SAJ Sunfree 4K User manual

Sunfree Series
- 0 -
User Manual
SAJ Hybrid Solar Inverter
Sunfree Series
www.saj-electric.com

Sunfree Series
- 1 -
Preface
Thank you for choosing an SAJ hybrid solar inverter. We are pleased to
provide you with first-class products and exceptional service.
This manual includes information for installation, operation, maintenance,
trouble shooting and safety. Please follow the instructions of this manual
so that we can ensure delivery of our professional guidance and
wholehearted service.
Customer-orientation is forever our commitment. We hope this document
proves to be of great assistance in your journey for a cleaner, greener
world.
Please check for the latest version at www.saj-electric.com
Guangzhou Sanjing Electric Co., Ltd.
Zero-Carbon Innovator

Sunfree Series
- 2 -
Content
Preface.................................................................................................... - 1 -
Chapter 1 Safety Precautions .............................................................. - 4 -
1.1 Scope of Application ............................................................................... - 4 -
1.2 Safety Instructions................................................................................... - 4 -
1.3 Target Group............................................................................................- 5 -
Chapter 2 Preparation .......................................................................... - 6 -
2.1 Safety Instructions................................................................................... - 6 -
2.2 Explanations of Symbols......................................................................... - 8 -
Chapter 3 Product Information.......................................................... - 10 -
3.1 Application Scope of Products .............................................................. - 10 -
3.2 Specification for Product Model ........................................................... - 11 -
3.3 Overview and Dimensions of products ................................................. - 11 -
3.4 Datasheet ............................................................................................... - 12 -
Chapter 4 Instructions for installation ............................................... - 14 -
4.1 Safety Instructions................................................................................. - 14 -
4.2 Pre-installation Check ........................................................................... - 14 -
4.3 The Determination of the Installation Method and Position................. - 16 -
4.4 Mounting Procedure.............................................................................. - 18 -
Chapter 5 Electrical Connection........................................................ - 20 -
5.1 Safety Instruction for Hot-line Job........................................................ - 20 -
5.2 Specifications for Electrical Interface................................................... - 21 -
5.3 AC input wire Connection..................................................................... - 22 -
5.4 Backup Output Connection ................................................................... - 23 -
5.5 PV Connection....................................................................................- 25 -
5.6 Battery connection ................................................................................ - 28 -

Sunfree Series
- 3 -
5.7 Communication Connection.................................................................. - 29 -
Chapter 6 Debugging Instructions ..................................................... - 31 -
6.1 Introduction of Human-computer Interface ..........................................- 31 -
6.2 First Run Setup...................................................................................... - 32 -
6.3 Monitoring Operation and Battery manage system ..............................- 55 -
Chapter 7 Fault Code and Troubleshooting....................................... - 56 -
Chapter 8 Recycling and Disposal .................................................... - 60 -
Chapter 9 Guarantee Service............................................................. - 61 -
Chapter 10 Contact SAJ..................................................................... - 62 -
SAJ Warranty Policy .......................................................................... - 63 -
Warranty Card ...................................................................................... - 67 -

Sunfree Series
- 4 -
Chapter 1 Safety Precautions
1.1 Scope of Application
This User Manual describes instructions and detailed procedures for installing,
operating, maintaining, and troubleshooting of the following SAJ hybrid solar
inverters:
Sunfree 5K, Sunfree 4K, Sunfree 5K-HC, Sunfree 4K-HC,
Please keep this manual all time available in case of emergency.
1.2 Safety Instructions
DANGER
· DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING
· WARNING indicates a hazardous situation which, if not avoided, can result in death or
serious injury or moderate injury.
CAUTION
· CAUTION indicates a hazardous condition which, if not avoided, can result in minor or
moderate injury.
NOTICE
· NOTICE indicates a situation that can result in potential damage, if not avoided.

Sunfree Series
- 5 -
1.3 Target Group
Only qualified electricians who have read and fully understood all safety
regulations contained in this manual can install, maintain and repair the inverter.
Operators must be aware of the high-voltage device.

Sunfree Series
- 6 -
Chapter 2 Preparation
2.1 Safety Instructions
DANGER
· There is possibility of during to electrical shock and high voltage.
· Do not touch the operating component of the inverter, it might result in burning or death.
· To prevent risk of electric shock during installation and maintenance, please make sure
that all AC and DC terminals are plugged out.
· Do not touch the surface of the inverter while the housing is wet, it might lead to electrical
shock.
· Do not stay close to the inverter while there are severe weather conditions including storm,
lighting, etc.
· Before opening the housing, the SAJ inverter must be disconnected from the grid and PV
generator; you must wait at least five minutes to let the energy storage capacitors fully
discharged after disconnecting from power source.
WARNING
·The installation, service, recycling and disposal of the inverters must be performed by
qualified personnel only in compliance with national and local standards and regulations.
·Any unauthorized actions including modification of product functionality of any form may
cause lethal hazard to the operator, third parties, the units or their property. SAJ is not
responsible for the loss and these warranty claims.
·The SAJ inverter must only be operated with PV generator. Do not connect any other
source of energy to the SAJ inverter.
·Be sure that the PV generator and inverter are well grounded in order to protect properties
and persons.
CAUTION
·The inverter will become hot during operation. Please do not touch the heat sink or
peripheral surface during or shortly after operation.
·Risk of damage due to improper modifications.
·Risk of damage due to improper modifications.

Sunfree Series
- 7 -
NOTICE
·Public utility only.
·The PV inverter is designed to feed AC power directly to the public utility power grid; do
not connect AC output of the inverter to any private AC equipment.

Sunfree Series
- 8 -
2.2 Explanations of Symbols
Symbol Description
Dangerous electrical voltage
This device is directly connected to public grid, thus all work to the inverter shall
only be carried out by qualified personnel.
DANGER to life due to high electrical voltage!
There might be residual currents in inverter because of large capacitors. Wait 5
MINUTES before you remove the front lid.
NOTICE, danger!
This is directly connected with electricity generators and public grid.
Danger of hot surface
The components inside the inverter will release a lot of heat during operation. Do
not touch metal plate housing during operating.
An error has occurred
Please go to Chapter 9 “Troubleshooting” to remedy the error.
This device SHALL NOT be disposed of in residential waste
Please go to Chapter 8 “Recycling and Disposal” for proper treatments.
Without Transformer
This inverter does not use transformer for the isolation function.
Security Certificate
The inverter complies with European product safety instructions.
CE Mark
Equipment with the CE mark fulfills the basic requirements of the Guideline
Governing Low-Voltage and Electro-magnetic Compatibility.
SAA Mark
The inverter complies with the requirement of Equipment and Product Safety Act in
Australia.

Sunfree Series
- 9 -
CQC Mark
Equipment standard with China Quality Inspection Center safety directive.
No unauthorized perforations or modifications
Any unauthorized perforations or modifications are strictly forbidden, if any
defect or damage(device/person) is occurred, SAJ shall not take any
responsibility for it.

Sunfree Series
- 10 -
Chapter 3 Product Information
3.1 Application Scope of Products
Sunfree series products are hybrid solar inverters without transformers, and the
inverters are important components of energy storage systems.
The Sunfree inverters change the DC generated by solar panels into AC which is in
accordance with the requirements of public grid and send the AC into the grid,
Reduce the load pressure of the grid.
When the grid failure, provide 230V AC source to supply important loads,
achieve off-grid backup power supply function.
Figure3.1 Sunfree series application

Sunfree Series
- 11 -
3.2 Specification for Product Model
Sunfree 5k -HC
①②③
①Sununo Plus represents for product name.
②XK represents rated power XkW of inverter, for example 5K means 5kW.
③HC represents the inverter has the function of high charge current.
3.3 Overview and Dimensions of products
The dimensions of Sununo Plus series products is shown in Figure 3.2.
C
Sunfree 4K/5K/4K-HC/5K-HC
Figure 3.2 Dimensions of Sunfree series Products

Sunfree Series
- 12 -
3.4 Datasheet
Sunfree 4K/5K specification sheet
MODEL Sunfree 4K Sunfree 5K
DC Input Data
Max. PV Array Power [W] 4200 5200
Maximum PV Array Open Circuit Voltage [v] 580
MPPT Range @ Operating Voltage [v] 90～550
Start Voltage [v] 120
Min. DC Voltage [v] 80
Max. DC Input Current PV1/PV2[A] 11 / 11
Number of DC Connection/MPPT Tracker
Number 2 / 2
DC Switch Integrated
Battery Data
Battery Type Li-ion battery / Lead-acid battery
Battery Voltage/Range of Voltage [v] 48 / 42～58
Maximum/Rated Charge Current [A] 50 / 50
Min. Battery Capacity [AH] 100
Charging Curve 3-Stage Adaptive With Maintenance / 3-Stage
Adaptive With Maintenance
Grid-Tie Operation
Rated Output Power [W] 36801 / 4000 4600² / 5000
Rated Output Current [A] 16 / 17.4 20 / 21.7
Rated Grid voltage/Range [v] 220V，230V，240V / 180V～280V
Rated Grid Frequency / Range [Hz] 50Hz / 60 Hz ± 5 Hz
Power Factor >0.99
Total Harmonic Distortion (THDi) <3%
AC Output Data
Rated Output Power 36801W/ 4000VA 4600²W/ 5000VA
AC Voltage Regulation [v] 230 ± 1%
Rated Output Frequency Regulation [Hz] 50 ± 0.02
Total Harmonic Distortion (THDi) <5%（non-linear load）；<3%（Linear load）
Overload（Batt. Mode）6000VA(150% 10s) 7500VA(150% 10s)
Overload（Grid. Mode）6000VA(150% 1min) 7500VA(150% 1min)

Sunfree Series
- 13 -
Efficiency
Max. Efficiency 97.60%
Euro Efficiency 97.00%
MPPT Adaptation Efficiency >99.5%
Protection
AC Short Circuit Protection Integrated
Overload Protection Integrated
DC Voltage High/Low Protection Integrated
AC Voltage High/Low Protection Integrated
AC Frequency High/Low Protection Integrated
High Temperature Protection Integrated
Anti-islanding protection Integrated
Valley Peak Period Selection Integrated
Interface
PV Connection Type MC4/H4
Battery Connection Type Terminal Block
AC Connection Type Terminal Block
Display LCD
Communication RS485*2& RS232（Integrated）；Wi-Fi / GPRS /
Ethernet（Optional）
General Data
Topology Transformerless
Protection Degree IP65
Ambient Temperature Range -25～60℃（45～60℃derating）
Relative humidity 0～100%（No Condensing）
Max. Operating Altitude 2000m
Noise emision <25dB
Cooling method Nature convection
Dimensions（W×H×D）470mm*470mm*200mm
Weight 30kg
Certification CE & VDE & SAA
Standard Warranty 5 Years
1.Meet the grid standard that AC current per phase not exceeding 16A.
2.Meet the VDE - ARN - N 4105 that biggest apparent power of single-phase is 4600 VA.

Sunfree Series
- 14 -
Chapter 4 Instructions for installation
4.1 Safety Instructions
DANGER
· Dangerous to life due to potential fire or electricity shock.
· Do not install the inverter near any inflammable or explosive items.
· This inverter will be directly connected with HIGH VOLTAGE power generation device;
the installation must be performed by qualified personnel only in compliance with national
and local standards and regulations.
NOTICE
· This equipment is suit for the pollution degree II.
· Inappropriate or the harmonized installation environment may jeopardize the life span of
the inverter.
· Installation directly exposed under intensive sunlight is not recommended.
· The installation site must be well ventilated.
4.2 Pre-installation Check
4.2.1 Check the Package
Although SAJ’s inverters have surpassed stringent testing and are checked before
they leave the factory, it is uncertain that the inverters may suffer damages during
transportation. Please check the package for any obvious signs of damage, and if
such evidence is present, do not open the package and contact your dealer as soon as
possible
4.2.2 Check the Assembly Parts
After opening the package, please refer to Table 4.1 and 4.2 to check the
completeness of the assembly parts. Please contact your dealer if anything is
damaged or missing.

Sunfree Series
- 15 -
A B C D E
F G H I
Table 4.1 Assembly Parts List
Object Name Number Unit Remarks
A Inverter 1 Set
B Rear Panel 1 Piece
C DC Connector 2 Pair
D M6×50 hex head screw 3 Piece
E Expansion tube 3 Piece
F M5×12 hex head screw
and gasket 2 Piece
G AC connector 1 Piece
H H4 Splitter 1 Piece
I User Manual 1 Copy
Table 4.2 Quantity of Assembly Parts and Instructions

Sunfree Series
- 16 -
4.3 The Determination of the Installation Method and Position
4.3.1 Mounting Method
Figure 4.1 Mounting Method
(1) The equipment employs natural convection cooling, and it can be installed
indoor or outdoor.
(2) Please install the equipment under the guidance of Figure4.1. Vertical
installation on floor level is recommended. Mount vertically or tilted backwards by
max. 15°. Never install the inverter tilted forwards, sideways, horizontally or
upside down.
(3) Install the inverter at eye level for convenience when checking the LCD display
and possible maintenance activities.
(4) When mounting the inverter, please consider the solidly of wall for inverter,
including accessories. Please ensure the Rear Panel tightly.
Before installation, make sure that the wall has enough strength to hold the screws
and bear the weight of the equipment, Please make sure the equipment is installed
properly.

Sunfree Series
- 17 -
4.3.2 Installation Position
Do not expose the inverter to direct solar irradiation as this could cause power
derating due to overheating. The ambient temperature should be between -25°C ～
+60°C（-13° F ～140° F）（This temperature range is not equivalent to the
temperature range required by the battery pack）to ensure optimum operation.
Choose locations with sufficient air exchange. Ensure additional ventilation, when
necessary.
To make sure the installation spot is suitably ventilated, if multiple SAJ grid-tie
hybrid solar inverters are installed same area, the following safety clearance in
Figure 4.2 shall be followed for proper ventilation conditions.
50CM
30CM
50CM
30CM
30CM
Figure 4.2 Minimum Clearance

Sunfree Series
- 18 -
4.4 Mounting Procedure
4.4.1 Mark the Positions of the Drill Holes of the Rear Panel
The mounting position should be marked as shown in Figure 4.3.
Figure 4.3 Dimensions of rear panel of Sunfree inverter
4.4.2 Drill Holes and Place the Expansion Tubes
According to the guides, drill 4 holes in the wall (in conformity with position marked
in Figure 4.4, and then place expansion tubes in the holes using a rubber mallet.
260
100
Ø8
Figure 4.4 Drill holes dimensions of Sunfree inverter

Sunfree Series
- 19 -
4.4.3 Mount the Screws and the Rear Panel
The panels should be mounted in the mounting position by screws as shown in
Figure 4.5.
Figure 4.5 Mount the Rear Panel of Sunfree inverter
4.4.4 Mount the Inverter
Carefully mount the inverter to the rear panel as shown in Figure 4.6, Make sure
that the rear part of the equipment is closely mounted to the rear panel.
Figure 4.6 Mount Sunfree inverter