• 48V Mini Compressor

    The RIGID miniature refrigeration dc compressor is a breakthrough in vapor compression technology, featuring low vibration and low noise operation. Its tiny size is the first real innovation in miniature compressor technology in a century.
    RIGID mini dc compressors can be utilized in many thermal management applications, from compact refrigeration, small circulating coolers, tiny water coolers, medical cooling, direct cooling of electronics, micro dc air conditioners to mobile a/c cooling.
    RIGID micro and miniaturized compressors - Enabling the development of light, compact systems for refrigeration. Designed to optimize space and weight, mini compressors are perfect for small and mobile refrigeration. The small size of mini compressors makes them perfect for mobile or portable refrigeration, cooling electronics, and numerous commercial appliances where weight and space are important.
    For smooth and easy temperature regulation, RIGID miniature rotary DC compressors with cooling capacities from 100W to 700W (2Btu) are driven by our patented driver board. This drive board can be continuously controlled by the frequency of a square wave signal with speeds ranging from 2,000 rpm to 6,500 rpm.
    For over decades, RIGID rotary variable speed mini compressors have been an industry leader in DC Air Conditioner and Compact Commercial Refrigeration. With the most advanced technologies and high-quality standards, RIGID continues to exceed customer's expectations.
    RIGID Mini Compressor Provides Unparalleled Performance!

  • Advantages of DC 48V Mini Compressor



    Smallest Footprint


    Super compact size: 2.3 x 3.07 inch.

    Lightest Weight


    720 grams only (Including Refrigerator oil).

    Sine Wave Drive Borad


    Variable Speeds ranging from 2,000 to 6,000rpm.

    Brushless DC Rotary Compressor


    Battery or dc power supply, Low energy consumption.

  • 48V Mini Compressor, QX1903VDL

    48V Mini Compressor, QX1903VDL

    Capacity: 455W (1,552Btu)

    • 48V DC
    • 900g /1.98lbs
    • Refrigerant: R134A
    • Work at ambient temp 55℃
    • Size: 92.2 x 71 mm (High x Diameter)
    • Working Amps: 1~4.1A, (Maximum 7.5A)
    • Variable speed drive board (2000~6500rpm)
    Benefits: Compact, light, competitive price, advanced motor drive controller provides a variable speed and load-following capability for precise temperature control and high efficiency.
    Documents Download
    1. Specification pdf.
    2. Characteristic Curve pdf
  • 48V Mini Compressor Performance Curve

    Model: QX1903VDL


    QX19(48V) Characteristic Curve

    48V Mini Compressor

    • Voltage: 48V DC
    • Refrigerant R134a 
    • Net Weight: 1.6 lbs / 0.72kgs
    • Motor Type: Variable Speed Motor
    • Capacity: 100~455W (360~1550Btu)
    • Small compressor for heating & cooling
    48V Mini Compressor Features
    • Low installation costs
    • Lightweight & small size
    • Low energy consumption
    • Low operating noise (45dB)
    • Fully hermetic, No maintenance
    • Battery, solar power, DC power run
    • World’s smallest DC 48V compressor
    • Apply to HBP, MBP & LBP applications
    • Applications: Heating, Cooling, and Refrigeration.
    48V Mini Compressor Manufacturer

    48V Mini Compressor Manufacturer


    RIGID mini bldc compressors are equipped with their own patent driver board to ensure high efficiency, variable speed control, and load-following capabilities, which allows you to set the speed and load following to precisely control the temperature.


    The compact size, lightweight, and durability of RIGID mini compressors make them ideal for mobile and portable applications.


    RIGID 48v mini compressors consume less energy and are quiet. As an electrical power source, they can use battery, vehicle, grid, or solar power. They can also be powered by AC using an AC-DC converter.


    RIGID tiny compressors provide outstanding cooling, precise control, unique flexibility to meet the growing market demands for miniature thermal management systems.


    In addition to compact power and precision, RIGID miniature dc compressors provide unique flexibility and meet the increasing demand for thermal management systems.


    48V Mini Compressor Manufacturer

    Drive Board & Display Panel


    It is easy to integrate the drive board (PCB) & display panel into your application if you need sophisticated functions, or want to control by your software.


    The motor drive board is a variable speed drive. This allows the cooling capacity of the system to be adjusted by increasing or decreasing the compressor speed. The compressor drive board utilizes a user-supplied 0-5 VDC analog signal to set the compressor speed. The firmware has a minimum speed of 2,000 RPM (0.7 VDC or lower) and a maximum speed of 6,000 RPM (4.5 VDC or higher).

    The voltage to RPM relationship is linear between 0.7 and 4.5 V so the following equation can be used: S = 1132×V+1408.

    * Where S is compressor speed (RPM) and V is the control voltage (VDC).

  • RIGID Micro & Miniaturized Compressor - Enabling the Development of Light, Compact Systems for Refrigeration


    Designed to optimize space and weight, mini compressors are perfect for small and mobile refrigeration. The small size of mini compressors makes them perfect for mobile or portable refrigeration, cooling electronics, and numerous commercial appliances where weight and space are important.


    As a world leader in miniature refrigeration manufacturing, RIGID rotary mini bldc compressors are recognized for their reliability and quality, as well as for their excellent sound reduction and efficiency.


    We are continuously developing our rotary compressors, not only to discover new technological advances but also to improve and reach our most successful results when operating them.


    The BLDC rotary mini compressor features an optimal pump that operates quietly, while also providing excellent performance. In addition to heat pumps, air conditioners, and commercial cooling applications, this compressor is also well suited for various compact refrigeration applications.


    Compared to traditional compressors, RIGID variable speed rotary compressors offer highly efficient and energy-saving features. Unlike a fixed-speed compressor that constantly runs at 100%, the Inverter Rotary Compressor delivers only as much air as it needs for cooling, saving significant amounts of electricity.


    Your products will stand out. Your systems will be outstanding!

  • Online Store

  • 48V Mini Compressor Applications - Compact & Mobile Refrigeration


    RIGID miniature compressors have the size, weight, and durability that make them well-suited to mobile or portable applications, including:

    • Small Cooling
    • Medical Device
    • Beverage Cooling
    • Small Refrigerators
    • EV/RV Battery Cooling
    • Portable Heat Pumps
    • Electronic Components
    • Mini-Chilled Water Systems
    • Portable DC Air Conditioner
    • Electronics Cooling Systems
    • Aesthetic & Medicine Device
    • Telecommunications Cooling
    • Portable Mini Cooling Systems
    • Miniature Refrigeration/Freezer Systems
    • Thermally-Controlled Shipping Containers
    • Portable and Small Cooling Applications
    • Automotive (Electric Vehicle, Vessel, Helicopter)
  • FAQ

    Direct Expansion Evaporator System Unit Frequently Asked Questions

    This FAQ is for Direct Expansion System. More details? Pls Go Here!

    1. What is direct expansion system?

    Direct Expansion means that the refrigerant expands to produce the cooling effect in a coil that is in direct contact with the conditioned air that will be delivered to the space.

    2. What is Direct Expansion Evaporatorin mechanical engineering?

    A direct expansion refrigeration unit, also known as a condensing unit, uses condensed refrigerant liquid to cool the air in a given space. It is widely used in micro refrigeration, small refrigerators, mobile freezers, medical, laser, precision instruments, laboratory equipment, etc.

    3. What is expansion system?

    A direct expansion system enables the most compactly designed refrigerant system. A direct expansion system eliminates the use of a secondary coolant loop and uses the refrigerant to directly cool the desired payload via a cold plate. In a DX system, the evaporator absorbs heat directly from the payload.

    4. How does a direct expansion system work?

    The expansion parts (valve or capillary) controls the flow of refrigerant into the evaporator coil. Hot air is extracted from the specific space and blown over the heat exchange coil by the evaporator/indoor fan. The refrigerant in the coil absorbs the heat and expands. This lowers the temperature of the air being blown into the space/room.

    5. What is the difference between indirect and direct cooling system?

    In cooling systems, the distribution can be either direct or indirect. If direct, the cooling water goes directly into the internal piping system of a building. In an indirect system, a heat exchanger separates the internal from the external system.

    6. What is the difference between DX system and chilled water system?

    The immediate and most noteworthy difference between these two units is that the DX (direct expansion) unit cools air, and the chiller units cool water. Chiller units cool water for use in other liquid systems like chilled water handlers.

    7. What is the main function of an expansion valve or capillary?

    The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. The high-pressure liquid refrigerant entering the expansion valve is quite warm.

    8. How many types of RIGID HVAC refrigeration systems?

    There are 4 types of refrigeration systems:

    1. Micro DC Aircon (Air Cooling)
    2. Plate Liquid Chiller (Liquid Cooling)
    3. Coaxial Liquid Chiller (Liquid Cooling)
    4. Coil Liquid Chiller (Liquid Cooling)
    5. Direct Expansion System (DC Condensing Unit)

All Posts