SRNE ML 4830, ML 4830-LI, ML 2440, ML 2440-LI solar charge controller User Manual
Below you will find brief product information for solar charge controller ML 4830, solar charge controller ML 4830-LI, solar charge controller ML 2440, solar charge controller ML 2440-LI. The SRNE ML series solar charge controller is a robust and reliable device designed to optimize solar panel output for efficient battery charging. It features advanced MPPT technology, allowing you to maximize the energy you can harvest from your solar panels. This device supports various battery types, including lead-acid, gel, and lithium batteries. It also incorporates multiple protection features to safeguard your system against potential problems. The ML series can be customized to meet various system demands, thanks to its advanced digital power technology and LCD screen for user-friendly parameter viewing and adjustments.
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Material Code:1.1.24.01419
Maximum Power Point
Tracking ML Series
ML4830 & ML4830-LI & ML2440 & ML2440-LI
Solar Charge and Discharge Controller
User Manual
Model
Battery Voltage
Max Solar Input Voltage
Charging Current
Discharging Current
ML4830/ML4830-LI
12V/24V/36V/48V
150V
30A
20A
ML2440/ML2440-LI
12V/24V
150V
40A
20A
Note: ML4830-LI and ML2440-LI can be used for lithium battery charging and discharging management.
Version: 1.01
The above information is subject to change without prior notice.
Dear user:
Thank you for choosing our product !
Safety Instructions
1. Since the adaptable voltage of the solar charge controller exceeds human safety voltage, you are advised to read instructions before operation and operate the solar charge controller after completing safe operation training.
2. There are no parts that need maintaining or repairing inside the solar charge controller. Users shall not disassemble or repair the controller by themselves.
3. Please install the solar charge controller indoors, avoid exposure of components, and prevent water from entering the controller.
4. Please install the solar charge controller in a well-ventilated place, for the temperature of the cooling fin can be very high during operation.
5. You are recommended to install appropriate insurance or circuit breaker outside the solar charge controller.
6. Before installing or adjusting the connecting wire of the solar charge controller, make sure that the photovoltaic array wire and insurance or circuit breaker near battery terminal are disconnected.
7. After installation, check whether all line connections are solid. Bad connections may cause hazards due to heat accumulation.
Warning: indicates risky operation. Security preparation is required before operation.
!
Note: indicates destructive operation.
Tip: indicates advice and tips for the operator.
01
Catalog
1. Product Introduction
1.1 Product Overview and Features
1.2 Product Features
1.3 Introduction of the Maximum Power Point Tracking Technology
1.4 Introduction of Charging Stages
2. Product Installation
2.1 Installation Precautions
2.2 Wiring Specifications
2.3 Installation and Wiring
3. Product Operation and Display
3.1 LED Indicator
3.2 Buzzer
3.3 Key Operation
3.4 LCD Starting and Main Interface Display
3.5 Load Mode Setting Page
3.6 System Analysis Page
3.7 System Log Page
3.8 Parameter Setting Interface
3.9 Production Information Page
4. Product Protection Function and System Maintenance
4.1 Protection Function Introduction
4.2 System Maintenance
4.3 Abnormality Display and Alarm
5. Product Specification Parameter
5.1 Electrical Parameter
5.2 Parameter Adjustment Range
6. Conversion Efficiency Curve
7. Product Size
03
03
04
04
06
07
07
08
12
15
16
17
18
08
11
11
12
12
21
21
22
23
19
19
19
20
20
24
02
1. Product Introduction
1.1 Product Overview and Features
The solar charge controller can monitor generated power of solar panels in real time and track the highest voltage current value (VI), enabling the system to charge the battery with maximum power output. Applied to solar off-grid photovoltaic systems, the product coordinates the functions of solar panels, batteries and loads; and is the core control unit of off-grid photovoltaic systems.
The controller uses liquid crystal for the dynamic display of operation status, operating parameters, controller logs, historical parameters, and control parameters. Users can check all parameters through buttons, and modify control parameters according to actual needs so that different system requirements are met.
The controller adopts standard Modbus communication protocol, making it easy for users to view and modify system parameters by themselves. We provide free monitoring software, which delivers the greatest possible convenience for users to satisfy different needs of remote monitoring.
The inside of the solar charge controller is equipped with comprehensive electronic fault self-detecting function and powerful electronic protection function, therefore avoiding damage to product components resulting from installation errors and system faults to the greatest extent.
Product Features
Advanced double-peak or multiple-peak tracking technology. When the panel has a shadow block or a part of the panel is damaged, I-V curve shows multiple peaks. The solar charge controller can still accurately track the maximum power point.
Built-in algorithm for maximum power tracking. This significantly raises energy utilization efficiency of photovoltaic systems, with charging efficiency 15% ~ 20% higher than traditional PWM solar charge controllers.
Combination of multiple tracking algorithms that can track the optimum working point of I-V curve accurately in a very short period of time.
MPPT tracking efficiency can be as high as 99.9%.
Advanced digital power technology, with circuit energy conversion efficiency as high as 98%.
Supporting charging procedures of gel batteries, sealed batteries, open batteries, lithium batteries and other types of batteries.①
Current-limiting charging mode. When the power of a solar panel is too large, and the charging current is greater than rated current, the solar charge controller automatically reduces charging power, thereby making the solar panel work at rated charging current.
Supporting the start of capacitive load instantaneous large current.
Supporting automatic identification of battery voltage.
LED indicator of malfunction, buzzer alarm, and liquid crystal display of abnormal information. This helps users identify system failures.
Supporting historical data storage for up to 5 years.
LCD screen display function. The display enables users to view equipment operation data and status, and modify controller parameters at the same time.
Supporting standard Modbus protocol that meets communication needs on different occasions.
Built-in mechanism of over-temperature protection. When the temperature exceeds the preset value, the charging current falls linearly with temperature, therefore slowing down the rise of controller temperature and avoiding controller damage from high temperature.
External battery voltage sampling function. This function prevents line loss from affecting external battery voltage sampling and ensures greater preciseness of, control parameters.
Temperature compensation functions. Charging and discharging parameters are automatically adjusted, thereby extending battery service life.
TVS lightning protection.
Note①:Only the ML-LI model supports lithium battery charging and discharging function.
03
1.2 Product Features
Figure 1-1 Solar Charge Controller Appearance and Interface
4
5
6
No.
1
2
3
7
8
9
Name
Charging Indicator
Battery Indicator
Load Indicator
Abnormality Indicator
Liquid Crystal Display
Operation Button
Mounting Hole
Solar Panel “+” Interface
Solar Panel “-” Interface
No.
10
11
12
13
14
15
16
17
Name
Battery “-” Interface
Load “-” Interface
Battery “+” Interface
Load “+” Interface
External Temperature Sampling Interface
External Battery Voltage Sampling Interface
RS485 Communication Interface
RS232 Communication Interface
1.3 Introduction of the Maximum Power Point Tracking Technology
The Maximum Power Point Tracking (MPPT) system is an advanced charging technology that enables solar panels to output more power by adjusting the working state of electrical modules. Due to the nonlinearity of a solar array, there is a maximum energy output point (maximum power point) on the curve of the array. Traditional solar charge controllers (switch charging technology and PWM charging technology) cannot charge batteries at this point, thus unable to obtain the maximum energy of solar panels. However, the solar energy charge controller equipped with the MPPT control technology can track the maximum power point of a solar array at any time in order to gain maximum energy for battery charging.
Take the 12V system for example. The peak voltage of solar panels (Vpp) is around 17V and battery voltage is about 12V. Generally, when the solar charge controller is charging a battery, the voltage of solar panel is maintained at about 12V, indicating that the maximum power is not used. MPPT solar charge controllers provide a solution to that problem by constantly adjusting the input voltage and current of solar panels, therefore maximizing input power.
04
Compared with conventional PWM solar charge controllers, MPPT solar charge controllers bring out the maximum power of solar panels and provide greater charging current. Generally speaking, MPPT solar charge controllers can improve energy utilization rate by 15% ~ 20% over PWM solar charge controllers.
I ( A )
VP Curve
VI Curve
P( W )
5. 0
4. 5
4. 0
3. 5
3. 0
2. 5
2. 0
1. 5
1. 0
0. 5
PWM
Charging
MPPT
94. 5
81. 0
0. 0 2. 8 5. 6 8. 4 11. 2 14. 0 16. 8 19. 6
Figure 1-2 Solar Panel Output Characteristic Curve
0. 0
U ( V )
67. 5
54. 0
40. 5
27. 0
13. 5
Moreover, different environmental temperatures and light conditions lead to frequent changes of the maximum power point. Our MPPT solar charge controller can constantly adjust parameters according to different conditions so as to put the system near the maximum working point all the time. The whole process is completely automatic without any adjustment by users.
I ( A)
I (A)
Sunlight reduces and current reduces
Temperature reduces, current remains constant, and power increases
20℃
30℃
40 ℃
50℃
60℃
70℃
Sunlight reduces and open circuit voltage reduces
U( V )
U ( V)
Temperature increases and open circuit voltage reduces
Figure 1-3 Solar Panel Output
Characteristic and Lighting Relation
Figure 1-4 Solar Panel Output
Characteristic and Temperature Relation
05
1.4 Introduction of Charging Stages
As a stage of charging, MPPT cannot be used separately, but must be combined with charging modes such as boost charging, floating charging and equalizing charging to complete battery charging together. A complete charging process includes: fast charging, maintaining charging and floating charging. The charging curve is as follows:
Battery
Voltage
A
Bulk Charging
Equalize
Boost
Float
Recharge
B
Constant Charging
C
Float Charging
B ul k
Boost
Time
Battery
Voltage
Max
Current
Duration Time:2h
(Range:10~180min)
Cumulative Time:3h
Figure 1-4 Battery Charging Stage
Time
Fast Charging
In fast charging stage, battery voltage is below the preset value (equalizing/boost voltage) of full voltage. The solar charge controller will perform MPPT charging and provide the maximum solar power to charge battery. After battery voltage reaches the preset value, the controller conducts constantvoltage charging.
Maintaining Charging
When battery voltage reaches the preset value for maintaining voltage, the solar charge controller performs constant-voltage charging, and this process does not involve MPPT charging. At the same time, charging current declines gradually over time. There are two stages in maintaining charging, which are equalizing charging and boost charging. The two charging processes are not repeated processes. Equalizing charging is started once every 30 days in a month.
Boost Charging
The boost charging stage generally lasts 2 hours by default. Customers can adjust the duration and preset value of boost voltage according to actual needs. When the duration times reaches the preset value, the system enters floating charging stage.
06
Equalizing Charging
Warning: explosion!
Balance opening lead-acid batteries may produce explosive gas, and cabins of the batteries must be well ventilated.
Attention: equipment damage!
!
Balance can push up battery voltage to a level that may damage sensitive DC load.
Verification is required to ensure that the allowed input voltage of all system loads is higher than the set value of equalizing charging for batteries.
Overcharging or too much gas evolution may damage battery plates and cause active materials on battery plates to fall off. Damages may be caused if equalizing charging voltage is too high or equalizing charging lasts too long. You are advised to carefully read the specific requirements on batteries used in the system.
Some types of batteries benefit from regular equalizing charging, which can stir up electrolyte, equalizing battery voltage, and complete chemical reaction. Equalizing charging boosts battery voltage to a level higher than standard complement voltage, resulting in gasification of battery electrolyte. If it is detected that the solar charge controller automatically controls the next process to perform equalizing charging, equalizing charging duration will be 120 minutes
(default). Equalizing charging and boost charging are not repeated in one full charge process.
This is to avoid too much gas evolution or battery overheating.
Attention:
!
When the system cannot maintain battery voltage steadily at constant voltage due to installation environment or operation with load, the solar charge controller performs time accumulation until battery voltage reaches the preset value. After the cumulative time reaches three hours, the system automatically transfers to floating charging.
If the clock of the solar charge controller is not calibrated, the controller performs regular equalizing charging in accordance with its internal clock.
Floating Charging
After a charging stage continues, the solar charge controller reduces battery voltage by decreasing the charging current, and maintains battery voltage at the preset voltage value for floating charging.
At floating charging stage, the battery undergoes very weak charging to ensure that the battery is in full charge state. At floating charging stage, the load can obtain nearly all the solar power. If the load exceeds the power provided by solar energy, the solar charge controller fails to maintain battery voltage at floating stage. When battery voltage is as low as the preset value for improved recovery charging, the system exits from floating charging stage and re-enters fast charging stage.
2.
Product Installation
2.1 Installation Precautions
Exert great caution during battery installation. Before installing open lead-acid battery, wear protective goggles. When you are in contract with battery acid liquid, wash the involved part with water immediately.
Do not place metal objects near battery to prevent short circuit.
When battery is charging, acidic gas can be produced. Ensure that the environment around is well ventilated.
Battery may generate combustible gas. Keep it away from sparks.
For outdoor installation, avoid direct sunlight and rain infiltration.
07
Loose connections and corrosive wires may cause extreme heat that melts wire insulation layers, burns surrounding materials, or even results in fire. Ensure that connection heads are screwed tight, and wires are better fixed with tightening belts. Avoid wire shaking and loose connection heads when moving the application.
When the system is connected, the output terminal voltage of components can be higher than human safety voltage. During operation, use insulated tools and make sure your hands are dry.
The battery terminals on the solar charge controller can be connected with one battery or the same set of batteries. Follow-up instructions in the manual apply to the use of single battery. The same instructions apply to a system with a set of batteries as well.
Please follow battery manufacturers' safety recommendations.
System connecting line is selected according to current density of no greater than 4A/mm2.
Connect the solar charge controller grounding terminal to the ground.
2.2 Wiring Specifications
Wiring and installation mode must comply with national and local electrical standard requirements.
Battery and load specifications must be selected according to the rated current. Refer to the following table for wiring specifications:
Model
ML4830
Rated Charging Current
30A
ML2440 40A
Rated Discharging Current
20A
20A
Battery Wire Diameter
8 mm
2
Load Line Diameter
5 mm
2
10 mm
2 5 mm
2
2.3 Installation and Wiring
Warning: Explosion risk. Do not install the solar charge controller and open type cell in the same closed space. Do not install in closed place where battery gas may gather.
≥150mm
Warning: High pressure danger. Photovoltaic array may generate very high open circuit voltage. Before wire connection, disconnect the breaker or insurance. Be careful in the process of wiring.
!
Attention: When installing a solar charge controller, make sure there is enough air flowing through the cooling fin of the controller. Leave a space of at least 150 mm up and down the solar charge controller to ensure natural heat loss through convection. If installed within a closed cabinet, ensure reliable heat dissipation through the cabinet body.
≥150mm
Hot Air
Cold Air
Figure 2-1 Installation and
Heat Dissipation
08
Step 1: Selecting an installation location.
Avoid installing solar charge controller in a place where there is direct sunlight, high temperature or easy water inflow. Ensure the surrounding area of the solar charge controller is well ventilated.
Step 2:
First place installation guide plate at proper position, then use pen and mark on installation location, drill four installation holes at marked places of suitable size, and fixe with screw.
Step 3: Fix the solar charge controller.
On the installation surface, use a pen to mark the positions of four mounting holes, and then move away solar charge controller. Drill four size-suitable mounting holes at four marked positions, and fix screws in advance, align fixing holes of solar charge controller to on the four fixed screws, and then hang it up.
Figure 2-2
Fix the solar charge controller
Step 4: Wiring
Remove the two screws on the solar charge controller panel, and then start wiring. For installation security, we recommend the following wiring sequence. However, wiring without following this order will not damage the solar charge controller.
4
3
7
2
1
Figure 2-3 Wiring
09
5
6
①
External temperature sampling interface connection
②
Battery voltage sampling line connection
③
Communication cable connection
④
Connect power line
Warning: Risk of electric shock! We strongly recommend access insurance or circuit breaker at photovoltaic array end, load end and battery end, to prevent electric shock from occurring during wiring or misoperation. Before wiring, ensure that insurance or circuit breaker is disconnected.
Warning: High pressure danger! Photovoltaic array may generate very high open circuit voltage.
Before wire connection, disconnect the breaker or insurance. Be careful in the process of wiring.
Warning: Risk of explosion. Short circuit of battery positive and negative terminals and wires connected to them will cause fire or explosion. Please be careful during operation.
Please connect battery first, then connect load, and finally connect the solar panel, please follow the connection mode of "+" first and then "-".
⑤
Power On
Tip: ML series solar charge controller only starts the solar charge controller via wiring at the battery end, but ML - LI can start the solar charge controller via power of PV array,. This applies to starting the solar charge controller and activating lithium battery when lithium battery BMS is in the protection state and cannot export electricity externally.
When all the power line connections are firm and reliable, recheck whether the wiring is correct, and whether positive and negative ends are connected reversely. After confirmation, connect battery fuse or circuit breaker, observe whether LED indicator is lit, and whether LCD screen displays content. If there is no display, disconnect the fuse or circuit breaker immediately and recheck whether the circuit connection is correct.
If battery is powered on normally, connect the solar panel. If solar charge controller charging indicators are on normally or flashing, start battery charging.
When battery and photovoltaic is well connected, then connect load fuse or circuit breaker. At this time, you can use manual mode to test whether the load On and Off is normal. See load working mode and operation.
Warning: When the solar charge controller is under normal charging state, disconnecting battery connection will affect solar charge controller DC load. In a severe case, the load can be damaged.
Warning: Within 10 minutes after solar charge controller charging stops, battery reverse polarity operation may damage internal components of the solar charge controller.
!
Attention:
1) Battery insurance installation site should be as close as possible to the battery end.
Recommended installation distance shall be no more than 150 mm.
2
) When solar charge controller is not connected to a remote temperature sensor, battery temperature is a fixed value of 25
℃.
3) If the inverter is connected in the system, please connect inverter directly with battery, and do not connect solar charge controller with the load end.
⑥
Close wiring cover
When all wirings of the system are well connected, close the wiring cover and screw screws tight.
10
3. Product Operation and Display
3.1 LED Indicator
PV array Indicator Indicate solar charge controller current charging mode
BAT Indicator
LOAD Indicator
Indicate battery current state.
Indicate load switch and state.
ERROR Indicator Indicate whether solar charge controller is currently normal working.
NO .
①
②
③
④
PV array Indicator
Graph
⑤
⑥
Indication State
Charging State
Steady On
Slow Flash (On 1s, Off 1s, cycle 2s)
MPPT Charging
Boost Charging
Floating Charging Single Flash (On 0.1s, Off 1.9s, cycle 2s)
Fast Flash
(On 0.1s, Off 0.1s, cycle 0.2s) Equalizing Charging
Double Flash
(On 0.1s, Off 0.1s, On 0.1s, Off 1.7s, cycle 2s)
Current
Limited Charging
Off Night
BAT Indicator
Indication State
Steady On
Battery State
Battery Voltage Normal
Slow Flash(On 1s, Off 1s, cycle 2s)
Battery Over-Discharge
Fast Flash(On 0.1s, Off 0.1s, cycle 0.2s)
Battery Overvoltage
LOAD Indicator
Indication State
Off
Battery State
Load Not Started
Fast Flash(On 0.1s, Off 0.1s, cycle 0.2s)
Overload/Short Circuit
Steady On
Load Normal Output
11
ERROR
Indicator
Indication State
Off
Steady On
Battery State
System Operation No Abnormalities
System Abnormal
3.2 Buzzer
After abnormality occurs, the buzzer sends out two short and a long buzzing sound.
Buzzer Buzzing State
Off
Abnormality Type
System no abnormalities or buzzing for 1 minute and then stop
Buzzing for 1 minute
Battery Over-Discharge, Under-Voltage, Load Short Circuit,
Over-Load, Solar Controller Over-Temperature, and Battery
Over-temperature
Buzzing for 15 seconds
Battery Under-Voltage
Constant Buzzing Battery Overvoltage, PV Reverse Connection, PV Overvoltage
3.3 Key Operation
Up
Down
Menu page up; parameter decrease under setting mode
Menu page down; parameter increase under setting mode
Return to the previous menu
Return
Confirm
Enter submenu; Setting/Save key
3.4 LCD Starting and Main Interface Display
Starting Interface
S t a r t i n g . . .
M o d e l : S R
- x x x x x x x
A U T O
V O L T A G E
1 2
2 4 3 6 4 8
12
During start, the four indicators flash in flow. LCD starts after self-check. The model of the solar charge controller is displayed first, and then battery voltage level is displayed. Voltage level is displayed according to user-selected fixed voltage or voltage automatically identified.
Main Page
Main page has 8 menus, in which menus with sub menus can press setting key to enter next menus
NO.
Page name
①
Charging Page Display
②
③
Discharging Load
Information Display Page
Load Mode Setting Page
④
Manual switch load page
⑤
⑥
⑦
⑧
System Analysis Page
System Log Page
Parameter Setting Page
Product Information
Page Note
Charging state information real-time display, which can display information of solar panel voltage, charging state, charging current, battery voltage, and charging power
Load state information real-time display, which can display information of battery voltage, load switch state, discharging current, environment temperature, and discharging power
Sub-menu
Load work mode adjustment page
Yes
The page is available only when load mode is manual mode 15, not displayed in other modes. In this page, load can be turned on and off from keys directly.
System analysis page can view charging AH, discharging AH, work days, and system abnormality information
Log page can view solar controller historical information up to 5 years at most, including daily min battery voltage, battery max voltage, daily charging AH, and daily discharging AH, and etc
Parameter settings page can set some parameters of solar controller, including charging voltage, discharging voltage, temperature compensation coefficient, communication baud rate, and etc
Product information can view solar controller serial number and version information
Yes
Yes
Yes
Yes
① Charging Page Display
Solar Panel Voltage Charging State Charging Current
1 8 . 0 V M P P T
2 0 . 0 A
1 2 . 0 V
2 4 0 W
C H R G
Battery Voltage Charging Power
② Discharging Display Page
Battery Voltage
Load On/Off State
Charging Page Indicator
Discharging Current
1 2 . 0 V
O
N
- 1 0 ℃
1 2 2 W
1 0 . 0 A
L
O A D
Environment Temperature Discharging Power Discharging Page Indicator
13
③ Load Mode Setting Page
L O A D
L i g h t + 0 0 H
M O D E
S E L
④ Switch load page
(can be seen when load mode is manual mode 15)
T u r n
L o a d
O F F
( H o l d
2
s e c )
⑤ System Analysis Page
D i a g n o s t i c s
M e n u s
S E L
⑥ System Log Page
L o g g e d
M e n u s
D a t a
S E L
⑦ Parameter Setting Page
S y s t e m
M e n u s
S e t t i n g s
S E L
⑧ Product Information
P r o d u c t
M e n u s
I n f o
S E L
14
3.5 Load Mode Setting Page
Load Mode Introduction
The solar controller has five load work modes,with modes referred as follows:
Code
0
Mode
Pure light control
(light on at night, off during daytime)
1~14
Light time control for
1~14 hours
15
16
17
Manual Mode
Debugging Mode
Normal Open Mode
Description
When there is no sunlight, the solar panel voltage is below the light control ON voltage, solar charge controller will open load after delay for a certain time, when the sunlight appears, solar panel voltage is above light control OFF voltage, solar charge controller will shut down the load after delay for a certain time
When there is no sunlight, the solar panel voltage is below the light control ON voltage, solar charge controller will open load after delay for a certain time, load will shut down after working time reaches set value.
Under this mode, the user can control load On and Off through keys, regardless of daytime or night. This mode is used in some special load situations or used for debugging.
Used for system debugging, close the load when there is light signal, open load when there is no light signal, convenient for checking the correctness of the system installation during installation and debugging.
Power-on load has always maintained output state. This mode is suitable for load needing 24 hours power supply.
Load Mode Adjustment
The user adjusts load mode according to needs. The debugging mode is set by default (see Load
Mode Introduction). Mode adjustment method goes as follows:
Step
① Enter Load Mode Page
L O A D
L i g h t
+
M O D E
1 6
S E L
Step
②
Short press the setting key to enter mode adjustment interface
S E T
L i g h t
L O A D
+
1 6
M O D E
S E L
Step ③ Long press the setting key for 3 seconds
Load mode will flash at this time
S E T
L i g h t
L O A D
+
1 6
M O D E
S E L
Step
④
Press the +/- key to set needed load mode
S E T
L i g h t
L O A D
+
1 7
M O D E
S E L
15
Step ⑤ Long press setting key to save and exit
Setting is successful
S E T
L i g h t
L O A D
+
1 7
M O D E
S E L
Manual Switch Load Page
The page is available only when load mode is manual mode 15. When load in under manual mode, load can be turned on and off from following pages manually
Long press the setting key for 2 seconds to turn load on, page displays as follows:
T u r n
L o a d
O N
( H o l d
2 s e c )
Long press the setting key for 2 seconds to turn load off, page displays as follows:
T u r n
L o a d
O F F
( H o l d
2 s e c )
3.6 System Analysis Page
In system analysis page, the user can user charging AH, discharging AH, work days, and system abnormality information, convenient for user to know the working condition of the whole system.
D i a g n o s t i c s
M e n u s
S E L
In this page, press setting key to enter system analysis sub menu page, with page contents as following table 3-6
5
6
3
4
No.
1
2
7
8
Displaying Items
Total Charge WH
Total Charge AH
Total Dischg WH
Total Dischg AH
Total Work Days
Total LVD Times
Total FUL Times
Error Code
Controller temp
Notes
Total Charge WH
Total Charge AH
Total Dischg WH
Total Dischg AH
Total Work Days
Total LVD Times
Total FUL Times
Error Code
Controller temp
Table
3-6
Unit
KWH (
度)
KAH
KWH (
度)
KAH
Days
Times
Times
℃
16
3.7 System Log Page
Log View of Current Day
Some system operation information record can be viewed at system log page, can view data records of five years at most, see Table 3-7 for information contents
L o g g e d
M e n u s
D a t a
S E L
In this page, press setting key to enter system log sub menu page, which is current day’s log data by default, with page contents as following table 3-7
3
4
5
No
.
1
2
6
7
8
9
10
Log Contents
Battery current day min voltage
Battery current day max voltage
Current day max charging current
Current day max discharging current
Current day max charging power
Current day max discharging power
Current day charging AH
Current day discharging AH
Current day generating capacity
Current day discharging capacity
Table 3-7
Unit
V
V
A
A
W
W
AH
AH
KWH
KWH
Log View of Different Days
To view log data of n days ago, the user needs to set a specified date. The setting is as follows:
Step
① : Long press setting key for 3 seconds in current log parameter
D
A Y:
2 2
. 0 V
0 0 0
M
Days value start to flash at this time,
000 refers current days i n
B
A T T E R Y
S E L
D
A Y:
2 2
. 0 V
0 0 0
M i n
B
A T T E R Y
S E L
17
Step ②
: Press the +/- key to set the number of days
001 refers to value of previous day
D
A Y:
2 2
. 0 V
0 0 1
M i n
Step ③
: Long press the setting key for 3 seconds, and save current days
At this time, press +/- key again to view other log contents of set days
D
A Y:
2 6
. 0 V
0 0 1
M a x
B
A T T E R Y
S E L
B
A T T E R Y
S E L
3.8 Parameter Setting Interface
Under this menu, the user can view and set system parameters. Setting shall be performed under guidance of professional personnel; otherwise, setting error may cause system problems. See table 3-8 For parameter setting contents
No.
Displaying Items
1 TYPE OF BAT
4
5
2
3
CAP OF BAT
VOLT OF SYS
OVR VOL DISC
CHG LMT VOL
6
7
8
9
EQUALIZ CHG
BOOST CHG
FLOAT CHG
BOOST-RE CHG
10
11
LOW VOL RECT
UND VOL WARN
12 LOW VOL DISC
13
14
DISC LMT VOL
LVD DELAY
15
16
17
18
EQUALIZ TIME
BOOST TIME
AUTO EQUALIZ
T-COMP SLOPE
19
20
L-CON-VOL
L-CON-DELAY
Parameter Setting Contrast Table
Notes Parameter Scope
Default
Paremeters
Sealed
Battery Type
User/flooded/Sealed/Gel
Battery Capacity
100
~3000AH 200AH
System Voltage
12V/24V/36V/48V/AUTO AUTO
Overvoltage Voltage
16.0V
Charging Limit Voltage
15.5V
Equalizing charging Voltage
15.2V
Boost charging Voltage
14.4V
Floating Charging Voltage
9.0
~17.0V
13.8V
Boost charging Recovery to Voltage
9.0
~17.0V
12.6V
Over-Discharge Recovery
12.6V
Under-Voltage Warning
12.0V
Over-Discharge Voltage
11.0V
Over-Discharge Limit Voltage
10.5V
Over-Discharge Delay Time
5s
Equalizing Charging Duration Time
120Min
Boost Charging Duration Time
Equalizing Charging Interval
Temperature Compensation Coefficient
~ ( equalizing charging function)
~ ( compensation function)
Light Control Voltage
120Min
30D
-3mv/
℃/2V
5V
Light Control Delay Time
21
22
23
24
BAUD RATE
MODBUS ADDR
RS232 ADDR
BACK-LIGHT
Communication Baud Rate
Modbus Address
RS232 Address
Back-Light Delay Time
25 RESTORE DEFAVLT Restore Factory Default Setting
1200-115200
1-250
1-65530
Steady on
/10-60Sec
5Min
9600
1
1
10Sec
Table3-8
(All parameters can be set and viewed under User)
18
3.9 Production Information Page
You can check the controller model, serial number, software and hardware version etc. to learn about the product. For detailed information, please see Table 3-9
No.
1
2
3
Name
Model
Serial Number
Hardware version
Item
Model:
HW:
SW:
System Information
Parameter Example
ML4830
15100032
00.05.00
Example Note
Solar charge controller model
The 32nd set of October 2015
Hardware version V0.5.0
4 Software version Serial: 00.03.00
Software version V0.3.0
Table
3-9
4. Product Protection Function and System Maintenance
4.1 Protection Function Introduction
Waterproof Protection
Waterproofing Grade
:
IP32
Input limit power protection
When solar panel power exceeds the rated power, the solar charge controller limits solar panel power within
the scope of rated power to prevent damage of the controller by excessive current, The solar charge controller enters current limit charging.
Battery Reverse connection protection
When storage system is connected reversely, the system does not work and does not burn out solar charge
controller.
Photovoltaic input terminal voltage too high
Photovoltaic array input voltage is too high, and solar charge controller will automatically cut off PV input.
Photovoltaic input terminal Short circuit protection
After short circuit of photovoltaic array input terminal, the solar charge controller disconnects charging, and when short circuit condition is removed, charging will be automatically restored.
PV input reverse connection protection
When polarity of photovoltaic array is connected reversely, the solar charge controller will not be damaged, and will continue normal operation after correcting wiring error.
Warning: During reverse connection, battery voltage together with component element voltage must be less than 150V.
Load over-power protection
When load exceeds the rated power, delayed load over-power protection will be started according to actual circumstances.
Load short circuit protection
Provide timely and fast protection for short circuit of load, and try to start load automatically after a certain delay. The maximum number per day is 5 times. When load short circuit occurs, the user can also remove load short circuit manually in system data analysis page exception code.
Night reverse connection proof protection
At night, prevent battery discharging via solar panel.
TVS Lightning Protection
Over-Temperature Protection
With temperature higher than the set temperature, the solar charge controller reduces charging power or stops charging. See the following figure
19
Chg-P :/%
100%
95%
85%
80%
75%
65%
60%
55%
45%
40%
35%
25%
20%
15%
5 %
0
0 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
Tem-MOS :/ ℃
4.2 System Maintenance
To maintain the best and long-term performance, it is recommended that following items are checked each year.
Confirm that air flow around the solar charge controller is not blocked. Remove any dirt or debris on the cooling fin.
Check whether insulation of bare wires is damaged due to sunburn, friction with other objects around, dry rot, insects or rodents destruction. Check whether repairing or wire replacement is necessary.
Verify that indicators are consistent with equipment operation. Please pay attention to any fault or error displays, and take corrective actions when necessary.
Check all wiring terminals to see if there is corrosion, insulation damage, high temperature or burning /discoloration signs, and tighten screw terminal.
Check whether there are dirt, nest-building insects and corrosion phenomenon, and clean by following requirements.
If lightning arrester has failed, timely replace invalid lightning arrester to prevent causing lightning damage to solar charge controller or even user’s other equipments.
Warning: Risk of electric shock! In process of above operation, make sure all power supply of the solar charge controller has been disconnected, and then conduct related check or actions accordingly!
4.3 Abnormality Display and Alarm
No.
Error Display
1 PV REV
2
3
PV OVP
PV_MPP_OVP
Remarks
Photovoltaic Modules Inversed
Connection
Photovoltaic Modules
Overvoltage
Over Set Vmp Voltage
LED Indication
ERROR indicator steady on
ERROR indicator steady on
Buzzer Alarm
Buzzer keeps alarming
Buzzer keeps alarming
ERROR indicator steady on
Buzzer Alarm for 1Min
4
5
6
7
9
11
12
13
PV OVER CRT
OVER VOLTAGE
LOAD SHORT CRT
LOAD OVER CRT
OVER TMP BAT
OVER TMP MOS
OVER DISCHARGE
Photovoltaic Modules Overload ERROR indicator steady on
System Overvoltage
Load Short Circuit
Overload
BAT Indicator fast flash
ERROR indicator steady on
LOAD Indicator fast flash
ERROR indicator steady on
LOAD Indicator fast flash
ERROR indicator steady on
Environment Temperature
Over-Temperature
Solar Charge Controller Internal
Over-Temperature
ERROR indicator steady on
ERROR indicator steady on
Battery Over-Discharge
BAT Indicator slow flash
ERROR indicator steady on
Buzzer Alarm for 1Min
Buzzer keeps alarming
Buzzer Alarm for 1Min
Buzzer Alarm for 1Min
Buzzer Alarm for 1Min
Buzzer Alarm for 1Min
Buzzer Alarm for 1Min
BAT UND VOL WARN Battery Under-Voltage
ERROR indicator steady on
Buzzer Alarm for 15 seconds
20
5. Product Specification Parameter
5.1 Electrical Parameter
Parameter Name
Model
System Voltage
No-Load Loss
Battery Voltage
Max Solar Energy Input Voltage
Max Power Point Voltage Scope
Rated Charging Current
Rated Load Current
Max capacitive load capacity
PV System Max Input Power
Conversion Efficiency
MPPT Tracking Efficiency
Temperature compensation coefficient
Working Temperature
Protection Level
Weight
Max Wiring Size
Communication Mode
Altitude
Product Size
Parameter Value
ML2440/ ML2440-LI
12V/24V Auto
ML4830/ ML4830-LI
12V/24V/36V/48V Auto
0.7 W ~ 1.2W
9
~ 35
<150V
Battery Voltage
+2V ~ 120V
9
~ 70
40A 30A
20A
10000uF
520W/12V
1040W/24V
≤98%
>99%
-3mv/ ℃/2V(Default)
-35℃ ~ +45℃
IP32
2.3Kg
25 mm
2
RS485, RS232
≤ 3000m
226*182*81mm
400W/12V
800W/24V
1200W/36V
1600W/48V
5.2 Parameter Adjustment Range
Setting Voltage
Battery Type
Overvoltage
Disconnect Voltage
Equalizing Voltage
Boost Voltage
Floating Voltage
Boost Restoring
Voltage
Low Voltage Disconnect
Restoring Voltage
Under-Voltage Alarming
Restoring Voltage
Under-Voltage
Alarming Voltage
Low Voltage
Disconnect Voltage
Discharging Limit
Voltage
Over-Discharge
Delay Time
Equalizing Duration
Time
Comparison Table of Parameters for Each Type of Battery
Sealed Lead-Acid
Battery
Gelled Lead-Acid
Battery
Open Lead-Acid
Battery
User (User-Defined)
16.0V
14.6V
16.0V
——
16.0V
14.8V
9 ~ 17V
9 ~ 17V
14.4V
13.8V
13.2V
12.6V
14.2V
13.8V
13.2V
12.6V
14.6V
13.8V
13.2V
12.6V
9 ~ 17V
9 ~ 17V
9 ~ 17V
9 ~ 17V
12.2V
12.0V
11.1V
10.6V
5s
120Min
12.2V
12.0V
11.1V
10.6V
5s
——
12.2V
12.0V
11.1V
10.6V
5s
120 Min
9
9
9
9
1
~
~
~
~
~
17V
17V
17V
17V
30s
Equalizing Charging
Interval
Boost Duration Time
30Days
120Min
0Day
120Min
30Days
120 Min
0 ~ 600 Min
0 ~ 250D close equalizing charging function
)
10 ~ 600 Min
The User battery is customized battery. The system’s default voltage parameters are consistent with sealed lead-acid battery parameters. When modifying battery charging and discharging parameters, observe the following logic:
Overvoltage Disconnect Voltage>Charging Limit Voltage
≥ Equalizing Voltage≥ Boost Voltage≥
Floating Charging Voltage>Boost Restoring Voltage;
Overvoltage Disconnect Voltage>Overvoltage Disconnect Restoring Voltage;
Low Voltage Disconnect Restoring Voltage>Low Voltage Disconnect Voltage
≥ Discharging Limit
Voltage;
Under-Voltage Alarming Restoring Voltage>Under-Voltage Alarming Voltage
≥ Discharging Limit
Voltage;
Boost Restoring Voltage>Low Voltage Disconnect Restoring Voltage;
21 22
6. Conversion Efficiency Curve
6.1 12V System Conversion Efficiency
MPPT 12V System Conversion Efficiency (12V Battery)
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
20 Vmp
40 Vmp
60 Vmp
90 Vmp
40
110 Vmp
80 160 240 300 400 500
Output Power (W)
600 700 800
6.2 24V System Conversion Efficiency
MPPT 24V System Conversion Efficiency (24V Battery)
100
98
96
94
92
40 Vmp
60 Vmp
80 Vmp
90
90 Vmp
88
110 Vmp
86
84
82
80
40 80 160 480 800
Output Power (W)
1200 1600
6.3 48V System Conversion Efficiency
MPPT 48V System Conversion Efficiency (48V Battery)
99
97
60 Vmp
95
70 Vmp
80 Vmp
93
90 Vmp
110 Vmp
91
89
87
85
160 320 640 1000 1250 1500 2000 2500 3000
Output Power (W)
20Vmp
40Vmp
60Vmp
90Vmp
110Vmp
40Vmp
60Vmp
80Vmp
90Vmp
110Vmp
60Vmp
70Vmp
80Vmp
90Vmp
110Vmp
23
7. Product Size
148
182
8X
Ф
10
130 .56
178
81
4XФ4.5
160
4XФ10
Technical requirements:
Product size: 266*182*81mm
Hole position:179*160mm
Hole size: Φ4.5mm
Line material used: diameter <10mm
24

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Key features
- Advanced MPPT technology
- Supports various battery types
- Multiple protection features
- LCD screen for user-friendly parameter viewing and adjustments
- Advanced digital power technology
- Built-in algorithm for maximum power tracking
- Supports charging procedures of gel batteries, sealed batteries, open batteries, lithium batteries and other types of batteries