Lithtech TW6000-PRO User manual

I
Energy Storage System
TW6000-PRO
Manual

Manual for Energy Storage SystemTW6000(6000P)
II
Legal Notices
The copyright of this product belongs to Shenzhen Lithtech Energy Co., Ltd. Without the
written permission of the copyright party, no unit or individual may extract, reproduce or
translate in any way.
Infringement must be investigated.
This product complies with the design requirements for environmental protection and
personal safety. The storage, use and disposal of the product should be in accordance
with the requirements of the product manual, relevant contract or corresponding national
laws and regulations.
When there is a product update or a technical change, you can inquire related
information through the technical support website of Shenzhen Lithtech Energy Co., Ltd.
Website:http://www.ltc-energy.com/
If this product is improved or technically changed without notice.
Version
Date
Content
1.0
2021.02.25
Initial Release

Manual for Energy Storage SystemTW6000(6000P)
III
Precautions
Warning
1.It is strictly forbidden to place the battery in water or fire, so as to avoid explosion or
other dangers, endangering personal safety.
2. Please connect the cables properly during installation, do not reverse the positive and
negative poles; do not directly connect the positive and negative poles of the battery with
a conductor (such as a wire) to avoid short-circuiting the battery.
3.Do not strike the battery with a needle, hit it with a hammer, step on it hard, or
otherwise.
4.During use, when the system needs to be moved or rewired, the power must be
completely cut off and the system must be completely shut down, otherwise there will be
danger of electric shock.
5.In case of fire, please use dry powder fire extinguisher to extinguish the fire. Using
liquid fire extinguisher may cause secondary danger.
6.Under no circumstances, please do not disassemble any part of the system without our
company or technical personnel authorized by our company, in order to prevent danger
or injury to your personal safety, and the equipment failure caused by this is not covered
by the warranty.
Remind
1.The product has been strictly inspected before shipment. If you find that the purchased
product has abnormal phenomena such as obvious deformation and odor, please contact
us in time.
2.In order to ensure the normal use and safety of the product, the equipment must be
reliably grounded before use.
3.In order not to affect the normal use, please ensure that the electrical parameters of the
related equipment are compatible and compatible with each other before use.
4.Do not mix batteries from different manufacturers, different types, different models,
and old and new batteries.
5.The use environment and storage methods have a certain impact on the service life and
reliability of this product, so environmental factors must be fully considered before
installation and use to ensure that the system is used in a suitable environment.
6.For long-term storage, the battery needs to be recharged once every 6 months, and the
recharged power should exceed the rated capacity by 80%.
7.After the battery is discharged to over-discharge protection, it should be recharged
within 24 hours. The theoretical battery discharge time is: t = C / I (t is the discharge
time, C is the battery capacity, and I is the total load current.)

Manual for Energy Storage SystemTW6000(6000P)
IV
Foreword
Manual Description
TW6000(6000P) lithium iron phosphate battery storage system can provide power
storage function for photovoltaic power generation users through parallel combination.
During the day, the excess power of solar energy can be stored in the battery, and at
night or when needed, the stored energy is used to power electrical equipment, which can
improve the efficiency of solar energy, peak shaving, and emergency power backup.
This user manual system introduces the basic structure, parameters, installation,
operation and maintenance of the equipment in detail.

Manual for Energy Storage SystemTW6000(6000P)
V
Contents
1.Introduction.................................................................................................................................................1
1.1 Introduction................................................................................................................................................1
1.2 Product Features........................................................................................................................................ 1
Product Identification Definition................................................................................................................. 2
2 Specifications...............................................................................................................................................3
2.1 Size & weight............................................................................................................................................ 3
2.2 Performance parameter.............................................................................................................................. 3
2.3 Interface Definition....................................................................................................................................3
2.3.1 Definition and description of DIP switch.........................................................................................4
2.3.2 Indicator definition and description.................................................................................................5
2.3.3 Buzzer action description.................................................................................................................. 6
2.3.4 Button description..............................................................................................................................6
2.3.5 Sleep and wake................................................................................................................................... 6
2.3.6 RS232 communication....................................................................................................................... 7
2.3.7 CAN communication......................................................................................................................... 7
2.3.8 RS485 communication....................................................................................................................... 7
2.4 Battery Management System（BMS）.................................................................................................... 8
2.4.1 Low Voltage Protection..................................................................................................................... 8
2.4.2 Current Protection.............................................................................................................................8
2.4.3 Temperature Protection.................................................................................................................... 8
2.4.4 Other Protection.................................................................................................................................9
3 Installation and configuration................................................................................................................... 9
3.1 Installation&Prepration..............................................................................................................................9
3.1.1 Environment Requirement............................................................................................................... 9
3.1.2 Tools.................................................................................................................................................. 10
3.1.3 Technical preparations....................................................................................................................10
3.1.4 Unpacking inspection.......................................................................................................................10
3.1.5 Engineering coordination................................................................................................................ 12
3.2 Equipment installation............................................................................................................................. 12
3.2.1 Preparation for installation.............................................................................................................12
3.2.2 Mechanical installation....................................................................................................................13
3.2.3 Electrical installation....................................................................................................................... 14
4. Using, maintenance and troubleshooting.............................................................................................. 16
4.1 battery system use and operation instructions......................................................................................... 16
4.2 Alarm Description and Solution.............................................................................................................. 17
4.3 Analysis and solution of common faults................................................................................................. 17

Manual for Energy Storage SystemTW6000(6000P)
1
1.Introduction
1.1 Introduction
The TW6000(6000P) lithium iron phosphate battery system is a standard battery system unit.
Customers can choose a certain quantity of TW6000(6000P) according to their needs, and form a
larger capacity battery pack in parallel to meet users' long-term power supply needs. The product
is especially suitable for applications with high operating temperature, limited installation space
and long service life.
1.2 Product Features
The TW6000(6000P) battery system uses lithium iron phosphate as the battery anode material
and is equipped with a high-performance BMS to effectively manage the battery cells. The
system has the following characteristics:
Meet European ROHS regulations, pass SGS certification, use the best non-toxic and
pollution-free battery;
The battery anode is made of lithium iron phosphate (LiFePO4) material, which has good
safety performance and long cycle life;
Adopt high-performance BMS battery management mode, with over-discharge, over-charge,
over-current, temperature and other protection functions;
With charge and discharge automatic management and single cell balance function;
Fully intelligent design, equipped with a centralized monitoring module, with three remote
(telemetry, remote signaling and remote control) functions;
Flexible configuration, multiple system units connected in parallel can extend the power
supply time of the system;
Self-cooling method, the whole system has extremely low noise;
The battery has less self-discharge, and it can be recharged for up to 10 months during
storage; no memory effect, shallow charging and discharging;
Wide temperature working range, -20 ℃ ~ + 55 ℃, good cycle life and discharge
performance at normal temperature;
Small battery size and light weight.

Manual for Energy Storage SystemTW6000(6000P)
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Product Identification Definition
Voltage of battery is higher than safety
voltage, it’s dangerous to touch
Operate carefully.
Read manual before operation
Default battery can’t be thrown to
trash can.
Please recycle the battery after serving
CE standards are met.
The DANGER label is attached.

Manual for Energy Storage SystemTW6000(6000P)
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2 Specifications
2.1 Size & weight
Table 2-1 TW6000(6000P) Standard sizes
2.2 Performance parameter
Table 2-2 Performance parameter table
Nominal Voltage
48V(51.2V)
Working voltage range
42~54V(44.8~57.6V)
Nominal Capacity
210Ah(0.5C)
Nominal Energy
10000(10750)Wh
Standard power
2.4(2.56)kw
Max power
4.8(5.12)kw
3S peak power
7.2(7.68)kw
3S peak current
150A
Charging current
50A
Discharging current
50A
2.3 Interface Definition
TW6000(6000P) Product panel interface configuration and functions. This section details the
functions of each interface on the front panel of the device.
Fig. 2-3 Interface diagram
Product Series
Rated Voltage
Rated Capacity
Dimensions
Weight
TW6000(6000P)
48V(51.2V)DC
210Ah
780*556*199mm
≈84kg

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2.3.1 Definition and description of DIP switch
When PACK is used in parallel, you can use the DIP switch on the BMS to
set the address to distinguish different PACKs. Avoid setting the same
address. The definition of the BMS DIP switch is shown in the table below.
Table 2-3 Dip switch dial definition
Address
DIP switch position
Description
#1
#2
#3
#4
0
OFF
OFF
OFF
OFF
Set to Pack0
1
ON
OFF
OFF
OFF
Set to Pack1 (host)
2
OFF
ON
OFF
OFF
Set to Pack2 
3
ON
ON
OFF
OFF
Set to Pack 3 
4
OFF
OFF
ON
OFF
Set to Pack 4
5
ON
OFF
ON
OFF
Set to Pack5
6
OFF
ON
ON
OFF
Set to Pack6
7
ON
ON
ON
OFF
Set to Pack7
8
OFF
OFF
OFF
ON
Set to Pack8
9
ON
OFF
OFF
ON
Set to Pack9
10
OFF
ON
OFF
ON
Set to Pack10
11
ON
ON
OFF
ON
Set to Pac11
12
OFF
OFF
ON
ON
Set to Pac12
13
ON
OFF
ON
ON
Set to Pack13
14
OFF
ON
ON
ON
Set to Pack14
15
ON
ON
ON
ON
Set to Pack15
Item
Name
Definition
1
Ground point
2
Positive socket
Battery output positive or parallel positive cable
3
Negative socket
Battery output negative or parallel negative cable
4
ADD
DIP switch
5
SW（Wake on battery /
Sleep switch)
When the "OFF / ON" key is ON, press and hold
this key for 3 seconds.Put the battery into the
power-on or hibernation state.
6
SOC
The number of green lights shows the remaining
battery power, as shown in Table 2-3.
7
ALM
Red light, flashing when alarm. Protection is always
on. Conditions that trigger protection
Normally recover automatically after lifting
8
RUN
Green light, flashing during standby, flashing during
charging, and always on when discharging
9
RS232
Debug communication port, support RS232
communication
10
CAN/RS485
Host external communication port, support CAN
and RS485 communication
11
COM0、COM1
Slave internal parallel communication port, support
RS485 communication
12
DRY CONTACT
Dry contact
13
Switch
OFF/ON，Must be "ON" when used

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2.3.2 Indicator definition and description
Table 2-4 LED working status indication
Status
Normal/
Alarm /
Protection
RUN
ALM
Battery indicator
LED
Description
●
●
●
●
●
●
Shutdown
Dormant
off
off
off
off
off
off
All off
Standby
Normal
F1
off
According to battery
indicator
standby mode
Alert
F1
F3
Module low voltage
Charge
Normal
on
off
According to battery
indicator
(Battery indicator
flashes up to 2 LEDs)
Highest power LED
blinks (blink 2),
ALM does not blink
during overcharge
alarm
Alert
on
F3
Over
charge
protection
on
off
on
on
on
on
If there is no utility
power, the indicator
light
Go to standby.
Temperature,
overcurrent,
Fail-safe
off
on
off
off
off
off
Stop charging
Discharge
Normal
F3
off
According to battery
indicator
Alert
F3
F3
Under
voltage
protection
off
off
off
off
off
off
Stop discharging
Temperature,
over current,
Short circuit,
Reverse
connection,
Fail-safe
off
on
off
off
off
off
Stop discharging
Lapse
off
on
off
off
off
off
Stop charging&
discharging
Remarks:Flash 1 is short for F1;Flash 2 is short for F2;Flash 3 is short for F3.
Table 2-5 Capacity instructions
Status
charging
Discharging
Capacity indicator
RU
N
●
AL
M
●
L4
●
L3
●
L2
●
L1
●
RU
N
●
AL
M
●
L4
●
L3
●
L2
●
L1
●
Battery
（%）
SOC≤0%
on
F3
off
off
off
off
off
off
off
off
off
off
0<SOC≤25%
on
off
off
off
off
F2
F3
off
off
off
off
on
25<SOC≤50%
on
off
off
off
F2
on
F3
off
off
off
on
on
50<SOC≤75%
on
off
off
F2
on
on
F3
off
off
on
on
on
75<SOC<100%
on
off
F2
on
on
on
F3
off
on
on
on
on
SOC≥100%
on
off
on
on
on
on
F3
F3
on
on
on
on

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●Running lights
on
F3
Table 2-6 Flash description
Flashing way
on
off
Remarks
Flashing 1
0.25S
3.75S
F1
Flashing 2
0.5S
0.5S
F2
Flashing 3
0.5S
1.5S
F3
Remarks:Flash 1 is short for F1;Flash 2 is short for F2;Flash 3 is short for F3.
Notes:
The alarm can be enabled or disabled through the host computer. The factory default is enabled.
2.3.3 Buzzer action description
When the fault occurs, every 1S will beep 0.25S;
When protecting, every 2S will beep 0.25S (except for overvoltage protection):
When the alarm occurs, every 3S will beep 0.25S (except for overvoltage alarm);
The buzzer function can be enabled or disabled by the host computer. The factory default is
disabled.
2.3.4 Button description
When the BMS is in the dormant state, press the button (3 ~ 6S) and release it, the protection
board is activated, and the LED indicator lights up sequentially for 0.5 seconds from "RUN".
When the BMS is in the activated state, press the button (3 ~ 6S) and release it, the protection
board will be dormant, and the LED indicator will turn on for 0.5 seconds starting from the
lowest battery.
When BMS is activated, press the button (6 ~ 10S) and release, the protection board is reset, and
the LED lights are all the same Lights for 1.5 seconds.
After the BMS is reset, the parameters and functions set by the host computer are still
retained. If the original parameters need to be restored, they can be implemented by the
"restore default values" of the host computer, but the related operation records and stored
data remain unchanged (such as power, cycle times, Protect records, etc.).
2.3.5 Sleep and wake
2.3.5.1 Sleep
When any of the following conditions are met, the system enters the low-power mode:
1) Single or overall over-discharge protection has not been released within 60 seconds.
2) Press the button (3 ~ 6S), and release the button.
3) The minimum cell voltage is lower than the sleep voltage, and the duration reaches the sleep
delay time (at the same time, no communication, no protection, no balance, no current).
4) Standby time exceeds 24 hours (no communication, no charge and discharge, no mains).
5) Force shutdown by PC software.
Before entering hibernation, make sure that the input terminal is not connected to external voltage,
otherwise it will not be able to enter the low power consumption mode.
2.3.5.2 Wake
When the system is in the low power consumption mode and meets any of the following
conditions, the system will exit the low power consumption mode and enter the normal operation
mode:

Manual for Energy Storage SystemTW6000(6000P)
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Connect the charger. The output voltage of the charger must be greater than 48（51.2）V.
Press the button (3 ~ 6S), and release the button.
Note: After single or overall over-discharge protection, it enters low power consumption mode,
and wakes up at regular intervals every 4 hours to turn on charge and discharge MOS. Such as
Can be charged, it will exit hibernation and enter normal chrging; if it cannot be charged after 10
consecutive automatic wake-ups, it will no longer To wake up.
When the system is defined as the end of charging, the recovery voltage is not reached after 2
days of standby (standby time set value), and the charging is forcibly resumed until the end of
recharging.
2.3.6 RS232 communication
The BMS can communicate with the host computer through the RS232 interface, so that it can
monitor various battery information, including battery voltage, current, temperature, status, and
battery production information. The default baud rate is 9600bps.
Table 2-7 RS232
interface definition
RS232 communication interface
2.3.7 CAN communication
CAN communication, the default communication rate is 500K.
2.3.8 RS485 communication
With dual RS485 interface, you can check the information of PACK. The default baud rate is
9600bps. If you need to communicate with the monitoring equipment through RS485, the
monitoring equipment acts as the host and polls data according to the address.The address
setting range is 2 ~ 15.
Table2-8 CAN / RS485
interface definition
CAN / RS485
communication interface
RS232--using 6P4C vertical RJ11 socket
RJ12 pin
Definition
description
note
1
NC
empty
2
GND
3
TXD
4
RXD
5
GND
6
NC
empty
CAN / RS485--using 8P8C vertical RJ45 socket
RJ45 pin
Definition
description
note
1
RS485-B1
2
RS485-A1
3
GND
485 and CAN
common ground
4
CANH
5
CANL
6
GND
485 and CAN
common ground
7
RS485-A1
8
RS485-B1

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Table 2-9 COM0 / COM1
interface definition
COM0 COM1
2.4 Battery Management System（BMS）
2.4.1 Low Voltage Protection
Discharge low voltage protection :
When discharging, the voltage of any single cell is lower than the protection value, the over
discharge protection will be started, the battery buzzer alarm. When the voltage of all cells is
recovered to the range of released value, the protection is removed.
Charging Over Voltage Protection:
During charging, when the total voltage of battery pack or the voltage of any single cell reaches
the protection value, the system stops charging. When the total voltage and the single voltage
return to the released value range, the protection will be released.
2.4.2 Current Protection
Charging Over Current Protecion:
When the charging current is more than the protection value, the battery buzzer will alarm and
the system will stop charging. The protection will release after the system delays the rated time.
Discharging Over Current Protection:
When the discharge current is more than the protection value, the battery buzzer will alarm and
the system will stop discharging. The protection will release after the system delays
the rated time.
Note: The buzzer alarm setting can be manually closed on the computer, and it is opened by
default
2.4.3 Temperature Protection
Charge low/high temperature protection:
During charging, when the battery temperature exceeds the range of - 0 ℃ ~ + 55 ℃, the system
starts the charging temperature protection, stops charging, recovering to the rated return value,
and then the protection is released.
Discharge low/high temperature protection:
During charging, when the battery temperature exceeds the range of -20℃~+55℃, the system
starts the charging temperature protection, stops charging, recovering to the rated return value,
and then the protection is released.
COM0--using 8P8C
vertical RJ45 socket
COM1--Using 8P8C
vertical RJ45 socket
RJ45 pin
Definition
description
RJ45 pin
Definition
description
1、8
RS485-B
9、16
RS485-B
2、7
RS485-A
10、15
RS485-A
3、6
GND
11、14
GND
4、5
NC
12、13
NC

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2.4.4 Other Protection
Short circuit protection:
When the battery is activated from the off state, if there is a short circuit, the system will start the
short circuit protection for 30 seconds
Shut down automatically:
When the equipment has no external load and power supply for 10 hours, it will automatically
shut down.
Note:The max.discharge current of battery should be bigger than max.working current
required for load.
3 Installation and configuration
3.1 Installation&Prepration
Safety Regulation
Only the personnel who have received the electrical system training and fully mastered the
electrical knowledge can install this system. Always follow the safety regulations listed below
and local safety regulations during installation
All circuits with external voltage less than 48V connected to the power system must meet
SELV requirements defined in IEC60950
If operating inside the cabinet, make sure that the power system is not active. The battery
shall also be shut down
The cables shall be arranged reasonably and protected to avoid touching these cables when
operating the power equipment
It is recommended to wear the following safety gear when dealing with the battery pack.
Insulated gloves Safety shoes Safety goggles
3.1.1 Environment Requirement
Working Temperature -20℃～+55℃
Storage Temperature：-10℃～+35℃
Relative Humidity：5%～85%RH
Altitude：< 4000m
Working environment: there is no conductive dust and corrosive gas, and the following
conditions are met:
The installation site shall be far away from the sea to avoid salt water and high humidity
environment
The ground is flat and level
There are no inflammables and explosives in the accessories of the installation point

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The ideal ambient temperature is 15 ~ 30 ℃
Keep away from dust and dirty areas
3.1.2 Tools
The tools and meters that may be used in Table 3-1:
Table 3-1 Tools
Name
screwdriver Slotted screwdriver
Phillips screwdriver
multimeter
Torque wrench
Clamp meter
Diagonal pliers
Insulation tape
Needle-nose pliers
thermometer
Wire cutter
Anti-static bracelet
Wire stripping pliers
Tie
Electric drill
Tape measure
3.1.3 Technical preparations
Electrical interface check
Devices connected directly to the battery can be user equipment, power supplies, or other power
devices.
Confirming whether the user's photovoltaic power generation equipment, power supply or
other power supply equipment has a direct current output interface, and measuring whether
the output voltage of the direct current interface meets the voltage range requirements in 2.2
performance parameter table.
Confirming that the maximum discharge current capacity of the DC interface of the user's
photovoltaic power generation equipment, power supply or other power equipment should be
greater than the maximum charging current of the product used in the performance parameter
table. For the maximum charging current of the product used, the DC interface of the user's
photovoltaic power generation equipment should have a current limiting function to ensure
the normal operation of the user equipment first.
Make sure that the maximum operating current of the battery-powered user equipment
(inverter DC input) should be less than 2.2 The maximum discharge current of the product
used in the performance parameter table.
Security check
It is strictly prohibited to place flammable, explosive and other dangerous materials next to the
battery. Fire equipment should be available near the equipment, such as portable dry powder fire
extinguishers. Where necessary, an automatic fire protection system should be provided.
3.1.4 Unpacking inspection
When the equipment arrives at the installation site, it must be loaded and unloaded in
accordance with regulations to prevent sunlight and rain. Before unpacking, check the total
number of pieces according to the shipping list attached to each packing box, and check
whether the appearance of the packing box is intact;
Handle with care during unpacking to protect the surface coating of objects;
When opening the packaging box, the installer should first read the technical documents and
check the list, and check whether the items are complete and intact according to the
configuration table and packing list. If the internal packaging is damaged, it must be checked

Manual for Energy Storage SystemTW6000(6000P)
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and recorded. The packing list is as follows:
Part name
Specification
Quantity
Picture
Battery module
48（51.2）V210Ah
780×556×199mm
1
Positive parallel line
（Optional）
Red
/25mm²/L700mm
1
Negative parallel line
（Optional）
Black
/25mm²/L700mm
1
Positive power line
（Optional）
Red
/25mm²/L2050mm
1
Negative power line
（Optional）
Black
/25mm²/L2050mm
1
Slave parallel
Communication line
（Optional）
Black/700mm /
Double RJ45 plug
1
Host and inverter
Communication line
Black/L2000mm /
Double RJ45 plug
1

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3.1.5 Engineering coordination
Note the following before construction:
Power cord specifications
Power cord specifications should meet the maximum discharge current requirements of each
product
Installation space and load
Ensure that the battery has sufficient installation space, and that the case and bracket where the
battery is installed have sufficient load-bearing capacity.
wiring
Make sure the power and ground wires are routed properly. Not easy to short circuit, water and
corrosion.
3.2 Equipment installation
Table 3-2 Table 3-2 Installation steps
3.2.1 Preparation for installation
Equipment and tools ready for installation
Check the chassis to make sure that the ON / OFF switch is in the "OFF" state toensure
no-power operation.
Step1
Preparation for
installation
1.Ensure the ON / OFF switch on the chassis
is"OFF" state to ensure no-power operation.
Step2
Mechanical
installation
1. Determine the location of the cabinet
2.Top harness pre-installed
3.Battery module installation
Step3
Mechanical
installation
1.Ground cable installation
2.Battery module parallel cable installation
3.Battery Module Header Cable Installation
4.Battery module total negative cable installation
5.communication interface connection
Step4
Battery system
self-test
1.Press the ON / OFF switch to the "ON" state
2.BMS system power-up activation
3.Check system output voltage
4.Shut down the system
Step5
Connect the
inverter
1.Install battery system total positive and
negative cables to the inverter
2.Connect the external CAN communication
cable to the inverter

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3.2.2 Mechanical installation
Method 1: Pendant bracket installation
1. Put the hanger bracket close to the wall, and mark the wall
according to the space，Then use a percussion drill according to the
vacancy of the pendant, drill 8 holes with a depth of 100mm
2. Install the expansion screw on the wall so that the expansion iron
pipe and the wall parallel.
3. Install the pendant bracket on the expansion screw,
and then tighten the nut
Method 2: battery installation
1.Lift the TW6000 (6000P) battery pack and hang it on
the bracket、

Manual for Energy Storage SystemTW6000(6000P)
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2.Use 4 M5-20mm screws to lock the bracket and battery pack;
3.2.3 Electrical installation
Before connecting the power supply and ground wire, it is recommended to use a
multimeter to measure the on-off and short circuit of the cable, confirm the
positive and negative poles, and label the cable.
Measuring method:
Cable on/off: select the buzzer of the multimeter, and use the probe
to measure the two ends of the same color cable . If the buzzer sounds,
it means the cable is available.
Short circuit judgment:select the resistance gear of the multimeter
and measure the positive and negative poles at the same
end with the probe. If the resistance shows infinite, it means the cable
is available.
Positive and negative poles: after the power line is connected visually,
the positive and negative poles of the battery shall be respectively
connected to the positive and negative poles of the opposite equipment.
Selection requirements with air switch:
Voltage：U>60VDC
Current:I= Inverter power/45V

Manual for Energy Storage SystemTW6000(6000P)
15
PNG1 PNG2 PNG3
Negative
power line
Positive
power line
Communication line
between host and
inverter
Positive
parallel wire
Negative
parallel wire
Slave Parallel
communication line
Air switch
Inverter