Maxwell Technologies introduces 24-volt versions of ultracapacitor-based Engine Start Module

Maxwell 24V ultracap-based

As every truck driver or heavy equipment operator knows, diesel engines can be difficult to start in low temperatures, or after not being started for long periods. Maxwell Technologies’ Engine Start Module (ESM) is an ultracapacitor-based system that takes over the engine cranking function and remains fully charged, even if battery voltage drops.

Now Maxwell is introducing two new 24-volt versions of the ESM: the ULTRA 31/900/24V is for starting diesel engines up to 12.5 liters, and the ULTRA 31/1100/24V is for engines up to 15.0 liters.

“The two 24 V products are basically an extension of the existing 12 V engine start products,” said Senior Business Portfolio Manager Jeff Brakley. “We rearranged the connection of the ultracapacitors inside the same Group 31 form factor to provide from 24 volts up to 28.5 volts to the starter, based on temperature. There’s an internal DC/DC converter and a computer board that monitors battery input voltage, the temperature, and adjusts the output voltage.”

Unlike the 12 V ESMs, the 24 V system will mostly be marketed to OEMs. The 12 V product can simply replace one of a vehicle’s existing 12 V lead-acid batteries, but the 24 V ESM is an add-on that needs to be designed into the vehicle.

The two new 24-volt ESM models will be available in May.            

MORE: Ultracapacitors creep into the automotive industry

 

Source: Maxwell via Green Car Congress

  • Dreck Sheisse

    Nothing new to see here, folks. Just caps in a box.

    • dogphlap dogphlap

      Not sure I agree.
      If the press release is accurate the output voltage is “adjusted” so I’d assume it’s maintained at 24V which for the sort of currents required to crank a cold diesel is impressive (even if the time it can do it for is limited as it must be when you consider the energy density of super capacitors). Of course a more likely interpretation of the press release is the device adjusts the charging voltage to the capacitors (they need to be protected from over voltage) and the output to the starter motor is just raw capacitor voltage, that would be more plausible and less interesting.