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You are watching: How many amps does a 1.5hp well pump draw

The house we to buy is on well water, however no background on the well pump was moved to us in the sale...such together horsepower or other specs. Ns only understand it"s 100 feet under to my revolution water level due to the fact that I bound a fishing load on fishing line and put it down the well casing till I heard the hit water.On line I see that typical residential well pumps are about 1- 1.5 horsepower. V an amp meter I"m acquiring 12 running amps after ~ an early 25 amp surge. At 240v that equates to 2,880 watts (or around 3.85 speech -at 746w per hp). That seems a small high. Walk anyone recognize if 12 amps is about normal for these pumps? I"m wondering if I have a tired pump or acceptable numbers. Thanks
I guess: v there room no well pumpers out there responding!


The biggest well pumps I have actually seen room 2 hp in my area but given the your water table is 100 feet down I would need to assume that the pump is 150-300 feet down and according come what I"ve discovered online a 1.5 hp pump will certainly pump to 275 feet ( this is for a utilitech pump top top lowes site) and also draw 11.5 amps if you have actually a 1.5 horse pump I"d to speak you"re good for referral a 1 hp pump will draw about 9.8 amps I"m sure the numbers are different between manufacturers but hope this helped you may likewise be maybe to uncover info ~ above the fine at her county records office many counties keep the information on document at the very least in mine neck the the woods
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 also see what they have on file. Strange why the math for back calculating the horsepower doesn"t come out quite right. Offered there"s 746 watts per horsepower..a pump illustration 12 amps must be: 12amps x 240v = 2880watts / 746w = 3.85hp
. Ns guess these pumps room operating at greater horsepower 보다 their rating.. Unless the 1.5hp is just a static rating,, together in pump no water

More than likely the rating counts on the pump manufacturer for circumstances a an ext expensive Wayne pump could be closer to two hp plus has a better warranty and also longer life expectations needed a utilitech pump from the huge box shop is rated closer to its really power but has a much shorter warranty and also lifespan comparing the specs for exact same hp pimps indigenous both manufacturers over there is a huge difference in the lift capacity between the two
thanks because that the reply. Ns guess it"s it s okay amp range. I"ll have actually to examine those records you mentioned and see what they have on file. Weird why the mathematics for earlier calculating the speech doesn"t come out quite right. Offered there"s 746 watt per horsepower..a pump drawing 12 amps should be: 12amps x 240v = 2880watts / 746w = 3.85hp. Ns guess this pumps are operating at higher horsepower 보다 their rating.. Unless the 1.5hp is simply a static rating,, as in pumping no water
Your mathematics is wrong carry out to not knowing the power factor the motor is operation at. Additionally you space not acquisition your reading at the engine so the wiring heat loss is a element as well. The 3rd an most crucial item is what is the discharge press an circulation GPM at the moment of amperage one voltage measurement?
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Hi,Even if the a is an old thread, it in essential to keep in mind the Kre"s comment: The power factor is a an extremely important value to recognize the real power bring away by a pack with windings inside. This windings have a characteristic called inductance the modifies the simple formula provided by Kanoa50. To exactly this formula we have to use a aspect named strength Factor.When we use a DC supply, in a passive circuit (no transistors or electronics), the current is secure in a very short time. With no voltage variations, no present variations.When an alternating current is used, there is a continuos variation in the voltage applied (60 times every second) and 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 precisely the very same time. Voltage and also current room in phase.When the load has coils or windings (as in motors or transformers) and are fed through AC, these coils react sending out a voltage in opposing direction, to reduce the efficient voltage applied. This reaction takes a time for this reason the current increases a little after the voltage raises. That is the current lag v respect to the voltage and also this worth in a trigonometric representation forms an angle whose cosine is called cos φ (cos Phi)or power factor.This PF different in a motor or transformer according to the fill applied. The cosine duty varies indigenous 0 to 1, but in the typical electrical lots it is common to found values between 0.4 come 0.95 (+or-) and also is the variable that reduce the Volts x Amps product. At much less load, much less power factor. Volts x Amps = apparent power in VA or KVAVolts x Amps x cos φ = actual power watts or KW.In this case, suspect 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 soaked up by the motor, however this engine is no perfect, the dissipates heat, electromagnetic waves, mechanically vibrations, noise and so on etc. All this energy waste originates from our just arrived 2304 Watts, so the mechanical calculation in the kind of a rotational force applied to the pump"s tower can"t it is in the very same as the input power. The relationship between the calculation power and also the input strength is the efficiency and it will never reach the unit (100%).In this situation assuming an 80% efficiency :Input power x Eff. = power in the shaft2304 watts x 0.8 = 1843 Watts1843 watt / 746 W/Hp= 2.47 HPThis is only an approximation, suspect PF and also Eff. This values adjust ,as Kre explains, through the circulation of water (GPM) and the push (PSI). Every pump has actually its own collection of curves that determine most the the variables uncovered on it. Regards