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Matching a generator to a motor

What size generator to run a 7.5kw 3ph submersible pump

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You need a e 3 phase generator to run a 3 phase pump first of all. Check to see that the generator is three phase. Most are not.

Posted on Jan 18, 2009

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What size generator do I need to run a 10 hp motor


on the plate attached to the motor you will find several important items
one is the wattage of the motor
this is the maximum wattage that the motor uses when under load
the gen set will need to be at least 30% bigger than that figure
next there will the number of phases that the motor is
it will read as 1 ph or 3ph
If it is 1ph that is a single phase motor and will ru from a single phase gen set
however if it is 3ph you will need a 3ph gen set to run the motor
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Submersible pump with only two wires going to the motor. how do i connect it to the control box?


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Hi i looking for water pump 10hp single phase borehole 150feet under ground 1500gpm submersible please can you rang run on single-phase 240v thanks harry 00353860818018


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Some submersible pumps have a gray motor box to start the pump & some submersible pumps have the new style motor box built in and is not lighting proof. some 240vac are two wire and three! I would like...


The difference in the two pumps is that with a three wire pump the start and run capacitors are in the gray box. With a two wire pump the caps. are built into the motor. Because of this with a two wire pump you only need to run the 240v down the well to the pump. The yellow wire on the three wire pumps is the igh voltage wire that come from the start cap. I have used both pums but usually use the two wire because they are easier to hookup and the wire is cheaper because you only need to run three wires. (2 hots and ground) On large HP pumps you will always have three wire motors because the caps. get too big to get them in the motor. It is best to go three phase with big pump if you can.

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Appropriate size inverter for sump pumps


First...you need to find the amperage on the pump...your inverter is rated for 6.25 Amps...(750/120)...you will need an inverter bigger then the pump..I would suggest at least 1.5 times the size of the pump..bear in mind,..the inverter wasnt designed to start motors...so oversizing is needed..

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1 Answer

Potential Motor damage


Submersable pumps pull a lot of current on start up. Up to 7 times running momentarily. This is especially true of three wire pumps. ( Ground and 2 , 110V) 4 wire pumps have a capacitor start provision ( the extra wire) and a control box that greatly reduces the starting load by shifing the phase on startup.

4200 watts should handle it how ever if you have no line losses. Excess Line losses will do exactly what has happened to you. Overheated the connections and burned up the pump.

First check what gauge wire you have going from the generator to the pump and the length of the run. Check a wire gauge calculator such as http://www.denningelectronics.com/wiregauge.htm
use at least 4 times the running load for your wats and if it is a deep well pump, more than 50 feet of head from water to spickot) then use 7 times wattage. Use 5% line loss allowable,. This will probably uncover your problem as under size wire.

The other possibility is that the breaker was going bad over time and caused the voltage drop0 that destroyed the pump.

Last item you can do, check the voltage at the generator when the pump starts, it shold not drop more than 10% on start up.

Good luck

Mar 17, 2009 | Craftsman Air Tools & Compressors

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