DISCOVER LYNK II User manual

1805-0038 REV A
(950-0025)
SOL-ARK USER
MANUAL

2
1.0 SAFETY 3
1.1 Audience 3
1.2 Warning, Caution, Notice and Note Messages 3
1.3 General Warnings 4
1.4 Personal Protective Equipment 5
2.0 Documentation 5
3.0 Overview 6
3.1 System Overview 6
3.2 Compatibility 7
3.3 Minimum Battery System Capacity 8
4.0 LYNK II CAN Hardware Termination and CAN Out PIN Configuration9
4.1 LYNK II CAN Termination 9
4.2 LYNK II CAN Out - RJ45 PIN Assignments for Sol-Ark Inverters 9
4.2.1 Sol-Ark Outdoor Inverter-Charger PIN Assignments 10
4.2.2 Sol-Ark Indoor (Legacy) Inverter-Charger PIN Assignments 11
5.0 Installing and Connecting LYNK II to the Sol-Ark Network 12
5.1 Networking Discover Lithium Batteries with LYNK II 12
5.2 Connecting LYNK II to the Sol-Ark Network 14
6.0 Enabling LYNK II to Communicate with Sol-Ark Devices 16
6.1 Setting the Sol-Ark Open-Loop Configuration 17
6.1.1 Open-Loop - Batt Setup > Batt 18
6.1.2 Open-Loop - Batt Setup > Charge 19
6.1.3 Open-Loop - Batt Setup > Discharge 21
6.2 Setting the LYNK II Communication Protocol for Sol-Ark 21
6.3 Setting the Sol-Ark Closed-Loop Configuration 22
6.3.1 Closed-Loop - Batt Setup > Batt 23
6.3.2 Closed-Loop - Batt Setup > Charge 25
6.3.3 Closed-Loop - Batt Setup > Discharge 26
6.3.4 Batt Setup > Smart Load 27

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1.0 SAFETY
1.1 Audience
Configuration, installation, service, and operating tasks should only be performed
by qualified personnel in consultation with local authorities having jurisdiction
and authorized dealers. Qualified personnel should have training, knowledge, and
experience in:
• Installing electrical equipment
• Applying applicable installation codes
• Analyzing and reducing hazards involved in performing electrical work
• Installing and configuring batteries
• Installing and configuring systems activated by relays
1.2 Warning, Caution, Notice and Note Messages
Messages in this manual are formatted according to this structure.
WARNING
Important information regarding hazardous conditions that may result in personal
injury or death.
CAUTION
Important information regarding hazardous conditions that may result in personal
injury.
NOTICE
Important information regarding conditions that may damage the equipment but not
personal injury.
NOTE
Ad hoc information concerning important procedures and battery features not
related to personal injury or equipment damage.

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1.3 General Warnings
WARNING
ELECTRIC SHOCK AND FIRE HAZARD
A lithium battery must be installed as specified. Do not disassemble or modify the
battery. If the battery case has been damaged, do not touch exposed contents.There
are no user-serviceable parts inside.
Failure to follow these instructions may result in death or serious injury.
WARNING
ELECTRIC SHOCK AND FIRE HAZARD
Do not lay tools or other metal parts on top of the battery or across the terminals.
Failure to follow these instructions may result in death or serious injury.
CAUTION
ELECTRIC SHOCK
Do not touch the energized surfaces of any electrical component in the battery
system. Before servicing the battery, follow all procedures to fully de-energize the
battery system and use safe handling procedures when handling the battery.
Failure to follow these instructions may result in injury.
Before using the battery and any power electronics, read all instructions and
cautionary markings on all components and appropriate sections of their
manuals.
• Use personal protective equipment when working with batteries.
• Do not dispose of the battery in fire.
• Promptly dispose or recycle used batteries following local regulations.
• Do not disassemble, open, crush, bend, deform, puncture or shred.
• Do not modify, re-manufacture, attempt to insert foreign objects into the
battery, immerse or expose to water or other liquids, or expose to fire
explosion or other hazards.
• Only use the battery for the system for which it is specified.
• Do not lift or carry the battery while in operation.
• When lifting a heavy battery, follow the appropriate standards.
• Only lift, move, or mount following local regulations.
• Take care when handling battery terminals and cabling.
• Only use the battery with a charging system that has been qualified for
the system.The use of an unqualified battery or charger may present a
risk of fire, explosion, leakage, or other hazards.
• Do not short circuit a battery or allow metallic conductive objects to
contact battery terminals.

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• Replace the battery only with another battery that has been qualified for
the system.The use of an unqualified battery may present a risk of fire,
explosion, leakage, or other hazards.
• Avoid dropping the device or battery. If the device or battery is dropped,
especially on a hard surface, and the user suspects damage, take it to a
service center for inspection.
1.4 Personal Protective Equipment
When handling or working near a battery:
• Use Personal Protective Equipment, including clothing, glasses, insulated
gloves, and boots.
• Do not wear rings, watches, bracelets, or necklaces.
2.0 Documentation
This Application Note provides information about the integration of LYNK
and AEbus network-enabled Discover Lithium Batteries using the LYNK II
Communication Gateway with Sol-Ark inverter-chargers.
Before installation and configuration, consult the relevant product documentation,
including Manuals, Application Notes, Installation and Configuration Guides.
Sol-Ark Documentation
Visit https://www.sol-ark.com/ for the most recent version of published
documents.
Discover Battery Documentation
Visit http://discoverbattery.com for the most recent version of published
documents, including Discover Lithium battery user manuals and the LYNK II
Communication Gateway User Manual (805-0033).

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3.0 Overview
This manual provides general settings and is not a comprehensive guide to the
programming and configuration of a specific installation. An installation may
have unique conditions or use cases that require modification or adaptations of
values. Installers must be capable of reviewing and adapting to the specifics of an
installation and its specific use case and optimizing settings where needed.
3.1 System Overview
The LYNK II Communication Gateway unlocks the full potential of a Discover
Lithium battery by enabling the internal Battery Management System (BMS) to
provide real-time data in a closed-loop configuration to other devices. In solar
applications, this allows the world’s best hybrid inverter-chargers and solar charge
controller systems to optimize their control over the charging process. LYNK II also
enables the remote monitoring of Discover Lithium battery SoC and data logging
of multiple sites using the data monitoring services offered by off-grid inverter
systems.
Discover Lithium batteries must be set up to work with power conversion and
monitoring devices in either an open-loop or closed-loop configuration.
Discover Lithium battery charge, and discharge settings in an open-loop
configuration are set up manually through the controller for the power conversion
device at the time of installation. An open-loop configuration is commonly
referred to as a ‘lead-acid drop-in’ replacement configuration.
In a closed-loop configuration, the BMS of the Discover Lithium battery sends
battery status over a network data connection with the power conversion device.
Power conversion devices use the Discover Lithium battery BMS data to finetune
the output of their charger and deliver other functional controls based on battery
voltage, temperature and percent State-of-Charge.

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BATTERY
LYNK
LYNK Bus / AEBus
DC Negative (-)
Power Electronics Communications
DC Positive (+) POWER ELECTRONICS
Figure 1. System Overview
3.2 Compatibility
LYNK II Communication Gateway is compatible with the following:
Discover Lithium Batteries
• AES LiFePO4: 44-24-2800, 44-48-3000, 42-48-6650
• HELIOS ESS: 46-24-1560, 46-48-1540
Sol-Ark Outdoor Inverters
• Sol-Ark 5K-P
• Sol-Ark 8K-P
• Sol-Ark 12K-P
• Sol-Ark 15K-P
Sol-Ark Indoor Inverters (Legacy)
• Sol-Ark 8K Hybrid
• Sol-Ark 12K Hybrid

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3.3 Minimum Battery System Capacity
Battery charge and discharge rates are managed automatically by the Discover
Lithium Battery and Sol-Ark device. Using large solar arrays with battery banks
that are too small can exceed the operating limits of the battery to charge and
possibly lead to the BMS triggering over-current protection. Battery capacity must
accept the maximum charge current of the system, or charging must be curtailed
below the operating limit of the installed batteries. Derive this value by adding
together the charge capacities of all inverter-chargers and solar charge controllers
in the system. Additionally, battery peak capacity must support the surge
requirements demanded by the load attached to the inverter. Match all inverter
peak power values with the sum of all battery peak battery current values.
Inverter Peak = (Inverter Surge Value) / (Inverter Efficiency) / (48V: Low Battery Cut-Off)
Model Inverter
Peak
Charger
Continous
Max3
42-48-6650
Minimum
per inverter4
44-48-3000
Minimum
per inverter5
46-48-1540
Minimum
per inverter6
Sol-Ark 5K-P 345 A DC1120 A DC 224
Sol-Ark 8K-P 345 A DC1185 A DC 246
Sol-Ark 12K-P 345 A DC1185 A DC 246
Sol-Ark 15K-P 518 A DC2275 A DC 3 5 10
1 Calculated based on Surge Power 16,000 VA (10s) and Efficiency 96.5% CEC, as published in
Sol-Ark User Manuals (2022-05).
2 Calculated based on Surge Power 24,000 VA (10s) and Efficiency 96.5% CEC, as published in
Sol-Ark User Manuals (2022-05).
3 As published in Sol-Ark User Manuals (2022-05).
4 Discover AES 42-48-6650 Battery, Peak Power: 300 A DC (3 seconds), 130 A DC Continous
Charge, as published in Discover AES User Manual (2022-05).
5 Discover AES 44-48-3000 Battery, Peak Power: 219 A DC (3 seconds), 57 A DC Continous Charge,
as published in Discover AES User Manual (2022-05).
6 Discover HELIOS 46-48-1540 Battery, Peak Power: 90 A DC (3 seconds), 30 A DC Continous
Charge, as published in Discover AES User Manual (2022-05).

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4.0 LYNK II CAN Hardware Termination and CAN Out PIN Configuration
4.1 LYNK II CAN Termination
NOTE
Disconnect power and all connections to LYNK II before attempting to configure
header jumpers.
Jumpers are used to configure termination for AEbus and LYNK Network, and the
CAN Out PIN assignments. Follow the LYNK II User Manual (805-0033) to learn
how to access and configure the header board with jumpers.
Detailed PIN configurations are included in the LYNK II User Manual but are
repeated here for convenience.
NOTE
LYNK II terminates the AEbus and LYNK Network by default. Do not remove the
termination jumper inside LYNK II unless instructed to do so by Discover Battery.
4.2 LYNK II CAN Out - RJ45 PIN Assignments for Sol-Ark Inverters
CAN signals (CAN H, CAN L, CAN GND) can be assigned to any PIN of the
RJ-45 connector by adjusting the jumpers on the header board.
NOTE
There are different ground pin (CAN GND) assignments for the Sol-Ark indoor
(Legacy) and outdoor inverter-chargers.

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8
7
6
5
4
3
2
1
JUMPER
CAN GND
CAN L
CAN H
H1
H2
H3
H4
7
8
7
8
7
8
3
4
4
3
4
3
4
1
2
2
1
2
1
2
5
6
5
6
5
6
5
9
10
9
10
9
10
LOW
HIGH
GROUND
9
10
7
86
31
Figure 2. Sol-Ark Outdoor CAN Pin Assignment
4.2.1 Sol-Ark Outdoor Inverter-Charger PIN Assignments
• 5K-P
• 8K-P
• 12K-P
• 15K-P
CAN Out Header Jumper RJ45 PIN
CAN L H2 - 5 - 7 5
CAN H H3 - 8 -10 4
CAN GND H2 - 2 - 4 6

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8
7
6
5
4
3
2
1
JUMPER
CAN GND
CAN L
CAN H
H1
H2
H3
H4
7
8
7
8
7
8
3
4
4
3
4
3
4
1
2
2
1
2
1
2
5
6
5
6
5
6
5
9
10
9
10
9
10
LOW
HIGH
GROUND
9
10
7
86
31
Figure 3. Sol-Ark Indoor (Legacy) CAN Pin Assignment
4.2.2 Sol-Ark Indoor (Legacy) Inverter-Charger PIN Assignments
• 8K Hybrid
• 12K Hybrid
CAN Out Header Jumper RJ45 PIN
CAN L H2 - 5 - 7 5
CAN H H3 - 8 - 10 4
CAN GND H4 - 2- 4 2

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5.0 Installing and Connecting LYNK II to the Sol-Ark Network
5.1 Networking Discover Lithium Batteries with LYNK II
NOTE
• Do not plug an AEbus RJ-45 network cable or terminator into the 10/100
Ethernet port of the LYNK II.
• Do not connect a CAT5 cable from the AEbus, LYNK or Ethernet ports of
the LYNK II to a WAN or MODEM port of a network router.
• Turn OFF all devices before connecting cables.
• Mixing the LYNK Network with other networks may result in equipment
malfunction and damage.
NOTE
Unless specified by Discover Battery, power electronics must not be connected
directly to the LYNK network or AEbus network.
Refer to the LYNK II Communication Gateway User Manual (850-0033) for detailed
instructions on network layouts, connections and terminations for compatible
Discover Lithium battery models. Some key reminders are repeated here for
convenience.
• At least one battery must be connected to the LYNK Port or AEbus Port on
LYNK II.
• A network of batteries will communicate as one battery.
• No more than one network of batteries may be connected to LYNK II.
• Network termination is required for the system's proper functioning -
note some batteries and devices may auto-terminate.
• LYNK II requires power from three possible sources (13-90 VDC power
supply, AEbus Port, or LYNK Port enabled Discover Lithium batteries or a
USB device).
• Discover Lithium batteries must be set to ON to supply power and
communicate data with LYNK II.

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Figure 4. AES
AES batteries are not internally terminated. LYNK II is internally terminated. When
using LYNK II with an AEbus network, ensure that a terminator is installed at the
end opposite LYNK II.
Figure 5. Helios
LYNK II and HELIOS ESS batteries are both internally terminated. When installing
LYNK II with Helios batteries, no external termination is required.

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5.2 Connecting LYNK II to the Sol-Ark Network
Before connecting LYNK II to the Sol-Ark network, ensure that all Sol-Ark devices
use COMM firmware version 1.4.3.0 or higher. Also, ensure that the CAN out pins
for LYNK II are configured correctly.
Insert one end of a CAT5 communication cable into the LYNK II CAN out port and
the other end into the correct CAN port of the Sol-Ark inverter charger.
NOTE
Ensure that all Sol-Ark inverters are using COMM firmware version 1.4.3.0 or
higher.
NOTE
There are different CAN port locations across Sol-Ark indoor (legacy) and
outdoor models.
L1L2
PV1+ PV1- PV2+ PV2-
Load Out AC In/Out Gen In
50A 50A 50A
PV Input
DC Input
Batt Disconnect
Neutral
Ground
L1L2 L1L2
CAN
RS485
SOL-ARK BUS
Figure 6. Indoor Sol-Ark 8K Hybrid (Legacy)

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L1L2
PV1+ PV1- PV2+ PV2-
Load Out AC In/Out Gen In
50A 50A 50A
PV Input
DC Input
Batt Disconnect
Neutral
Ground
L1L2 L1L2
CAN RS485
SOL-ARK BUS
Figure 7. Indoor Sol-Ark 12K Hybrid (Legacy)
PV1+ PV1- PV2+ PV2-
PV Input
DC Input
CAN
SOL-ARK BUS
Figure 8. Sol-Ark Outdoor 5K-P / 8K-P / 12K-P / 15K-P

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6.0 Enabling LYNK II to Communicate with Sol-Ark Devices
When properly connected to a closed-loop network and set to use the Sol-Ark
protocol, LYNK II will transmit real-time parameters from the Discover Lithium
battery, including voltage, current, temperature, state of charge and fault
conditions to a Sol-Ark Inverter. LYNK II will also transmit charge voltage and
current requests from the Discover Lithium battery to a Sol-Ark Inverter.
LYNK ACCESS software for 64-bit Windows 10 is required to configure LYNK II
settings for closed-loop CAN communication with Sol-Ark inverters.
Users and installers should be aware that if communication between the LYNK
II and inverter is lost for more than ten seconds, the inverter will safely stop
operation, so long as the BMS Lithium Batt and the BMS_Err_Stop parameters
are both enabled on the Sol-Ark inverter.The inverter will display an F58 BMS
Communication Fault if communication is lost.
The Sol-Ark inverter will check every five minutes and resume close-loop
operation if communication is reestablished. However, if communication cannot
be reestablished, the Sol-Ark inverter will need to be manually converted to
an open-loop configuration to resume operation.Therefore as a precautionary
measure, it is recommended to program the Sol-Ark inverter with the correct
voltage-based open-loop parameters before setting up the system to function in a
closed-loop configuration.
The Sol-Ark inverter will operate in an open-loop configuration using voltage-
based parameters if the BMS Lithium Batt parameter is disabled and the Use Batt
V Charged parameter is enabled.
NOTE
In a closed-loop configuration with the BMS Lithium Batt function enabled, the
BMS_Err_Stop parameter must be enabled. If the BMS_Err_Stop parameter function
is not enabled, the Sol-Ark inverter will continue to operate based on the last
communicated battery values. Depending on the mode of operation at the time
of communication fault and given enough time, the Sol-Ark inverter-charger will
eventually put the attached battery into an overcharged or fully discharged state.
When that occurs, either situation will trigger the Discover Lithium Battery BMS to
self-protect and disconnect the battery from the system.
NOTE
Neither Discover Lithium batteries nor LYNK II directly control Sol-Ark relay functions,
generator starting or other grid-interactive features.These functions are controlled
through the programming of the Sol-Ark inverter.

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6.1 Setting the Sol-Ark Open-Loop Configuration
As a precautionary measure, it is recommended to program the Sol-Ark inverter
with the correct voltage-based open-loop parameters before setting up closed-
loop parameters.
If necessary, first configure Sol-Ark inverters to operate in parallel by establishing
the inverter master/slave relationships and phase designations before setting the
parameters for battery operation. Configuring the master inverter will cascade
parameters and settings to the slave inverters.
The Open-loop Configuration Procedure
Refer to the latest Discover Battery documentation for battery values and the latest
Sol-Ark documentation for details on menu navigation and the setup procedure.
1. Set the Discover Lithium batteries to ON and set the inverter to ON.
2. Using the touch screen and keypad on the inverter, navigate from the SYSTEM
SETUP menu to the BATT SETUP menu screen.
3. Enable and disable parameters according to the instructions in the tables
below.
4. Set each variable parameter according to the instructions in the tables below
5. Touch the OK button to save all onscreen values - Ignore data displayed in
GREY boxes.
NOTE
Touch the Sol-Ark screen to:
• Navigate the Sol-Ark onsreen menus.
• Enable parameters.
• Activate the adjustment of values.
• Save all onscreen settings.
Values are adjusted using the keypad.
NOTE
Enable parameters with a CHECKMARK, and disable parameters by leaving them
unchecked.Touch a WHITE box onscreen to activate the adjustment of that value.
Selecting parameters that have been enabled and disabled alters values that are
available to be adjusted.
• A WHITE BOX indicates values that can be adjusted.
• A GREY BOX indicates values that cannot be adjusted, and any data
displayed should be ignored.

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NOTE
If necessary, configure Sol-Ark inverters to operate in parallel before setting the
parameters for battery operation.
6.1.1 Open-Loop - Batt Setup > Batt
Touch the BATT tab onscreen to start the programming sequence (Figure 9.).
• Touch the OK button to save all onscreen values - Ignore data displayed
in GREY boxes.
Ba Setup
Batt
Batt Capacity Use Batt V Charged
Charge Discharge Smart Load
Use Batt % Charged
No Battery
BMS Lithium Batt
Activate Battery
Max A Charge
Max A Discharge
TEMPCO
CANCEL OK
260 Ah
185 A
185A
-0mV/C/Cell 00
Figure 9. Open-Loop Battery Setup > Batt Menu (Two 130Ah AES Batteries with 12K-P)
Batt Setup > Batt
Batt Capacity
Set to the number of Discover Lithium batteries x Ah capacity
of each. For example, set to 260 Ah (2 x 130 Ah) for two AES
42-48-6650 batteries.
Max A Charge
For a single inverter: set to the lesser of the inverter’s max
charge capacity, or the quantity of attached batteries, multiplied
by the battery model’s specific max charge rating. For example,
a 12K-P inverter would be set to the lessor of the inverter’s max
charge rate of 185 A, or 260 A for two AES 42-48-6650 batteries
rated at 130 A max charge each.1
For a three-phase system: set to the lessor of the max charge
value for the master inverter, or the quantity of attached
batteries, multiplied by the battery model’s max charge rating,
divided by the number of inverters. For example, the 12k-P
master would be set to the lessor of the inverter’s max charge
rate of 185A, or 173 A for four AES 42-48-6650 batteries rated at
130 A max charge each (520 A divided by three inverters).

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Max A Discharge
For a single inverter: set to the lesser of the inverter’s max
discharge capacity, or the quantity of attached batteries,
multiplied by the battery model’s specific max discharge rating.
For example, a 12k-P inverter would be set to the lessor of the
inverter’s max discharge rate of 185 A, or 260 A for two AES 42-
48-6650 batteries rated at 130 A max charge each.1
For a three-phase system: set to the lessor of the max discharge
value for the master inverter, or the quantity of attached
batteries, multiplied by the battery model’s max charge rating,
divided by the number of inverters. For example, the master
12k-P would be set to the lessor of the inverter’s max charge
rate of 185 A, or 173 A for a battery bank of four AES 42-48-6650
batteries rated at 130A Max Charge each (520 A divided by
three inverters).
TEMPCO Set to 0 mv/C/Cell.2
Use Batt V Charged Enable
Use Batt % Charged Disable
No Battery Disable
BMS Lithium Batt Disable (Displays 00 value)3
Activate Battery Enable
1 The recommended value for Max A Charge is 75% of the rated maximum charge current for the
battery.
2 Discover Lithium batteries do not require temperature compensation. SettingTEMPCP to
O mv/C/Cell will disable inverter-charger controlled temperature compensation.
3 Setting the BMS Lithium Batt parameter to Disable confirms open-loop operation. Setting the
parameter to Enable confirms closed-loop operation.
The values and parameters used are for an assumed operating temperature of 25 deg C.
6.1.2 Open-Loop - Batt Setup > Charge
Touch the CHARGE tab onscreen to start the programming sequence (Figure 10).
• Touch the OK button to save all onscreen values - Ignore data displayed
in GREY boxes.

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Ba Setup
StartV
Batt Charge Discharge Smart Load
Float V
Start%
A
Gen Charge
Gen Force
Generator Exercise Cycle Day & Time>>
Grid Charge
CANCEL OK
Absorbtion V
Equalization V
48.0V 48.0V
10% 10%
185 A 185 A
53.6V
55.2V
55.2V
0.0 hours30 Days
Mon 08 :00 20min
Figure 10. Open-Loop Battery Setup > Charge (Two 130Ah AES Batteries with 12K-P)
Batt Setup > Charge
Gen Charge
Enable if charging from a generator is desired.1
Note:The Gen Input Breaker must be connected to the output
of an AC generator for this work.
Grid Charge
Enable if charging from the grid is desired.2
Note:The Grid Input Breaker must be connected to input from
the grid for this to work.
StartV Set the value to the desired battery voltage that will trigger
battery charging.The absolute minimum is 48 V.
Start% Unavailable (Grey) in an open-loop configuration.
ASet to the same Amp value that was used for Max A Charge.3
Float V Set to 53.6 V
Absorption V Set to 55.2 V4
Equalization V
55.2 V5
30 days
0.0 hours5
Gen Exercise Cycle
Day & Cycle Refer to Solar-Ark documentation.
Gen Force Refer to Solar-Ark documentation.
1Left column options are for Gen Charge AutoStart values (Reference Sol-Ark
documentation for more details on the generator AutoStart function.
2Right Column options are for Grid Charge values.
3If need be, this value is used to curtail the maximum current output of the charger.
4Absorption will stop at 2% of the set capacity of the battery bank and move to the
float value.
5Lithium batteries MUST not be equalized. Using a value of 55.2 for Equalization V
and zero for Hours ensures that the batteries will not be equalized.
The values and parameters used are for an operating temperature of 25 deg C.