DC-DC Adjustable Buck Power Supply Module 800W–1500W
DC-DC Adjustable Buck Power Supply Module 800W–1500W
Gaqqee DC-DC Adjustable Step-Down (Buck) Power Supply Module
Take full control of your power conversion needs with the Gaqqee DC-DC Adjustable Step-Down Power Supply Module. Available in 800W, 1200W, and 1500W configurations, this non-isolated buck regulator accepts a wide DC input range of 15V–90V and delivers a fully adjustable output of 2.5V–72V — making it an ideal solution for industrial equipment, power tools, battery charging systems, laboratory power supplies, and more.
With up to 97% conversion efficiency, a temperature-controlled air-cooled fan, and continuously adjustable constant-current output, this module is built for demanding, high-reliability applications. Made in China.
Key Features
- Wide Input Voltage Range: DC 15V–90V input supports a broad range of power supply systems, maximising versatility and compatibility.
- Adjustable Output Voltage: DC 2.5V–72V output (max output = input voltage × 0.8), continuously adjustable via the onboard CV potentiometer.
- Multiple Power Options: Choose from 800W (28A), 1200W (50A), or 1500W (50A) variants to suit your exact application requirements.
- Constant-Current Output: Maintains stable output current — 1.5–28A (800W) or 2–50A (1200W/1500W) — ideal for constant-current applications.
- High Conversion Efficiency: Up to 97% efficiency minimises energy loss and heat generation, improving overall system performance.
- Air-Cooled with Smart Fan: Temperature-controlled fan activates at approximately 45°C, ensuring reliable thermal management in demanding environments.
- High-Quality Components: Rigorously tested electronic components ensure long-term stable operation in industrial environments.
- 80 kHz Operating Frequency: Delivers low ripple and stable output for sensitive electronics and precision equipment.
Product Specifications — 800W & 1200W Modules
| Module Type | Non-isolated buck (step-down) regulator |
| Input Voltage | DC 15–90V |
| Output Voltage Range | DC 2.5–72V (max = input × 0.8) |
| Max Output Power | 800W / 1200W (well-ventilated environment required) |
| Continuous Rated Power | 700W / 1000W |
| Max Output Current | 28A (800W) / 50A (1200W) |
| Continuous Rated Current | 25A / 40A |
| Short-Circuit Protection | Yes (constant current protection) |
| Operating Frequency | 80 kHz |
| Conversion Efficiency | Up to 97% |
| Operating Temperature | -10°C to +65°C |
| Cooling Method | Air-cooled (fan activates at ~45°C) |
| Input Reverse Polarity Protection | None — reverse polarity strictly prohibited |
Product Specifications — 1200W & 1500W Modules
| Module Type | Non-isolated buck (BUCK) regulator |
| Input Voltage | DC 15–90V (10–15V supported via short-circuit terminals) |
| Output Voltage Range | DC 2.5–72V (max = input × 0.8) |
| Max Output Power | 1200W / 1500W (well-ventilated, output ≥50V) |
| Continuous Rated Power | 1000W / 1200W |
| Max Output Current | 30A (1200W) / 50A (1500W) |
| Continuous Rated Current | 25A / 45A |
| Output ON/OFF Interface | Yes (user-wired) |
| Operating Frequency | 80 kHz |
| Conversion Efficiency | Up to 97% |
| Operating Temperature | -10°C to +65°C |
| Cooling Method | Air-cooled (fan activates at ~45°C) |
| Input Reverse Polarity Protection | None — reverse polarity strictly prohibited |
How to Adjust Voltage & Current
Voltage Adjustment: Use a flat-bladed screwdriver to turn the blue CV potentiometer. Clockwise increases output voltage; anticlockwise decreases it. Note: maximum output voltage is approximately 20% lower than the input voltage.
Current Adjustment: Set a multimeter to the 50A, 20A, or 10A range. Set supply voltage to 5V. Turn the CC potentiometer anticlockwise ~10 turns to set current to minimum, then short-circuit the output terminals. Gradually turn CC clockwise to dial in the required current value. (If output voltage disappears after turning CC fully anticlockwise, this is normal — current has been set to 0A; turn clockwise to restore output.)
Important Safety Notes
- ⚠️ No reverse polarity protection — incorrect polarity will damage the module.
- ⚠️ No over-voltage protection — do not exceed 90V input.
- ⚠️ Output back-feed protection is absent — when charging batteries or connecting inductive loads (e.g. motors), a back-feed protection diode must be installed externally.
- ✅ Ensure adequate ventilation during operation to maintain rated performance.
What's in the Box
- Step-down power supply module × 1
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Frequently Asked Questions
Q: What is the input voltage range for the DC-DC step-down power supply module?
A: The module accepts a DC input voltage of 15V to 90V. Some variants also support 10–15V input by short-circuiting the designated terminals on the board. Never exceed 90V input, as there is no over-voltage protection built in.
Q: How do I calculate the maximum output voltage for a given input voltage?
A: The maximum output voltage is approximately 80% of the input voltage (input voltage × 0.8). For example, a 40V input yields a maximum output of 32V, and a 90V input yields a maximum output of 72V. The output can be adjusted down to a minimum of 2.5V using the onboard CV potentiometer.
Q: Which power variant should I choose — 800W, 1200W, or 1500W?
A: Choose based on your application's power demands. The 800W module supports up to 28A output current and suits moderate industrial or power tool applications. The 1200W module supports up to 50A and is ideal for higher-load systems. The 1500W variant provides maximum headroom for high-power equipment such as battery chargers and industrial machinery operating at 50V or above.
Q: Does this module require external cooling?
A: The module is air-cooled with a built-in temperature-controlled fan that activates automatically at approximately 45°C. For continuous rated operation, ensure the module is installed in a well-ventilated environment to sustain full power output without thermal throttling.
Q: Is reverse polarity protection included?
A: No. This module does not include input reverse polarity protection. Connecting the input terminals with incorrect polarity will cause permanent damage. Always verify polarity before connecting power. Similarly, there is no input over-voltage protection, so exceeding 90V input is strictly prohibited.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.