Midtronics BMS-100 battery management system


Battery Management System

Electrical systems are complex and critical to heavy-duty vehicle performance. The BMS-100 Battery Management System enables continuous electrical system monitoring of a heavy-duty vehicle’s entire battery and electrical system while in operation.

Ideal for managing no-idle loads, the BMS-100 system offers:

  • Relays to switch auxiliary batteries into and out of tractor battery charging system
  • Customizable software for battery loads and system profiles
  • Integrated pins provide connections to auxiliary batteries, starting batteries, CAN Bus communication, and customer-provided relays/solenoids
  • LED to indicate system status
  • Electronics are potted to provide protection against environmental damage


The BMS-100 system provides the following information:

  • Tractor starting battery voltage
  • Auxiliary battery voltage
  • Current draw to and from auxiliary battery pack
  • System temperature (battery characteristics are affected by temperature changes)
  • Auxiliary batteries State of Charge (% of charge remaining) and State of Health (% of initial full capacity remaining)
  • Run time remaining at battery instantaneous current draw

Output communication

  • j1939 can bus

maximum current rating

  • 250 amps continuous
  • 2,500 amps inrush current

Operating temperature

  • -40°F to 185°F (-40°C to 85°C)

housing material

  • pC



  • Height: 1.8 in.
  • Length: 6.4 in.
  • Depth: 3.6 in.
  • Weight: 1.5 lbs


WARNING: Cancer and Reproductive Harmwww.P65Warnings.ca.gov


Midtronics works closely with individual customers to develop custom BMS-100 solutions. Please contact your Midtronics account manager for more information.