How Does a APU Unit Work on a Semi Truck?

A APU unit, or Auxiliary Power Unit, is a critical component to any semi-truck. It provides the truck with power while the engine is turned off, and it helps the truck run more efficiently when the engine is running.

The APU unit consists of several components which work together to provide power for the truck. The main component of an APU unit is an alternator, which takes energy from the engine and converts it into electrical energy.

This electrical energy is then used to power various electrical systems in the truck such as lights, air conditioning and navigation systems.

The APU unit also contains a diesel generator that runs on diesel fuel and generates electricity when the engine is off. This electricity runs through a series of circuits and eventually powers all of the systems in the truck. It also stores excess electricity for later use when needed.

The APU unit also includes a battery bank which stores electrical energy generated by the alternator and generator so that it can be used when needed. The battery bank helps ensure that there is always enough power available for all of the truck’s systems.

In addition to providing power for the truck’s systems, an APU unit can also help improve fuel economy by reducing idling time. By reducing idling time, a semi-truck can save fuel as well as reduce emissions from its exhaust.

Conclusion:

A APU Unit is an essential component on a semi-truck, providing power while idle or running, reducing emissions and improving fuel efficiency by reducing idling time. The main components of an APU are an alternator, diesel generator and battery bank all working together to provide reliable power for all of the truck’s systems.

Photo of author

James Gardner