Join Date: Aug 2018
Location: Lowell area, MA
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Yes, your generator should always be running at 3000 RPM, to produce 50 Hz electricity.
Horsepower = Torque times RPM.
As you put a larger load on the generator, it needs to produce more amps of current. The engine produces more torque (twisting the crankshaft harder), to meet this added demand. And even though the RPMs remain the same, the extra torque means that more power is being produced by the engine.
An analogy would be riding a bicycle, at a constant speed, in a particular gear. How hard you're pushing on the pedals is torque, and how fast the pedals are turning is your RPM.
On level ground, you don't have to push very hard on the pedals. So low torque, times a certain RPM = low power. But then you start to climb a hill, at the same speed. Now you have to push a lot harder on the pedals. So high torque, times the same certain RPM = high power that your legs are putting into the bike. But you're still going the same speed.