EPEVER ViewStar AU Series Solar Charge Controller

Thank you for selecting the ViewStar AU series solar charge controller. Please read this manual carefully before using the product.

1. Overview

Thank you for selecting the ViewStar AU series common positive solar charge controller. The VS-AU controller is a PWM charge controller with a built-in LCD display that adopts the most advanced digital technique. The multiple load control modes enable it to be widely used on solar home systems, traffic signals, solar street lights, solar garden lamps, etc. The features are listed below:

Adopt high-quality components of ST, IR, and Infineon, ensuring product using lifespan.
Terminals have UL and VDE certification, making the product safer and more reliable.
Controller can work continuously at full load within the environment temperature range from -25 to 55 °C.
3-Stage intelligent PWM charging: Bulk, Boost/Equalize, Float.
Support 3 charging options: Sealed, Gel, and Flooded.
LCD display design, dynamically displaying device's operating data and working condition.
Double USB design, providing power supply to charge electronic equipment.
With humanized button settings, operation will be more comfortable and convenient.
Multiple load control modes.
Energy statistics function.
Battery temperature compensation function.
Extensive Electronic protection.

Important Notes:

The battery fuse should be installed as close to the battery as possible. The suggested distance is within 150mm.
The VS AU series is a positive ground controller. Any positive connection of solar, load, or battery can be earth grounded as required.
NOTE: Please connect the inverter or other load that has a large start current to the battery rather than to the controller, if the inverter or other load is necessary.

2. Product Features

The controller features the following ports:

1. MENU Button: For browsing interfaces and setting parameters.
2. SET Button: For setting parameters, load ON/OFF, and clearing errors.
3. RTS Port: For connecting the Remote Temperature Sensor.
4. PV Terminals: For connecting the solar panel array.
5. Battery Terminals: For connecting the battery.
6. Load Terminals: For connecting the load.
7. SET Button: Used for setting parameters.
8. USB Output Ports: Provide 5VDC/2.4A power supply with short-circuit protection.

Optional Accessory:

Name: Remote Temperature Sensor
Model: RTS300R47K3.81A
Acquisition of battery temperature for undertaking temperature compensation of control parameters. The standard length of the cable is 3m (length can be customized). The RTS300R47K3.81A connects to port ③ on the controller.

NOTE: Unplug the RTS; the temperature of the battery will be set to a fixed value of 25°C.

3. Wiring

Connect components to the charge controller in the sequence shown in the diagram, paying close attention to the '+' and '-'. Do not insert the fuse or turn on the breaker during installation. When disconnecting the system, the order will be reversed.

Connection Diagram:

PV Array: Connect to the PV terminals.
Breaker: Install a breaker between the PV and the controller.
Battery: Connect to the Battery terminals. Ensure the battery is connected first to allow the controller to recognize the system voltage.
Fuse: Install a fuse between the battery and the controller.
Load: Connect to the Load terminals.

NOTE: After powering on the controller, check the LCD. If it is not on, refer to chapter 6. Always connect the battery first.

4. Operation

4.1 Button Function

Button	Function
MENU button	Browse interface Setting parameter
SET button	Load ON/OFF Clear error Enter into Set Mode Save data

4.2 LCD Display

The LCD display dynamically shows the device's operating data and working condition. It includes:

PV SOC (State of Charge)
BATT. TYPE (Battery Type)
LOAD TYPE (Load Type)
PV Voltage, Current, Power
Battery capacity, In Charging
Battery voltage, current, temperature
Battery type
Load ON/OFF
Load Voltage, Current, Load mode

Status Description:

Item	Icon	Status	Description
PV array	☀️	Day	PV array voltage, current, power
PV array	?	Night	No charging
PV array	⚡	Charging	PV array voltage, current, power
Battery	?	In Charging	Battery capacity, in charging
Battery	?	Charging	Battery voltage, current, temperature
Battery	⚙️	Battery type	Battery type
Load	?	Load ON	Load ON
Load	⚫	Load OFF	Load OFF
LOAD	?	Load mode	Load voltage, current, load mode

Browse interface:

When no operation, the interface will automatically cycle. The following two interfaces will not be displayed:

LOAD TYPE (106)
LOAD TYPE (206)

Additional Operations:

Accumulative power zero clearing: Under PV power interface, press and hold the SET button for 5s until the value blinks, then press the SET button again to clear the value.
Setting temperature unit: Under battery temperature interface, press and hold the SET button for 5s to switch between Celsius (°C) and Fahrenheit (°F).

4.3 Load mode setting

Operating Steps:

Under the load mode setting interface, press and hold the SET button for 5s until the number begins flashing. Then press the MENU button to set the parameter, and press the SET button to confirm.

Timer 1	Timer 2	Light ON/OFF
10	20	Load will be on for 1 hour since sunset.
11	21	Load will be on for 2 hours since sunset.
12	22	Load will be on for 3~13 hours since sunset.
13	23	Load will be on for 14 hours since sunset.
14	24	Load will be on for 15 hours since sunset.
15	25	Test mode
16	Disabled	Manual mode (Default load ON)
17	Disabled	Disabled

NOTE: Please set Light ON/OFF, Test mode, and Manual mode via Timer1. Timer2 will be disabled and display "2 n".

4.4 Battery Type

Operating Steps:

Under the Battery Voltage interface, press and hold the SET button for 5s to enter the Battery type setting interface. After choosing the battery type by pressing the MENU button, wait for 5s or press the SET button again to modify successfully.

Battery Type Selection:

Sealed (Default)
Gel
Flooded

NOTE: Please refer to the battery voltage parameters table for the different battery types.

5. Protections

Protection	Conditions	Status
PV Reverse Polarity	When the battery is correctly connected, the PV can be reversed.	Controller is not damaged.
Battery Reverse Polarity	When the PV is not connected, the battery can be reversed.	Controller is not damaged.
Battery Over Voltage	The battery voltage reaches to the OVD (Over Voltage Disconnect)	Stop charging
Battery Over Discharge	The battery voltage reaches to the LVD (Low Voltage Disconnect)	Stop discharging
Battery Overheating	Temperature sensor is higher than 65 °C	Output is OFF
Battery Overheating	Temperature sensor is less than 55°C	Output is ON
Load Overload	Load current ≥ 2.5 times rated current	Output is OFF
Load Short Circuit	One short circuit: output OFF 5s; Two short circuits: output OFF 10s; Three short circuits: output OFF 15s; Four short circuits: output OFF 20s; Five short circuits: output OFF 25s; Six short circuits: output OFF	Output is OFF
Load Overload	Load current reaches 1.02-1.05 times nominal value (50s), 1.05-1.25 times (30s), 1.25-1.35 times (10s), 1.35-1.5 times (2s)	Output is OFF
Damaged RTS	The RTS is short-circuited or damaged.	Output is OFF

6. Troubleshooting

Faults	Possible reasons	Troubleshooting
The LCD is off during daytime when sunshine falls on PV modules properly	PV array disconnection 1) Battery voltage is lower than 9V 2) PV voltage is less than battery voltage	Confirm that PV wire connections are correct and tight. 1) Please check the voltage of the battery. At least 9V voltage is required to activate the controller. 2) Check the PV input voltage, which should be higher than the battery's.
Wire connection is correct, LCD not display	Interface blink	Check if the battery voltage is higher than the OVD point (over voltage disconnect voltage), and disconnect the PV. When the battery voltage is restored to or above the LVR point (low voltage reconnect voltage), the load will recover.
Interface blink	Battery over voltage	Check if the battery voltage is higher than the OVD point (over voltage disconnect voltage), and disconnect the PV. When the battery voltage is restored to or above the LVR point (low voltage reconnect voltage), the load will recover.
Interface blink	Battery over discharged	When the battery voltage is restored to or above the LVR point (low voltage reconnect voltage), the load will recover.
Interface blink	Battery Overheating	The controller will automatically turn the system off. But while the temperature declines to be below 50 °C, the controller will resume.
Interface blink	Overload or Short circuit	Please reduce the number of electric equipment or check the loads connection carefully.

7. Technical Specifications

Item	VS1024AU	VS2024AU	VS3024AU	VS4524AU	VS6024AU	VS3048AU	VS4548AU	VS6048AU
Nominal system voltage	12/24VDC Auto					12/24/36/48VDC Auto
Battery input voltage range	9V~32V	9V~64V
Rated charge/discharge current	10A@55°C	20A@55°C	30A@55°C	45A@55°C	60A@55°C	30A@55°C	45A@55°C	60A@55°C
Max. PV open circuit voltage	100V	150V	150V	150V	150V	150V	150V	150V
Battery type	Sealed(Default) / Gel / Flooded
Equalize Charging Voltage	Sealed:14.6V / Gel: No / Flooded:14.8V	Sealed:14.4V / Gel:14.2V / Flooded:14.6V
Boost Charging Voltage	Sealed:14.4V / Gel:14.2V / Flooded:14.6V	Sealed/Gel/Flooded:13.8V
Float Charging Voltage	Sealed/Gel/Flooded:13.8V
Low Voltage Reconnect Voltage	Sealed/Gel/Flooded:12.6V
Low Voltage Disconnect Voltage	Sealed/Gel/Flooded:11.1V
Self-consumption	≤9.2mA/12V; ≤11.7mA/24V; ≤14.5mA/36V; ≤17mA/48V	≤9.2mA/12V; ≤11.7mA/24V; ≤14.5mA/36V; ≤17mA/48V
Temperature compensation coefficient	-3mV/°C/2V (25℃)
Charge circuit voltage drop	≤0.29V
Discharge circuit voltage drop	≤0.16V
LCD temperature range	-20℃~+70℃
Working environment temperature	-25℃~+55℃ (Product can work continuously at full load)
Relative humidity	≤95%, N.C.
Enclosure	IP30
Grounding	Common Positive
USB output	5VDC/2.4A (Total)
Overall dimension	142x85x41.5mm	160x94.9x49.3mm	181x100.9x59.8mm	194x118.4x63.8mm	214x128.7x72.2mm	181x100.9x59.8mm	194x118.4x63.8mm	214x128.7x72.2mm
Mounting dimension	130x60mm	148x70mm	172x80mm	185x90mm	205x100mm	172x80mm	185x90mm	205x100mm
Mounting hole size	Φ4.5mm	Φ4.5mm	Φ5mm	Φ5mm	Φ5mm	Φ5mm	Φ5mm	Φ5mm
Terminals	4mm²/12AWG	10mm²/8AWG	16mm²/6AWG	16mm²/6AWG	16mm²/6AWG	16mm²/6AWG	16mm²/6AWG	25mm²/4AWG
Net weight	0.22kg	0.35kg	0.55kg	0.58kg	0.76kg	0.55kg	0.58kg	1.02kg

Note: The above parameters are in a 12V system at 25°C, twice in a 24V system, triple in a 36V system, and quadruple in a 48V system.

Any changes without prior notice! Version number: V1.2

8. Disclaimer

This warranty does not apply under the following conditions:

Damage from improper use or use in an unsuitable environment.
PV or load current, voltage, or power exceeding the rated value of the controller.
The controller's working temperature exceeds the limit working environment temperature.
User disassembly or attempted repair of the controller without permission.
The controller is damaged due to natural elements such as lightning.
The controller is damaged during transportation and shipment.

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