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You are watching: How many amps does a submersible well pump draw

The house we to buy is on fine water, yet no history on the fine pump was transferred to us in the sale...such together horsepower or various other specs. I only understand it"s 100 feet under to my revolution water level because I bound a fishing load on fishing line and put it under the well casing till I heard it hit water.On heat I check out that mean residential well pumps are around 1- 1.5 horsepower. With an amp meter I"m gaining 12 running amps after ~ an early 25 amp surge. At 240v that equals 2,880 watts (or around 3.85 speech -at 746w every hp). That appears a tiny high. Does anyone know if 12 amps is around normal because that these pumps? I"m wondering if I have actually a worn down pump or agree numbers. Thanks
I assumption: v there room no well pumpers out there responding!
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The biggest well pumps I have actually seen are 2 hp in mine area however given the your water table is 100 feet down I would have to assume the the pump is 150-300 feet down and according to what I"ve uncovered online a 1.5 hp pump will pump to 275 feet ( this is for a utilitech pump top top lowes site) and also draw 11.5 amps if you have a 1.5 steed pump I"d say you"re great for recommendation a 1 hp pump will certainly draw around 9.8 amps I"m sure the numbers are different between manufacturers however hope this aided you may also be able to uncover info top top the fine at her county records office most counties store the details on file at the very least in my neck that the woods
thanks because that the reply. Ns guess it"s it s okay amp range. I"ll have to inspect those documents you mentioned and also see what they have actually on file. Strange why the math for earlier calculating the speech doesn"t come out fairly right. Offered there"s 746 watt per horsepower..a pump illustration 12 amps must be: 12amps x 240v = 2880watts / 746w = 3.85hp
. I guess this pumps room operating at greater horsepower 보다 their rating.. Uneven the 1.5hp is just a revolution rating,, together in pump no water
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More than likely the rating depends on the pump manufacturer for instance a much more expensive Wayne pump can be closer to 2 hp plus has actually a better warranty and also longer life span needed a utilitech pump from the big box stores is rated closer to its really power yet has a much shorter warranty and lifespan to compare the specs for same hp pimps from both manufacturers over there is a big difference in the lift capacity between the two
thanks because that the reply. I guess it"s it s okay amp range. I"ll have actually to check those documents you mentioned and see what they have actually on file. Strange why the math for earlier calculating the horsepower doesn"t come out quite right. Provided there"s 746 watts per horsepower..a pump illustration 12 amps should be: 12amps x 240v = 2880watts / 746w = 3.85hp. I guess these pumps space operating at greater horsepower than their rating.. Uneven the 1.5hp is simply a static rating,, together in pump no water
Your mathematics is wrong execute to not understanding the power aspect the engine is operation at. Likewise you room not acquisition your analysis at the engine so the wiring warmth loss is a aspect as well. The 3rd an most vital item is what is the discharge pressure an flow GPM at the moment of amperage an voltage measurement?
Once friend know how a device/system, operates, detect the root cause in the event chain is easy. Till then, girlfriend will constantly be chasing/repairing the effects.


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Hi,Even if it a is one old thread, that in vital to note the Kre"s comment: The power element is a very important value to understand the real power take away by a pack with windings inside. These windings have actually a characteristic called inductance that modifies the basic formula provided by Kanoa50. To exactly this formula we have to use a aspect named power Factor.When we usage a DC supply, in a passive circuit (no transistors or electronics), the present is stable in a really short time. With no voltage variations, no current variations.When an alternative current is used, over there is a continuos variation in the voltage applied (60 times per second) and also of food in the current (Amps) circulating. In the situation of a pure resistive load, the voltage variations are followed by proportional current variations at exactly the exact same time. Voltage and also current room in phase.When the load consists of coils or windings (as in motors or transformers) and are fed v AC, this coils react sending out a voltage in the opposite direction, reduce the efficient voltage applied. This reaction bring away a time therefore the present increases a small after the voltage raises. It is the existing lag through respect come the voltage and also this value in a trigonometric representation forms an angle who cosine is named cos φ (cos Phi)or strength factor.This PF varies in a motor or transformer according to the fill applied. The cosine duty varies indigenous 0 come 1, yet in the typical electrical loads it is common to uncovered values in between 0.4 come 0.95 (+or-) and is the element that reduces the Volts x Amps product. At much less load, less power factor. Volts x Amps = noticeable power in VA or KVAVolts x Amps x cos φ = genuine power watts or KW.In this case, assuming a PF = 0.8Apparent power: 240 V x 12 Amp = 2880 VA or 2.8 KVAReal power: 240 V x 12 Amp x 0.8 = 2304 watt or 2.304 KWBut...This is the real power absorbed by the motor, but this motor is no perfect, the dissipates heat, electromagnetic waves, mechanically vibrations, noise etc etc. All this energy waste originates from our just arrive 2304 Watts, so the mechanical output in the type of a rotational force used to the pump"s obelisk can"t it is in the very same as the entry power. The relationship in between the calculation power and the input power is the efficiency and also it will never ever reach the unit (100%).In this case assuming an 80% efficiency :Input strength x Eff. = strength in the shaft2304 watt x 0.8 = 1843 Watts1843 watts / 746 W/Hp= 2.47 HPThis is just an approximation, suspect PF and Eff. This values adjust ,as Kre explains, through the circulation of water (GPM) and the pressure (PSI). Every pump has its own set of curves that determine most of the variables uncovered on it. Regards