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 Technologiesâ€™ 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.
â€œThe two 24 V products are basically an extension of the existing 12 V engine start products,â€ said Senior Business Portfolio Manager Jeff Brakley. â€œWe 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. Thereâ€™s an internal DC/DC converter and a computer board that monitors battery input voltage, the temperature, and adjusts the output voltage.â€
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 vehicleâ€™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.