Q3 ENERGIE QX3 Series User manual

Installation and operating instructions
QX³4000 QX³5000 QX³6000 QX³7000
QX³8000 QX³10000 QX³13000
QX³15000 QX³18000

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Q3 ENERGIE Installation and operating instructions QX³ series 2/109
Version 1.0, Stand 27.04.2015
Installation and operating instructions
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Inhaltsverzeichnis
1 General notes.......................................................................................................................................................................................5
1.1 Conventions used in this manual ....................................................................................................................................6
1.2 Area of validity....................................................................................................................................................................8
1.3 Documentation structure..................................................................................................................................................8
2Safety ...............................................................................................................................................................................................9
2.1 Qualified personnel ............................................................................................................................................................9
2.2 Intended use .....................................................................................................................................................................10
2.3 General safety instructions.............................................................................................................................................11
2.4 Lightning protection.........................................................................................................................................................12
2.5 Country code .....................................................................................................................................................................13
2.6 Transport and Storage ....................................................................................................................................................13
2.7 Outbreak of fire ................................................................................................................................................................14
2.8 Maintenance, service and faults....................................................................................................................................15
3Product description ..................................................................................................................................................................16
3.1 Design .....................................................................................................................................................................................
17
3.2 Scope of delivery ..................................................................................................................................................................17
3.3 Unit identification .................................................................................................................................................................18
3.4 Functional description..........................................................................................................................................................18
3.4.1 Block circuit diagram ........................................................................................................................................19
3.5 PV module cable wiring...................................................................................................................................................20
4 Installation .........................................................................................................................................................................................21
4.1 Installation site and minimum clearances .......................................................................................................................22
4.2 Unpacking the inverter ........................................................................................................................................................23
4.3 Installing the inverter ..........................................................................................................................................................23
4.4 Electrical Connection ..........................................................................................................................................................28
4.5 Connection range .............................................................................................................................................................29
4.5.1 QX³4000-8000.......................................................................................................................................................29
4.5.2 Internal connection area for accessories and network ..............................................................................30
4.5.3 QX³10000-18000 ..............................................................................................................................................31
4.6 Earthing..............................................................................................................................................................................32
4.7 FI/RCD protection.............................................................................................................................................................33
4.8 AC mains connection .......................................................................................................................................................33
4.9 Assembling the DC plug-in connector ..........................................................................................................................38
4.10 Assembling the sensor plug/remote plug ...................................................................................................................46
4.10.1 QX³10000-18000 ..............................................................................................................................................46
4.10.2 QX³4000-8000 ...................................................................................................................................................47
4.11 Sensor connection (SENSOR) ........................................................................................................................................48
4.11.1 Radiation and temperature sensor ................................................................................................................48
4.11.4 S0-Interface .......................................................................................................................................................50
4.12 Ripple control receiver for active power control (REMOTE) ....................................................................................52
4.12.1 QX³10000-18000 ................................................................................................................................................53
4.12.2 QX³4000-8000 ...................................................................................................................................................54
4.13 Signal/control contact (RELAY) .....................................................................................................................................55
4.13.1 QX³10000-18000 ..............................................................................................................................................55
4.13.2 QX³4000-8000 ...................................................................................................................................................56
4.14 Interconnecting an inverter group................................................................................................................................57
4.14.1 Connecting via Ethernet...................................................................................................................................57
4.14.2 Connecting via field bus...................................................................................................................................58
4.15 USB-connection ................................................................................................................................................................60
4.16 Commissioning..................................................................................................................................................................60
4.17 Switch on the inverter.....................................................................................................................................................61

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Q3 ENERGIE Installation and operating instructions QX³ series 3/109
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4.18 Setting up communication and accessories................................................................................................................61
4.19 Making the connection to the web server of the inverter........................................................................................61
4.20 Installation assistant .......................................................................................................................................................62
5Operation and monitoring using the display..................................................................................................................64
5.1 Determining the operating state .......................................................................................................................................64
5.2 Menu display..........................................................................................................................................................................65
5.3 Configuration ..................................................................................................................................................................71
5.3.1 MPP-Tracker ..........................................................................................................................................................71
5.3.2 Inverter................................................................................................................................................................71
5.3.3 Sensors................................................................................................................................................................71
5.3.4 Display .................................................................................................................................................................71
5.3.5 Date/time ............................................................................................................................................................71
5.3.6 LAN .......................................................................................................................................................................72
5.3.7 RS485 ..................................................................................................................................................................72
5.3.8 S0-Interface .......................................................................................................................................................72
5.3.9 Passwords ...........................................................................................................................................................72
5.3.10 Service.................................................................................................................................................................72
5.4 Display settings, operating values and measured values........................................................................................73
5.4.1 Measurement values.........................................................................................................................................73
5.4.2 Yields....................................................................................................................................................................74
5.4.3 Information.........................................................................................................................................................74
5.4.4 Group devices.....................................................................................................................................................75
5.5 Backing up data, system recovery and inverter update ..........................................................................................76
6Operation and monitoring via the web interface .........................................................................................................77
6.1 Operating data..................................................................................................................................................................77
6.1.1 Login.....................................................................................................................................................................77
6.1.2 Overview .............................................................................................................................................................78
6.1.3 DC Input..............................................................................................................................................................80
6.1.4 AC Output............................................................................................................................................................81
6.1.5 Progression .........................................................................................................................................................82
6.1.6 Event log .............................................................................................................................................................82
6.2 Settings ..............................................................................................................................................................................83
6.2.1 Language.............................................................................................................................................................83
6.2.2 Date and time ....................................................................................................................................................83
6.2.3 Location ...............................................................................................................................................................84
6.2.4 MPP-Tracker........................................................................................................................................................85
6.2.5 Network ...............................................................................................................................................................87
6.2.6 Safety...................................................................................................................................................................87
6.2.7 Fieldbus ..........................................................................................................Fehler! Textmarke nicht definiert.
6.2.8 Sensors................................................................................................................................................................88
6.2.9 Self consumption ...............................................................................................................................................89
6.2.10 Firmware Update ...............................................................................................................................................90
6.2.11 Logging off Admin .............................................................................................................................................91
6.3 Installer area.....................................................................................................................................................................91
6.3.1 Installation – panel configuration ..................................................................................................................91
6.3.2 Installation – power supply company settings............................................................................................92
6.3.3 Installation – System replication....................................................................................................................94
6.3.4 Power reduktion.................................................................................................................................................95
7Status- and Fault Messages ..................................................................................................................................................97
8Maintenance ..............................................................................................................................................................................100
8.1 Switch off inverter..........................................................................................................................................................100
8.2 Shutting down and dismantling the inverter............................................................................................................101
8.3 Replacing an inverter ....................................................................................................................................................102
9Appendix.....................................................................................................................................................................................103

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Q3 ENERGIE Installation and operating instructions QX³ series 4/109
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9.1 Technical data.................................................................................................................................................................103
9.1.1 Temperature behaviour (power reduction) QX³4000..................................................................................103
9.1.2 QX³5000............................................................................................................................................................103
9.1.3 QX³6000............................................................................................................................................................104
9.1.4 QX³7000............................................................................................................................................................104
9.1.5 QX³8000............................................................................................................................................................105
9.1.6 QX³10000..........................................................................................................................................................105
9.1.7 QX³13000..........................................................................................................................................................106
9.1.8 QX³15000..........................................................................................................................................................106
9.1.9 QX³18000..........................................................................................................................................................107
9.2 Certificates.......................................................................................................................................................................107
9.3 Environmental compatibility ........................................................................................................................................107
9.4 Warranty and service information ..............................................................................................................................108
10 Contact ........................................................................................................................................................................................108
11 Glossary ......................................................................................................................................................................................108
These installation and operating instructions should provide exact, complete
and comprehensive information. This information corresponds to the device
version at the time of printing. Q3 ENERGIE takes no responsibility for direct,
indirect or incidental damage to persons or material caused by wrong
interpretation of or unintended errors in these installation instructions.
Any liability on the part of the company Q3 ENERGIE for consequential
damage arising from improper use or incorrect installation of the inverter is
expressly excluded.
This document must not be copied in whole or in part nor otherwise
reproduced without the explicit written consent of Q3 ENERGIE.
Copyright © 2015
All rights reserved.
This manual is protected by
copyright. The copyright is held
by the company:
Q3 ENERGIE GmbH & Co. KG
Trademarks:
All trademarks used are the property of their respective owners.
Subject to technical changes, changes in appearance and printing errors.

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Q3 ENERGIE Installation and operating instructions QX³ series 5/109
Version 1.0, Stand 27.04.2015
Installation and operating instructions
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1 General notes
These instructions describe the installation and operation of the photovoltaic
inverter.
To ensure correct and safe installation as well as smooth running of the
system, the user should study these instructions carefully. All the information
contained therein must be strictly observed!
This avoids:
any danger during installation and operation
risks to the installer/operator
material damage
In addition downtimes will be reduced and the reliability and service life of
the system increased.
These installation instructions should be kept in a safe place for later use.
These instructions are intended for the installer and operator of the photovoltaic inverter!

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Q3 ENERGIE Installation and operating instructions QX³ series 6/109
Version 1.0, Stand 27.04.2015
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1.1 Conventions used in this manual
The following symbols and notations are used in this manual:
Pictographs/Symbols:
Symbol Meaning
Caution!
This symbol indicates safety instructions that if not observed could result in a
danger to persons or damage to the device and other objects. The symbol is
found where there is imminent danger.
Risk of electric shock!
Warning against dangerous electrical voltage. Do not open the device! There
could be life-threatening voltages inside the device even when it is switched
off!
Risk of explosion!
Warning against explosion. Life-threatening ignition energy could occur that
ignites explosive atmospheres, gasses or dust.
Material risk, no danger to humans
If this instruction is not followed, it may result in property damage.
Note:
This symbol indicates peculiarities and indicates tips and hints for
handling the device.
Non-observance of the safety instructions and danger warnings can lead to death or
serious injury!
Warning-/danger level:
Signalword
1
Probability Consequences
DANGER Imminent danger Death or serious, irreversible injury
WARNING Potential danger Death or serious, irreversible injury
CAUTION Potential danger Slight, reversible injury
NOTE Possible damage to property No injury, property damage.
References are given in square brackets in the text: [xx]
The contents of these instructions correspond to the technical standard at the time of printing. The display
menu and web interface may differ in some points from the description given here as a result of continuous
improvements and expansion of the product. You will find the latest version of the description in the
download area at http://www.q3-energie.de
1
Signalwords in compliance with ANSI Z535 / ISO 3864-2

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Symbols:
Symbol
2
Meaning
Warning of a danger point: Denotes instructions, which if not observed
could present a risk to health, functional capability or safety.
Warning against dangerous electrical voltage.
Warning against hot surfaces
Warning against an electromagnetic field
Warning against explosion.
Warning of danger caused by batteries.
Warning against suspended loads.
Warning against ESD sensitive components.
Do not extinguish with water!
(DC) direct voltage or current
(AC) alternating voltage or current
Earth
Denotes additional information and instructions.
Recycling marks
Communauté Européennes/CE marking
Identification of assemblies or parts, which must be disposed of in a
specific manner. Never dispose of these components in the normal
waste.
Protect against the effects of weather
Fragile!
This way up!
“ I n f ormatio n si gn ”
2
Symbole as per: ISO 3864-2

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Q3 ENERGIE Installation and operating instructions QX³ series 8/109
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1.2 Area of validity
These instructions describe the installation of the following types of PV inverters.
Area of validity:
Typ designation Nominal power
QX³4000 4kVA
QX³5000 5kVA
QX³6000 6kVA
QX³7000 7kVA
QX³8000 8kVA
QX³10000 10kVA
QX³13000 13kVA
QX³15000 15kVA
QX³18000 17kVA
1.3 Documentation structure
Keep all the instructions for the PV inverter and the integrated components safely
together with the system documentation. The system documentation must always
be kept available. The following documents are delivered together with the PV
inverter; all others can be downloaded from our website at http://www.q3-
energie.de.
Documentation:
Document Contents
Installation and Operating Instructions
Setup, installation and operation

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2Safety
In order to avoid hazards (injury and/or material damage) all instructions
must be read before commissioning!
WARNING
The entire installation instructions must be read before any work is started!
Be sure to observe all the safety instructions.
WARNING
Incorrect handling of the PV inverter and non-compliance with the indicated
warning and safety instructions as well as improper intervention in the safety
features and the device itself can result in material damage, bodily injury, electric
shock and in extreme cases even death.
The connection of the electrical equipment is part of the installation in
readiness for operation. Note that the electrical installation and the connection
of the inputs and outputs must be carried out in accordance with the local
regulations. Installation must be carried out by qualified personnel! The general
setup and safety instructions concerning handling and installation must be
observed!
2.1 Qualified personnel
WARNING
This document is compiled for trained and qualified specialists! Qualified
personnel have the expertise to recognise risks and to avoid potential danger.
There is a risk of injury from improper handling. The
basics of PV systems are not explained!
Installation, maintenance and repair of the inverter system may only be
carried out by qualified and trained specialists! The documentation must be
complied with!
International, national and any regional rules and regulations for electrical
engineering must be observed under all circumstances. Relevant knowledge of
electrical engineering is assumed.

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Q3 ENERGIE Installation and operating instructions QX³ series 10/109
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2.2 Intended use
The inverter may only be used in grid-connected photovoltaic systems
with the permissible rating and within the permissible ambient
conditions.
The inverter may only be operated for power supply with the maximum
permissible connection values in compliance with the technical data, in the
position of use and mode of operation indicated. The inverter is intended for
stationary use! Only this intended use is permissible.
Unauthorised modifications and changes, the use of spare parts and
replacement parts that have not been approved by Q3 ENERGIE or any other
kind of use is not permitted. Warranty claims and the operating licence become
immediately null and void in such cases.
CAUTION
Safety risk if unsuitable PV modules are used.
The inverter is not suitable for use with PV modules that require pole
earthing.
Only ever operate the inverter with protection class II PV generators!
Only ever connect to PV modules as energy sources!
The inverter must be installed as a stationary installation.
The inverter and all components of the PV system must always be operated within
their specific limits.
CAUTION
Only ever use PV modules that conform with IEC 61730 Class A and have a
maximum system voltage of 1000 VDC.
CAUTION
All communication points and interfaces of the device are specified as safety extra-
low voltage (SELV). It is essential you ensure that the interfaces of any connected
devices also comply with the requirements of safety extra-low voltage.
CAUTION
Material damage and personal injury cannot be excluded in the case of
improper use or non-compliance with the instructions in this manual. Q3
ENERGIE is not liable in such cases. In particular material damage to the
inverter is not covered by the Q3 ENERGIE warranty in such cases.

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2.3 General safety instructions
This documentation and the safety instructions contained therein must be read
carefully before the inverter is installed or put into operation. The
documentation must always be kept close to the device for later reference.
DANGER
Dangerous electrical voltage!
Installation, maintenance and repair of the inverter system may only be carried out
by qualified and trained specialists! The documentation must be complied with!
DANGER
Dangerous electrical voltage!
The DC connection cables become live as soon as the PV modules are exposed to
the sun.
DANGER
Do not open the device - dangerous electrical voltage inside the device!
The device does not need to be opened for installation or operation.
DANGER
High fault currents (leakage currents):
A proper earth connection must be ensured before connecting to the mains!
DANGER
Risk of explosion and fire if not installed correctly.
DANGER
Attention, risk of electric shock, energy storage device is discharged under time
control. (5 minutes)
WARNING
When connected, all connectors are at mains potential. Dangerously high voltages
can also be present at the connectors becauseon device-internal charged
capacitors, even when the device is disconnected.
WARNING
Isolation of electrical connections
Plug connectors and connection cables must not be disconnected while under
electrical load! (Risk of electric arcs)
WARNING
The DC load circuit breaker does not achieve complete disconnection. The inverter
is not completely disconnected from the PV generator until the plug connectors are
also disconnected. Plugging and unplugging the plug connectors is permissible
under voltage – but not under load.
WARNING
Possible health hazards due to the effects of radiation!
Do not remain permanently in the immediate proximity of the inverter.
People with implants or pace makers should consult their doctor before
working on electrical systems. elektrischen Anlagen vornehmen, ihren Arzt
konsultieren.

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CAUTION
Risk of burning due to touching hot parts
Where there are high ambient Temperatures, the Temperature on the surface
of the de v i ce housing may exceed 70°C .
Allow sufficient time for the device to cool down before touching it.
CAUTION
The user may only carry out operating functions!
CAUTION
Earthing the PV inverter
The inverter may only be operated on earthed grids. Once the device has been
installed and commissioned, the earthed network point or neutral conductor
must not be disconnected.
The system must not be operated without a protective earth.
CAUTION
Earthing the PV generator
Pay attention to the local regulations for earthing the PV modules and the PV
substructure. Q3 ENERGIE recommends combined connection and earthing of the
substructure and other conductive areas, in order to achieve the highest possible
protection for the system and for persons.
CAUTION
It is essential that you observe the sequence of the connection instructions in this
manual.
CAUTION
Do not remove the identification label or information sign affixed to the PV
inverter!
2.4 Lightning protection
If the building has external lightning protection, type 2 overvoltage
protection is compulsory at the AC and DC side and must be installed by
the customer.
If the building does not have external lightning protection, we recommend
that the customer installs type 2 overvoltage protection at the AC and DC
side.

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2.5 Country code
The country code defines country-specific grid monitoring parameters. You must
select the country code in the installation assistant when you commission the
device. Once you have done this it can only be changed again with the help of the
password of the installer. The system language can be set independently of the
country code selected.
NOTE
Once selected and acknowledged country codes can only be changed by service
personnel.
You can no longer change the country code once it has been set and acknowledged.
In compliance with regulations the country code can only be changed by Q3
ENERGIE service personnel or the installer.
NOTE
Withdrawal of the operating licence!
If you operate the inverter with the wrong country code, the power supply
company can withdraw your operating licence.
Q3 ENERGIE bears no liability for damage arising from an incorrectly set country
code.
2.6 Transport and Storage
Transport:
The devices must be transported clean and dry at a Temperature between
– 25°C and +70°C.
Storage:
The devices must be stored in a clean and dry place at a Temperature between
– 25 °C and + 55°C.
If the storage period has exceeded two years, please contact our Service
Department before connecting the system (see Chapter 11).
NOTE
Please use the original packaging if you return a device.

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2.7 Outbreak of fire
WARNING
Avoid the risk of fire
Parts of the housing, e.g. cooling elements, can get hot during operation.
 Allow the device to cool down before undertaking any
maintenance work.
 Comply with the regulations for selecting an installation site.
 Keep ventilation openings free.
 Do not store flammable or highly flammable materials near the
inverter.
WARNING
Outbreak of fire
Dangerous voltages are present within the inverter even when fuses have blown!
For this reason, if fire should break out, do not use water to extinguish the fire.
Use sand, carbon dioxide or powder extinguishers.

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2.8 Maintenance, service and faults
DANGER
Risk of electric shock!
Even when disconnected from the mains supply, the inverter is still connected to
the PV generator circuit and is at a dangerous voltage potential. Therefore,
disconnect the PV generator circuit and the AC connector before carrying out any
service or maintenance work. Then check for absence of voltage (DC and AC)!
DANGER
Service and maintenance
Maintenance and service work on the PV inverter must only be carried out by an
electrically skilled person.
Disconnect the PV inverter (AC and DC side) before starting work.
After disconnecting, wait for at least 15 minutes to allow the internal electric
storage devices (capacitors) to discharge.
Work on PV generators may only be carried out and supervised by persons
with the appropriate specialist knowledge of the required safety rules.
Unauthorised personnel must be kept away from PV generators and PV
inverters.
The following safety rules must be observed when working on an inverter:
Wristwatches, rings and other metal objects must be removed in advance
Use only insulated tools
The inverter must not be dismantled or opened
Service:
For more detailed information call our service centre.
Q3 ENERGIE GmbH & Co. KG
Innovapark 20
87600 Kaufbeuren
Deutschland
Q3 ENERGIE Service
Telefon: [phone]
Telefax: +49 (0)3121/1370 654
E-Mail: [email protected]
Internet: www.q3-energie.de

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Q3 ENERGIE Installation and operating instructions QX³ series 16/109
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3Product description
The PV inverter converts the DC current generated by PV modules into
symmetrical, three-phase alternating current.
The generated AC current is fed into the grid of the power supply company.
The inverter is characterised by having the following features:
Maximum efficiency of up to 98%
High input voltage range of 120V – 1000V
The inverter has an extremely wide DC input voltage range. Almost any string
configuration can therefore be implemented with one device.
Integrated data logger and web server for online system monitoring
Installation times are reduced in particular by the following features

“ P l ug & P l ay ” i nstal l atio n without having to open the cover of the housing
Direct connection to an irradiation and Temperature sensor
Direct connection to a ripple control receiver without any additional hardware
Integrated DC circuit breaker in compliance with EN 60947-3
Can be used outdoors due protection class IP54 (QX³5000-18000) or IP65
(QX³4000)
Illuminated graphic display for analysing and setting the inverter parameters
The inverter has the following interfaces:
Ethernet
RS485
USB (with QX³4000-8000 only for service)
Direct connection to a ripple control receiver possible
Connection for an irradiation and Temperature sensor
Potential-free contact

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3.1 Design
Control/function elements:
No. DESCRIPTION No. DESCRIPTION
1 Type plate 5
“ F ee d - i n mode” LED
2 * Exhaust openings (left and right) 6
“ F au l t” LED
consult the manual!
3 LC display 7 AC power plug
4 Control keys
* only QX³8000-18000
3.2 Scope of delivery
1 x inverter
1 x installation material
1 x power plug housing Phoenix Contact VC-K-T3-Z
1 x power plug contact insert Phoenix Contact VC-TFS 5-PEA
1 x power plug cable gland PG21 Phoenix Contact VC-K-KV-PG21
PV plug-in connector plus: Phoenix Contact PV-CF-S 2,5 – 6 (+)
6 x for QX³13000-18000
4 x for QX³8000-10000
PV plug-in connector minus: Phoenix Contact PV-CM-S 2,5-6 (-)
6 x for QX³13000-18000
4 x for QX³8000-10000
Sealing caps for covering PV inputs that are not used
3 x for QX³13000-18000
2 x for QX³8000-10000
Sensor-/Remote: 1x signal plug Phoenix Contact SACC-MS-5SC SH SCO
Installations and operating instructions

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3.3 Unit identification
Every PV inverter has unambiguous device identification (serial number). You
should make a note of this data before installation, so you have it to hand for
ordering spare parts or if you have any questions. The type plate is affixed on the
right-hand side of the inverter.
Have the serial number ready to hand if you contact the Customer Service with a
query.
Type plate (example):
3.4 Functional description
The inverters of the product family QX³ are multi-string inverters.
Depending on the model selected, the inverter has two or rather three
independent inputs, each with its own MPP tracker (Maximum Power Point). This
allows the operation of various sub-generators also with different configurations
(string length, alignment, pitch) on one device. Even projects with partial shading
can be realised efficiently.
Thanks to its wide input voltage range and a high degree of flexibility in the
design of the strings this series efficiently covers all generator power levels from
around 5kW to 20 kW.
In order to save assembly and installation times all output and communication
interfaces are designed externally. The device does not need to be opened for
assembly and connection.
Communication lines, sensors as well as the functions of the feed-in management
are already integrated in the device. The device can be configured elegantly and
quickly using the integrated Ethernet interface. This makes an already integrated
and efficient system management possible.

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No other additional external communication units are necessary.
Current measured values and system parameters can be viewed at any time
on the graphical display. Intuitive user navigation allows you to access the
sub-menus quickly using the four navigation keys.
Please visit our website for the applicable standards of different
destination countries and the CE declaration of conformity.
3.4.1 Block circuit diagram
Function elements:
No. DESCRIPTION No. DESCRIPTION
1 PV input plug 6 RCD
2 PV circuit breaker 7 Power output circuit breaker
3 PV overvoltage protection 8 Mains overvoltage protection
4 Boost converter 9 Power output plug
5 Inverter

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Q3 ENERGIE Installation and operating instructions QX³ series 20/109
Version 1.0, Stand 27.04.2015
Installation and operating instructions
Q
X
³ series
3.5 PV module cable wiring
If several strings are connected in parallel, a fault occurring in one PV string, due
to a short circuit in a cell or a module for example, could lead to return current in
the string concerned.
Depending on the power, the inverters in the QX³- series have two or three
independent inputs, each controlled by their own MPP tracker.
Each input has a connection for maximum 2 strings. In this configuration the
return current cannot be greater than the maximum short circuit current of the
intact string in the event of a fault. As only the same strings may be connected in
parallel, there is no danger of the return current exceeding the current load
capacity in the cable wiring of the defective string with such a configuration.
So no additional string breaker is needed with this configuration and there is no
danger of the PV modules being further destroyed.
If several strings are connected in parallel, the sum of the short circuit currents of
the intact strings must be taken into account. This current must not exceed the
return load current rating indicated by the manufacturer of the PV module or the
current rating of the DC cables.
If this is not the case, it is absolutely necessary to use an external string breaker
in compliance with the PV module data sheet.