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MobileSpec MSI120C

120-watt cup-holder power inverter

Item # 177MSI120C

Turn an unused cup holder into a power station for your electronics.

Turn an unused cup holder into a power station for your electronics.

Discontinued item

Item # 177MSI120C

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About the MobileSpec MSI120C

Dave Delamere

A novel power station

If you're looking for more options to charge your portable devices while you're driving, MobileSpec's MSI120C 120-watt power inverter fits in an unused cup holder and can charge three devices simultaneously. This inverter includes a standard 3-prong AC outlet, a USB-A port, and a USB-C port to work with a wide variety of gear. Don't worry, overload, voltage, and temperature protection is built right in, so the inverter won't harm your gear. The integrated stand also accommodates a smartphone or tablet and can be detached when it's not in use.

Product highlights:

  • portable cup-holder power inverter with 24" 12-volt adapter
  • 120 watts of continuous AC power
  • one 3-prong AC outlet, one USB 2.4-amp port, and one USB-C 3-amp port
  • removable smartphone/tablet holder
  • built-in high/low voltage, temperature, and overload protection
  • dimensions: 7.0"L (with detachable stand) x 3.2"W x 3.5"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # MSI120C

What's in the box:

  • Car cup power inverter with attached 24" input cable (12V power plug)
  • Owner's Guide

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More details on the MobileSpec MSI120C

Russ B.

Product Research


Overview: The MobileSpec MSI120C is a portable power inverter that fits into your vehicle's cup holder. It takes the DC power from your 12-volt power port and delivers AC power to a single 3-prong outlet, and DC power to dual USB ports. The inverter also has a cradle for your smartphone or tablet. Its dimensions are 3.2"W x 7.0"H x 3.5"D, and it weighs 10.3 ounces.

Cup Design: The Power Inverter is designed to fit securely into your vehicle's cup holder. The "cup" portion is 2.66" in diameter. There are ventilation openings on the front and back to keep the inverter cool. Its ideal operating temperature range is 32°F to 104°F. There should be at least 2" of unobstructed air space around the entire surface of the inverter at all times. The AC and USB outlets are all positioned on the angled top panel. A single LED glows green when the outlets are active, and red when there is an overload or error.

Input: The MSI120C plugs into your vehicle's DC power port, and accepts an input of 11 to 15 Volts DC. For convenience, the input has a 24" power cord to reach the power port from your cup holder.

AC Outlet: The Power Inverter features one 3-prong standard North American AC socket. The outlet is rated at 115V AC, 58-62Hz on its Modified Sine Wave (MSW). It provides up to 120 watts of continuous power and 240 watts surge power. It operates at 85% max efficiency.

Dual USB Outputs: The MobileSpec MSI120C offers two USB ports for charging your electronic devices. The USB-C port's output is rated at 3A (15 watts). The USB Type A port has a 2.4A output for a total of 12 watts.

Battery Operating Time: When the vehicle battery is the sole power source, the inverter could be a significant draw on the battery's power, depending on the charge level of the battery, its capacity, and the amount of power being drawn by the particular AC load. Typically, the battery has an operating time of 4 to 5 hours or more. It is strongly recommended that you start the vehicle every one or two hours to recharge the battery before its capacity drops too low. With no devices plugged in, the inverter has a no load draw of less than 0.5A, so its impact on the battery charge is negligible.

Typical Power Requirements: The Mobile Spec inverter can power most low-to-moderate wattage AC electronic devices. Here are some typical appliances that can be powered by the MSI120C, and their wattage ratings:

  • Cellular Phone: 3 watts
  • Tablet: 15 watts
  • Glue Gun: 20 watts
  • 7" Portable DVD player: 48 watts
  • Laptop Computer: 60-100 watts
  • Video Game Console: 60-300 watts
  • Lamps (up to 70 watts): 75 watts
Note: You should check the wattage rating of your device before plugging it into the inverter to be sure you're not exceeding the capacity of the inverter.

Safety Features: To protect the battery, the MSI120C will automatically shut off when the input power drops below 10.5V DC (+/-0.3V) or above 15V DC, or if the internal temperature of the device is too high. It has a built-in, user-changeable glass fuse of 12A to protect the inverter in case of an overload.

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