Sunways STT Series User manual

User Manual
Ningbo Sunways Technologies Co., Ltd.
Grid-connected PV Inverter
Three Phase Six MPPT
STT-50K/60KTL

1.Preface .......................................................................................................................5
1.1 Overview ......................................................................................................5
1.2 Target Groups ..............................................................................................5
2.Safety Instructions ...............................................................................................5
2.1 Safety Notes ................................................................................................5
2.2 Statement ....................................................................................................5
2.3 Important Safety Matters ...........................................................................6
2.4 Symbols Explanation ..................................................................................7
3. Product Introduction .........................................................................................9
3.1 Basic Features .............................................................................................9
3.2 Appearance Introduction .........................................................................10
3.3 Display Interface .......................................................................................12
3.4 Packing list.................................................................................................13
4. Product Installation ..........................................................................................13
4.1 Selection of Installation Location ............................................................13
4.2 Mounting the Inverter ...............................................................................15
4.3 Electrical Connection ...............................................................................17
4.4 Monitoring Device Installation .................................................................21
4.5 RS485 Communication Connection ........................................................22
5.Start and Stop ......................................................................................................24
5.1 Inverter start-up ........................................................................................24
5.2 Inverter shutdown ....................................................................................24
6.General Operation ..............................................................................................25
6.1 Display Operation .....................................................................................25
7.Troubleshooting ..................................................................................................26
7.1 Fault Messages ..........................................................................................26
8.Technical Parameters ........................................................................................27
CONTENTS

Attention
The products, services or features you purchase are subject to the commercial contracts and
terms of Ningbo Sunways technologies Co., Ltd. All or part of the products, services or features
described in this document may not be within your purchasing or using scope. 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.
5
Manufacturer: Ningbo Sunways technologies Co., Ltd.
Address: No. 1, Second Road, Green Industrial Zone, Chongshou Town,
Cixi City, ZheJiang Province, PEOPLE’S REPUBLIC OF CHINA
Website: www.sunways-tech.com
Service Mail: [e-mail]
Hotline: [phone]
1.Preface
1.1 Overview
This manual is an integral part of Sunways STT50-60kW series three-phase inverters
(hereinafter referred to as the inverters). It mainly introduces the assembly, installation,
electrical connection, debugging, maintenance and troubleshooting of the products. Before
installing and using inverters, please read this manual carefully, understand the safety
information and be familiar with the functions and characteristics of inverters.
1.2 Target Groups
This manual is applicable to the electrical installers with professional quali󽗉cations and the
people who bought this inverter. If there are any problems in the installation process, please
call Sunways service telephone at [phone] or email Sunways at service@sunways-
tech.com for consultation.
2.Safety Instructions
2.1 Safety Notes
2.1.1 Before installation, you should read this manual carefully and follow the instructions in
this manual strictly.
2.1.2 Installation operators need to undergo professional training or obtain electrical related
professional quali󽗉cation certi󽗉cates.
2.1.3 When installing, do not touch any part of the inner part of the inverter except the
terminals.
2.1.4 All electrical installations must conform to local electrical safety standards.
2.1.5 If the inverter needs maintenance, please contact the local designated personnel for
system installation and maintenance.
2.1.6 To use this grid-connected inverter for power generation needs the permission of the
local power supply authority.
2.1.7 During the operation of the inverter, the surface temperature may be higher and there is
a risk of burns. Do not touch.
2.1.8 When installing photovoltaic panels in the daytime, the photovoltaic panels should be
covered with opaque materials to avoid the risks and danger of high voltage at the panel end
in sunlight.
2.2 Statement
Ningbo Sunways technologies Co., Ltd. has the right not to undertake quality assurance in any
of the following circumstances:
2.2.1 Damages caused by irregular transportation.

6 7
2.2.2 Damages caused by incorrect storage, installation or use.
2.2.3 Damages caused by installation and use of equipment by non-professionals or untrained
personnel.
2.2.4 Damages caused by failure to comply with the instructions and safety warnings in the
products and documents.
2.2.5 Damages caused by running in an environment that doesn't meet the requirements
which stated in the documents.
2.2.6 Damages caused by operation beyond the parameters speci󽗉ed in applicable technical
speci󽗉cations.
2.2.7 Damages caused by unauthorized disassembly, alteration of products or modi󽗉cation of
software codes.
2.2.8 Damages caused by abnormal natural environment (force majeure, such as lightning,
earthquake, 󽗉re, storm, etc.).
2.2.9 Any damages caused by the process of installation and operation which unable to follow
the local standards and regulations.
2.2.10 Products beyond the warranty period.
2.3 Important Safety Matters
The following symbols may appear in this manual, which represent the following meanings:
Danger
Warning
Caution
Used to warn of urgent dangerous situations, if not avoided, it
could result in death or serious personal injury.
DescriptionSymbol
Used to warn of potentially dangerous situations, if not
avoided, it may result in death or serious personal injury.
Used to warn of potentially dangerous situations, if not
avoided, it may result in moderate or minor personal injury.
Attention
Used to transmit the safety warning information about
equipment or environment, if not avoided, it may cause
equipment damage, data loss, equipment performance
degradation or other unpredictable results. "Attention" does
not involve personal injury.
Note Used to highlight important information, best practices and
tips, etc.
2.4 Symbols Explanation
This chapter mainly elaborates the symbols displayed on the inverter, nameplate and packing
box.
2.4.1 Symbols on the Inverter
A fault occurred if the red light is on, please report it to the
installer or manufacturer as soon as possible.
DescriptionSymbol
Inverter running indicator.
Grounding symbol, the inverter casing needs to be properly
grounded.
2.4.2 Symbol on the Inverter nameplate
The inverter cannot be disposed of with household waste.
DescriptionSymbol
Please read the instructions carefully before installation.
Do not touch any internal parts of the inverter until 5 min after
being disconnected from the mains and PV input.
CE mark, the inverter complies with the requirements of the
applicable CE guidelines.
Danger. Risk of electric shock!
TUV certi󽗉cation.
The surface is hot during operation and no touch is allowed.
Electric shock hazard, it is strictly forbidden to use the person
to disassemble the inverter casing.

Figure 3-1 Applicable grid type
98
Handle with care.
DescriptionSymbol
This side up.
Keep dry.
Stacked layers.
2.4.3 Symbol on the Packing box 3. Product Introduction
3.1 Basic Features
3.1.1 Function
The Sunways STT 50~60kW series is a three-phase grid-connected PV inverter which is used to
e󽗋ciently convert the DC power generated by the PV string into AC power and feed it into the
grid.
3.1.2 The STT 50~60kW series inverter contain 2 models which are list below: STT-50KTL,
STT-60KTL.
3.1.3 Applicable grid type
The applicable grid types for the Sunways STT50~60kW series are TN-S, TN-C, TN-C-S, IT and
TT. When applied to the TT grid, the voltage of N to PE should be less than 30V. See Figure 3-1
for details:
3.1.4 Storage conditions
1) Inverter must be stored in its original packaging.
2) The storage temperature should be in the range of -30 ° C and + 60 ° C, and the relative
humidity stored is less than 90%.
3) If a batch of inverters needs to be stored, the height of each pile should be no more than 2
levels.

Figure 3- 2 Front view
Figure 3- 3 Side view
3.2.2 Inverter side view, as shown in Figure3-3:
10
580mm
850mm
LOGO Display
580mm
297mm
Figure 3-4 Bottom view
Figure 3-5 Inverter back
3.2.3 Inverter bottom view, as shown in Figure 3- 4:
3.2.4 Inverter back view, as shown in Figure 3- 5:
11
Back Rail
Back Rail
Back Rail
Back Rail
3.2 Appearance Introduction
3.2.1 Inverter front view, as shown in Figure 3- 2:
Name
Plate
DC Switch
DC Switch
DC Input Terminal
Com Port
AC Output Terminal
297mm

Item Indicator Status Description
1Power
Indicator
O󽗈 No input voltage detected or input voltage is too
low.
Slow 󽗊ashing Inverter powered on, waiting for the grid
connection.
Quick 󽗊ashing Inverter detected grid power and entered self-test
status.
Always on Normal, grid-connected and power generated.
2Alarm
Indicator
Always on An alarm or fault is detected, and the display can
view the speci󽗉c fault information.
O󽗈 The inverter is running normally.
Slow 󽗊ashing The monitoring device is not connected to the
router or is not connected to the base station.
Quick 󽗊ashing
The monitoring device is connected to the router
or connected to the base station but not
connected to the server.
3OLED
Display
On Display the inverter operating information.
O󽗈 If the button pressed without any response, the
screen is faulty or not well connected.
4 Button Physical
button
Switch OLED display information and set
parameters by short press and long press.
3.3 Display Interface
Figure 3-6 Display interface
12
3.3.1 Displayinterface, as shown in Figure 3- 6
Figure 3- 7 Packing list
Monitoring Device
(Optional) × 1
Ground Terminal × 1
13
Ring Spanner × 1
Back Bracket × 1Inverter × 1 PV Terminal × 12
M10
Bracket Screw × 6
AC Terminal × 5
3.4 Packing list
The packaging of the inverter includes the following accessories. Please check whether the
accessories in the packing box are complete at the 󽗉rst time when receiving the goods. See
Figure 3-7 for the packing list:
Inspection Report
Quick Guide
Grid Licence
User Manual × 1
Quick Guide × 1
Inspection Report × 1
Grid Connection Licence × 1
4. Product Installation
4.1 Selection of Installation Location
The Sunways STT 50~60kW series is designed with IP65 protection for indoor and outdoor
installations. When selecting an inverter installation location, the following factors should be
considered:
1)The object used for mounting the inverter must be strong and can withstand the weight of
the inverter for a long time.
2) The inverter needs to be installed in a well-ventilated environment.
3) Do not expose the inverter directly to strong sunlight to prevent the power derating due to
excessive temperature.
4) The inverter should be installed in a place with shelter to prevent direct exposure to sunlight
and rain.
5) Install the inverter at the eye level for easy inspection of screen data and further
maintenance.
6) The ambient temperature of the inverter installation location should be between -30 ° C and
60 ° C.
7) The surface temperature of the inverter can reach up to 75 ° C. To avoid risk of burns, do
not touch the inverter while it’s operating and inverter must be installed out of reaching of
children.
4.1.1 Recommended installation location of the inverter, as shown in Figure 4-1:
sunways

4.1.2 The requirements for inverter installation spacing are shown in Figure 4-2:
4.1.3 The installation angle of the inverter is recommended as shown in Figure 4-3:
Figure 4-2 Recommended installation space
Figure 4-3 Recommended installation angle
14
500mm
500mm
500mm500mm
15°
4.2 Mounting the Inverter
4.2.1 Wall bracket installation
Dimensions of wall bracket, see Figure 4-4:
1) Use the inverter back bracket as the template to mark the position of 6 holes on installation
bracket.
2) Use an electrical driller with 12mm diameter bit to drill 6 holes on the installation bracket.
See Figure 4-5 for details:
Figure 4-4 Dimensions of wall bracket
Figure 4-5 Mark the hole position
15
12mm
Figure 4-1 Recommended installation location
Do not put 󽗊ammable and explosive articles around the inverter.
Warning
383mm
568mm
284mm 284mm
26mm
568mm

Figure 4-6 Fix the wall bracket
Figure 4-7 Mounting the inverter
3) Follow the instructions in the picture below to install the M10 assembling bolts (bolt, spring
washer, 󽗊at washer) and tighten the bolts with torque wrench in the torque of 35-40N.m, see
Figure 4-6 for details:
4) Lift up the inverter with both hands, hang the back rail on the 󽗉xed back bracket carefully,
see Figure 4-7 for details:
16
Handle
Handle
4.3.1 Inverter PV string connection
4.3.1.1 The following principles must be considered when making electrical connections to the
inverter:
1) Disconnect the AC breaker on the grid side.
2) Two DC switches at the bottom of the inverter must be turned to the "OFF" position.
3) The number and type of the PV modules connected in series in each string in a same MPPT
must be same.
4) Make sure the maximum output voltage of each PV string does not exceed 1100V.
4.3.1.2 DC connector assembly procedure
1) Select the appropriate photovoltaic cable according to the table below:
2) Strip o󽗈 the DC cable insulation sleeve for 7 mm, as shown in Figure 4-8:
Cable type Conductor transverse area（mm²）
General photovoltaic cable
Scope(mm²) Recommended value
（mm²）
2.5-4.0 4.0
Figure 4-8
Wire transverse area 2.5-4mm27mm
17
4.3 Electrical Connection
Danger hint
A high voltage in the conductive part of the inverter may cause an
electric shock. When performing any installation on the inverter,
make sure that the AC and DC sides of the inverter are completely
de-energized.
Do not ground the positive or negative pole of the PV string, otherwise
it will cause serious damage to the inverter.
Static may cause damage to the electronic components of the
inverter. Anti-static measures should be taken during the repairing or
installation.
Do not use other brands or other types of PV terminals other than the
PV terminal in the accessory package. Sunways has the right to refuse
all damages caused by the mixed-use of terminals.
Moisture and dust can damage the inverter, ensure the cable gland
is securely tightened during installation. The warranty claim will be
invalided if the inverter damaged by the cable connector not well
installed.
Danger
Warning
Attention
Attention
Warning

Crimping Plier
Figure 4-9
Figure 4-11
3) Disassemble the connector in the accessory bag, as shown in Figure 4-9:
5) Insert the positive and negative cables into the corresponding positive and negative
connectors and pull back the DC cable to ensure that the terminal is tightly attached in the
connector.
6) Screw the nut to the end with some power and ensure the terminal is well sealed, as
shown in Figure 4-11:
Figure 4-10
4) Insert the DC cable through the DC connector nut into the metal terminal and press the
terminal with a professional crimping plier (pull back the cable with some power to check if
it’s tight enough), as shown in Figure 4-10:
18
+
-
Figure 4-13
Model STT-50KTL-CN STT-60KTL-CN
Cable 16mm225mm2
AC breaker 100A 125A
4.3.2 Connection of AC output
The Sunways STT 50~60kW series three-phase inverter applies to the three-phase power grid
with a voltage of 380/400V and a frequency of 50/60Hz. The ceiling limit of AC output normal
working voltage and frequency are 110% UN and 50.5Hz.
The recommended AC cable and breaker for the Sunways STT50~60kW series three phase
inverter are shown in the following table:
4.3.2.1 AC connector connection steps
1) According to the recommendations in above table to select an appropriate copper cable,
strip the insulation sleeve of AC cable o󽗈 for 150mm, and strip the end of 3L /PE / N wires o󽗈
for 8mm, then put the 5 AC terminals onthe stripped metal cores respectively and tighten
them with hydraulic clamp,as shown in Figure 4-13:
19
Figure 4-12
7) Insert the positive and negative connectors into the inverter DC input terminals respectively,
and a "click" sound represents the assembly in place, as shown in Figure 4 -12:
150mm
Strip Length:8mm
L1
L2
L3
PE
N
1.Before assembling the DC connector, make sure that the cable
polarity is correct.
2.Use a multimeter to measure the voltage of the DC input string, verify
the polarity of the DC input cable, and ensure that each string voltage
is within 1100V.
Warning
An AC breaker must be connected on the AC side of the inverter.
Any loads cannot be directly connected to the inverter.
Warning
Open-end Wrench

Figure 4-15
Figure 4-16
3) Put the AC cable through the cable gland and use a screwdriver to lock all 󽗉ve cables (L1/L1/
L3/N/PE) to the correspondingly AC connector and pull back them with some power to make
sure they’re well connected. As shown in Figure 4-15:
4) Put back the right roof cover and lock with its original screws. As shown in Figure 4-16:
Figure 4-14
2) Take out the ring spanner from the accessory box and remove the right roof cover after
unscrewed the screws on it, as shown in Figure 4-14:
20
If there’re more than one inverter in a project, do not open all inverters
roof cover at the same time if you cannot 󽗉nish the AC connection
immediately. Any damages caused by the moisture and dust that came
into the inverter on account of exposed to the air for a long time are
out of Sunways warranty.
Attention
21
4.4 Monitoring Device Installation
Sunways STT 50~60kW series three-phase inverter supports WiFi, GPRS and RS485
communication, you can choose any of them according to your needs.
Plug the WiFi or GPRS module into the COM port in the bottom of inverter by following the
direction that the side with indicator is up (as shown in Figure 4-18). A slight “click” sound
during the installation represents that the assembly is in place.
Ground terminal connection steps:
1) The external grounding terminal is located in the lower right side of the inverter.
2) Fix the grounding terminal to the PE wire with a hydraulic clamp and lock the grounding
terminal to the grounding hole in the inverter. As shown in Figure 4-17:
3) The transverse area of the external grounding is 16mm².
Figure 4-17 Grounding terminal connection
4.3.3 External ground connection
Do not connect the N-wire as a protective ground wire to the inverter
casing. Otherwise, it may cause electric shock.
Good grounding is good for resisting surge voltage shock and
improving EMI performance. Inverters must be well-grounded.
For a system with only one inverter, just ground the PE cable.
For a multi-inverter system, all inverters PE wire need to be connected
to the same grounding copper bar to ensure equipotential bonding.
Danger
Attention

Figure 4-18 Monitoring device installation
4.5 RS485 Communication Connection
STT 50~60kW series three-phase inverter supports multiple inverters connection to a data
logger BlueLog in a daisy chain mode through RS485 protocol. Customers can check their
inverters real-time power, warnings and status through the App “Linked Solar” or Sunways
monitoring system (monitor.sunways-tech.com) anytime anywhere.
Multiple inverters connection diagram as shown in Figure 4-19:
22
4.5.1 RS485 Communication cable connection
Inverter RS485 communication port schematic diagram, as shown in Figure 4-20:
The maximum distance between the inverter at the end of the daisy chain and the Blue'Log
should be within 1000M.
Figure 4-20 RS485 communication port schematic diagram
1 3
2
4
Figure 4-19 Multiple inverters connection diagram
23
1.The GPRS version module does not need to be con󽗉gured.
2.The WiFi version module needs to be con󽗉gured to the router for
the 󽗉rst installation, and if the router name or password changed,
you need to con󽗉gure it again. For details, please refer to the [QUICK
INSTALLATION GUIDE] which attached in the accessory bag.
Don't touch the waterproof plug in the card slot unless replace the
SIM card. If the SIM card needs to be replaced, please make sure the
card slot iscompletely sealed by waterproof plug after replacing. Any
damages caused by the waterproof plug sealing problem will be invalid
of warranty.
Attention
Note

Ma i n Wi nd ow
Wa iting C he cki ng Normal
Pac Error Code
P v V ol ta g e
P v Cu r re n t
E-DAY E-TOTAL H-TOTAL M o de l Na me General Set
Ret ur n
Ma i n Wi nd ow
SysI nfo
FM Version
WIFI
Reset
WIFI
R el oad
Safety Set
S afe ty Co de
Power L imit P F S et
History
Error Code
RSSI
Time Set Language Set
SNError MessageS et ti ngS et ti ngS et ti ng
XXX%
S et ti ng S et ti ng S et ti ng S et ti ng
Short press(1s),switch window
Long press(3s),enter the lower Menu Firmware
Updating
Tip:After every set ting completed, wait for 10 s ec o nds a nd t he in ver te r wi ll a u tom a ti cal ly save y o ur set ti ng s or mo di fi cat io ns.
G ri d Vo lt ag e
G ri d C urr en t
G ri d Fr equ en t
PowerLimit
OFF
PowerLimit
ON
NOT WI FI
G ri d C onne ct
Type Set
Four/Three
Wire System
Modbus
Addres s Set
1-247
5.Start and Stop
5.1 Inverter start-up
When starting the inverter, follow these steps:
1) Turn on the AC breaker 󽗉rst.
2) Turn on the two DC switches in the bottom. If the PV string voltage higher than the inverter
start-up voltage, the inverter will start.
3) When both AC and DC power supply are normal, the inverter is ready to start. The inverter
will initiate from checking its internal parameters and grid parameters, if it’s within the range,
the green light on the left side of the screen begins to 󽗊ash, and the “Waiting” message will be
displayed on the OLED display.
4) After 30 seconds, the inverter will start generating electricity, the green light will remain on,
and the OLED display will display real-time power information.
5.2 Inverter shutdown
When turning o󽗈 the inverter, please follow the steps below:
1) Turn o󽗈 the AC breaker 󽗉rst.
2) Wait 30 seconds and then turn the two DC switches to the “OFF” position. At this time, there
is remaining power in the inverter capacitor. Wait for 5 minutes until the inverter is completely
de-energized before operating.
3) Disconnect the AC and DC cables.
Suggest to use the communication cable with the transverse area of 0.2-1.5mm² and outer
diameter of 5mm-10mm.
Figure 4-21 RS485 communication port de󽗉nition
1 3
2
4
No Port De󽗉nition Description
1 RS485 1 RS485 1, Di󽗈erential signal +
2 RS485 2 RS485 2, Di󽗈erential signal -
3 RS485 3 RS485 3, Di󽗈erential signal +
4 RS485 4 RS485 4, Di󽗈erential signal -
RS485 cable requirements: Shielded twisted-pair cable or shielded
twisted Ethernet cable.
Attention
24
6.General Operation
6.1 Display Operation
When the inverter is turned on, the following interfaces will be displayed on the OLED display,
and you can check the information and modify the parameters of the inverter by short or long
pressing the button. Please refer to the following display operation 󽗊ow for details:
25

7.Troubleshooting
7.1 Fault Messages
Sunways STT50~60kW series three-phase inverter is designed in accordance with grid
operation standard, and conform to the requirements of the safety and EMC. The inverter had
passed a series of rigorous tests to ensure it runs sustainably and reliably before shipment.
When a fault occurs, the corresponding fault messages will display on the OLED display, and in
this case, the inverter might stop feeding into grid.
The fault messages and their corresponding troubleshooting methods are listed below:
26
Model STT-50KTL STT-60KTL
DC Input
Start-up Voltage (V) 200 200
Max. DC Input Voltage (V) 1,100 1,100
Rated DC Input Voltage (V) 620 620
MPPT Voltage Range (V) 200~950 200~950
Full Power MPPT Voltage Range (V) 390~850 470~850
No. of MPP Trackers 6
No. of DC Inputs 12
Max. Input Current (A) 22/22/22/22/22/22
Max. Short-circuit Current (A) 30/30/30/30/30/30
Backfeed current to the array (A) 0
AC
Output
Rated Output Power (KW) 50 60
Max. Output Power (KW) 55 66
AC output rated apparent power(KVA) 50 60
Max. Apparent Power (KW) 55 66
Rated Output Voltage (V) 3/N/PE，230/400V
Rated AC Frequency (Hz) 50/60
AC output rated current（A） 72.5 87
Max. Output Current (A) 83.6 95.3
The measured Inrush current (A) [email protected] [email protected]
Maximum output fault current (A) 180 180
Maximum output overcurrent protection（A） 180 180
Power Factor 0.8 leading …0.8 lagging
Max. Total Harmonic Distortion <3% @Rated Output Power
DCI <0.5%In
8.Technical Parameters
27
Error Message Solution
Mains Lost 1. Check whether the mains supply is lost.
2. Check whether the AC breaker and terminal are well connected.
Grid Voltage Fault
1. Check whether the impendence of the AC cable is too high to lead the grid
voltage increased. Change a thicker AC cable if it is.
2. Extend the voltage protection range if it is allowed by the electricity
company.
Grid Frequency Fault
1. Check whether the AC cable is correct and well connected.
2. Change to another country with wider protection range if it's allowed by
the local electricity company.
DCI Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
ISO Over Limitation 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
GFCI Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
PV Over Voltage Reduce the number of PV panels to make sure the open-circuit voltage of
each string is lower than the verter max allowed input voltage.
Bus Voltage Fault 1. Check whether the input voltage is over the limitation.
2. Seek for help from the installer or manufacture.
Inverter Over Temperature 1. Check whether the input voltage is over the limitation.
2. Seek for help from the installer or manufacture.
SCI Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
SPI Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
E2 Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
GFCI Device Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
AC Transducer Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
Relay Check Fail 1. Restart the inverter.
2. Seek for help from the installer or manufacture.
Flash Fault 1. Restart the inverter.
2. Seek for help from the installer or manufacture.

Model STT-50KTL STT-60KTL
E󽗋ciency
Max. E󽗋ciency 98.8% 98.8%
European E󽗋ciency 98.3% 98.3%
MPPT E󽗋ciency 99.9% 99.9%
Protection
DC Reverse Polarity Protection Integrated
Insulation Resistance Protection Integrated
DC Switch Integrated
Surge Protection Integrated
Over-temperature Protection Integrated
Residual Current Protection Integrated
Anti-islanding Protection Frequency shift, Integrated
AC Short-circuit Protection Integrated
AC Over-voltage Protection Integrated
General
Data
Dimensions (mm） 850W*520H*290D
Weight (KG) 58
Protection Degree IP65
Self-consumption at Night (W) <1
Topology Transformer-less
Operating Temperature Range (° C) -30~60
Relative Humidity 0~100%
Operating Altitude (m） 3000
Cooling Smart Fan Coolling
Noise Level (dB) <55
Display OLED & LED
Communication RS485, WiFi/ GPRS/LAN(Optional)
Compliance NB/T 32004、IEC62109、IEC62116、VDE 4105、VDE 0126、AS4777、RD1699、NBR16149、IEC61727、
IEC60068、IEC61683、EN50549、EN61000
28
S11-00008-00 V1.01-EN
Address: No. 1, Second Road, Green Industrial Zone, Chongshou Town,
Cixi City, ZheJiang Province, PEOPLE’S REPUBLIC OF CHINA
Website: www.sunways-tech.com
Service Mail: [e-mail]
Hotline: [phone]