Sunways STE-BS5 User manual

SUNWAYS TECHNOLOGIES CO., LTD.
STE-BS Li-HV System
User Manual
EN

CONTENTS
1 Preface ……………………………………………………… 5
1.1 Overview ………………………………………………………………………… 5
1.2 Target Groups ……………………………………………………………………5
2 Safety Instructions ……………………………………… 6
2.1 Safety Notes ……………………………………………………………………… 6
2.2 Important Safety Matters ……………………………………………………… 6
2.3 Environmental Conditions ……………………………………………………9
2.4 Statement ………………………………………………………………………… 9
2.5 Symbol on the Battery Label ……………………………………………… 10
2.6 Symbol on the Packing Box ………………………………………………… 12
3 Product Description ……………………………………… 13
3.1 Basic Features ………………………………………………………………… 13
4 Battery Introduction ……………………………………… 14
4.1 Appearance Introduction …………………………………………………… 14
4.2 Packing List …………………………………………………………………… 16
5 Installation ………………………………………………… 18
5.1 Location ……………………………………………………………………… 18
5.2 Mounting ……………………………………………………………………… 18
5.3 Electrical Connection ……………………………………………………… 26
6 System Start and Stop …………………………………… 31
6.1 Start System …………………………………………………………………… 31
6.2 Stop System …………………………………………………………………… 32
7 Troubleshooting …………………………………………… 33
7.1 Requirements ………………………………………………………………… 33
8 Battery Storage …………………………………………… 35
8.1 Storage Requirements ……………………………………………………… 35
8.2 Storage Duration Overdue and Recharge ………………………………… 37
9 Troubleshooting …………………………………………… 38
9.1 Maintenance ………………………………………………………………… 38
9.2 Troubleshooting ……………………………………………………………… 39
10 Technical Parameters …………………………………… 40

4 5
Attention
The products, services or features purchased are subject to the commercial contracts
and terms of Sunways Technologies Co., Ltd. All or part of the products, services or
features described in this document may not be within purchased. Unless otherwise
agreed in the contract, the Company shall not make any express or implied
declaration or guarantee of the contents of this document.
Due to product version upgrades or other reasons, the contents of this document will
be updated periodically. Unless otherwise agreed, this document serves only as a
guide to use, and all statements, information and recommendations in this document
do not constitute any express or implied guarantee.
Before transporting, storing, installing, operating, using, and/or maintaining the
equipment, read this document, strictly follow the instructions provided herein,
and follow all the safety instructions on the equipment and in this document. The
Danger, Warning, Caution, and Notice statements described in this document do not
cover all the safety precautions. You also need to comply with relevant international,
national, or regional standards and industry practices. The Company shall not be
liable for any consequences that may arise due to violations of safety requirements or
safety standards concerning the design, production, and usage of the equipment.
The equipment should be used in an environment that meets the design
speci󽗉cations. Otherwise, the equipment may be faulty, malfunctioning, or damaged,
which is not covered under the warranty. The Company shall not be liable for any
property loss, personal injury, or even death caused thereby.
1 Preface
※ 1.1 Overview
This manual is an integral part of Sunways STE-BS series LFP battery system (hereinafter
referred to as the battery or STE-BS battery). It mainly introduces the assembly,
installation, electrical connection, debugging, maintenance and troubleshooting of
the products. Before installing and using battery, please read this manual carefully,
understand the safety information and be familiar with the functions and characteristics
of hybrid battery.
※ 1.2 Target Groups
This manual is applicable to the electrical installers with professional quali󽗉cations and
end-users. If there are any problems in the installation process, please call Sunways
service telephone at [phone] or email Sunways at [e-mail]
for consultation.

6 7
2 Safety Instructions
※ 2.1 Safety Notes
Before installation, please read this manual and warning labels on battery carefully and
follow the instructions in this manual strictly.
※ 2.2 Important Safety Matters
SAVE THESE IMPORTANT SAFETY INSTRUCTIONS.
STE-BS stackable Li-HV system installation and repair instructions assume knowledge
of high voltage electricity and should only be performed by Sunways certi󽗉ed installers.
Sunways assumes no liability for injury or property damage due to repairs attempted by
unquali󽗉ed individuals or a failure to properly follow these instructions. These warnings
and cautions must be followed when using our product.
Warning
Read this entire document before installing or using STE-BS stackable Li-HV system.
Failure to do so or to follow any of the instructions or warnings in this document can
result in electrical shock, serious injury, or death, or can damage STE-BS stackable Li-HV
system, potentially rendering it inoperable.
Warning
A battery can present a risk of electrical shock, fire, or explosion from vented gases.
Observe proper precautions.
Warning
STE-BS stackable Li-HV storage system installation must be carried out only by Sunways
Certi󽗉ed Installers, who have been trained in dealing with high voltage electricity.
Warning
The product is heavy and challenging to lift.
Warning
Use STE-BS Battery only as directed.
Warning
Do not use STE-BS Battery if it is defective, appears cracked, broken, or otherwise
damaged, or fails to operate.
Warning
Do not use STE-BS Battery if it is defective, appears cracked, broken, or otherwise
damaged, or fails to operate.
Warning
Do not attempt to open, disassemble, repair, tamper with, or modify STE-BS Battery.
STE-BS Battery is not user serviceable. LFP Cells in STE-BS Battery are not replaceable.
Contact the STE-BS Authorized Reseller who sold the STE-BS Battery for any repairs.
Warning
Do not connect STE-BS Battery to alternating current carrying conductors. STE-BS
storage system including battery and battery must be wired to either a battery or a DC
combiner panel that is then wired to an inverter. No other wiring con󽗉guration may be
used.
Warning
STE-BS Battery contains components, such as switches and relays, that can produce arcs
or sparks.
Warning
To protect STE-BS Battery and its components from damage when transporting, handle
with care. Do not impact, pull, drag, or step on STE-BS Battery. Do not subject STE-BS
Battery to any strong force. To prevent damage, leave STE-BS Battery in its shipping
packaging until it is ready to be installed.
Warning
Do not insert foreign objects into any part of STE-BS Battery.

8 9
Warning
Do not expose STE-BS Battery or its components to direct 󽗊ame.
Warning
Do not install STE-BS Battery near heating equipment.
Warning
Do not immerse STE-BS Battery or its components in water or other 󽗊uids.
Caution
Do not use cleaning solvents to clean STE-BS Battery, or expose STE-BS Battery to
󽗊ammable or harsh chemicals or vapors.
Caution
Do not use fluids, parts, or accessories other than those specified in this manual,
including use of non-genuine STE-BS parts or accessories, or parts or accessories not
purchased directly from STE-BS or a STE-BS -certi󽗉ed party.
Caution
Do not place STE-BS Battery in a storage condition for more than one (1) month, or
permit the electrical feed on the STE-BS Battery to be severed for more than one (1)
month, without placing STE-BS Battery into a storage condition in accordance with STE-
BS’s storage speci󽗉cations.
Caution
Do not paint any part of STE-BS Battery, including any internal or external components
such as the exterior shell or casing.
Caution
Do not connect STE-BS Battery directly to photovoltaic (PV) solar wiring.
Caution
When installing STE-BS Battery in a garage or near vehicles, keep it out of the driving
path. If possible, install the STE-BS Battery on a side wall and/or above the height of
vehicle bumpers.
※ 2.3 Environmental Conditions
Warning
Install STE-BS Battery at a height that prevents damage from 󽗊ooding.
Warning
Operating or storing STE-BS Battery in temperatures outside its speci󽗉ed range might
cause damage to STE-BS Battery.
Warning
Do not expose the STE-BS Battery to ambient temperatures above 45℃ (113℉ ) or below
0℃ (32℉ ).
Caution
Ensure that no water sources are above or near STE-BS Battery, including downspouts,
sprinklers, or faucets.
※ 2.4 Statement
Sunways Technologies Co.,Ltd. has the right not to undertake quality assurance in any of
the following circumstances:
① Damages caused by improper transportation.
② Damages caused by incorrect storage, installation or use.

10 11
③ Damages caused by installation and use of equipment by non-professionals or
untrained personnel.
④ Damages caused by failure to comply with the instructions and safety warnings in this
document.
⑤ Damages of running in an environment that does not meet the requirements stated in
this document.
⑥ Damages caused by operation beyond the parameters speci󽗉ed in applicable technical
speci󽗉cations.
⑦ Damages caused by unauthorized disassembly, alteration of products or modi󽗉cation
of software codes.
⑧ Damages caused by abnormal natural environment (force majeure, such as lightning,
earthquake, 󽗉re, storm, etc.).
⑨ Any damages caused by the process of installation and operation which don't follow
the local standards and regulations.
⑩ Products beyond the warranty period.
※ 2.5 Symbol on the Battery Label
Sunways Technologies Co.,Ltd. has the right not to undertake quality assurance in any of
the following circumstances:
① Damages caused by improper transportation.
② Damages caused by incorrect storage, installation or use.
Symbol Description
Do not sit or put things on battery.
Do not disconnect or disassemble by non-professional personnel.
Do not place near open 󽗊ame or 󽗊ammable material.
Do not place at a children’s or pet’s reach area.
Electric shock hazard, live parts, risk of electric shock, do not touch.
If 󽗉re, switch o󽗈 the breaker on DC side and stay away from battery.
Please read the instructions carefully before installation.
The battery cannot be disposed of with household waste.

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3 Product Description
※ 3.1 Basic Features
3.1.1 Function
The STE-BS series is a stackable mounted energy storage battery.
3.1.2 Models
The STE-BS series battery includes 9 models which are listed below:
STE-BS5, STE-BS7, STE-BS10, STE-BS12, STE-BS15, STE-BS17, STE-BS20, STE-BS23, STE-BS25.
8
Symbol Description
Handle with care.
This side up.
Keep dry.
Stacked layers.
※ 2.6 Symbol on the Packing Box

14 15
4 Battery Introduction
※ 4.1 Appearance Introduction
4.1.1 Control Module
Item Terminal Note
1Battery MCB Control battery output
2Battery output +
3Battery output -
4Service COM Speci󽗉ed Debug Interface
5Inverter COM Connect to the inverter communication port
6Power button Turn the battery on and o󽗈
Figure 4-1 Control module
Figure 4-2 Battery Module
Left side view Right side view
Figure 4-3 Base
1
2 3
4
5
6

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Control Module×1 Battery Module×2~10
Base×1 Fixings×2
Fixed Bolt×40
※ 4.2 Packing List
The package of the battery includes the following accessories. Please check whether the
accessories in the packing box are complete when receiving the goods. See Figure 3-7 for
the packing list.
Expansion×4
STE-M2560-S STE-P2560-S
STE-B2560-S
Battery Plug×1 PE Termina×1

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5 Installation
※ 5.1 Location
① The area is completely water proof. The 󽗊oor is 󽗊at and level.
② There are no 󽗊ammable or explosive materials.
③ The ambient temperature is within the range from 0 to 50.
④ The temperature and humidity are maintained at a constant level. There is minimal
dust and dirt in the area.
⑤ The distance from heat source is more than 2 meters.
⑥ The distance from air outlet of whole system is more than 0.5 meters. Do not cover or
wrap the battery case or cabinet.
⑦ Do not place at children or pet touchable area. The installation area shall avoid direct
sunlight.
⑧ There are no mandatory ventilation requirements for battery module, but please avoid
installation in con󽗉ned area (minimum 300mm to top/left/right/front).
⑨ The aeration shall avoid of high salinity, humidity, or temperature.
5.2.1 Install the Base
※ 5.2 Mounting
① Check the installation environment to ensure ground level.
② Place the base on the ground, and make sure it is level and stable.
Figure 5-1 Adjust the base to level state
Measure with a spirit level
③ Distance between base and wall is 20mm~120mm.
Figure 5-2 Distance between base and wall
5.2.2 Install the Module
① After the base is installed, remove the protective film of the terminals, and the
remaining battery module and control module are then placed in turn.
Figure e 5-3 Remove the protective 󽗉lm
20mm-120mm
Wall

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Figure 5-4 Place the battery modules
② Install the 󽗉xings on both sides of the control module.
Figure 5-5 Install the 󽗉xings
③ Use the 󽗉xings as the template to mark the position of 4 holes on the wall.
Figure 5-6 Mark the position
④ Remove the control module.
Figure 5-7 Remove the control module
Wall

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⑤ Use an electrical driller with 10mm diameter bit to drill 4 holes in the wall with 80mm
depth.
Figure 5-8 Drill holes
Warning
Before drilling, make sure to avoid any buried water tube and electric wires in the wall.
⑥ Insert the expansion tubes into the holes.
Figure 5-9 Insert the expansion tubes
Hole depth:80mm
⑦ Place the control module on battery module.
Figure 5-10 Place the control module
⑧ Tighten modules with 󽗉xed bolt on the left and right side.
Figure 5-11 Tighten modules

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⑨ Insert the expansion screws into the holes, then fix the fixings onto the wall with
expansion screws by using a cross screwdriver.
Figure 5-12 Fix the 󽗉xings
⑩ Turn the adjusting screw to 󽗉x the battery onto the wall by using a wrench.
Figure 5-13 Fix the battery
5.2.3 Ground Connection
Attention
Proper grounding is good for resisting surge voltage shock and improving EMI
performance. Battery must be well-grounded.
For a system with only one battery, the PE cable needs to be grounded.
For a multi-battery system, all batteries PE wires need to be connected to the same
grounding copper bar to ensure equipotential bonding.
Ground terminal connection steps:
① The external grounding terminal is located in the right side of the control module.
② Fix the grounding terminal to the PE wire with a proper tool and lock the grounding
terminal to the grounding hole in the right side of the control module.
③ The cross-sectional area of the external grounding cable is 6mm .
2
Figure 5-14 Grounding terminal connection
PE

26 27
※ 5.3 Electrical Connection
Warning
A high voltage in the conductive part of the battery may cause an electric shock. When
installing the battery, make sure that the DC sides of the battery is completely de-
energized.
Warning
Do not ground the positive or negative pole of the battery output, otherwise it will cause
serious damage to the battery.
Warning
Static may cause damage to the electronic components of the battery. Anti- static
measures should be taken during installation and maintenance.
Attention
Do not use other brands or other types of terminals other than the terminals in the
accessory package. Sunways has the right to refuse to held liable of all damages caused
by the mixed-use of terminals.
Attention
Moisture and dust can damage the battery, ensure the cable gland is securely tightened
during installation. The warranty claim will be invalidated if the battery is damaged as a
result of using poorly connected cable connector.
5.3.1 Cables Connection
After mechanical installation is 󽗉nished, here are positive power line, negative power line,
communication cable and earth cable between inverter and control module need to be
connected.
The picture on this page shows the cables connection. Please follow the instruction and make
sure all the cables are connected correctly.
Figure 5-15 Wiring diagram
① Select an appropriate DC cable.
5.3.2 Battery Power Connector Assembly Procedures
Cable type Conductor cross-sectional area (mm²)
AWG 10
Outside diameter (mm²) Conductor core section (mm²)
5.5-8.0 4.0-6.0
② Peel o󽗈 the DC cable insulation sleeve for 15 mm, as shown in Figure 5-16:
Wire cross-sectional area 5.5-8.0mm215mm
Figure 5-16

28 29
③ Use a 󽗊athead screwdriver to open the clamping bracket in the connector, as shown in
Figure 5-17:
Figure 5-17
④ Insert the stripped DC cable to the battery connector deep enough and toggle the
clamping bracket to make sure it tightly locked with the stripped cable, as shown in Figure
5-18:
Figure e 5-18
⑤ Push the battery connector to the thread joint, and use an open wrench to lock the con-
nector in a torsion of 2Nm tightly, as shown in Figure 5-19:
Figure 5-19
One side of the communication cable used to connect the inverter and control module
port is preinstalled on the inverter before leaving the factory, insert the other side to the
“Inverter COM” port in the control module when installing it.
Communication interface and de󽗉nition:
Warning
① Before making the battery connector, please make sure the polarity of the cable is
correct.
② Use a multimeter to measure the voltage of the battery pack and make sure the
voltage is within the inverter limitation and the polarity is correct.
⑥ Insert the positive and negative connector into the inverter battery terminals respec-
tively, and a “click” sound represents the assembly in place, as shown in Figure 5-20:
Figure 5-20
5.3.3 Communication Cable Connection

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Item Service COM Inverter COM
1 RS485_A /
2 RS485_B /
3 / /
4 / CAN_H
5 / CAN_L
6 RS232_RX /
7 RS232_TX /
8 RS232_GND /
1
3
52
4
6
8
7
6 System Start and Stop
※ 6.1 Start System
When starting the system, follow these steps:
① Turn on the DC Switch in the bottom of inverter.
② Turn on the DC Switch on the control module.
③ Hold down the POWER button for 5 seconds until the power button lights up.
④ Observe the status indicator，green light 󽗊ashing indicates the normal output.
⑤ Switch on the AC breaker 󽗉rst.
Figure 6-1
Figure 6-2
ON
Wall

32 33
※ 6.2 Stop System
When turning o󽗈 the system, please follow the steps below:
① Shut o󽗈 the inverter through the APP or the button on the display 󽗉rst.
② Disconnect the breakers on the grid and load side.
③ Turn o󽗈 the DC Switch on the control module.
④ Wait 30 seconds and then turn the inverter DC switch to the “OFF”. At this time,
there is remaining power in the inverter capacitor. Wait for 5 minutes until the inverter is
completely de-energized before operating.
⑤ Disconnect the AC and DC cables.
⑥ The inverter will start to check the DC and AC input parameters and self-check, and if
everything is normal, the inverter will start to work according to the work mode which
you set on the App. The inverter display and indicators will show relevant parameters and
status.
7 Troubleshooting
※ 7.1 Requirements
Danger
Do not load or unload batteries in a rude way. Otherwise, the batteries may be short-
circuited or damaged (such as leakage and crack), catch 󽗉re, or explode.
Warning
Move batteries in the required direction. They must not be placed upside down or tilted,
and must be protected against falling down, mechanical impact, rains, snows, and falling
into water during transportation.
Batteries must be transported separately. Do not transport a cabinet with batteries
installed. If the cabinet needs to be transported or moved, remove the batteries 󽗉rst.
Attention
Restart the battery only after removing the fault that impairs safety performance.
Never arbitrarily replace any internal components.
For any maintenance support, please contact Sunways. Otherwise, Sunways shall not be
held liable for any damage caused.
Note
Servicing of the device in accordance with the manual should never be undertaken in
the absence of proper tools, test equipment or the latest revision of the manual which
has been clearly and thoroughly understood
STE-BS battery passes the certificate of the UN38.3 (UN38.3: section 38.3 of the sixth
Revised Edition of the Recommendations on the Transport of Dangerous Goods, Manual
of Tests and Criteria). The batteries can be delivered to the site directly and transported by
land and water.
When battery need to be transported, please follow bellow requirements strictly.
1) Choose sea or roads in good conditions for transportation as transportation by railway
or air is not supported. Avoid tilt or jolt during transportation.
2) Maritime transport must comply with the International Maritime Dangerous

34 35
8 Battery Storage
※ 8.1 Storage Requirements
The STE-BS battery storage environment requirements are as follows. :
– Ambient temperature: 18–25° C
– Relative humidity: less than 40%
– Dry, clean, and well-ventilated
– Away from corrosive organic solvents and gases
– Away from direct sunlight
– At least 2 meters away from heat sources
1) The batteries in storage must be disconnected from external devices. The indicators (if
any) on the batteries must be o󽗈.
2) Ensure that the storage duration is updated after every charge.
3) The warehouse keeper should collect battery storage information every month and
periodically report the battery inventory information. The batteries that have been stored
overdue should be recharged in a timely manner.
4) Do not unpack batteries. Batteries should be recharged during storage by professionals
as required, and they should be put back to their packaging after recharge.
5) If batteries have been stored overdue, promptly report the event to the person
in charge.
6) Ensure that batteries are delivered based on the “󽗉rst in, 󽗉rst out" rule.
7) Handle batteries with caution to avoid damage.
8) Inappropriate storage will cause the battery performance and service life may be
a󽗈ected. Sunways Technologies Co.,Ltd. has the right not to undertake quality assurance
in irregular storage.
Warming
Ensure that batteries are stored indoors. Install batteries in a dry, clean, and ventilated
environment that is free from sources of strong infrared or other radiations, organic
solvents, corrosive gases, and conductive metal dust. Do not expose batteries to sunlight
or water and keep them far away from sources of heat and ignition.
Goods Code (IMDG Code).
3) Road transport must comply with the Agreement Concerning the International Carriage
of Dangerous Goods by Road (ADR) or JT/T T617.
4) Before transportation, check that the battery package is intact and that there is no
abnormal odor, leakage, smoke, or sign of burning. Otherwise, the batteries cannot be
transported.
5) The packing case must be secured for transportation. Handle the case with care during
loading, unloading, and transportation with moisture-proof measures in place.
6) Exercise caution when moving batteries to prevent bumping and ensure personal safety.
7) Unless otherwise speci󽗉ed, dangerous goods cannot be mixed with goods containing
food, medicine, animal feed, or their additives in the same vehicle or container.
8) Unless otherwise speci󽗉ed, when dangerous goods packages are loaded in the same
vehicle or container as ordinary goods, they should be separated in either of the following
ways:
– Use a spacer that is as high as the packages.
– Keep a distance of at least 0.8 m around.

36 37
Warming
Risk of battery damage or personal injury due to incorrect service!Dispose of bulged,
deformed, damaged, or leaking batteries irrespective of how long they have been stored.
Warming
Place batteries correctly according to the signs on the packing case during storage. Do
not place batteries upside down, lay them on one side, or tilt them. Stack batteries in
accordance with the stacking requirements on the packing cases.
Warming
Store batteries in a separate place. Do not store batteries together with other devices. Do
not stack batteries too high. The site must be equipped with quali󽗉ed 󽗉re suppression
facilities, such as 󽗉re󽗉ghting sands and 󽗉re extinguishers.
Caution
Batteries should be used soon after being deployed onsite. Batteries that have been
stored for an extended period should be recharged periodically. Otherwise, they may be
damaged.
Caution
Only trained and quali󽗉ed personnel are allowed to recharge batteries. Wear insulated
gloves and use dedicated insulated tools during the operation.
Caution
Observe onsite during recharge and handle any exceptions in a timely manner.
Caution
If a battery experiences an abnormality such as bulging or smoking during recharge, stop
charging immediately and dispose of it.
※ 8.2 Storage Duration Overdue and Recharge
Do not store batteries for extended periods. Otherwise, the battery performance and
service life may be a󽗈ected.
· The total storage and transportation time of the battery packs cannot exceed six months
(starting from manufacture date or the latest charge date).
If it exceeds six months, discharge the battery to 0% SOC and then charge to 30% SOC.
If it exceeds twelve months, discharge the battery to 0% SOC, then charge to 100% SOC
and 󽗉nally discharge to 30% SOC.
· Dispose of deformed, damaged, or leaking batteries directly irrespective of how long
they have been stored.
in irregular storage.

38 39
※ 9.1 Maintenance
Danger
Risk of battery damage or personal injury due to incorrect service!
Caution
Keep non-quali󽗉ed persons away!
Attention
Restart the battery only after removing the fault that impairs safety performance.
Never arbitrarily replace any internal components.
For any maintenance support, please contact Sunways. Otherwise, Sunways shall not be
held liable for any damage caused.
Note
Servicing of the device in accordance with the manual should never be undertaken in
the absence of proper tools, test equipment or the latest revision of the manual which
has been clearly and thoroughly understood
Maintenance of electrical components:
Item Project Checkpoint Methods Repair Condition Repair Solution
1 Electrical
Check whether the
voltage output is
normal.
Multi-mete
The battery voltage
exceeds the preset
range Contact the
dealer or
manufacturer.
2Failure to
check
Check whether the light
is normal.
Visual
inspection Warning
9 Troubleshooting
3 Cable Insulation, terminal Visual
inspection
Insulation crack,
aging, the terminal is
peeling or corroded.
Replace the
cable,
replace the
terminal board.
Item Frequency Project Solution
1
Every month
Working environment Keep away from heat sources and direct sunlight.
1 Visual inspection
If there is damage, leakage or deformation, isolate
the faulty battery pack, take photos and replace
the battery.
2
Every quarter
Visual inspection Clean appearance with cotton cloth. Be careful
when cleaning.
2 Connection status
Check each terminal for loose bolts and tighten
again.
Check the cable temperature.
3Half a year Measure and record
voltage
Collect discharge data at least once every six
months in the 󽗉rst year.
In the second year, discharge data were collected
every three months. Check the historical records
through the RS232 port. If the alarm information
shows that the battery is frequently overcharged,
the battery has reached the charging and
discharging protection point. This may lead
to insu󽗋cient time for power preparation.
It is recommended to replace the battery
immediately.
Battery Maintenance:
※ 9.2 Troubleshooting
If any battery fault occurs, record the fault information, shut down the battery according
to the shutdown procedure, and contact the distributor or Sunways. Do not handle the
fault by yourself.