Increasing the speed of an engine from 1500 RPM to 3000 RPM while halving the horsepower of the engine that operates an alternator is generally not feasible. The electrical load on the alternator dictates the mechanical power input required. As the RPM increases, the electrical load typically increases as well, meaning that the power requirement does not decrease as suggested.
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Welcome to PF!aa_0004 said:is it possible by increasing speed to 3000 rpm from 1500 rpm and reduce the hp half of engine that operates the alternator(for example in case 15hp engine reduce to 7.5hp for doing same work by doubling the rpm)?