To run a 3000w generator how many HP needed?

Answer 1

In a perfect world, one HP equals 746 Watts. You will need 4 HP - in a perfect world.

The norm for commercial generators is closer to 680 watts per HP - due to the efficiency of the generator, heat, friction and all that other nasty stuff. That brings us up to 4.4 HP.
If your looking for reliability and long life, you don't want to operate at 100% engine output all the time - which is the case if the generator is taxed to full output.

You should be in excellent shape with a 5 HP engine.

Answer 2

One horsepower is 745.6 watts, so
3000/745.6 = 4.023 HP. But note that this does *not* take into account any mechanical or thermal losses. To be on the safe side, I'd use about a 5 HP motor.


Doug

Answer 3

1 hp = 746 watts

Assuming the generator were 80% efficient, you would need 5 horsepower.

Answer 4

Typically, to avoid the surge problem, manufacturers will power a generator at thew rate of 2hp per kw. So to be safe, you should use a 6hp engine. (this is for a 2-pole generator that must run at 3600rpm) (actually, 3650 no-load)

Answer 5

There are many other factors that go into play on this, main one being how many watts will you need continuous? I would go with a 5.5, that will give you a higher continuous rating.