EarthWalk has developed, engineered, and patented its High-Efficiency (HE) electrical power management systems to enable your mobile computer carts to operate and perform unlike any other solution available—integrated energy-efficient charging for laptops.


HE-Z is a game-changer when it comes to efficient/simultaneous charging while saving you time and money. This is a flexible, 2-part system: (1) Each device slot in the cart/lab has one half of the charging cord hard-wired into the cart with an accessible universal DC power socket. (2) Device-specific pigtails (or connectors) fit into the universal, hard-wired power socket. Device-specific connectors fit into the hardwired power sockets, so you can have a mix of laptop brands in one cart. It’s easy to upgrade devices, no tools necessary, no adapters needed.

HE Charger Spec Sheet



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Check out the YouTube videos below to see how simple it is to install device-specific “pigtails” into the hard-wired power sockets and how EASILY you can change or update devices without having to update your carts. NOTE: The video examples are shown with our SaverSeries cart.

VIDEO 1: Attach the device-specific pigtail connector to the hardwired socket
VIDEO 2: Place device into its slot and easily attach the pigtail/dongle into the charging port/socket
VIDEO 3: Easily change devices stored in the cart by simply removing the device and its charging pigtail/dongle

High Efficiency Highlights

EarthWalk’s patented High Efficiency (HE) technology is the world’s most energy-efficient approach to charging groups of laptops. The HE charging system operates at up to 85% AC to DC conversion efficiency compared to charging computers’ batteries with the traditional AC adapters that come with the devices. This means much less electricity is needed to charge the same group of computer batteries, therefore saving a tremendous amount of electricity and electrical cost over the life span of the cart.
  • Does NOT require the use of traditional AC adapters
  • Pre-installed DC power sockets in each device compartment with brand- & model-specific detachable charging plugs allow a mix of devices in a single cart
  • Plug and Play—no set-up required
  • Integrated central power supply and distribution system
  • Simultaneous charging of all laptops
  • No timers or switches needed
  • Save up to 85% in energy costs


  • Entire system operates from a single, standard electrical outlet
  • 110 to 240 VAC, 47-63Hz
  • 85% efficient conversion/regulation
  • Forced convection cooling: approximately 2900Btu rejected heat
  • Automatic reset fuse on each recharge cable
  • 14-20VDC, assuring personnel safety
  • Safety Specification: UL 1012, TUV EN60950, IEC950 & UL1950 Pending
  • EMC Specification: CISPR22 (EN55022) Class B, IEC801-1,2,3,4; IEC 555-2 Pending


  • 3-year warranty on parts and labor

We Can Help Address Your Technology & Budget Needs

Contact an EarthWalk Solutions Specialist to see how!