Welcome to OnlineConversion.com Forums 

Convert and Calculate Post any conversion related questions and discussions here. If you're having trouble converting something, this is where you should post. * Guest Posting is allowed. 

Thread Tools  Display Modes 
#1




Amps To Kilowatts
How Do You Determine Kilowatts From Amps? I Have 288 Amps How Do You Determine How Many Kilowatts That Is?

#2




Re: Amps To Kilowatts
What Voltage are you assuming?
The conversion of Amps to Watts is governed by the equation Watts = Amps x Volts For example 1 amp * 110 volts = 110 watts In your case I will assume 110 volts so: 288 * 110v = 31,680 volts or 31.68 Kilowatts
__________________
http://www.thesmartfisherman.com The early bird gets the worm "But, The SECOND mouse gets the cheese" 
#3




Re: Amps To Kilowatts
You made an error in the reply that makes it confusing
288A * 110V = 31,680 Watt but 288A on a 110V grid is unlikely; I would expect it is 480V in a three phase grid; that makes it even more difficult :) 
#4




Re: Amps To Kilowatts
Quote:
__________________
http://www.thesmartfisherman.com The early bird gets the worm "But, The SECOND mouse gets the cheese" 
#5




Re: Amps To Kilowatts
Quote:
I Have 400 Amps How Do You Determine How Many Kilowatts That Is? at 3phase 208volts 
#6




Re: Amps To Kilowatts
400amps @ 3p208
400*(3*208)=249,600w 249,600/1000=249.6 
#7




Kilowatts to amps
i hav motor for machine 380 v /3 phas /30 kw i whant know how many amps this motor ned

#8




Re: Kilowatts to amps
Quote:
I will assume it is line to neutral 30 kW/380 V = 78.9 A That is the sum of the three phase currents, each phase is 26.3 A, assuming the load is balanced. (It may need higher current during starting.) Edit: It is actually more likely that it is 219 V line to neutral and 380 line to line. 30 kW/219 V = 137 A, 45.7 A in each phase (assuming balanced load) Last edited by JohnS; 04102009 at 05:34 AM. 
#9




Re: Kilowatts to amps
Quote:
Amps. That being said, overcurrent protection will have to be sized to carry momentary starting load of about 250%. This could be even higher in an application with large inertial loading. The calculation is assuming 100% efficiency as well, so you need to know if 30kW is the size of the motor or the consumption under load and divide the current figure by efficiency. Note that the square root of the phasing is used as actual voltage (an hence current) in a three phase circuit is 120 electrical degrees apart so the actual currents peak 1/150 of a second apart in 50 Hz or 1/180 of a second at 60 Hz. Motor name plate data should indicate FLA (full load amps) and LRA (locked rotor amps). Local code requirements or good engineering practice will dictate wire size and overcurrent protection. Sounds like you are looking at wire in the #6 AWG range (~15 sq mm) with an increase in size of (~5 sq mm) for each 30m increase in length. Of course that's looking at it from half a world away. Last edited by MJWorner; 04132009 at 05:59 AM. 
#10




Re: Amps To Kilowatts
Quote:
You have to take the square root of the phases because they don't peak simultaneously but sequentially 1/180 of a second apart. 
Thread Tools  
Display Modes  

