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Old 02-28-2011, 04:58 PM   #1
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generator wattage


have a 1 hp sump pump (115 volts and 7.5 amps). what wattage portable generator is needed to start and run this pump?

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Old 03-01-2011, 12:35 AM   #2
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generator wattage


volts x amps = watts

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Old 03-01-2011, 12:36 AM   #3
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generator wattage


try a min 1000watter
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Old 03-01-2011, 02:56 AM   #4
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generator wattage


I am not suprised you may need little bigger than just a simple kilowatt generator { 1,000 watts }

What else you plan to run off this generator ?

You may want to put in a generator subpanel { legit type of transfer switch }

There are so many diffrent way it can be done and meet the codes.

For your 1 HP sump pump the smallest generator size I will use is 2000 rated watts { you will see surge watts are higher than running watts }

Expect the electric motor starting watts will be much higher than running wattage.
As you see why I rather slect the generator size little larger than it can be so that way you don't have to worry about stalling it.

There are quite few diffrent size generator and how fancy you want to all it depending on your style.

If you need more infomation on generators let us know one of us will guide ya thru.

( I have work from simple single cylinder to monster multi cylinder engine which it will have enough power to keep small/med town size lit up.)

Merci.
Marc
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Old 03-01-2011, 11:15 AM   #5
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generator wattage


Quote:
Originally Posted by Saturday Cowboy View Post
volts x amps = watts
But it's AC. You have to multiply the VA by the power factor. W = V x A x PF. Hopefully the PF is written on it; otherwise, be a pessimistic grump and assume .6. I would expect a good one like Zoeller to be better.
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Old 03-01-2011, 02:38 PM   #6
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generator wattage


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Originally Posted by operagost View Post
But it's AC. You have to multiply the VA by the power factor. W = V x A x PF. Hopefully the PF is written on it; otherwise, be a pessimistic grump and assume .6. I would expect a good one like Zoeller to be better.
Like motors, generators have a power factor and are rated in both watts and volt-amps. The "watt" ratings on most consumer generators are actually volt-amp ratings, assuming a power factor of 1 (like for halogen lighting). Running motors on a generator requires that you consider not only the starting current, but also the power factor. To account for these issues, it is generally advisable to use a generator with at least twice the volt-amp rating of your motor load. So you would want at least an 1800VA generator.

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