LG RESU FLEX Operating and maintenance instructions

Quick Installation Manual for RESU FLEX
Full installation
LG Energy Solution strongly advises users to exercise due care in following LG Energy
Solution’s product installation manual. Warranty claims are invalid if damage is caused
by human error in a manner inconsistent with the installation manual’s instructions.
Version 1.0

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3
About this manual
This manual intends to illustrate the key points when installing LG Energy Solution's RESU Flex battery.
Make sure to read the Full Installation manual before installing RESU Flex battery. You can nd the full installation manual
under www.lgessbattery.com or using the QR-code in the front page of this manual.
If you are uncertain about any of the requirements, recommendations, or safety procedures described in this manual,
contact LG Energy Solution immediately for advice and clarication. The information included in this manual is accurate
at the time of publication. However, the product specications are subject to change without prior notice. In addition,
the illustrations in this manual are meant to help explain system conguration concepts and installation instructions. The
illustrated items may dier from the actual items at the installation location.
Contents
1. Safety
1.1 Safety Instructions
1.1.1 Battery Handling Guide
2. Installation
2.1 Installation location
2.2 Standing Installation
2.2.1 Clearance
2.2.2 Installation and Cable Connection of BMA and BPU for
stand type
2.2.3 Finalizing Installation
2.3 Wall-mounting Installation
2.3.1 Clearance
2.3.2 Mounting Brackets Installation
2.3.3 Installation and Cable Connection of BMA and BPU for
Wall type
2.3.4 Finalizing Installation
3. Connection to the Inverter
3.1 Prepare for Connection
3.2 Communication line connection
3.3 Power line connection
4. Commissioning
4.1 Battery setting from RESU Monitor App
4.2 LED Indicator
4.3 Powering On the Battery Pack
4.4 Shutting O the Battery Pack
5. Troubleshooting
5.1 Troubleshooting Overview
5.1.1 Post-Installation Checklist
5.1.2 Troubleshooting Guidelines
5.1.3 Contact Information

4
1. Safety
1.1 Safety Instructions
For safety reasons, installers are responsible for familiarizing themselves
with the contents of this document and all warnings before performing any
installation and service.
1.1.1 Battery Handling Guide
• Do not expose the battery to an open ame.
• Do not place the product near to highly ammable materials.
• Do not expose or place near water sources such as downspouts or sprinklers.
• Do not store or install the product in direct sunlight.
• Do not install the product in an airtight enclosure or in an area without
ventilation.
• Do not install the product in living area of dwelling units or in sleeping
units Other than within storage and utility spaces.
• Store in a cool and dry place. (Do not store in greenhouses or storage areas
for hay, straw, cha, animal feed, fertilizer, vegetables, or fruit products.)
• Store the product on a at, level surface.
• Store the product out of reach of children and animals.
• Store the product in clean environment, free of dust, dirt and debris.
• Do not allow unqualied personnel to disconnect, disassemble or repair the
product. Product handing, service and installation must be carried out by
qualied and competent personnel.
• Do not damage the Product by dropping, deforming, impacting, cutting or
penetrating with a sharp object. Doing so may cause a re or leakage of
electrolytes.
• Do not touch the product if liquid spills on it. There is a risk of electric
shock. Handle the battery wearing insulated gloves.
• Do not step on the product or the product՚s packaging since the product may
be damaged.
• Do not place any foreign objects on top of the Battery Pack and on the
cooling n.
• Do not put the battery pack upside down on the ground.
• Do not connect the power cables at terminal the block in the opposite
direction.
• Do not charge or discharge a damaged battery.
• If the Product is installed in a garage or carport, ensure there is adequate
clearance from vehicles.
• The battery pack has been certied IP55 and can be installed indoors as well
as outdoors. However, if installed outdoors, do not allow the battery pack to
be exposed to direct sunlight or water sources, as they may cause:
- Power limitation phenomena in the battery (with a resulting decrease in energy
production by the system).
- Premature wear of the electrical/electromechanical and mechanical components.
- Reduction in performance, performance warranty and possible damage of the
battery
• Only use the product with a LGES-authorized inverter.
For a list of compatible inverters, go to :
https://www.lgessbattery.com/us (in case of North America)
https://www.lgessbattery.com/au (in case of Australia)
https://www.lgessbattery.com/eu (in case of all EU-countries in general)
https://www.lgessbattery.com/de (in case of Germany)
https://www.lgessbattery.com/it (in case of Italy)
https://www.lgessbattery.com/es (in case of Spain)
• Do not connect any AC conductors or photovoltaic conductors directly to
the battery pack. These are only to be connected to the inverter.
2. Installation
RESU FLEX can be installed in a Standing or Wall-mounting form.
2.1 Installation location
Make sure that the installation location meets the following conditions:
• The building is designed to withstand earthquakes.
• The location is far away from the sea, to avoid salt water and humidity.
• The oor is at and level.
• There are no ammable or explosive materials nearby.
• The optimal ambient temperature is between 20 and 30°C.
• The temperature and humidity stays at a constant level.
• There is minimal dust and dirt in the area.
• There are no corrosive gases present, including ammonia and acid vapor.
The Resu Battery pack is rated at IP55 and thus can be installed outdoors as well
as indoors. However. if installed outdoors, do not allow the battery pack to be
exposed to direct sunligh and moisture.
NOTE
If the ambient temperature is outside the operating temperature range (-10℃ ~
50℃), the battery pack will stop operation to protect itself. The optimal ambient
temperature range for the battery pack is between 20℃ and 30℃.
Frequent exposure to harsh temperatures may deteriorate the performance and
life of the battery pack.
NOTE
2.2 Standing Installation
2.2.1 Clearance
At least
300mm
At least
500mm
2.2.2 Installation and Cable Connection of BMA and
BPU for stand type
1. Assemble the Basic Standing Bracket to the BMA.
M6 Bolt
M6 bolt (a torque of 5N·m)
Basic standing bracket
Basic

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When adding Optional Standing Bracket
Bolt 8ea(a torque of 5N·m)
Basic Standing Bracket
Pack Standing Bracket
*Optional Standing Bracket is for additional purchase and is not included in basic package.
2. Fix the rst BMA to the wall.
1) Assemble Fixing Brackets on the rst BMA.
Fixing Bracket
M6 Bolt
(a torque of 5N·m)
2) Move the rst BMA to the wall and mark the drill point for the Fixing
Brackets. Drill holes at the marked points and x the BMA to the wall.
Wall
Recommended fastener diameter/length : 10mm/40mm
3. Connect the Terminal Resistor, End Connector and Connector Cover to the
Bottom Terminal Block inside the BMA.
* Terminal Resistor, End Connector and Connector Cover are included in the BPU package.
Wall
M6 Bolt
End Connector
Connector Cover
Terminal Resistor
4. Connect the Inter Cable to the Top Terminal Block inside the BMA.
Wall
After connection,
fasten the bolts.
Connector color : Black
Communication
Power
Inter Cable
M6 Bolt
5. Tidy up the cable by inserting in the attachable path inside the BMA and
fasten the cable using the Tie hole.
Tie hole
Be careful not to damage the cable.
CAUTION
6. Install the second BMA in front of the rst BMA.
Wall
Wall
Corner Bracket
M6 Bolt
(a torque of 5N·m)
* The Corner Bracket assembled on the
first and second BMA should divide the
cables of the Wire Harness in to two part,
with each part having two cable lines.
When the second BMA is installed in front of the rst BMA, make sure that the
Inter Cable does not interfere between the BMAs.
CAUTION
When adding Optional Standing Bracket
Wall
Corner Bracket
7. Apply the Wire Harness along the attachable path as the below image and
connect it to the Bottom Terminal Block of the second BMA.
Tie hole
After connection,
fasten the bolts.
Connector color : Green
Power
M6 Bolt
Communication
Inter Cable

6
8. If third and/or forth BMAs are to be installed, repeat the steps from No.4
to No.7.
9. Apply the BPU in front of the last BMA, and connect the last BMA with
the BPU with Wire Harness by repeating the steps from No.4 to No.7.
Remove LED Cover and Design Cover of the BPU
1) Slide and remove the LED Cover of the BPU.
2) Unscrew the 4 bolts on the right side of the BPU as illustrated below.
3) Slide and remove the Design Cover of the BPU.
LED Cover
Design Cover
10. Refer to the dimension information by dierent number of BMAs, as
illustrated below.
Wall
BMA
BPU
Basic : 670.2mm
Option : 869.3mm
665.2mm
BMA2ea+BPU1ea
526.7mm
BMA3ea+BPU1ea
675.1mm
BMA4ea+BPU1ea
823.5mm
2.2.3 Finalizing Installation
The following steps shall be executed after the connection to the inverter and
commissioning is completed.
1. Reassemble the BPU's Design Cover and LED Cover.
1) Reassemble the Design Cover of the BPU by sliding it backwards.
2) Fasten the 4 bolts that were removed.
3) Reassemble the LED Cover of the BPU by sliding it backwards.
LED CoverDesign Cover
4. After the two covers of the BPU are replaced, assemble the Corner Covers
on each corner of the BMA and BPU to protect the cables.
Corner Cover
BMA
Design Cover
Corner Cover
Push the front edge of the Corner Cover
into the Design Cover
(or the Corner Cover applied in front)
Assemble
direction
BPU
Wall
In case of option
1) Apply the Wire Harness along the attachable path as the below
image and connect it to the Bottom Terminal Block of the second
BMA.
Wall
Direction
Option Standing Bracket Cover
Basic Standing
Bracket
Option Standing
Bracket Cover
2) Assemble Double Corner Cover into Optional Standing Bracket.
Double
corner cover
Option Standing
Bracket Cover
Wall
2.3 Wall-mounting Installation
For Wall-mounting installation, the BMA and BPU can be placed in various
layouts. Please select a layout for installation in advance and check for the
mounting and cabling order in the following 'Wall-mounting Layout' section.
2.3.1 Clearance
At least
300mm
At least
150mm
At least
500mm
2.3.2 Mounting Brackets Installation
1. Select a layout for the Wall-mounting Installation.
2. Decide the position of Mounting Bracket.
3. Drill holes in the wall for the anchor bolts. Drill holes in the wall for the
anchor bolts (minimal size of M8 0.3in is required). The drilling depth
should be at least 50mm.

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Wall mounting layout

8
4. Drive and pre-tighten the anchor bolts into the holes in the wall through
the screw holes on the Wall Mounting Bracket.
Depending on the condition of the
wall, bolt at least 8 points Information of hole position (mm)
5. Connect the Brackets with each other using bolts, from left to right and
from top to bottom direction. After connecting the Mounting Brackets,
check the balance and fully fasten the bolts to the wall.
Wall
Fasten the Mounting Brackets with
M6 bolts.
After check the balance and fully
fasten the bolts to the wall
2.3.3 Installation and Cable Connection of BMA and
BPU for Wall type
1. Assemble the Pack Mounting Bracket to the BMA.
Pack Mounting Bracket
2. Assemble the BMA to the Wall Mounting Bracket using the handle.
* Depending on the BMA location on the wall, the position of the handle on the BMA varies.
* The Design Cover of the BPU should be removed before installing the BPU to the Mounting
Bracket.
Wall
3. In the marked part, assemble the corner bracket and double corner cover
rst and then install the next BMA.
Double Corner Cover
Corner
Bracket
Double Corner Cover Corner Bracket
4. Once all the BMAs and BPU are installed, assemble the Corner Brackets
on all corners of the BMA and BPU.
(A : Corner Bracket 1ea, B : Corner Bracket 2ea)
5. Once all the BMAs and BPU are installed, start the cable wiring between
the BMAs and BPU. Make sure that the cabling order is the same as the
installation order of the BMA as the Wall-mounting Layout and the BPU is
always the last one in the order.
6. Connect the Terminal Resistor, End Connector and Connector Cover to the
Bottom Terminal Block of the rst BMA in order of the 'Wall-mounting
layout'
M6 Bolt
End Connector
Connector Cover
Terminal Resistor

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7. Connect the Inter Cables between the BMAs and BPU in order.
1) Top Terminal Block
M6 Bolt
Communication
After connection, fasten the bolts
Connector: Black
Power
Inter Cable
2) Bottom Terminal Block
Communication
Power
Inter Cable
M6 Bolt
After connection, fasten the bolts
Connector: Green
8. Tidy up the Inter Cable by inserting it into the attachable path inside the
BMA and fasten the cable using the Tie hole.
9. Only use the cable path from the three following illustration.
1) Left to right connection
2) Right to left connection
3) Bottom to top connection
Tie hole
Cable Tie
2.3.4 Finalizing Installation
The following steps shall be executed after the connection to the inverter and
commissioning is completed.
1. Attached Design Cover to all BMAs by sliding it from right to left.
2. Replace the Design Cover of the BPU by sliding it from right to left.
3. Fasten the 4 bolts that were removed.
4. Replace the LED Cover of the BPU by sliding it backwards.
LED CoverDesign Cover
<BMA cover> <BPU cover>
5. Assemble all Single Corner Cover and Double Corner Cover.
(A : Single Corner Cover, B: Double Corner Cover)
Single corner cover
Double corner cover
Corner Bracket
A
B
Single corner cover
Double corner cover
Corner Bracket
A
B
3. Connection to the Inverter
Make sure that inverter is turned o before connecting the BPU to the inverter.
WARNING
3.1 Prepare for Connection
Terminal Cover
1. Disassemble the Terminal
Cover of the BPU by removing
the bolts on 8 points.
Hole’s Cap
2. Remove a Cap from the hole
on top right side of the BPU.
* One of the Cap is for the BPU parallel
connnection

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Cable Gland
3-1. Loose a Cable Gland
* One of the Cable Glands is for the BPU
parallel connection
* Assemble the adapter according to
regional regulations.
3-2. Insert the cables through the
Cable Gland
3.2 Communication line connection
1. Find the Communication terminal block.
Connect to Communication line according to the communication type. (C
AN or RS485)
Communication
terminal block
Inverter CAN Hi
Inverter CAN Lo
15
14
Inverter RS485 A+
Inverter RS485 B-
12
11
Inverter ENABLE 12V(+)
4
Inverter ENABLE GND(-)
1
Recommended Communication Cable
Ferrules terminal
Comm. cable
10mm
1) Max. cable length : < 30m(98ft)
2) Conductor cross section :
0.3~0.5mm
2
* Use a multi conductor cable(Core 4 or 5)
with a outer diameter of 5.5 ~ 6.5mm.
3) Use ferrule terminal for the
communication cable.
Pin-map of the Communication Terminal Block
No, Color Pin map
1
GRAY
ENABLE GND(-)
2LTE/WAKE GND(-)
3
BLACK
Input 12V (BPU EOL)
4Enable 12V (In)
5
RED
WAKE OUT
6 WAKE IN
7 INTERNAL CAN GND
8 INTERNAL CAN Lo
9 INTERNAL CAN Hi
10
BLUE
LTE 12V(+)
11 INVERTER RS485 B-
12 INVERTER RS485 A+
13
GREEN
INVERTER COMMS GND
14 INVERTER CAN Lo
15 INVERTER CAN Hi
2. How to connect Ethernet cable.
Terminal for
Ethernet cable
1) Insert the cable through the
Gland and connect it to the
Terminal for Ethernet cable.
*: Same as common ETHERNET pin
map
3.3 Power line connection
Pay attention to polarity. Reverse polarity connection causes severe damage to
the BMA.
NOTE
1. Find the Power terminal block inside the terminal hole Connect to Power
line as below.
Screw using flat-head type
(6mm, 6.9±0.5Nm)
* Reserved Port for Parallel-connected
Terminal Block
PE
PE
Recommended Power Cable
1) Max. cable length : < 30m(98ft)
2) Conductor cross section : 6mm
2
3) Use ferrule terminal for the power cable.
3.4 End of Connection
1. Fasten the Cable Gland
Cable Gland
2. Seal the Cable Gland with sealant.
* IP55 is not met when only outer hole is sealed. Make sure that inter hole of the Cable Gland
is sealed properly.

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3. Mark the Model No. depending on the Battery Conguration.
Battery Conguration
□ RESU FLEX 8.6 □ RESU FLEX 12.9 □ RESU FLEX 17.2
BPU 1 + BMA2 BPU 1 + BMA3 BPU 1 + BMA4
RESU FLEX 8.6
RESU FLEX 12.9
RESU FLEX 17.2
4. Commissioning
For the battery commissioning you need for installer account
If you don’t have your account, please visit LG ESS Battery website and
make an account.
https://www.lgessbattery.com/us (in case of North America)
https://www.lgessbattery.com/au (in case of Australia)
https://www.lgessbattery.com/eu (in case of all EU-countries in general)
https://www.lgessbattery.com/de (in case of Germany)
https://www.lgessbattery.com/it (in case of Italy)
https://www.lgessbattery.com/es (in case of Spain)
4.1 Battery setting from RESU Monitor App
RESU FLEX should be set with the RESU Monitor App.
Please download RESU Monitor App and follow the instructions and proceed
with the battery setting.
Search for “LG RESU Monitor” in App Store(iOS) or Play Store(Android) to
download the RESU Monitor App.
4.2 LED Indicator
There are four LED indicators on the front of the battery packs to show its
operating status.
- Power: This indicator stays on while the battery pack is supplied with
power for operation.
- Charging: This stays on while the battery pack is charging.
- Discharging: This stays on while the battery pack is discharging.
- Fault: This comes on when the battery pack is in a warning state.
POWER
CHARGING
DISCHARGING
FAULT
The LED indicators on the front of the BPU shows dierent state of the
battery before setup is completed:
During initial battery setup
Initial setting
not performed Initial setup error 1* Initial setup error 2**
Initial setup error
3***
* Initial setup error 1: The number of BMA connected to BPU is higher than number of
BMA set within the RESU Monitor App.
** Initial setup error 2: The number of BMA connected to BPU is less than the number of
BMA set within the RESU Monitor App.
*** Initial setup error 3: The SW versions of the BMAs are different.
The LED indicators on the front of the BPU shows dierent operation state
of the battery:
Battery Operation
STANDBY CHARGE DISCHARGE POWER SAVING
Battery fault status.
Battery Fault
FAULT1 FAULT2
4.3 Powering On the Battery Pack
There are four LED indicators on the front of the battery packs to show its
operating status.
1. Open circuit breaker cover of BPU.
2. Ensure the circuit breaker switch is in the OFF position.
3. Turn on the circuit breaker.
4. Seconds after the circuit breaker switch is ON, four (4) LED indicators
will light up and blink every second. (Battery Setting Required)
4.1 Ensure the LED power indicator is ON to conrm that the battery pack
has successfully initialized. Go to step
4.2 If the LEDs are in a state other than 4.1, it means initialization was not
successful. Go to Troubleshooting.
5. Close the front cover.
6. Turn on the inverter.
4.4ShuttingOtheBatteryPack
Shut o the battery pack through the following steps:
1. Turn o the inverter.
2. Open the front cover.
3. Turn o the battery pack by moving the circuit breaker switch to the OFF

12
position.
4. Make sure that every LED indicator on the battery pack is OFF. (After
10 seconds, the LED lights will turn o and the battery will shut down
completely.)
5. Close the front cover.
5. Troubleshooting
5.1 Troubleshooting Overview
Check the LED indicators on the front to determine the state of the battery
pack. A fault state is triggered when certain conditions like voltage or
temperature are beyond design limitations. The battery pack’s BMS
periodically reports its operating state to the inverter.
When the battery pack falls outside of prescribed limits, it enters a fault state.
When a fault is reported, the inverter immediately terminates operation.
Use the monitoring software on the inverter to identify what caused the fault
state. The possible warning messages are as follows:
• Battery Overvoltage
• Battery Undervoltage
• Battery Over Temperature
• Battery Under Temperature
• Battery Discharge Overcurrent
• Battery Charge Overcurrent
• Battery Overcharge Power Limit
• Battery Overdischarge Power Limit
• BMS Internal Error
• External Communication Error
• Internal Communication Error
• Battery Cell Deviation Voltage
• Battery Pack Undervoltage
• Battery Urgent Undervoltage
The fault state is cleared when the battery pack resumes normal operation. If
battery pack is not working correctly and the issue persists, contact a qualied
sta, Installer or LG Energy Solution regional contact service point.
For serious warnings, if no proper corrective action is taken by the inverter, the
battery pack’s circuit breaker will automatically trip to protect itself.
NOTE
If the battery pack or the inverter indicates FAULT or fails to operate, contact LG
Energy Solution regional contact point or your distributor immediately.
CAUTION
5.1.1 Post-Installation Checklist
1. Visually check if the wiring matches the installation manual.
(Refer to the chapter. 4)
2. The circuit breaker is ON.
3. The battery LED power indicator is ON.
4. The inverter power is ON.
5. The inverter has the latest rmware installed.
6. The inverter recognizes the battery.
7. The battery is operational after installation.
7-1. The AC grid is connected.
7-2. The meter is installed.
7-3. Government approval is complete.
8. If any item in #7 is checked as no or if the inverter Needs to be
turned o, turn o the circuit Breaker.
5.1.2 Troubleshooting Guidelines
If the battery LED power indicator is OFF
1. Turn o the circuit breaker.
2. Turn o the inverter. Verify there is no power at the battery connection.
3. Unplug all the wires and reconnect. Check that the wiring on the battery
has been done correctly. Refer to Section 3 Battery-inverter Connection
4. Turn on the circuit breaker.
5. Turn on the inverter.
6. If the LED power indicator is still OFF, turn o the circuit breaker.
7. Disconnect the power cable connector.
8. Contact LG Energy Solution regional contact point.
1) Contact the inverter manufacturer.
2) Refer to the inverter installation manual or troubleshooting guidelines.
3) Refer to the Installation manual (3.Battery-inverter connection) for the
location of the battery. and the Circuit Breaker.
If the LED power indicator is ON, but the battery is not charging or
discharging
1. Update both the inverter and battery rmware versions. Refer to the
inverter’s troubleshooting guide for instructions.
2. Check the inverter’s battery settings. Refer to the inverter’s troubleshooting
guide for battery setup instructions.
3. If the battery is recognized, inverter setup has been completed successfully.
4. If the issue persists:
4-1. Turn o the circuit breaker.
4-2. Turn o the inverter. Verify there is no power at the battery
connection.
4-3. Unplug all wires and reconnect. Check that the wiring on the battery
has been done correctly. Refer to Section.2. and 3.
4-4. Turn on the circuit breaker.
5. If the battery setup is correct, but the battery is still non-operational, turn
o the circuit breaker
6. Contact LG Energy Solution regional service contact point.
If the LED fault indicator is ON
1. Check if the inverter recognizes the battery. Refer to the inverter’s
troubleshooting guide for battery setup instructions.
2. If the inverter is connected to the internet, collect the log  les from the
inverter company.
2-1. Send the fault ID to LG Energy Solution regional contact point.
Yes No

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13
2-2. Turn o the circuit breaker.
2-3. Wait further instruction from LG Energy Solution.
3. If the inverter is not connected to the internet, check the inverter LCD to
read the battery’s fault ID. Refer to the inverter’s troubleshooting guide for
instructions.
3-1. Send the fault ID to LG Energy Solution regional contact point.
3-2. Turn o the circuit breaker.
3-3. Wait further instruction from LG Energy Solution.
5.1.3 Contact Information
Damaged batteries are dangerous and must be handled with extreme caution.
They are not t for use and may pose a danger to people or property. If the
battery pack seems to be damaged, contact LG Energy Solution regional
contact point or your distributor. Use the contacts below for technical
assistance. These phone numbers are available only during business hours on
weekdays.
Service Contacts
HQ (KOR) /
Other Regions
Address
29, Gwahaksaneop-3-ro, Oksan-
myeon, Heungdeok-gu, Cheongju-si ,
Chungcbeongbuk-do, South Korea
E-mail [email protected]
US
Address 19481 San Jose Ave City of Industry, CA
91748, U.S.A
Telephone [phone]
E-mail [email protected]
Europe
Address E-Service Haberkorn GmbH, Stolberger Str. 25,
06493 Harzgerode, Germany
Telephone [phone]
E-mail [email protected]
Australia
Address Unit 12, 35 Duolop Road, Mulgrave VIC 3170,
Australia
Telephone [phone]
E-mail [email protected]

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LG Twin Towers, 128, Yeoui-daero, Yeongdeungpo-gu, Seoul 07336, Republic of Korea
https://www.lghomebattery.com http://www.lgensol.com
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