Power Inverters


$29.95 MSRP 
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  • DC input: 11 – 15 VDC
  • AC output: 140 VAC (140 watts peaks, 120 watts continuous)
  • AC outlets: 1
  • USB-C charge ports: 1
  • USB-C charge output: 15W
  • USB-A charge ports: 1
  • USB-A charge output: 2.4A
  • Pivoting DC plug: Yes
  • Surge protection: Yes
  • Automatic shutdown: Yes
  • Warranty: 2 year

Product Overview

The CyberPower M140BUC 140 Watt Power Inverter converts power from your vehicle's 12V DC power outlet into household AC power. The M140BUC can simultaneously power one device through its standard AC outlet, and charge up to two devices with its one, 2.4 amp USB-A port, and one 15 watt USB-C port. The M140BUC features a pivoting DC plug to accommodate tight spacing in some cars, a 15 amp fuse for overcurrent protection, and automatic power shutdown that will prevent your automotive battery from excessive power drain. The CyberPower M140BUC's AC output is rated at 120 watts continuous power, and up to 140 watts of peak power for operation of small electronics that draw a low amount of power.

Safety features include surge protection, to protect your connected devices from damaging surges. The CyberPower M140BUC is backed by a two-year limited warranty.

Product Features
  • Sensitive Electronics Safety Features
    Provide surge protection and automatic shutdown to protect electronics against power fluctuations, high temperature, short circuit, and high or low battery conditions.
  • Surge Protection
    Safeguards electronics against power fluctuations caused by vehicle startup and shutdown.
  • Automatic Shutdown
    Prevents accidental power drain of your vehicle’s battery.
  • USB Charge Ports
    Rapidly charge and powers USB devices such as tablets (including iPads), smartphones, and other mobile accessories.
  • 1 AC Power Outlet
    Provides power for laptop computers, entertainment devices, and other consumer electronics.
  • Two-Year Limited Warranty
    Covers defects in materials and workmanship in the product under normal use and conditions within two years of the purchase date. See warranty for details.
Compatible Products
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Current 12 A
Input Plug Type 12VDC Auto Power Port
AC Voltage 120 VAC
DC Power Ports None
On Battery Frequency 60 Hz
On Battery Voltage 120 VAC
Outlet Type 1 – NEMA 5-15R
Outlets – Total 1
Output Voltage 120 VAC
Output Watts – Continuous 120 W
USB Charge Port Yes
USB Charge Port Amperage 2.4 Amps (Shared)
USB Charge Port Quantity 2
USB Charge Port Standard Type A and Type C
USB Charge Port Type 1 Type A
1 Type C
USB Charge Port Voltage 5 VDC
USB Charge Port Watts 15 Watts
Watts – Peak 140 W
Color Black
Physical Dimensions – (WxHxD) (cm) 9.21 x 17.46 x 4.13 (cm)
Physical Dimensions – (WxHxD) (in) 3.625 x 6.875 x 1.625 (in)
Physical Dimensions – (WxHxD) (mm) 92 x 175 x 41 (mm)
Physical Weight (kg) 0.14
Physical Weight (lb) 0.3
Dimensions – Shipping
Shipping – Weight (kg) 0.23
Shipping – Weight (lb) 0.5
Shipping Dimensions – (WxHxD) (cm) 9.04 x 14.33 x 4.17 (cm)
Shipping Dimensions – (WxHxD) (in) 3.56 x 5.64 x 1.64 (in)
Shipping Dimensions – (WxHxD) (mm) 90.42 x 143.26 x 41.66 (mm)
Environmental RoHS Compliant
Safety FCC, DOE VI
Product Warranty 2 Year Limited Warranty
Feature Focus
Safety, Efficiency, and Power Inverters

A power inverter changes direct current (DC) to alternating current (AC), but does not produce the power, itself. These inverters provide portable, efficient power, are convenient to use, and versatile of purpose. Power inverters from CyberPower convert automobile DC power to AC power to rapidly charge and power laptop computers, tablets (including iPads), MP3 players, and other USB mobile devices. They also supply surge protection to safeguard electronic equipment.

Our power inverters offer many features for safety and efficiency, including automatic shutdown, built-in surge protection, and soft start technology. For more information about these and other features, see the user manual or Web page for the specific power inverter that you want to use.

NOTE: Features vary by model.

Automatic-Shutdown ensures that the power inverter automatically turns off to prevent your battery from draining.

Built-in Surge Protection safeguards electronics against power fluctuations, such as those which occur during vehicle startup and shutdown.

Sensitive Electronics Safety Features provide surge protection and automatic shutdown to guard electronics against power fluctuations, temperature extremes, short circuits, and high or low battery conditions.

Soft Start Technology protects electronics against power fluctuations.


USB-C is emerging as the industry-standard connector for transmitting both data and power. Compared to USB-A, USB-C is capable of much faster charging and can deliver power at up to 100 watts at 20 volts. This means larger devices can now be charged through a USB connection, including smartphones, gaming devices, tablets, laptops and more.

Plus, the USB-C is symmetrical, with no “up” or “down” orientation so it never needs to be flipped to fit into the port.

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Why is my power inverter not working?


No AC output power

Possible Causes:

1. Poor contact with the DC power outlet.

2. The vehicle’s electrical system requires ignition to be on.

3. The vehicle’s DC power outlet fuse is blown.

4. Over-heating of the power inverter.

5. The vehicle’s battery voltage is below 11 volts.

6. The vehicle’s battery input voltage is greater than 15 volts.

7. You overloaded your power inverter.

Suggested Solutions:

  1. Poor contact with the DC power outlet.
  • Ensure the power inverter is securely plugged into your vehicle’s DC power outlet. If not, replace the DC power outlet if necessary.
  1. The vehicle’s electrical system requires the ignition to be turned on.
  • Turn the vehicle’s ignition to the “Accessory” position.
  1. The vehicle’s DC power outlet fuse is blown.
  • Check the vehicle fuse panel and replace the damaged fuse.
  1. Over-heating of the power inverter.
  • Allow inverter to cool. Ensure that there is adequate ventilation around the unit and load does not exceed the unit’s Continuous Power rating (see specifications).
  1. The vehicle’s battery voltage is below 11 volts.
  • First, unplug the power inverter.
  • Second, start the vehicle to charge the battery.
  1. The vehicle’s battery input voltage is greater than 15 volts.
  • Check your vehicle’s manual for troubleshooting.
  1. You overloaded your power inverter.
  • Ensure the load does not exceed the unit’s Continuous Power rating (see specifications)

Should I register the CyberPower product I purchased?

We recommend that you promptly register the product you purchased. You may register online by clicking the Registration button at the top of the page.

Our Technical Support team will be happy help you with technical questions during business hours.

Our technical support team is available between 6AM and 9PM CST
Monday through Friday
Visit our Support Area

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