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One HP = 753 watts, so the simplest formula to get your answer would be:

kW = HP/0.753

But that assumes 100% efficiency & a 1.0 power factor. Motors on compressors typically have a power factor of .7, but that can vary from .4 to .8 The power factor is the algebraic form of the nonlinear relationship between watts and volt-amps in an AC system. Always assume that a generator's rating is actually volt-amps and not watts, and you won't have a problem with your loads.

You should also add in a safety factor. So, the formula would be:

kW = SF * ( 1 / efficiency ) * ( 1 / PF ) * ( HP / .753 )

Putting in some typical real world values:

kW = 1.25 * ( 1 / 0.8 ) * ( 1 / 0.7 ) * ( HP / 0.753 )

I don't have a calculator handy so I'll let somebody else punch the numbers :-)

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Q: What power generator would you need to run a 2.5 hp 50 liter 110v compressor?
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How would you make a patch cord to go from a 220V 30-amp 4-wire generator to run a 220V 20-amp 3-wire portable compressor?

Identify the neutral wire on the generator. This will be the unused conductor to run the compressor. The ground and line1, line 2 are all that are needed.


If my house has a 200 amp line what size generator would it take to run the house and have the same power?

Your house runs nowhere near 200 amps, so you need to make a list of appliances and fixtures that you use, or that you will need while the generator is running, and add their power consumption together. Add some extra capacity for growth and so the generator is not always at full power. Then talk to dealers about generators with the amount of power you need. To run the house on a generator with the same capacity as the service that you have in your house you would need a 50 Kilowatt generator.


What size generator would power a two bedroom house?

I power my home from a 7000 watt generator. It connects to a 12 circuit transfer panel. Backup power is supplied to the well pump, fridge, freezer, furnace, microwave and toaster ovens, television, computer, and several lights.


If you average 2000 kw of usage per month what size generator do you need?

You would need to size your generator to power the items that you need to power during a power outage (freezer, refrigerator, etc.). The fewer items you need to power the smaller the generator you can get. Items such as water heaters, air conditioners/heat pumps and electric furnaces use more energy than most smaller generators can supply. Any one item plugged into a 15 amp outlet would use less than 2000 watts each (max). A 5000 watt (continuous rating) generator should have no problem powering a refrigerator, a freezer and a few lights. Larger items like A/C, water heaters and electric furnaces would need to be turned off for a generator this size.


Do you need an electrician to install a portable generator?

Yes, you need an electrician to install a power generator and it is very important that he is licensed otherwise it would not work/is not legal. Hire the licensed electrician to install a transfer switch.

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How do I change to a gas power generator?

If you were wanting to change an electric power generator to a gas power generator, I would probably not do it on my own. Instead I suggest you call a professional to change it for you.


Where can I find information that compares a gas generator versus an electric generator?

A gas generator generates electricity and can be used as a backup in a power outage. I am not certain what you mean by an electric generator. If there was a power outage, how would an electric generator work?


Is an electric power generator safer than a natural gas powered generator?

You can purchase an electric power generator, but it won't do you much good if the electric goes out. A kerosene or deisel generator would be a better choice.


Where do you buy power generators?

Power generators are available at Home Depot, Rona and Canadian Tire. Amazon have a generator buying guide that would explain what is a power generator.


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The governor controls the speed of the power source rotating the generator. This has to be continually adjusted to match the load on the generator. As more load is switched on, the generator becomes harder to turn, this would cause the generator to slow down, unless the power unit is adjusted to increase power and correct the speed.


What size generator do you need to move a 30 hp electric motor?

A 5 kW generator would turn it over but if the full 30 hp of mechanical power is needed, that would require about 30 kW of electric power from the generator.


Champion Generator ?

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When would you use a standby generator?

You would use a standby generator as a back up electricity source when there are outages of electric power. Business such as factories and also offices would have a standby generator in place.


How would you make a patch cord to go from a 220V 30-amp 4-wire generator to run a 220V 20-amp 3-wire portable compressor?

Identify the neutral wire on the generator. This will be the unused conductor to run the compressor. The ground and line1, line 2 are all that are needed.


Is a gas generator better than electric?

The purpose of a generator is to generate electricity. An electric generator would be redundant. It would need electricity to make electricity and when there is a power outage there is not electricity.


Where can I find a backup power generator?

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Why is there no power going to the compressor?

Assuming you are asking about the ac compressor, there would be two possibilities, blown fuse or low on freon.