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#1
01-18-2010, 07:45 PM
 Unregistered Guest Posts: n/a
Convert kVA to kWh

Is it possible to convert 20kVA into kWhs?
#2
01-19-2010, 03:17 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,225 Rep Power: 18
Re: Convert kVA to kWh

Quote:
 Originally Posted by Unregistered Is it possible to convert 20kVA into kWhs?
Not directly. You need to know two things.

1) Power factor: In ac electrical systems, the current and voltage may not be exactly in phase. The product of voltage x current x cos(phase angle) is power. However, the portion of current that is not in phase still costs the electric company money to transmit. So they may base their rates on kVA, not on kW for commercial contracts, in essence, charging you as though the current was in-phase and represented power. (The user can install components that improve the power factor to minimize cost, and this is his incentive to do so.) When the power factor is one, kVA and kW are the same thing.

2) Time: kWh is the product of power and time. It is 1 kW for an hour, use it for two hours and it will be 2 kWh

It won't be a perfect estimate, but you can assume the power factor is 1, so 20 kVA = 20 kW and multiply by the hours run to get kWh.
#3
04-23-2011, 11:27 PM
 Unregistered Guest Posts: n/a
Re: Convert kVA to kWh

Quote:
 Originally Posted by Unregistered Is it possible to convert 20kVA into kWhs?
KWhr for 500 kva
#4
05-11-2011, 07:48 AM
 sajrk02@yahoomail.com Guest Posts: n/a
Re: Convert kVA to kWh

Quote:
 Originally Posted by Unregistered Is it possible to convert 20kVA into kWhs?
ok 20/.8=25 generaly
#5
07-25-2011, 08:15 PM
 calvin01 Guest Posts: n/a
Re: Convert kVA to kWh

I have a breaker panel in which we have increased the power factor 20 - 25 % meaning the total amp load before installing our inductive load capacitor 96 total amps after installation the total load draw reduced to 72 total amp draw which indicates a 7.5 -10% reduction. How does that convert into KWH ?
#6
07-26-2011, 11:36 AM
 HerrWarum Supreme Member Join Date: May 2011 Location: MD, USA Posts: 303 Rep Power: 3
Re: Convert kVA to kWh

Quote:
 Originally Posted by calvin01 I have a breaker panel in which we have increased the power factor 20 - 25 % meaning the total amp load before installing our inductive load capacitor 96 total amps after installation the total load draw reduced to 72 total amp draw which indicates a 7.5 -10% reduction. How does that convert into KWH ?
If you have a two channel o'scope and a shunt you can check the phase angle between voltage and current. Don't forget your arc-flash gear.

If your capacitors have brought the PF to 1.0 then the KWH = voltage x hours x 0.072 KA. For 240 V it'd be kwh = 17 x hours.

Last edited by HerrWarum; 07-26-2011 at 12:06 PM.
#7
12-07-2011, 11:50 PM
 Unregistered Guest Posts: n/a
Re: Convert 72kVA to kWh=

72kvar witch kwh=
#8
12-08-2011, 03:27 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,225 Rep Power: 18
Re: Convert 72kVA to kWh=

Quote:
 Originally Posted by Unregistered 72kvar witch kwh=
See post #2.
However, the "r" in kVAr means it is ONLY the reactive or out of phase component, therefore 0 kW. You need the in-phase component for power.
#9
12-24-2011, 11:40 AM
 Unregistered Guest Posts: n/a
Re: Convert kVA to kWh

Quote:
 Originally Posted by Unregistered Is it possible to convert 20kVA into kWhs?
14000kva to kilowatt
#10
12-24-2011, 12:19 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,225 Rep Power: 18
Re: Convert kVA to kWh

Quote:
 Originally Posted by Unregistered 14000kva to kilowatt
If the voltage and current are in phase (power factor = 1), 14000 kVA is 14000 kW.
Otherwise, multiply by the power factor (which is less than one) or by the cosine of the phase angle.

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