sump pump

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sump pump

Postby bob » Fri May 02, 2014 1:13 pm

Hello:
I'm new to this site & need to know what is the starting amp's for a LSP 0311 Sump Pump . I see the running amp's are 2.9 , but for back up generator use I need starting amp's. Most pump's are 3x running which would put this pump around 9
amp's. That would be exceptional.
Thank you
bob
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Re: sump pump

Postby dlamp67 » Fri May 02, 2014 2:39 pm

Unfortunately, I cannot accurately answer the question. The motor name plate data does not reference a motor code, therefore, I do not know what kVA code to use to perform the calculation. Usually, we will recommend 2 1/2 times the motor horsepower for generator sizing, therefore, a 1000 watt generator would be used to start the pump.
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Re: sump pump

Postby bob » Sat May 03, 2014 10:48 am

Thank you for the reply:
This pump should fall well within the range of my Yamaha 2000. I don't know why this measurement is not more available
on most pump's ?
bob
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Re: sump pump

Postby dlamp67 » Mon May 05, 2014 8:51 am

Typically, motor manufacturers do not reference a starting amp value. It is really calculated as starting kVA. When sizing generator applications, it is more important to know the starting kVA than the starting amps. Usually, locked rotor amps will equate to starting kVA, therefore, you can use that value instead.
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Re: sump pump

Postby bob » Mon May 05, 2014 10:37 am

What exactly is " KVA " ? Is that generally on the nameplate of the sump pump ?
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Re: sump pump

Postby dlamp67 » Mon May 05, 2014 11:46 am

kVA is not normally a value listed on a motor data plate. This is calculated based on motor letter code, voltage, motor efficiency, power factor and horsepower. kVA represents "Kilovolt Amps". On small horsepower motors like yours, normally, it is irrelevant, unless, you are using a small portable generator to start the motor along with other appliances.

Based on generator sizing software, the .33 HP motor would take 1.2KW to get it started and will run at approximately 600 watts.
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