Solark O900-80V User manual

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Installation Manual
Copyright © 2023 Sol-Ark | Portable Solar LLC
EN
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Copyright © 2023 Sol-Ark | Portable Solar LLC
sol-ark.com
INSTALLATION MANUAL
Sol-Ark Optimization Rapid Shutdown System
EN
O900-80V
TX 12K-A
V2.0
July, 2023
Sol-Ark
Library
L I B R A R Y

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Installation Manual

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Installation Manual
Copyright © 2023 Sol-Ark | Portable Solar LLC
EN
READ THE INSTRUCTIONS COMPLETELY BEFORE
OPERATING THE EQUIPMENT
LEGAL WARNING
UNLESS AGREED TO IN WRITING, SOL-ARK:
(a) DOES NOT WARRANT THE ACCURACY, SUFFICIENCY OR SUITABILITY OF ANY TECHNICAL OR OTHER
INFORMATION PROVIDED IN ITS MANUALS OR OTHER DOCUMENTATION.
(b) ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY LOSS OR DAMAGES, WHETHER DIRECT, INDIRECT,
CONSEQUENTIAL, OR INCIDENTAL, ARISING OUT OF THE USE OF SUCH INFORMATION. USE OF SUCH
INFORMATION SHALL BE ENTIRELY AT THE USER'S RISK.
Sol-Ark is not responsible for system failure, damage or injury resulting from improper installation of its products.
Information in this manual is subject to change without notice.
This version is only focused on O900-80V optimizers and TX 12K-A transmitters.
Verify that the inverter is turned off before installing
the TX 12K-A.
To use the TX 12K-A transmitter in the Sol-Ark 12K-
2P-N a battery system is required.
Contact
Phone: (USA) 1-972-575-8875 ext. (2)
Email: [e-mail]
Website: WWW.SOL-ARK.COM
Verificar el tipo de red antes de
encender la unidad.
Encender y programar usando
únicamente baterías.

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Installation Manual
SAFETY INSTRUCTIONS
•Familiarize yourself with the functions and features by thoroughly reviewing the contents of this
manual.
•This manual provides detailed instructions on the product functions, installation process, and operation
of the O900-80V in conjunction with the PLC TX 12K-A transmitter. Prior to installation and use, please
ensure a comprehensive understanding of this product.
•Caution: Risk of electric shock! Avoid removing the cover, disassembling, or repairing internal
components of the equipment. In the event of equipment failure, contact Sol-Ark Technical Support.
Tampering or opening the product will void the warranty.
•Adhere to local codes and regulations when performing electrical installations.
•DO NOT disconnect the PV module from the O900-80V while it is under load.
•Take note that the body of the TX 12K-A transmitter board is susceptible to static shock. It is
recommended to wear an antistatic wrist strap before touching the body of the TX 12K-A board.
•Avoid installing the equipment in adverse weather conditions.
•Exercise caution as the O900-80V in operation contains a heat sink that can reach high temperatures.
To prevent burns, refrain from touching the area where the heat sink is located.
•For the latest product information and access to technical support documents, visit the official Sol-
Ark website at www.sol-ark.com and download the most recent version of the user manual.
•To comply with rapid shutdown requirements, it is necessary to install an emergency button connected
to pins 11 and 12 of the sensor pin-out board in the Sol-Ark 12K-2P-N. This will enable the
"EMERGENCY STOP" functionality.
To enhance safety during the installation and operation of the Sol-Ark O900-80V optimizer and TX 12K-A transmitter,
this document employs specific symbols to denote hazardous conditions and provide important safety instructions.
These symbols are included to mitigate the risk of electric shock and ensure a secure environment.
A dangerous situation that could result in injury or product damage.
Important operating notes.
The following symbols appear on the O900-80V optimizers.
Risk of electric shock.
Risk of burns.
PROPERLY QUALIFIED PERSONNEL
Operators/maintenance personnel must have relevant electrical knowledge, understand circuit principles, and have a
sense of safe operation.
In this manual, a "qualified person" refers to an individual who possesses knowledge and expertise in EMC, electrical
systems, and safety regulations. They are authorized to perform tasks such as energizing, grounding, and labeling
equipment, systems, and circuits in compliance with established safety protocols.

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Installation Manual
Copyright © 2023 Sol-Ark | Portable Solar LLC
EN
CONTENT
SYSTEM OVERVIEW .......................................................................................................................................................................... 6
1. PRODUCTS ..................................................................................................................................................................................7
O900-80V..................................................................................................................................................................................................7
TX 12K-A .................................................................................................................................................................................................... 8
2. INSTALLATION NOTES........................................................................................................................................................ 9
3. INSTALLING THE OPTIMIZER O900-80V............................................................................................................... 10
Installation procedure........................................................................................................................................................................ 10
4. INSTALLATION OF THE TRANSMITTER TX 12K-A.............................................................................................14
Parts and components .......................................................................................................................................................................14
Installation procedure.........................................................................................................................................................................15
5. COMISSIONING TESTS.......................................................................................................................................................21
To test system functionality with the TX 12K-A transmitter.............................................................................................21
6. TROUBLESHOOTING..........................................................................................................................................................22
TX 12K-A transmitter does not turn on:.....................................................................................................................................22
A string has no voltage:.....................................................................................................................................................................22
An O900-80V has no voltage:.......................................................................................................................................................22
Technical Support ...............................................................................................................................................................................22
7. TECHNICAL SPECIFICATIONS .....................................................................................................................................23
O900-80V Spec Sheet.....................................................................................................................................................................23
TX 12K-A Spec Sheet ........................................................................................................................................................................24
8. WARRANTY ..............................................................................................................................................................................25
Installation Map Card.........................................................................................................................................................................26

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Installation Manual
SYSTEM OVERVIEW
The Sol-Ark Rapid Shutdown System with Optimization incorporates the O900-80V optimizers and the TX 12K-A
transmitter, seamlessly integrated into the Sol-Ark 12K-2P-N inverters. This system is designed to provide a PV Rapid
Shutdown System (PVRSS) that is UL listed and compliant with NEC regulations for both new and existing PV systems.
By deactivating the TX 12K-A transmitter, the O900-80V receivers will reduce the voltage to 0.9 VDC per O900-80V
and bring the string voltage below 30 VDC.
Furthermore, in addition to facilitating Rapid PV Shutdown (PVRSS), the O900-80V optimizers offer the advantage of
power optimization for each PV module, serving as independent maximum power point trackers.
The integration of the TX 12K-A transmitter into the Sol-Ark 12K-2P-N inverter streamlines the installation of the PV
Rapid Shutdown System (PVRSS). With this integration, the strings equipped with O900-80V optimizers can be
directly connected to the PV inputs on the inverter, simplifying the overall installation process.
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
Figure (a) Basic configuration of O900-80V with TX 12K-A transmitters
TX 12K-A mounts inside the Sol-Ark 12K-2P-N inverter
Optimizer O900-80V Transmitter TX 12K-A

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EN
• Maximum production efficiency towards the
inverter in optimal or shady conditions
• SunSpec RSD certified for interoperability with
compatible inverters
• Complies with rapid shutdown listed in 2017 NEC
690.12 and 2020 NEC 690.12
1. PRODUCTS
O900-80V
Characteristics:
The Sol-Ark O900-80V incorporates advanced features including PV module Rapid Shutdown Device (RSD) and
Maximum Power Point Tracking (MPPT) energy optimization.
Each PV module can be connected to the O900-80V to ensure compliance with UL 1741 and NEC 690.12 requirements
for Rapid Photovoltaic Shutdown (RSD). The O900-80V compensates for shaded panels to maintain optimal power
output.
Upon receiving a "clear to operate" signal from the TX 12K-A or TX 15K-A transmitters, the O900-80V is activated,
enabling proper operation of the PV system.
Input terminals
Left (+) / Right (-)
Output terminals
Left (+) / Right (-)
Mounting brackets
Output wires
1.0m
Input wires
0.12m

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• Provides "permission to operate" signal for Rapid Shutdown
• SunSpec Rapid Shutdown Certification
• Complies with rapid shutdown listed in 2017 NEC 690.12 and 2020 NEC 690.12
• No need to add cores for PLC communication
TX 12K-A
Characteristics:
Sol-Ark TX 12K-A transmitters are part of the Rapid Shutdown Line, located inside Sol-Ark 12K-2P-N inverters.
When paired with the Sol-Ark O900-80V or any other SunSpec-RSD certified device, the TX 12K-A transmitters use
Power Line Communication (PLC) to provide the necessary "permission to operate" signal, ensuring compliance with
Rapid Shutdown requirements outlined in the 2017 and 2020 NEC 690.12 specifications.
These transmitters can be easily installed in existing, previously commissioned Sol-Ark 12K-2P-N inverters without the
need for additional toroids or external PLC equipment, as the transmitter is integrated into the MPPT board of the
inverter.

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When implementing parallel string connections, it is crucial to follow these guidelines:
Install O900-80V optimizers on all parallel strings if required.
Avoid creating parallel connections between strings that have the O900-80V optimizers and those that do not.
Place the Rapid Shutdown System label no more than 1m (3 feet) from the igniter or any emergency stop switch.
2. INSTALLATION NOTES
It is essential to adhere to local safety codes during the installation process:
•Please note that only qualified professionals should handle the installation or replacement of the TX 12K-A
transmitter.
•Before installing or using the TX 12K-A, carefully read and follow all instructions and warnings provided in the
technical documents and on the Sol-Ark 12K-2P-N inverter, as well as on the PV array.
•Keep in mind that installing this equipment carries the risk of electric shock.
•Avoid contact with any live component of the system, including the PV array, once it is connected to the grid.
•Prior to installing a TX 12K-A, ensure that both the PV module and inverter are disconnected from their power
sources.
sources.
Recommended Practices
•Ensure that the round-trip length (positive to negative) of a PV conductor does not exceed 300m (985ft).
•Maintain a minimum distance of 20cm (8in) between other conductors that utilize different PLC transmitters.
•The maximum open circuit voltage of the PV module should not surpass the specified maximum input voltage
of the O900-80V.
Once you have installed the TX 12K-A transmitter into the Sol-Ark 12K-2P-N inverter, it is essential to also connect a
NEC 690.12 (C) approved "emergency stop" RSS quick disconnect to pins 11 and 12 on the sensor connection board
of the Sol-Ark 12K-2P-N.
B B
11 12
Figure (2.1) Terminal board for sensors on the Sol-Ark
12K-2P-N
Figure (2.2) Rapid Shutdown System Label, NEC
690.12 (C)

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3. INSTALLING THE OPTIMIZER O900-80V
Installation procedure
STEP 1: Remove the barcode label.
Please remove the QR/barcode label and affix it to the "Installation Map Card" found at the back of this manual. For
convenient access to the most up-to-date product information, you can locate the Installation Map Card on our official
Sol-Ark website: www.sol-ark.com.
1. Each Sol-Ark O900-80V is equipped with a labeled barcode and unique serial number. Remove the label from
each optimizer and affix it to the designated spot on the installation map.
2. Clearly mark the MPPT where each string of the photovoltaic array is connected.
3. Ensure the registration of the O900-80V optimizers is completed on the www.mysol-ark.com portal for
monitoring purposes. Additionally, remember to register the equipment warranty on the www.sol-ark.com
website.
Please complete the Sol-Ark registration card, which includes system information and the installation map. If a larger
or more complex installation map is needed, you can use your own layout. The Installation Map Card is designed to
accommodate landscape-oriented labels.
To learn more about programming in the MySol-Ark app, please consult the Sol-Ark Rapid
Shutdown System with Optimization Programming and Monitoring Guide available at
www.sol-ark.com/resources.
Removable barcode
Figure (3.1) Format for the installation map used in the monitoring
programming process.
Figure (3.2) Views of the MySol-Ark App

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Installation Manual
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Ensure that the O900-80V is not positioned in direct sunlight, exposed to rain or snow, or placed between solar
modules.
Maintain a minimum gap of 1.5cm (0.75in) between the surface of the solar panel and the bottom of the O900-
80V to facilitate adequate airflow.
Before installing the O900-80V on the PV module frame, verify the dimensions to ensure proper space for natural
ventilation.
STEP 2: Secure each O900-80V to the solar panel frame.
Ensure that the O900-80V module is securely fastened to the solar panel frame. The heat sink side should face away
from the solar module, and make sure that the wires and connectors of the O900-80V do not come into contact with
the roof surface.






Figure (3.3) Mounting the O900-80V in the frame of a solar panel.
Figure (3.4) Side view of the O900-80V with the measurements of its
sides, not including the cables and connectors.

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STEP 3: Connect the shorter cables to the PV modules.
Connect the input terminals of each O900-80V module to the positive and negative wires respectively of each of the
solar panels.
STEP 4: Connect the longer wires to build a string.
To create a string, connect the longer set of output cables from the O900-80V to the neighboring optimizer.
1
+ -
+ -
2
To prevent damage to the O900-80V units, ensure that you connect the shorter input cables from the O900-80V
to the PV modules before connecting them to the remaining O900-80V units in the string series.
3

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Mounting the O900-80V on specialized solar modules
To mount the O900-80V on a frameless PV module, screws, and nuts (not included) can be used in addition to the
support clip. Prior to installation, ensure that the solar
panel has a hole for this purpose or the mounting rail.
Disconnection of the O900-80V
•Activate the rapid shutdown system by pressing
the designated emergency stop button (PVRSS).
•After activating the rapid shutdown, wait for 30
seconds before disconnecting the DC cables.
Ensure that the voltage is below 30V.
•Before disconnecting the O900-80V input wires
from each module's junction box, first disconnect
the individual O900-80V output wires from the string.
Figure (3.5) Mounting the O900-80V using screws and nuts for
mounting.
9mm hole on the O900-
80V
M8 x 30mm screw and lock nut diameter no
larger than 22mm
22 mm
Always assume that the O900-80V is energized and in the “ON” state of operation.

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If the TX 12K-A transmitter is already installed in your Sol-Ark 12K-2P-N inverter, please proceed to page 20 to
continue with the installation of the rapid shutdown label on the system.
4. INSTALLATION OF THE TRANSMITTER TX 12K-A
Parts and components
Component
Description
A
Transmitter TX 12K-A
B
2 x 10mm standoffs
C
Connector to 48VDC power supply
D
50mm standoff
E
Power cable for the TX 12K-A
B
C
D
E
A

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Installation procedure
The PLC TX 12K-A transmitter will be installed in the wiring area of the Sol-Ark 12K-2P-N inverter. By default, the
inverter comes with a pre-installed "CON board" that facilitates communication with other components of the inverter.
To install the TX 12K-A, the CON board is replaced with the new TX 12K-A board.
Once the TX 12K-A is installed, the Sol-Ark 12K-2P-N gains SunSpec capabilities, allowing it to send a "permission to
operate" signal to the O900-80V optimizer receivers through PLC. The system will operate normally until the signal is
disrupted.
STEP 1: Access the wiring area.
To access the wiring area, follow these steps:
•Open the lower door in the wiring area by releasing the two (2) metal latches located on the right side of the
equipment.
•Remove the six (6) screws securing the plastic cover, then take off the plastic cover to reveal the wiring area.
•Ensure that the DC power cables from the solar array are not connected to the MPPT terminals.
•Disconnect all sensors and communication cables from the CON board that houses the MPPT terminals.
Ensure that the Sol-Ark 12K-2P-N is powered off and all electrical connections are disconnected.
Verify that the PV switch for the solar panels is set to the OFF position.

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STEP 2: Remove the existing board.
Identify and disconnect the three (3) ribbon cables and the three (3) connectors positioned at the top of the
communications board.
To remove the communications board, follow these steps:
•Unscrew and remove the plastic separator located to the left of the MPPT terminals in the wiring area.
•Remove the three (3) standoffs of 50mm and 60mm positioned at the top and bottom of the communications
board.
•Take out the M5 screw located at the bottom left corner.

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Carefully unscrew and remove the four (4) M3 screws located at the top of the MPPT terminals (M1, M2, M3, and M4)
to detach the communications board. Afterward, remove the remaining screws on the communications board.
STEP 3: Place the TX 12K-A board in position.
After removing the communications board, follow these steps to install the TX 12K-A board with the integrated
transmitter:
•Install two (2) standoffs to securely hold the TX 12K-A board in place.
•Use four (4) M5 screws to fasten the TX 12K-A board in the inverter wiring area.
•Utilize the four (4) previously removed M3 screws (M1, M2, M3, and M4) to secure the connections of the
MPPTs connectors. Be careful not to exceed a maximum torque of 4 in-lbs.
Avoid using an electric screwdriver to remove
the four (4) M3 screws on the MPPTs.
Exceeding 4 in-lbs of torque on the bolts
should be avoided as it can cause damage
to the equipment.
Adjustment screws of
the MPPTs circuits.

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Install the two (2) 50mm standoffs on the top side of the TX 12K-A board. Additionally, use the extra 50mm standoff,
which is included in the installation pack, to secure the board on the bottom side.
STEP 4: Connect the power cable to the TX 12K-A
Once the TX 12K-A board is securely installed, follow these steps to remove the top cover of the inverter and access
the battery power bars:
•Remove the two (2) nuts located at the bottom of the cover.
•Unscrew and remove the six (6) screws at the ends of the cover.
50mm standoff.
To prevent damage to the connectors, slide the
top cover of the inverter to the side. This cover
houses three (3) ribbon cables responsible for
powering the LCD.

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The TX 12K-A board will activate once the battery terminals reach 48V, so it is important to ensure that the battery
breaker is in the ON position.
To make the power cable connection, follow these steps:
•Locate the two (2) screws positioned on the bar terminals at the top of the battery switch.
•Remove these screws and use them to secure the power cable of the TX 12K-A board.
•Connect the red wire to the positive terminal and the black wire to the negative terminal.
Connect the power cable to the "43-63V" input of the TX 12K-A board. Afterward, reattach the three (3) ribbon cables
and three (3) connectors to the TX 12K-A board.
Warning! Do not reverse the polarity, make sure the + and –terminals are
properly connected at both ends.
Terminal -
Terminal +
Connectors and ribbon
cables
Power cord
connectors

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STEP 5: Installing the top cover and rapid shutdown label.
After securely mounting the TX 12K-A board, reattach the top cover of the inverter and reconnect the DC PV wires.
Next, install the plastic cover in the wiring area of the Sol-Ark 12K-2P-N.
After installing the TX 12K-A transmitter, connect a rapid shutdown device to the Sol-Ark 12K-2P-N. Ensure easy
access to the emergency stop button and place the emergency stop label within 1m (3ft) of the device. Follow local
codes.