EPSOLAR

ViewStar series
—— Solar Charge Controller

OPERATION
MANUAL

Thank you very much for selecting our product!

This manual offers important information and suggestions with respect
to installation, use and troubleshooting, etc. Please read this manual
carefully before using the product and pay attention to the safety
recommendations in it.
 ViewStar
Star
—— Solar Charge Controller

Nominal system voltage

12V∕24V∕36V∕48V
Nominal charge / discharge current
10A∕20A∕30A∕45A∕60A
Final interpretation right of the manual belongs to EPsolar.

Any changes without prior notice!

 Contents

1 Important Safety Information ....................................................................................... 1

2 General Information..................................................................................................... 2

2.1 Product Overview ........................................................................................... 2

2.2 Product Features .............................................................................................. 4

2.3 Optional Accessories ....................................................................................... 6

3 Installation Instructions ................................................................................................ 7
3.1 Mounting ........................................................................................................ 7
3.2 Wiring............................................................................................................. 9
4 Operation................................................................................................................... 12
4.1 PWM Technology ......................................................................................... 12
4.2 Battery Charging Information ........................................................................ 12
4.3 HMI Interface ............................................................................................... 15
4.4 Operation and Displaying of Controller ......................................................... 17
4.5 Remote communication and monitor ............................................................. 43
5 Protection, Troubleshooting and Maintenance ............................................................ 45
5.1 Protection ...................................................................................................... 45

5.2 Troubleshooting ............................................................................................ 46

5.3 Maintenance .................................................................................................. 49
6 Technical Specifications ............................................................................................ 50
1 Important Safety Information

Save These Instructions

This manual contains important safety, installation and operating instructions.

The following symbols are used throughout this manual to indicate potentially dangerous
conditions or mark important safety instruction.

WARNING: Indicates a potentially dangerous condition.

Use extreme caution when performing this task.

CAUTION: Indicates a critical procedure for safe and proper

operation of the controller.

NOTE: Indicates a procedure or function that is important for

safe and proper operation of the controller.

General Safety Information

 Read all of the instructions and cautions in the manual before installation.
 There are no user serviceable parts inside the controller. Do not disassemble or attempt
to repair it.
 Mount the controller indoors. Prevent exposure to the elements and do not allow water
to enter the controller.
 Install ViewStar controller in well ventilated places, the ViewStar controller heatsink
may become very hot during operation.
 Install external fuses/breakers as required.
 Disconnect the solar module, load and fuse/breakers near to battery before installing or
adjusting the controller.
 Power connections must remain tight to avoid excessive heating from a loose
connection.

1
2 General Information
Thank you for selecting ViewStar series solar charge controller. The controller adopts
advanced digital control technology, LCD display and automatical operation. With the
features of Pulse Width Modulation (PWM) battery charging and unique control
technology, the controller will improve the long battery life efficiently. Our controller has
many unique features and easy to use.

2.1 Product Overview

The controller could charge battery and discharge automatically for off-grid photovoltaic
(PV) systems. The charging process has been optimized for long battery life and
improved system performance. The comprehensive self-diagnostics and extensive
electronic protection can prevent damage against incorrect wiring or system faults.
Features:
32 bit MCU with high speed and high performance
12 bit A/D high-precision sampling to ensure accuracy
Excellent EMC design
Nominal system voltage automatic recognition or user-defined working voltage
High efficient Series mode PWM charging, increase the battery lifetime and improve the
solar system performance
Use MOSFET as electronic switch, without any mechanical switch
Wide feasibility and, recognize day or night automatically
Graphical dot-matrix LCD and 4 buttons combinations as HMI (human-machine
interface) for full menu and easy operation
Humanized design of browser interface to facilitate the operations
All of control parameters could be set and modified
Several load control methods are supported to convenient for different demand
Support 4 charging preprogram options: Sealed, Gel, Flooded and User-defined
Adopt temperature compensation and update charging and discharging parameters
automatically to improve the battery lifetime
With the feature of input filter, the voltage spike could be restrained effectively
2
Actual Power Display and record function make convenience to check the datum every
day, every month and every year
RS-485 ports via the open standard Modbus protocol are supported for long-distance
communication and communication compatibility
Standard RJ45 interface is used to connect to remote display unit (MT50) or PC
software to monitor the actual data or modify parameters
New SOC method could calculate the battery capacity accurately
Electronic protection: Overheating, over discharging, overload, and short circuit
Reverse protection: any combination of solar module and battery

3
2.2 Product Features

VS1024BN / VS2024BN

4
1 – Local temperature sensor
It is used to acquire ambient temperature to do temperature compensation for charging
and discharging.
2 – Fault LED indicator
An LED indicator that shows system faults
3 – Charging LED indicator
An LED indicator that shows charging status
4 – Liquid crystal display (LCD)
Monitoring interface for solar system parameters and running status
5 –Buttons
4 buttons used to operate and configure controller
6 – Communication port
Connect remote display unit MT50(Optional Accessories) or PC software
7 – Load terminals
Connect loads.
8 – Battery terminals
Connect batteries.
9 – Solar module terminals
Connect solar modules
10 – Remote temperature sensor interface(optional)
Connect remote temperature sensor (Optional Accessories) to acquire ambient
temperature
11 – Battery slot
Mount cell battery(RTC)

5
2.3 Optional Accessories

1. Remote Display Unit (Model：MT50)

The remote display unit is used to monitor system operating information, faults and
modify the parameters with displaying on a backlit LCD. The large numerical display and
icons are easy to read and large buttons make menus easy to navigate. The unit can be
mounted in the wall or the mounting frame. One 2m long cable are attached (the length of
cable can be customized) and the mounting box is optional. The MT50 connects to
controller through the RJ45 port.

2. Remote temperature sensor (Model：RTS300R47K3.81A)

Remote temperature sensor is used to acquire ambient temperature to undertake
temperature compensation for charging and discharging. Standard length of the cable is
3m (could be customized). The RTS300R47K3.81A connects through the 2P-3.81 port.
Note: unplug the RTS, the temperature of battery will be set to a fixed value 25 ºC.

3. Super Parameter Programmer (Model: SPP-01)

The Super Parameter Programmer can realize one-key setting operation which is suitable
for bulk quantity products setting in the projects.

4. USB To RS-485 converter (Model:CC-USB-RS485-150U)

USB To RS-485 converter is used to monitor each controller on the network using
EPsolar Station PC software and update the firmware. The length of cable is 1.5m. The
CC-USB-RS485-150U connects to the Communication port (6th) on the controller.

6
3 Installation Instructions
3.1 Mounting

 Read through the entire installation section first before beginning installation.
 Be very careful when working with batteries. Wear eye protection. Have fresh water
available to wash and clean any contact with battery acid.
 Uses insulated tools and avoid placing metal objects near the batteries.
 Explosive battery gasses may be present during charging. So well ventilation of battery
box is recommended.
 Avoid direct sunlight and do not install in locations where water can enter the controller.
 Loose power connections and/or corroded wires may result in resistive connections that
melt wire insulation, burn surrounding materials, or even cause fire. Ensure tight
connections and use cable clamps to secure cables and prevent them from swaying in
mobile applications.
 Gel, Sealed or Flooded batteries are recommended, other kinds please refer to the battery
manufacturer.
 Battery connection may be wired to one battery or a bank of batteries. The following
instructions refer to a singular battery, but it is implied that the battery connection can be
made to either one battery or a group of batteries in a battery bank.
 Select the system cables according to 3A/mm2 current density.
CAUTION: The ViewStar controller requires at least 150mm of
clearance above and below for proper air flow. Ventilation is
highly recommended if mounted in an enclosure.

WARNING: Risk of explosion! Never install the controller in a

sealed enclose with flooded batteries! Do not install in a confined
area where battery gassed can accumulate.

7
Step 1: Choose Mounting Location
Locate the controller on a vertical surface protected from direct sun, high temperature,
and water. And make sure good ventilation.

Step 2: Check for clearance

Place the controller in the location where it will be mounted. Verify sufficient room to
run wires and sufficient room above and below the controller for air flow.

150mm(5.9inches) Warm air

150mm(5.9inches) Cool air

Step 3: Mark Holes

Mark the four (4) mounting hole locations on the mounting surface.
Step 4: Drill Holes
Remove the controller and drill 4mm holes in the marked locations.
Step 5: Secure Controller
Place the controller and align the mounting holes with the drilled holes in step 4. Secure
the controller in place using the mounting screws.

8
3.2 Wiring

NOTE: A recommended connection order has been

provided for maximum safety during installation.

NOTE: the controller is common negative one.

CAUTION: Don’t connect the loads with surge power

exceeding the ratings.

CAUTION: Secure all wiring for mobile applications. Use

cable clamps to prevent cables from swaying. Unsecured
cables create loose and resistive connections which may
lead to excessive heating and/or fire.

WARNING: Risk of explosion or fire! Never short circuit

battery positive (+) and negative (-) or cables.

WARNING: Risk of electric shock! Exercise caution when

handling solar wiring. The solar module(s) high voltage
output can cause severe shock or injury. Be careful
operation when installing solar wiring.

If nominal system voltage is 12V, make sure battery voltage is higher than 9V before
starting the controller. If nominal system voltage is 24V, make sure voltage of battery is
no less than 18V; if nominal system voltage is 36V, make sure voltage of battery is no
less than 30V; if nominal system voltage is 48V, make sure voltage of battery is no less
than 42V. The nominal system voltage can only be identified when controller is powered

9
on automatically.
Controller’s load terminals can be connected to DC electric equipments whose nominal
operation voltage is the same as nominal voltage of battery. The controller supplies power
to loads with battery voltage.
It is suggested that positive pole or negative pole of battery and loads be connected to a
safety device whose operation current is not twice lower than nominal charging or
discharging current. Do not switch on the safety device while it is being installed. Switch
on the safety device after the wiring is confirmed.
CAUTION: On occasions that controller must be connected to the
ground. For common positive controller, the positive pole must be
connected to the ground, on the contrary, the negative pole must
be connected to the ground for common negative controller.

* Wire conductor length：

VS1024BN ：7mm

VS20**BN ：13mm

VS30**BN ：10mm

VS45**BN / VS60**BN ：14mm

10
Step 1: Wiring and switching on

After solar system is wired, check all wirings carefully to make it clear whether all 6
terminals are connected correctly and tightened. According to the order of switching on in
the chart, battery first, loads second and solar module third successively to avoid nominal
system voltage identification error.

Solar Array 3

Load

+ - + - + -

Fuse

1 2
Battery

Step 2: Power on

When controller starts up, liquid crystal display (LCD) displays initialization interface
and 2 indicator LED will be blinked once. Check if it is correct. If there are no above
procedures, refer to section 5 for troubleshooting.

11
4 Operation
4.1 PWM Technology (Series Pulse Width Modulation)

The controller adopts the advanced series pulse width modulation (PWM) charging mode.
With range of 0-100%, it can charge the battery quickly and stably under any condition of
solar photovoltaic system.
PWM charging mode use automatic conversion duty ratio pulses current to charge the
battery. The battery can be fully charged safety and rapidly with the pulse current.
Intermissions make oxygen and hydrogen generated by chemical reaction combined again
and absorbed. It can eliminate concentration polarization and ohm polarization naturally
and reduce the internal pressure of the battery so that the battery can absorb more power.
Pulse current charging mode makes battery have more time to react which reduces the
gassing volume and makes battery improve the acceptance rate of charging current.

4.2 Battery Charging Information

·
Bulk Charge
In this stage, the battery voltage has not yet reached boost voltage and 100% of available
solar power is used to charge the battery.

·
Boost Charge
When the battery has recharged to the Boost voltage setpoint, constant- current regulation

12
is used to prevent heating and excessive battery gassing. The Boost stage remains 120
minutes and then goes to Float Charge. Every time when the controller is powered on, if
it detects neither over discharged nor overvoltage, the charging will enter into boost
charging stage.

·
Float Charge
After the battery is fully charged in Boost voltage stage, the controller reduces the battery
voltage to Float voltage set point. When the battery is fully recharged, there will be no
more chemical reactions and all the charge current transmits into heat and gas at this time.
Then the controller reduces the voltage to the floating stage, charging with a smaller
voltage and current. It will reduce the temperature of battery and prevent the gassing, also
charging the battery slightly at the same time. The purpose of Float stage is to offset the
power consumption caused by self consumption and small loads in the whole system,
while maintaining full battery storage capacity.
In Float stage, loads can continue to draw power from the battery. In the event that the
system load(s) exceed the solar charge current, the controller will no longer be able to
maintain the battery at the Float setpoint. Should the battery voltage remains below the
boost reconnect charging voltage, the controller will exit Float stage and return to Bulk
charge.

13
Equalize Charge

WARNING: Risk of explosion!

Equalizing flooded battery can produce explosive gases, so well
ventilation of battery box is necessary.

NOTE: Equipment damage!

Equalization may increase battery voltage to the level
damaging to sensitive DC loads. Ensure that all load allowable
input voltages are greater than the equalizing charging set
point voltage.
NOTE: Equipment damage! Over-charging and excessive gas
precipitation may damage the battery plates and activate
material shedding on them. Too high an equalizing charge or
for too long may cause damage. Please carefully review the
specific requirements of the battery used in the system.

Certain types of batteries benefit from periodic equalizing charge, which can stir the
electrolyte, balance battery voltage and complete chemical reaction. Equalizing charge
increases the battery voltage higher than the standard complement voltage which gasifies
the battery electrolyte.
Every month 28th solar controller will engender equalize charging stage. It will remain
120mins when equalize stage is constant, or it will remain 180mins when equalize
charging accomplishes off and on. Equalize charge and boost charge are not carried out
constantly in a full charge process to avoid too much gas precipitation or overheating of
battery.

14
4.3 HMI Interface

Charging indicator Fault indicator LCD

WELCOME

V2.35+V2.63
！

MENU/← ↑/ + ↓/ - ENTER/→

■ Buttons instruction：

Cursor down / Number reduce button

Cursor up / Number add button

Menu / Cursor left button

Enter / cursor right button

 Charging indicator

GREEN ON whenever sunlight is available for battery charging and the charging system
is normal.

Charging LED indicator Table 4-1

Color Indicator Charging Status

Green Steady On Charging

15
 Fault indicator

When the following cases occur, fault indicator red flashing:

Solar module: Over current, Measure error of voltage, Short of reverse-protection MOS-I,
Short of charging MOS-C, MOS-I or MOS-C disconnection or MOS break in control
section;

Battery: Over voltage, Measure error of voltage, Over temp;

Load: Over load, Short, Short of discharging MOS, Measure error of voltage;

Device: Over temperature.

For trouble shooting, refer to chapter 5.

Fault LED indicator Table 4-2

Color Indicator Charging Status

PV：Measure Err、MOS-I Short、MOS-C
Short、 MOS Break
BATT：OVD、Error、Over Temp
Red Flashing
LOAD：Overload、Short、
MOS Short、Error
DEVICE：Over Temp

16
4.4 Operation and Displaying

 Load mode

1.Manual mode(default)

This mode is to turn ON and OFF the load by press button.

Parameter Detail Note

The load will open automatically Press ENTER button to

after the controller is initialized. If control load at the standby
Manual
the battery power is enough and the interface in the controller or
ON(default)
controller works well, load will in the MT50/100;
keep open
The load also could be got
through or shut down by
The load will keep off after the
monitor software in remote
controller is initialized. Only when
PC;
open load manually, load can be
Manual OFF
output. If the battery power is
enough and the controller works
well, load will keep open

2.Light On/Off

When solar module voltage goes below the point of NTTV (Night Time Threshold
Voltage) at sunset, the controller will recognize the starting voltage and turn on the load
after pre-set time delay when the battery power is enough and the controller works well.
When solar module voltage goes above the point of DTTV (Day Time Threshold Voltage),
the solar controller will recognize the starting voltage and turn off the load after pre-set
time delay. The pre-set time delay is range of 0 to 99 minutes.

17
3. Light ON + Timer

When solar module voltage goes below the point of NTTV (Night Time Threshold
Voltage) at sunset; the solar controller will recognize the starting voltage and turn on the
load after pre-set delay time. Working time 2 is the open time of load in the light mode
before dawn. The load will be on for several hours which users set. If the work time are
changed during the process, the controller will not reset the counter.

18
 Parameter Detail Note

Working The open time of load in the light mode The value is set to ZERO

Time 1 after dusk means the controller will

Working The open time of load in the light mode not work at this working

Time 2 before dawn time period; the actual

The controller calculated the total time of load-on is relative

Night time length of the night by self-learning. The with night time, working

time should be more than 3 hours time1 and working time2

4. Timer

The mode includes single and double time intervals. Set the starting and ending time for
each time interval and controller works according to the set time interval.

Parameter Detail
Time Control 1 Set the begin and end time 1 of the load output

Time Control 2 Set the begin and end time 2of the load output

Single The load output according to time1

Double The load output according to time1 and time2

● Device Parameters

Parameter Detail
ID Range: 1 - 200
Clock Format:dd-mm-yyyy hh-mm-ss
Password Default: 000000

19
● Battery Charging Setting

Battery Type Note

Sealed (default) Constant value

GEL Constant value
flooded Constant value

User Defined by user

20
 Operation and displaying of controller

 Initialization Interface
When controller is powered on, the following picture will be painted during the
initialization:

WELCOME
V2.36 + V2.63

 Main Menu Interface

After controller is initialized, the monitoring interface will update automatically. Press
button to main menu 1 interface which displays the following contents:

1．Monitoring
2．Device Set
3．Parameter Set Inverse cursor showing the

4．Load Set contents can be operated

Press button to enter into main menu 2 and main menu 3 interface which
displays the following contents:

5．Rated Value 9．Factory Reset

6．Test Mode 10. Reboot Device

7. Password
8. Batt Mng Mode

21
 System Monitor Interface
In the main menu interface, press or , the inverse cursor

moves between main menu 1 and main menu 2.When the inverse cursor points at

1．Monitoring in the main menu 1, press to enter into the system monitoring

interface which displays contents as below. Press or t display

every real-time parameters interface circularly.

▼Solar array voltage and current
The interface shows real-time voltage and current of solar module.

PV

14.5V 7.2A

▼ Battery voltage and current

Press to enter into the following interface which shows actual battery
voltage and current. Minus sign with current means that the battery is in discharging
status. Positive sign means the battery is in charging.

BATT

12.5V —5.5A

▼ Battery temperature and battery SOC

Press to enter into the following interface which indicates actual

temperature and SOC of battery.

22
 TEMP 25.6 °C

SOC: 47%

▼ Load voltage and current

Press and enter into the following interface which indicates actual voltage
and current of loads.

LOAD
12.5V 5.5A

▼ Real-time clock and imaging system status

Press and enter into the following interface which indicates real-time clock

and graphic system status. If choose the manual mode with loads, press in

the interface to control loads on and off alternatively.

Sep05 12 : 24 : 23

23
■ Introductions to system status icons:

：Day ：Night

：Charging ：Normal ：LVD

：Normal ：UVW ：LVD

：ON ：OFF

﹡
Icons indicating battery charging are dynamic effects.

▼ System status

Press and enter into the following interface which indicates system status.

PV : Disconnect
BATT : NoCharge / Normal
LOAD : On
DEVICE : Normal

24
PV status：
Connect Disconnect Measure Err
MOS-I Short MOS-C Short MOS Break

BATT charging status：

Equalize Boost Float
No Charge
BATT status:
LVD UVW Normal
OVD Error OverTemp

LOAD status：
On Off OverLoad
Short Error MOS Short

DEVICE status：
Normal OverTemp

﹡
When fault with inverse cursor above exists for 2 minutes along without any operation,

it will jump into that page automatically.

▼ Charging energy statistics

Char. Energy
Day: 1.17KWh
Mon: 25.35KWh
Total: 98.74KWh

25
▼ Discharging energy statistics

Disch. Energy
Day: 0.75KWh
Mon: 18.53KWh
Total: 54.32KWh

Device Setting

In the main menu, press or button to make the inverse cursor

point to 2．Device Set, press to enter device setting interface which displays

the following contents. When setting in this interface, real time clock will stop running.

Please correct real time clock again after parameters are changed.

Device Set Device Set

Date : 12 – 05 - 2011 ID: 001
Time : 12 : 24 : 23 Backlight: 010 sec

In the interface, press or , the inverse cursor moves among

every parameter. Pressing button could move the inverse cursor back to

main menu. When inverse cursor points at the parameter, the contents of the parameter

can be modified. press to increase the value and press to

decrease the value. LCD backlight auto-off time can be set between 00 ~999 seconds.

The below message box will be prompted after press . Press

or to choose save or cancel operation. When modification canceled, the

interface will go back main menu.. Auto-off time of LCD backlight is 60 seconds as

default.

26
 Save Parameters

Save Cancel

If save confirmation is chosen, the system will automatically check the validity of
parameters. If the check is passed, the promptation of successful saving will occur below.
After parameters successfully saved, it returns to main menu interface.

SAVE SUCCESS！

Press and hold both and button for 3 seconds to enter factory
mode in the main interface. The authority code to clear Energy Log is 102206 as default.
The clear operation can’t be recalled, so take care!

Device Set
ID : 001
Backlight : 060sec
Energy Log : Clear

27
 Charging and Discharging Parameters Setting Interface

press to enter into charging and discharging parameters setting interface as

inverse cursor at 3．Parameter Set in main menu 1. press , it moves back
to the previous interface and the inverse cursor points to the position of the first parameter.
The following control voltage parameters value must be between 9v and 17v and in
strictly accordance with: High Volt Disconnect > Charging limit voltage ≥ Equalization
voltage ≥ Boost voltage ≥ Float voltage > Boost return voltage; High Volt
Disconnect > Over Voltage Reconnect; Low voltage reconnect > Low voltage disconnect
≥ Charging limit voltage; Under voltage recover > Under voltage warning ≥
Charging limit voltage; Boost return voltage > Low voltage reconnect;

▼ Temperature compensation coefficient

Press or , then the inverse cursor moves among every

parameters sequencely. Press or to modify temperature

compensation coefficient.

Parameter Set
Temp Compensate Coeff
-03.0mV / ºC / 2V

28
▼ Control parameters interface 1

Press continuously and the inverse cursor will move to the control

parameters interface. Press or to modify the following

control parameters. The value in this interface could be modified only when the battery

type is USER defined.

Parameter Set
Over Volt. Disc : 16.0V
Charg Lmt : 15.5V
Over Volt. Rect : 15.0V

▼ Control parameters interface 2

Press continuously and the inverse cursor will move to the control

parameters interface. Press or to modify the following

control parameters. The value in this interface could be modified only when the battery

type is USER defined.

Parameter Set
Value is none
Equal Chrg : 14.6V
when GEL battery
Boost Chrg : 14.4V
Float Chrg : 13.8V

29
▼ Control parameters interface 3

Press continuously and the inverse cursor will move to the control

parameters interface. Press or to modify the following

control parameters. The value in this interface could be modified only when the battery

type is USER defined.

Parameter Set
Boost V. Rect : 13.2V
Under V. Rect :12.2V
Under V. Warn:12.0V

▼ Control parameters interface 4

Press continuously and the inverse cursor will move to the control

parameters interface. Press or to modify the following

control parameters. The value in this interface could be modified only when the battery

type is USER defined.

Parameter Set
Low V. Rect : 12.6V
Low V. Disc : 11.1V
Discharg Lmt : 10.6V

30
▼ Control parameters interface 5

Press continuously and the inverse cursor will move to the control

parameters interface. Press or to modify the following

control parameters.

Parameter Set

Range from 0 to 180

Equa.Time : 120Min
BoostTime : 120Min
Range from 10 to 180

The interface below will prompt only when the SOC is selected in the Batt Mng Mode.

Parameter Set

Charge : 100% Constant value

Discharge : 30%
Range from 10 to 80

Only when the inverse cursor moves to the last option, the modified parameters could be

saved. Press and the following picture appears.

Press or to choose save or cancel operation. When

modification canceled, the interface will go back main menu.

Parameter Set
Under V. Warn : 12.0V
Save Cancel
Low V. Disc : 11.1V
Discharg Lmt : 10.8V

31
When save operation confirmed, the indication of successful saving will prompt as
follows. After parameters successfully saved, it returns to main menu interface.

Parameter Set
Under V. Warn : 12.0V
SAVE
Low SUCCESS！
V. Disc : 11.1V
Discharg Lmt : 10.8V

 Load Control Interface

When the inverse cursor rests on 4．Load Set in main menu 1, press and

enter load control interface with the following contents displayed.

Manual
Light On / Off
Light On + Timer
Time

﹡When set light control threshold voltage, it should meet the requirement , refer to
Chapter 6 Threshold Voltage Value.

▼ Manual control interface

When the inverse cursor rests on Manual in main menu 1, press and enter

manual load control interface with the following contents displayed.

32
 Manual Default

ON OFF

Press or to choose ON or OFF as default. After confirmation,

press and the messagebox below will prompt. When it is cancelled, the

inverse cursor moves back to the main menu interface.

Manual Default
Save Cancel
ON OFF

When save confirmation chosen, the indication of successful saving will occur as follows.
After parameters successfully saved, it returns to main menu interface.

Manual Default
SAVE SUCCESS！
OFF ON

▼ Light control interface

When the inverse cursor is at Light On / Off, press to enter light control

interface shown as below:

33
 Light On/Off
On : 05.0 V Delay ：10 m
Off : 06.0 V Delay ：10 m

Press or , the inverse cursor moves among each parameters

sequencely. Press or to modify the values. The below
message box will be prompted after press Enter. Press or to
choose save or cancel operation. When modification canceled, the interface will go back
main menu.

Light On/Off
On : 06.0
SaveV Delay ：10 m
Cancel
Off : 05.0 V Delay ：10 m

When save operation confirmed, the indication of successful saving will prompt as
follows. After parameters successfully saved, it returns to main menu interface.

Light On/Off
On :SAVE Delay ：10 m
06.0 V SUCCESS！
Off : 05.0 V Delay ：10 m

▼ Light control + timer control interface

When the inverse cursor is at Light On + Timer, press to enter into light

control and time control interface.

34
 Light On + Timer
On : 05.0 V Delay ：10 m
Off : 06.0 V Delay ：10 m
Night Time : 10 : 00

Light On + Timer

Period 1: 01:00

Period 2: 01:00

Press or to modify each parameter. The below message box

will be prompted after press . Press or to choose
save or cancel operation. When modification canceled, the interface will go back main
menu.

Light On + Timer

Save Cancel

Work Time : 10 : 00 : 00

When save operation confirmed, the indication of successful saving will prompt as
follows. After parameters successfully saved, it returns to main menu interface.

35
 Light On + Timer
On : 06.0 V Delay ：10 m
SAVE SUCCESS！
Off : 05.0 V Delay ：10 m
Work Time : 10 : 00 : 00

NOTE: When the “OFF” time is later than local sunrise time, the
controller will turn off the load output at the sunrise time, because
light control’s priority level is higher!

▼ Time control interface

When the inverse cursor rests on Time in the time control interface, press to

enter into time control interface. Press or to modify all

parameters of time interval 1.

Time Control 1
On Time : 07 : 20 : 00
Off Time : 15 : 00 : 00

When is continuously pressed, it will enter into the following interface.

Press or , the inverse cursor moves among every parameters.

Press or to modify value of time interval 2. When choosing

Double time control mode, the load output will accord to time1 and time2.

36
 Time Control 2
On Time : 16 : 30 : 00
Off Time : 06 : 00 : 00

Single Double

* In the double time control mode, time1 and time2could not overlap.

When choosing Single, only value of time1 can be modified. The interface is as follows:

Time Control 2
On Time : -- : -- : --
Off Time : -- : -- : --

Single Double

If changing the time, press to submit and the following message will

prompt:

Time Control 2
On Time : 19 : 20 : 00
Save Cancel
Off Time : 07 : 00 : 00

Single Double

Press or to select ―save‖ to confirm update or cancel. After

confirmed, the cursor will move back to the main menu.

37
When updating successfully, the prompt will show below and then move back to the main
menu.

Time Control 2
On Time : 19 : 20 : 00
SAVE SUCCESS！
Off Time : 07 : 00 : 00

Single Double

 Nominal Parameter Interface

press or , move inverse cursor to 5．Rated Value, then press

button to enter into nominal parameter interface below. Battery rate and

capacity can be modified. the batter rate are 12v, 24v, 36v, 48v or auto. Battery capacity

ranges from 1 to 9999AH in the interface,. Press or to

increase or decrease the value.

Rated Value
Batt : 12.0 V 0070AH
Load : 10.0A PV : 10.0A
Type : Gel

If changing the value, press to submit and the following message will
prompt: Press or to select ―save‖ to confirm update or cancel.
After confirmed, the cursor will move back to the main menu.

38
 Rated Value
Batt : 12.0 V
Save Cancel
Load : 10.0A PV : 10.0A
Type : Seal Gel Flood

When updating successfully, the prompt will show below and then move back to the main

menu.

Rated Value
Batt : 12.0 V
SAVE SUCCESS！
Load : 10.0A PV : 10.0A
Type : Seal Gel Flood

 Test Mode Interface

Press or , move inverse cursor to 6．Test Mode, then press

and enter into test mode interface below:

Test Mode

Load:> ON OFF

 Password Setting Interface

Press or , move inverse cursor to 7．Password , then press

 and enter into test mode interface below:

39
 Password

Ori. PSW: 000000

New PSW: 000000

If changing the value, press to submit and the following message will
prompt: Press or to select ―save‖ to confirm update or cancel.
After confirmed, the cursor will move back to the main menu.

Time Control 2
Save Parameters
On Time : 19 : 20 : 00
OffSave Cancel
Time : 07 : 00 : 00

Double Single

When updating successfully, the prompt will show below and then move back to the main

menu.

SAVE SUCCESS！

40
 Battery Charge Mode Setting Interface
Press or , move inverse cursor to 8．Batt Mng Mode, then

press and enter into test mode interface below:

Batt Mng Mode

V.C. SOC

If changing the value, press to submit and the following message will
prompt: Press or to select ―save‖ to confirm update or cancel.
After confirmed, the cursor will move back to the main menu.

Time Control 2
Save
On TimeParameters
: 19 : 20 : 00
OffSave Cancel
Time : 07 : 00 : 00

Double Single

When updating successfully, the prompt will show below and then move back to the main

menu.

SAVE SUCCESS！

41
 Factory Reset Mode Interface
Press or , move inverse cursor to 9．Factory Reset , then press

and enter into test mode interface below:

Factory Reset

NO YES

If changing the value, press to submit and the following message will
prompt: Press or to select ―save‖ to confirm update or cancel.
After confirmed, the cursor will move back to the main menu.

Factory Reset
OK Cancel
NO YES

When updating successfully, the prompt will show below and then move back to the main

menu.

Factory Reset

RESET SUCCESS！
NO YES

42
 Reboot Device Setting Interface
Press or , move inverse cursor to 10．Reboot Device , then

press and enter into test mode interface below:

Reboot Device

No Yes

If needing to reboot the device, press to submit and the device will reboot
at once.
4.5 remote communication and monitor

With special communicate cable, user could monitor the status and modify the
parameters.
1- MT50 display unit( need one standard twisted-net cable, model:
CC-RS485-RS485-200U-MT)
2- Super parameter programmer, SPP-01(Use standard twisted net cable,
model: CC-RS485-RS485-200U).
One-key easily configure and apply to batch setting.

43
3- PC monitor software(need one private usb to rs485 cable, model:
CC-USB-RS485-150U)

WARNING: Do not use the standard twisted-net cable to connect the

device and PC net interface, or the permanent damage will occur.

44
5 Protection, Troubleshooting and Maintenance
5.1 Protection
• PV Array Short Circuit
If PV array short circuit occurs, clear it to resume normal charge automatically.
• Load Overload
If the load current exceeds the rated current of controller（≥1.05 times rated discharge
current）, the controller will disconnect the load. Overloading must be cleared up, then
pressing the switch button.
• Load Short Circuit
Fully protected against load wiring short-circuit（≥2 times rated discharge current）. After
one automatic load reconnect attempt, the fault must be cleared by restarting the
controller or pressing the switch button.
• PV Reverse Polarity
Fully protection against PV reverse polarity, no damage to the controller will result.
Correct the miswire to resume normal operation.
• Battery Reverse Polarity
Fully protection against battery reverse polarity, no damage to the controller will result.
Correct the miswire to resume normal operation.
• Battery working voltage error
If battery voltage does not match controller working voltage, controller will stop working.
After correcting the voltage, the failure can be eliminated through pushing load button.
• Damaged Temperature Sensor
If the temperature sensor short-circuited or damaged, the controller will be charging or
discharging at the default temperature 25℃ to prevent the battery damaged from
overcharging or over discharged.
• Overheating Protection
If the temperature of the controller heat sink exceeds 85℃, the controller will
automatically start the overheating protection and stop the charging and discharging.
When the temperature is below 75℃, the controller will resume to work.

45
• High Voltage Transients
PV is protected against smaller high voltage surge. In lightning prone areas, additional
external suppression is recommended.
Note: The controller has daily automatic fault recovery function which will reduce
the manual operation and can intelligently eliminate the fault caused by non-actual
hardware failure.

5.2 Troubleshooting

Trouble Shooting Table 5-1

Faults Possible reasons Troubleshooting

Charging LED indicator is PV array Check that PV and battery wire

off during daytime and the disconnection connections are correct and tight.
monitor shows Disconnect.
monitor shows Measure MOS-I or MOS-C Please restart controller;
Err、MOS-I Short、MOS-C are damaged. if the fault still exists, switch off
Short、MOS Break. controller immediately and contact
the supplier to make maintenance.
Loads do not work and Battery is over The controller cut off the output
monitor shows LVD. discharged automatically and recover when fully
charged.

Charging and discharging Battery is over switch off the wiring of solar array
circuit is off and monitor voltage and measure the voltage of battery
shows OVD. whether is too high.

Charging and discharging Operating ambient

circuit is off and the BATT temperature(local When operating ambient temperature
of monitoring interface temperature or battery temperature reaches
shows Over Temp. sensor) or battery exceeds 65ºC controller will cut off
temperature(remot
input and output circuit automatically.
e temperature
When the temperature is below 55℃,
sensor) over
controller will automatically
temperature
reconnect input and output circuit.

46
Charging and discharging Battery voltage
circuit is off and monitor sensor is Please restart controller, if the fault
shows Error. abnormal still exists, cut off charging and
discharging circuit immediately and
contact the supplier to make
maintenance.
Discharging circuit is off Load power
and monitor shows Over surpasses nominal Please reduce the number of electric
Load. power equipments. When load power
reaches 1.05-1.25 times, 1.25-1.5
times and 1.5 times more than
nominal value, controller will
automatically close loads in 60
seconds, 5 seconds and 1 second,
respectively. It is reactivated after
delayed 5 seconds for the first time,

10 seconds for the second time, 15

seconds for the third time, 20 seconds
for the fourth time and 25 seconds for

the fifth time. If over 5 times, push

the key ENTER and controller
recover output after 10 seconds. In
the process of 5-time reactivation, if it
is recovered manually, the 5-time
reactivation will be circulated again.
When there is any change from night
to daytime, restart the self-recovery
process. Namely, 5-time circular

reactivation can be operated again.

47
Discharging circuit is off Load circuit is
and the LOAD monitor short Please check carefully loads
shows Short. connection; It is reactivated after
delayed 5 seconds for the first time,
10 seconds for the second time, 15
seconds for the third time, 20 seconds
for the fourth time and 25 seconds for
the fifth time. If over 5 times, push

the ENTER key and controller

recover output after 10 seconds. In
the process of 5-time reactivation, if it

is recovered manually, the 5-time

reactivation will be circulated again.
When there is any change from night

to daytime, restart the self-recovery

process. Namely, 5-time circular
reactivation can be operated again.
Charging and discharging Electronical
circuit is off and the component Please restart controller, if the fault
LOAD of monitoring damaged. still exists, cut off charging and
interface shows MOS-I discharging circuit immediately and
Short、Error.
contact the supplier to make
maintenance.
Charging and discharging controller is over
circuit is off and the temperature When the temperature of controller
LOAD monitor shows exceeds 85℃, the controller will cut
Over Temp. input and output circuit. when it is
below 75℃,the controller will
automatically reconnect input and
output circuit.

48
5.3 Maintenance
The following inspections and maintenance tasks are recommended at least two times per
year for best performance.
 Check that the air flow and ventilation around the controller is not blocked. Clear all
dirt or fragments on the heat sink.
 Check all the naked wires to make sure insulation is not damaged for serious
solarization, frictional wear, dryness, insects or rats etc. Maintain or replace the wires if
necessary.
 Check and confirm that LED or LCD is consistent with required. Pay attention to any
troubleshooting or error indication .Take corrective action if necessary.
 Tighten all the terminals. Inspect for loose, broken, or burnt wire connections.
 Confirm that all the terminals have no corrosion, insulation damaged, high temperature
or burnt/discolored sign, tighten terminal screws to the suggested torque.
 Inspect for dirt, insects and corrosion, and clear up.
 Check and confirm that lightning arrester is in good condition. Replace a new one in
time to avoid damaging of the controller and even other equipments.

NOTE: Dangerous with electric shock!

Make sure that all power source of controller is cut off when operate
above processes, make inspection or other operations！

49
6 Technical specifications
Model：
1024 2024 3024 4524 6024
VS****BN

Electrical Parameters

Nominal System
12V ∕ 24V Auto recognized
Voltage
Maximum Battery
32V
Voltage
Maximum PV Voltage 48V
Rated Battery Current
10 20 30 45 60
(A)
Charge Circuit Voltage
≤0.69V
Drop
Discharge Circuit
≤0.17V
Voltage Drop
Self-consumption ≤15mA@12v; ≤13mA@24v
Communication RS485 / RJ45 interface
Remote temperature
2ERJ—3.81
sensor interface
Ground Negative to the ground

Environmental parameters

LCD temperature -20ºC ~ +70ºC

Working temperature -25ºC ~ +55ºC
Enclosure IP30

Mechanical parameters

Terminal (mm2) 4 10 16 35 35
Net weight (kg) 0.3 0.4 0.7 0.8 1.3

50
Model：
2048 3048 4548 6048
VS****BN

Electrical Parameters

Nominal System
12V ∕ 24V ∕ 36V ∕ 48V Auto recognized
Voltage
Maximum Battery
64V
Voltage
Maximum PV Voltage 96V
Rated Battery Current
20 30 45 60
(A)
Charge Circuit Voltage
≤0.53V
Drop
Discharge Circuit
≤0.16V
Voltage Drop
≤15mA@12v; ≤10mA@24v;
Self-consumption
≤9mA@36v; ≤8mA@48v;
Communication RS485 / RJ45 interface
Remote temperature
2ERJ—3.81
sensor interface
Ground Negative to the ground

Environmental parameters
LCD temperature -20ºC ~ +70ºC
Working temperature -25ºC ~ +55ºC
Enclosure IP30

Mechanical parameters

Terminal (mm2) 16 35 35 35
Net weight (kg) 0.7 0.8 1.2 1.6

51
Battery Control Parameters
All the coefficient is referred to 25℃, and twice in 24v system rate, triple in 36v system
rate and quadruple in 48v system rate.
Battery Type Gel Sealed Flooded User
High Volt Disconnect 16V 16V 16V 9~17V
Charging limit voltage 15V 15V 15V 9~17V
Over Voltage Reconnect 15V 15V 15V 9~17V
Equalization voltage —— 14.6V 14.8V 9~17V
Boost voltage 14.2V 14.4V 14.6V 9~17V
Float voltage 13.8V 13.8V 13.8V 9~17V
Boost return voltage 13.2V 13.2V 13.2V 9~17V
Low voltage reconnect 12.6V 12.6V 12.6V 9~17V
Under voltage recover 12.2V 12.2V 12.2V 9~17V
Under voltage warning 12V 12V 12V 9~17V
Low voltage disconnect 11.1V 11.1V 11.1V 9~17V
Discharging limits voltage 10.6V 10.6V 10.6V 9~17V
Equalize duration —— 120min 120min 0~180min
Boost duration 120min 120min 120min 10~180min
The following rules must be observed when modify the parameters value in user battery
type(factory default value is the same as sealed type):
Rule1: High Volt Disconnect > Charging limit voltage ≥ Equalization voltage ≥
Boost voltage ≥ Float voltage > Boost return voltage;
Rule2: High Volt Disconnect > Over Voltage Reconnect;
Rule3: Low voltage reconnect > Low voltage disconnect ≥ Charging limit voltage
Rule4: Under voltage recover > Under voltage warning ≥ Charging limit voltage;
Rule5: Boost return voltage > Low voltage reconnect

52
Threshold voltage value
Night Time Upper limit 10V;20V∕24V; 30V∕36V; 40V∕48V
Threshold Voltage Low limit 1V; 2V∕24V; 3V∕36V;4V∕48V
Default 6V/12V
Day Time Upper limit 10V; 20V∕24V;30V∕36V; 40V∕48V
Threshold Voltage Low limit 1V; 2V∕24V; 3V∕36V;4V∕48V
Default 5V/12V

Temperature compensate
Temperature Upper limit 0mV∕℃∕2V
compensate Low limit -9mV∕℃∕2V
coefficient Default -3mV∕℃∕2V @25℃
* Compensation of equalize, boost, float and low voltage disconnect voltage.

SOC parameters
Precent of charging 100% constant value
Precent of discharging 10~80%, Low SOC reconnect is higher Low SOC
disconnect than 5%

53
 39.5
Φ4.5

55

85
150

162

VS1024BN Dimensions

49.5

Φ4.5
100
70

150
162

VS2024BN Dimensions
 57.7
Φ4.2

103
70
191
200

VS2048BN & VS3024BN Dimensions

58.6

Φ4.2
109
80

191
200.6

VS3048BN & VS4524BN Dimensions

 66.6
Φ4.5

119
80
195
204.8

VS4548BN Dimensions

67

Φ4.5
129
90

195
204.8

VS6024BN Dimensions
 185

64

205

195

130 174

Φ5

VS6048BN Dimensions
Version number: V1.7
BEIJING EPSOLAR TECHNOLOGY CO., LTD.
Tel：010-82894112 / 82894962

Fax：010-82894882

E-mail：info@epsolarpv.com

Website: www.epsolarpv.com