avoid damage or destruction of the product!
This symbol represent important notes concerning potential harm to people, this
unit, or associated equipment.
1.3 Information
Note:
A notice describes information which is important for the optimum and cost-
effective operation of the equipment.

Safety Information | Intended Use
8 | Doc. No. 982055, Version 01, SelectSun 20K
2 Safety Information
2.1 Intended Use
The SelectSun 20K inverter, also referred to in these operating instructions as the inverter, is a solar inverter,
which transforms the direct current generated by the PV generator (photovoltaic modules) into alternating
current and feeds this to the public power supply network.
The inverter is manufactured according to the rules and current state of technology and takes into account
the valid EU, IEC and UL guidelines respectively.
The inverter fulfils the requirements according to protection class IP 65 / NEMA 4 and can be used indoors
and outdoors.
Any other use is not considered to be a designated use. The manufacturer accepts no liability for damages
resulting from this.
2.2 Qualification of Personnel
Target group for these instructions are professionals who can assess the assigned tasks due to their
professional training, knowledge and experience as well as knowledge of the relevant provisions and
recognize possible dangers.
Electrical work must only be carried out by qualified electricians.
Only suitably trained and qualified personnel are allowed to work on this inverter. Personnel are regarded as
being qualified if they are sufficiently familiar with the assembly, installation, and operation of the product as
well as with all warnings and safety measures set out in these operating instructions.

Safety Information | Dangers Arising from Misuse
Doc. No. 982055, Version 01, SelectSun 20K | 9
2.3 Dangers Arising from Misuse
DANGER
Danger to life from electric shock
 Device may only be installed and serviced by qualified specialist technical
personnel.
 Only class A modules according to IEC 61730 must be used.
 The PV generator must be free of earth potential.
 The PV generator must be designed in accordance with the technical data of
the inverter.
 Before connecting or disconnecting the DC plug always open DC switch.
 Every power supply line must be equipped with an appropriate AC-
disconnecting device.

A
consumer must never be switched between an inverter and line protection
switch.
 Access to the shutdown mechanism must always be free.
 Installation and commissioning must be carried out properly.
DANGER
Danger to life from electric shock
After the device has been switched off, the interior may still contain life-
threatening voltage
 Do not open inverter.
 Discharge time is at least 15 minutes.
DANGER
Danger to life from high discharge current
 It is essential to ensure an earthing connection has been established prior to
connection to the supply current circuit.

Safety Information | Protection against Contact with Electrical Parts
10 | Doc. No. 982055, Version 01, SelectSun 20K
2.4 Protection against Contact with Electrical Parts
DANGER
Danger to life, danger of injury due to high electrical voltage
 Installation of the inverter must only be carried out by trained specialist
personnel. In addition, the installer must be accredited by the responsible utility
company.
 General assembly and safety stipulations relating to working on high current
facilities must be followed.
 Before switching on, a check must be made to ensure that the plugs are firml
y
in place (locked).
 Before plugging or unplugging the DC plug, always disconnect the connection
to the PV generator.
 The feeder must be isolated and secured against being switched on again
before working at the AC grid.
2.5 Protection against Contact with Hot Parts
CAUTION
Danger of burns caused by hot surfaces on housings
At an ambient temperature of 45 °C, the upper part of the housing as well as the
refrigeration unit can reach a surface temperature of more than 75 °C.
 Do not touch the housing surface near to heat sources.
 Allow the device to cool down for 15 minutes before touching the surface o
f
the device.

Safety Information | Protection during Handling and Assembly
Doc. No. 982055, Version 01, SelectSun 20K | 11
2.6 Protection during Handling and Assembly
WARNING
Danger of injury during improper handling caused by crushing, shearing,
cutting, striking, and lifting
 The weight of the inverter is 38.4 kg kg!
 Follow the general setup and safety regulations for handling and assembly.
 Use suitable assembly and transportation equipment.
 Avoid trap and crush injuries by taking suitable precautions.
 Only use suitable tools. Use special tools where this is prescribed.
 Use lifting equipment and tools in a technically correct manner.
 If necessary, use suitable protective equipment (for example, goggles, safety
footwear, protective gloves).
 Do not stand under hanging loads.
 Remove any liquids onto the floor immediately to avoid the danger of slipping.
2.7 Please Note Before Starting Up
• In the event of installation in France, the device must be furnished with the warning sticker laid down
by UTE C 15-712-1. The warning stickers are included in delivery.
• Problem-free and safe operation of the inverter is conditional upon due and specialised
transportation, storage, assembly and installation as well as careful operation and maintenance.
• Only use accessories and spare parts approved by the manufacturer.
• Adherence must be ensured to the prescriptions and stipulations regarding safety of the country in
which the inverter is to be used.
• The ambient conditions stated in the product documentation must be observed.
• Starting up is prohibited until the entire system meets the national regulations and safety rules
regarding use.
• Operation is only permitted with adherence to the national EMC prescriptions for the present use
case.
• The manufacturer of the equipment or machine is responsible for ensuring compliance with the
thresholds required by the respective national regulations.
• For European countries, the EU Directive 2014/30/EU (EMC Directive) is to be observed when using
the inverter.
• The technical data, connection and installation conditions are to be taken from the product
documentation and must be observed under all circumstances.
• Switching off of the inverter must first be effected on the AC side via the circuit breaker. Then the
inverter is to be switched off on the DC side, should maintenance work need to be carried out on the
DC side.
• It is not necessary to switch off the inverter overnight, as the inverter switches off completely as soon
as no DC voltage is present at the input. If no switch-off is effected, the inverter switches on
automatically in the morning when the PV generator supplies sufficiently high voltage. This means
that the maximum output is generated.

Safety Information | Additional Symbols and Warning Notices on the Inverter
12 | Doc. No. 982055, Version 01, SelectSun 20K
2.8 Additional Symbols and Warning Notices on the Inverter
Indication of PV system
General warning sign
Warning of electrical voltage
Hot surface! The housing can get hot during use.
This symbol advises that the user handbook must be read
before the device is used.
The inverter must be earthed before use.
Before beginning of work switch unit free of voltage.
Warning of electrical voltage on DC and AC side.
All solar strings on the DC side are at voltage.
Discharging time of the device longer than 15 minutes.

Description of Device | Infastructure Requirements
Doc. No. 982055, Version 01, SelectSun 20K | 13
3 Description of Device
3.1 Infastructure Requirements
Additional required equipment 20K at the low voltage network
AC load break switch necessary
Central grid protection device (VDE-AR-N 4105) only for systems above 30 kVA required
Medium voltage transformer not necessary
The following points are to be considered when planning the infrastructure:
• The 20K can only feed into the low-voltage grid.
• The 5-wire power supply line must be equipped with an appropriate AC disconnecting device.
• If the inverters are connected with the medium-voltage-grid, it must be operated with electrically
isolating transformers.
• No other equipment may be connected between the transformer and inverters.
The following standards and technical regulations are also to be observed:
IEC 60364-4-41 Protection: Protection against electric shock
IEC 60364-4-43 Protection for safety - Protection against overcurrent
IEC 60364-5-52 Selection and erection of electrical equipment - wiring systems
BDEW Technical Guidelines
VDN Technical Guidelines
3.2 Features of SelectSun 20K
The SelectSun 20K is a transformer-less, three-phase solar inverter, which has a particularly high efficiency
at any operating point. Heat is dissipated only be convection. An internal monitor prevents the device from
exceeding the permissible ambient temperature. The inverter is designed such that the device does not have
to be opened for assembly and connection work. All electrical connections are exclusively made with
lockable connectors. The device features an integrated DC isolating switch according to EN 60947-3, which
reduces the overall installation work. The inverter provides the usual communication interfaces RS485 and
Ethernet. An illuminated graphical display shows the development of the feed-in power and other operating
data in a clearly arranged manner. An 8-key control panel below the display also provides excellent control
and navigation convenience. Based on its design in protection class IP 65, the inverter can be installed at an
outside location as long as it is not in direct sunlight. An installation protected against sunlight under the solar
modules is ideal here.

Description of Device | External Dimensions
14 | Doc. No. 982055, Version 01, SelectSun 20K
3.3 External Dimensions
Fig. 1: External dimensions
3.4 Block Diagram
3.4.1 SelectSun 20K
Fig. 2: Block diagram SelectSun 20K
1) DC overvoltage protection, type 3
2) AC overvoltage protection, type 3

Description of Device | DC Connection
Doc. No. 982055, Version 01, SelectSun 20K | 15
3.5 DC Connection
Fig. 3: Connection diagram
3.6 Internal Data Logger
The inverter features an internal data logger that allows measured values to be simultaneously recorded in
the form of parameters. If the storage capacity is full, the oldest data is overwritten. With the default setting
on delivery, the data logger logs 16 measuring channels.
Recording cycle Storage time
1 minute 2.5 years
2 minutes 5 years
5 minutes 12.5 years
10 minutes 25 years

Installation | Assembly Site Requirements
16 | Doc. No. 982055, Version 01, SelectSun 20K
4 Installation
4.1 Assembly Site Requirements
DANGER
Danger to life due to fire or explosion
 Do not install inverter in areas with risk of explosion.
 Do not install inverter on flammable materials. Uphold fire protection class
F30 according to DIN 4102 resp. the NFPA regulation
 Do not install inverter in areas where easily flammable materials are
stored.
 Under no circumstances are the cooling fins of the heat sink to be covered.
WARNING
Danger of accident
 When installing and servicing, unrestricted and safe access to the devices
must be ensured.
The following requirements of the installation site must be upheld:
• Only vertical installation is permitted as otherwise the cooling of the device cannot be guaranteed
(convection cooling).
• Do not subject the inverter to any direct sunlight.
• A fixed wall or a metal construction is necessary for installation. The weight of an inverter is 38.4 kg.
Relevant construction regulations must be observed.
• The device is to be mounted at an appropriate distance from combustible materials.
• Installation in non-ventilated ended cabinets and enclosures is not allowed because the unit in operation
emits heat.
• To allow for the heat dissipation required, keep the following minimum distances from the ceiling and
wall as well as from neighbouring devices:

Installation | Transport
Doc. No. 982055, Version 01, SelectSun 20K | 17
500 mm
50 mm 50 mm
500 mm
Fig. 4: Minimum distance
The device is best operated if the display is at eye level.
Protection class IP65 allows mounting in an outdoor area.
4.2 Transport
The devices must be transported under clean and dry conditions, if possible in their original packaging. The
transport temperature must be between -25 – +70 °C. Permissible variations in temperature may not exceed
20 °C (68 °F) per hour.
4.3 Storage
The devices must be stored in clean and dry premises, if possible in their original packaging. The storage
temperature must be in the range of -25 – +55 °C. Permissible variations in temperature may not exceed
20 °C (68 °F) per hour.

Installation | Checking scope of delivery
18 | Doc. No. 982055, Version 01, SelectSun 20K
4.4 Checking scope of delivery
The scope of delivery includes:
• Solar Inverter SelectSun 20K
• Wall-mounting bracket
• Supplement with the following content:
o 1x 5-pin contact insert, IP67, VC-TFS5-PEA for grid connection
o 1x adapter housing IP67 VC-K-T3-R (10-25) PLOMB for grid connection
o 2x cross-recessed flat-head screw, M5x20 => for mechanically securing the device in the wall
bracket
o 1x warning label in according UTE C 15-712-1 for installing in France
The screws for attachment to the wall are not included.
The IP67 VC-K-T3-R (10-25) PLOMB adapter housing allows sealing.
4.5 Unpacking the Device
NOTICE
Exposure to moisture, dust, or debris while unmounted in a non-vertical
orientation poses a risk of ingress
 Only unpack the device when it is to be installed. Failure to do so voids your
warranty!
The inverters are heaviest at the top. They are therefore packed upside down to facilitate transport. You will
therefore see the bottom side of the device (connectors) after having opened the package. Take the device
at the two holding grips that are visible on the side and remove it from the packaging. When being unpacked,
the device keeps the packaging grid locked in place on its housing. The packaging grid can be used to
deposit the device on the floor. This prevents the cover from being damaged.
Note:
The inverter contains electrolytic capacitors which can be stored for no more
than 1 year and at a storage temperature of ≤ 40 °C / ≤ 104 °F while in a de-
energized state. If the storage time has been exceeded, please contact
Selectronic Australia Pty Ltd Service before connecting the inverter to your
system!

Installation | Installation
Doc. No. 982055, Version 01, SelectSun 20K | 19
Fig. 5: Holding grip positions
4.6 Installation
Check the delivery before installation (see page 18).
CAUTION
Danger of injury
 Do not use the cover to hold the device. Only use the four holding grips to
move the device.
NOTICE
Danger of damage to property
 When designing the attachment of the wall-mounting plate, take the product
weight of 38.4 kg into account.
 Do not open device. Opening the device voids the warranty.
The inverter is mounted using the wall-mounting plate which is included in the scope of delivery.

Installation | Device connectors
20 | Doc. No. 982055, Version 01, SelectSun 20K
364 mm
76 mm
90 mm
315 mm
Fig. 6: Mounting the inverter
1. Use the wall bracket to mark the positions of the holes to be drilled.
2. Attach the mounting plate to the wall with the outer holes. The screws for attachment to the wall are
not included. Screws with a diameter of 6 mm must be used.
3. Push the cooling fins of the inverter into the tabs of the wall mounting plate. Push the inverter
upwards until it stops. Place the lower edge of the cooler onto the wall holder. Ensure that the rib
profile is locked behind the nuts.
4. Secure the inverter in these nuts using the enclosed screws (M5x20). As an alternative, you can also
use a padlock (shackle 4 mm in diameter) to protect the inverter against theft. The design of the wall
bracket ensures that the inverter is automatically centered in this bracket.
5. In order to avoid adhesive residue on the display, remove the display protection immediately after
installation.
4.7 Device connectors
The following figure shows the connectors of the inverter on its bottom side.
Fig. 7: Device connectors SelectSun 20K
The inverter is provided with the following connectors, as seen from left to right, top to bottom:
• 6 pair of PV generator connections
• RS485 connectors (IN and OUT)