The APU does charge the truck batteries. And try to equal the weight, but having more weight on the back would created higher fuel consumption.
I'm sure someone will correct me if I'm wrong.
On tractor trailers, and APU is a small diesel engine that powers a heat and air conditioning unit while charging the truck's main batteries at the same time. This allows the driver to remain comfortable in the cab and have access to electric power without running the main truck engine.
Having an APU helps save money in fuel costs and saves wear and tear on the main engine, though they tend to be expensive to install and maintain. Therefore only a very small percentage of the trucks on the road today come equipped with an APU.
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Not sure if I should start a new thread for new questions, but here's a couple.
When I have my APU running is that charging the truck battery? I ask because I have my phone connected to the truck radio via Bluetooth, and would like to run it in standby when I'm in the sleeper so I can use the truck speakers for movies and music.
Also wondering if I should have more weight on the tractor or trailer for better fuel mileage.
PS, it's not a hula girl or bobble dog but here's my dash buddies.
APU:
Auxiliary Power Unit
On tractor trailers, and APU is a small diesel engine that powers a heat and air conditioning unit while charging the truck's main batteries at the same time. This allows the driver to remain comfortable in the cab and have access to electric power without running the main truck engine.
Having an APU helps save money in fuel costs and saves wear and tear on the main engine, though they tend to be expensive to install and maintain. Therefore only a very small percentage of the trucks on the road today come equipped with an APU.