« Reply #5 on: November 18, 2008, 03:53:34 am »
most of those units have a ROI (return on investment) calculator to help you justify the cost
If you run your truck for an hour it burns x gallons of fuel vs their little APU which burns y
Replacing your EGR system can be VERY expensive
There are systems that use deep cycle batteries that are charged when you drive (they have special isolators so that only they get discharged when the engine is not running) and equalizers to properly charge all batteries when running.
Believe me, nobody is cheaper than the trucking companies - they have to squeeze every dollar and gallon of fuel
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