Solar Voltage Reduction Controller-High-frequency MPPT solar charge controller-Dongguan Hongyi Electric Products Co., Ltd.

Solar Voltage Reduction Controller

Product Brief: A Solar Voltage Reduction Controller is a specialized DC-DC power conversion device designed exclusively for photovoltaic (PV) systems, whose core function is to step down the high and fluctuating DC voltage generated by solar panels to a stable, low DC voltage that matches the requirements of batteries, loads, or subsequent power equipment. It serves as a critical intermediate component in off-grid, grid-tied, and mobile solar applications, ensuring safe, efficient, and reliable power transfer between solar panels and end-use devices.

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Description

Parameter Name	Parameter Value
Product Model	Step-down Solar Charge Controller
Input Voltage	18V – 145V
Max Input Current	25A – 100A
Input Power	700W – 5600W
Battery Type	Lead-acid, Gel, Lithium
Solar Panel Type	Monocrystalline or Polycrystalline Silicon
Output Voltage	12V / 24V / 48V
Max Output Current	25A / 30A / 50A / 60A / 100A
Voltage Level	Switching Settings (Voltage & Type)	Configuration Details	Full Charge Voltage
12V Level (Top Terminal)	1. Lead-acid: 1pcs x 12V battery	Factory Default	14.6V
	2. Lithium battery option - 4-cell lithium iron phosphate battery		14.6V
	3. Lithium battery configuration - 3-cell ternary lithium battery		12.6V
	4. Lithium battery option - 4-cell ternary lithium battery		16.8V
24V Level (Middle Terminal)	1. Lead-acid setting - 2 lead-acid batteries		29.2V
	2. Lithium battery option - 8-cell lithium iron phosphate battery		29.2V
	3. Lithium battery option - 7-cell ternary lithium battery		29.4V
	4. Lithium Battery Mode — 6-Series Ternary Lithium Battery		25.2V
48V Level (Bottom Terminal)	1. Lead-acid setting - 4 lead-acid batteries		58.4V
	2. Lithium battery option - 16-cell lithium iron phosphate battery		58.4V
	3. Lithium Battery Mode — 15-Series Lithium Iron Phosphate Battery		54.7V
	4. Lithium battery option - 14-cell ternary lithium battery		58.8V

FAQs

How to Choose the Right MPPT Controller Size?

Calculate the required charging current using this formula:

Charging Current (A) = Total PV Wattage (W) ÷ Battery Voltage (V) × 1.25 (Safety Factor)

Example: 800W PV array + 48V battery bank → 800 ÷ 48 × 1.25 = 20.8A → Choose a 20A or 30A controller.
Also, ensure the PV open-circuit voltage (Voc) does not exceed the controller's maximum PV input rating.

What is the Correct Wiring Order?

To avoid damage, follow this sequence strictly:

Connect the Battery first (positive to positive, negative to negative).
Connect the Solar Panels (PV input).
Connect the Load (optional).
Note: Use appropriately sized cables and fuses for safety.

Why is My Controller Not Charging?

PV Voltage Too Low: Ensure the solar panel voltage is at least 5V higher than the battery voltage.
Wiring Issues: Check for reversed polarity, loose connections, or blown fuses.
Battery Full: The controller will taper or stop charging once the battery is full.
Over-temperature Protection: The controller may reduce current if it gets too hot.

What is Temperature Compensation?

A built-in sensor adjusts the charging voltage based on battery temperature. It prevents overcharging in hot weather and undercharging in cold weather, significantly extending battery life.

What is an MPPT Solar Charge Controller?

MPPT (Maximum Power Point Tracking) is an advanced technology that continuously monitors the voltage and current output from solar panels, dynamically adjusting the operating point to extract the maximum available power under varying light conditions. It efficiently converts high PV voltage to the battery’s charging voltage, significantly boosting energy harvest compared to traditional PWM controllers.

Solar Voltage Reduction Controller

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