Other Forms of Transport
Where the elimination of exhaust emissions or noise is particularly important (such as yachts, camper vans), fuel cells and photovoltaic modules are used as APUs for electricity generation.
APUs are also installed on some diesel locomotives, allowing the prime mover to be shut down during extended idle periods, while providing power and heat to maintain air pressure and keep the batteries charged and the engine coolant water from freezing.
Read more about this topic: Auxiliary Power Unit
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