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Diesel engines are always rated in watts (or horsepower in North America), never in volt amperes which is the unit of apparent power and does not apply to non-electrical machines.

However, if you are referring to a diesel-driven generator, then that generator's rated output is indeed measured in volt amperes. The power delivered, in watts, depends on the power factor of the load -e.g. if the load is purely resistive, then the number of watts will be, to all intents and purposes, numerically equal to the volt amperes. For inductive loads (e.g. a motor), then the watts will always be lower than the volt amperes -how much lower, depends on the load's power factor.

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