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Keeping in mind that there is 746watts per Hp should lead you to the answer. For ex. Power(in KVA) = Voltage (1.73)x Current
Therefore, if you know the voltage, typically 480Vac, then 150(746) = 480 (1.73) x I
150Hp(746w/hp) = Voltage x Current
= about 135 amps current. Now you also need to factor in the Power Factor (PF) of the load (150Hp). The power factor depends on the type of load. A motor is mostly Inductive, a heater, or lighting bank is resistive, and capacitive loads aren't that common. Your question is a bit vague. If you'd like to rephrase your answer or send it directly to me, I'd be glad to assist you further. You might also want to check out a site called "Mike Holt's Code Forum'. If you're an EE student, I'm sure the path to your solution is in one of your 'Power' books.

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14y ago
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11y ago

Look at the motor's name plate,there must be the voltage that the motor will handle and in what connection i.e star or delta. If you want the motor's KVA then divide the motor's power rating with it's power factor. The power rating is on the motor's name plate too.

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11y ago

it goes: 11 hp equals 11 x 746 watts, in other words 8206 watts, or 8.2 kW. For the kVA for an induction motor you should divide by an estimated power factor of 0.75, which takes it up to 10.9 kVA, or 11-12 kVA.

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14y ago

What size genset is needed to start a 3 phase electric motor Direct on Line (DOL) start HP of
Motor = Generator
kVA Required

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9y ago

It would be a 10 kVA generator.

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12y ago

4 kva

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Q: How many KVA is required to run 5HP 3 phase motor?
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What size motor do you need to run a compressor 2 stage 80 gallon tank i have a 3 phase on it and want to change motor?

You probably need a 5hp or 7hp motor. Look for HP rating o the 3 phase motor and select the same for single phase. 3 phase has same power but is more efficient at electricity use. Also consider a 3 phase converter. It allows a 3 phase motor to run on single phase service.


Why can't I use a 5hp electic motor to turn a 10hp wheel?

Because a 5hp motor does not have enough power to turn a 10hp load.


Can you replace the 5HP 3 phase motor on your compressor with a single phase motor of the same HP?

Yes BE SURE TO Check RPM 5hp at 1800 rpm needs 25hp at 3600 rpm caveat : single phase motors are bigger physically consume more power and run at higher current (73% higher current) and take longer to get up to speed so the frame size may be different shaft size and bolt circle height of the shaft etc this is an easy task with a belt drive with the single bearing motor on some smaller compressors its impossible another possibility: small drives for 3phase motors have come down in price and may work just fine on single phase and may be cheaper than a single phase motor... can perhaps do pressure regulation by varying the speed of the motor instead of the noisy on off stop start ... fill the tank and idle speed up with demand...wont need to blow the air for the unloader soft start will increase the life of all the mechanical stuff


Can a single phase generator run a 3 phase air conditioner?

Depending on who does the work it could be less expensive than getting a different air conditioner. The compressor will also need a capacitor and some rewiring. The old unit could have a 3 phase blower motor also which could run the price up even more. Although the changes can be made, the warranty at best will probably be a one year warranty and a new unit could have a 5-10 year warranty.


How do you replace a 3 phase 5hp motor?

I assume that by two-phase, you really are talking about a supply with two hot wires and a neutral, such as 120/240 volt. This is single phase power, it just has power taps on both ends of the transformer winding, the neutral is the center tap. I don't think it is possible to convert or rewire your motor. A large 3 phase motor must be run on a 3 phase electrical supply. It will not run and will overheat if you try to connect it to a single phase supply. The only way to make a 3 phase supply from a single phase supply is to use a converter like a motor-generator set. That would be way more expensive than getting a new motor.

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