MPPT 720W Stepdown 25A Solar Controller 18V-80V Input Charging For 12V 24V Lithium Lead-acid Gel Battery Real-time Tracking Adjustab USB output

Note: This controller is a buck controller. The solar panel voltage must be higher than the battery voltage to buck charge the battery. For example, when charging a 12V battery, the solar panel voltage should be higher than the battery voltage. You can connect Vmp 18V~Voc 80V solar panel. When charging a 24V battery, the solar panel voltage should be higher than the battery voltage. You can connect Vmp 36V~Voc 80V solar panel.

The 20A 450W product has been discontinued. We are now shipping the 720W 25A solar buck controller. Please feel confident in your purchase.

Additionally, the shipping label may still show 450W, but there is no need to worry. This is because the platform cannot update the product model.

Product Features:

1.MPPT maximum power point tracking technology achieves up to 98% charging efficiency, making optimal use of solar energy.

2.Powered by solar panels for eco-friendly and energy-efficient operation.

3.Multiple safety protections: Overcharge protection, overcurrent protection (up to 25A), reverse current protection, short circuit protection, temperature protection, etc., ensuring stable and safe system operation.

4.Set charging voltage using plus and minus buttons, suitable for various battery types such as lead-acid, lithium iron phosphate, and lithium batteries.

5.Supports intelligent solar irradiance tracking, achieving MPPT maximum power point tracking for enhanced charging efficiency.

6.LED digital display shows photovoltaic panel current, power, and battery voltage in a scrolling manner, enabling real-time system status understanding.

7.Intelligent fan cooling: Fan turns on at temperatures above 38°C and turns off below 32°C, enhancing efficiency and reducing power consumption.

Product parameters

• Product name: MPPT Step-Down Solar Controller
• Input voltage: 18V-80V
• Output voltage: 12V / 24V
• Maximum current: 25A
• Rated power: 12V:25A/375W, 24V:25A/720W
• USB output: 5V2A Max
• Compatible battery: Lead-acid/Lithium/Lifepo4/Gel
• Size: 137*81*30(mm)
• Weight: 260
• Conversion efficiency: 98%
• Protection level: IP30
• Shell material: magnesium aluminum alloy
• Working temperature: -20℃-60℃

Packing list:

1 * Solar Step Down controller

2 * 30A Fuse

1 * Chinese User Manual(If you need an electronic English user manual, please contact customer service)

Safety Recommendations:

Recognizing the significance of energy and safety in product use, we urge you to follow these safety recommendations:

1.The battery pack stores substantial energy. Ensure no short circuits occur in the battery pack. We recommend installing appropriate slow-blow fuses in the circuit to ensure the safe utilization of rated current.

2.Battery packs emit flammable gases. Place battery packs in well-ventilated areas, away from open flames. Prevent wire and terminal short circuits, as some terminals or wires might generate voltages and currents twice the rated voltage and current of the battery pack. Always use insulated tools during operations.

3.Keep children away from battery packs and controllers to ensure their safety.

4.Follow the safety recommendations of the battery pack manufacturer to ensure correct product usage.

5.When installing this controller, avoid directly mounting it on metal supports to minimize potential electromagnetic interference.

Scope of Application:

The controller works with solar panel inputs ranging from 18V to 80V, and the controller can step down the output voltage of the battery pack to 12V to 30V. The battery pack can be an open or sealed lead-acid battery pack, and also supports lithium iron phosphate and lithium batteries.

System Operation:

Upon proper connection, the system starts automatically in sunlight. LED digital display lights up, signifying system initiation.

Post initiation, the LED digital display shows photovoltaic panel current, power, and battery voltage. When the charging current reads 0.0A, the battery pack is fully charged, and charging stops.

When the system runs abnormally, press and release the "Reset" button, and the system will automatically reset and restart.

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Setting Battery Pack Charging Voltage:

After the controller is successfully connected, the system automatically recognizes the lead-acid battery voltage of 12V/24V by default and automatically starts charging. If it is a battery of other specifications, it needs to be set.

• Simultaneously press and hold the '+' and '-' buttons for 3 seconds to access the charging voltage settings.

• Press and hold the '+' button for 3 seconds to enter the constant current charging settings.

• Press and hold the '-' button for 3 seconds to enter the load discharge protection settings.

• A short press of the '-' button can toggle the load output on or off.

• After completing the parameter settings, the system will automatically save and exit the settings after 10 seconds.

Usage Usage Suggestions:

• To avoid controller overload, ensure that the photovoltaic panel connected to the 12V battery has a working voltage (VMP) ranging from 18V to an open-circuit voltage (VOC) of 80V. Similarly, the photovoltaic panel connected to the 24V battery should have a working voltage (VMP) between 36V and an open-circuit voltage (VOC) of 80V. It is important to note that the common parameters for typical photovoltaic panels include a working voltage of 18V and an open-circuit voltage of 22V, as well as a working voltage of 36V and an open-circuit voltage of 44V. Before making the connections, carefully review the parameters on the back of the photovoltaic panel.
• As the controller generates heat during operation, ensure installation in well-ventilated environments.
• We recommend installing a switch between the battery pack and controller to ensure safety during wiring.
• Regularly fully charge the battery pack. Charging at least once a month is essential to prevent battery damage.

Important Notes-Please carefully read and adhere to the following safety instructions:

• Strictly prohibit exceeding rated voltage and power ranges. Overvoltage and overpowering may lead to equipment damage or danger.
• Correct voltage setting: Before installing the controller, ensure the selected voltage setting matches the battery voltage. Charging a low-voltage battery with a high-voltage setting can lead to improper charging and battery damage.
• Installation steps: When installing the controller, follow these steps:

a. Firstly, correctly connect the solar panel to the controller's input terminal.

b. Next, connect the battery to the controller's output terminal.

• Ensure the red wire of the input and output lines is connected to the positive terminal, and the black wire is connected to the negative terminal.
• Wire length: To minimize energy loss, keep the wire length connecting to the controller as short as possible.
• Solar panel placement: When using solar panels, place them in an area with ample sunlight and no obstructions. Obstructions can impact panel efficiency, leading to decreased system performance.
• Ventilation and cooling: The controller generates heat during operation. To ensure long-term stable operation, install the controller in a well-ventilated environment to prevent overheating.
• Fuse replacement: Strictly avoid replacing fuses with those of higher ratings or using substitutes like copper wire. The controller's fuse is rated at 30A. Proper fuse usage effectively protects the circuit and ensures device safety.

Adhering to the above instructions will enable you to use our MPPT solar Step-Down controller correctly and safely. For any queries or further consultation, feel free to contact our customer service team. Thank you for your support and collaboration!