Hp to VA – Calculator, formula, conversion 1 phase, 2 phase, 3 phase

With this tool you can convert from HP to VA easily, quickly and free any electric power, the calculation takes into account the power factor.

For greater ease we explain that formula is used for the calculation, and how to convert from hp to va in just 3 steps.

If you do not know the power factor and efficiency of the load in this section we give you the most common values: “power factor” and “efficiency”.

HP to VA conversion formula:formula hp to va

  • H.P=Horsepower.
  • E=Efficiency.
  • P.F=Power factor.
  • VA=Volt-Ampere

How to convert Hp to VA in only 3 step:

Step 1:

Multiply Hp (Horsepower) by 746. Example, if you have 100 hp multiply by 746 and you get 74600.

Step 2:

Multiply the Power factor by the motor efficiency. For example, if the motor is an efficiency of 80% and the power factor is 0.9, it must Multiply 0.8 (80%) by 0.9 to obtain 0.72 (0.9×0.8) = 0,72.

Step 3:

Divide step 1 between step 2, the result will be: 103.611VA ((100×0.746)/(0.9×0.8) = 103.611VA).

Definition S (VA), F.P, H.P and Efficiency:

VA: A volt-ampere, commonly referred to as a VA, is commonly used as a unit of power in obtaining the electrical capacity of circuit breakers, uninterrupted power supplies and wirings.

VA is larger than Watts because loads are inductive such as motors, discharge lighting, reactors and more current is required to keep the magnetic field energized than is -turned into heat (W).

Inductive devices or loads such,. as tansformers and motors having power factor less than 1.0 are generally rated in VA.

Hp: The horsepower (hp) is a unit in the foot-pound-second ( fps ) or English system, sometimes used to express the rate at which mechanical energy is expended. It was originally defined as 550 foot-pounds per second (ft-lb/s). Defined by James Watt (1736-1819) the inventor of first practical steam engine.

A power level of 1 hp is approximately equivalent to 746 watt s (W) or 0.746 kilowatt s (kW).

Motor Efficiency: Electric motor efficiency is the ratio between power output (mechanical) and power input (electrical).

Mechanical power output is calculated based on the torque and speed required (i.e. power required to move the object attached to the motor), and electrical power input is calculated based on voltage and current supplied to the motor.

Mechanical power output is always lower than the electrical power input, as energy is lost during conversion (electrical to mechanical) in various forms, such as heat and friction. Design of an electric motor aims to minimize these losses to improve efficiency.

P.f: Power factor is the ratio of working power to apparent power. It measures how effectively electrical power is being used. A high power factor signals efficient utilization of electrical power, while a low power factor indicates poor utilization of electrical power.

Power Factor is the cosine of the phase angle between current and voltage.
Power Factor is the ratio of true power to apparent power.

Typical Un-improved Power Factor by Industry:

Industry Power Factor
Auto Parts 0.75-0.80
Brewery 0.75-0.80
Cement 0.80-0.85
Chemical 0.65-0.75
Coal Mine 0.65-0.80
Clothing 0.35-0.60
Electroplating 0.65-0.70
Foundry 0.75-0.80
Forging 0.70-0.80
Hospital 0.75-0.80
Machine Manufacturing 0.60-0.65
Metalworking  0.65-0.70
Office Building 0.80-0.90
Oil field Pumping 0.40-0.60
Paint Manufacturing 0.65-0.70
Plastic 0.75-0.80
Stamping 0.60-0.70
Steel Works 0.65-0.80
Tool, dies, jigs industry 0.65-0.75

Typical power factor of common household electronics:

Electronics device Power Factor
Magnavox Projection TV – standby 0,37
Samsung 70″ 3D Bluray 0,48
Digital Picture Frame 0,52
ViewSonic Monitor 0,5
Dell Monitor 0,55
Magnavox Projection TV 0,58
Digital Picture Frame 0,6
Digital Picture Frame 0,62
Digital Picture Frame 0,65
Philips 52″ Projection TV 0,65
Wii 0,7
Digital Picture Frame 0,73
Xbox Kinect 0,75
Xbox 360 0,78
Microwave 0,9
Sharp Aquos 3D TV 0,95
PS3 Move 0,98
Playstation 3 0,99
Element 41″ Plasma TV 0,99
Current large, flat-screen television 0,96
Windows-mount air conditioner 0,9
Legacy CRT-Based color television 0,7
Legacy flat panel computer monitor 0,64
While-LED lighting fixture 0,61
Legacy laptop power adapter 0,55
Laser Printer 0,5
Incandescent lamps 1
Fluorescent lamps (uncompensated) 0,5
Fluorescent lamps (compensated) 0,93
Discharge lamps 0,4-0,6

Typical Motor Power Factors:

Power Speed Power Factor
(hp) (rpm) 1/2 load 3/4 load full load
0 – 5 1800 0.72 0.82 0.84
5 – 20 1800 0.74 0.84 0.86
20 – 100 1800 0.79 0.86 0.89
100 – 300 1800 0.81 0.88 0.91

Reference // Power Factor in Electrical Energy Management-A. Bhatia, B.E.-2012
Power Factor Requirements for Electronic Loads in California- Brian Fortenbery,2014

Electrical motors constructed according NEMA Design B must meet the efficiencies below:

Power Minimum Nominal Efficiency1)
1 – 4 78.8
5 – 9 84.0
10 – 19 85.5
20 – 49 88.5
50 – 99 90.2
100 – 124 91.7
> 125 92.4

Reference // http://www.engineeringtoolbox.com

Hp to VA conversion table:

Hp Eficiencia F.p VA
1Hp 78% 0,84F.p 1138,58VA
2Hp 78% 0,84F.p 2277,16VA
3Hp 78% 0,84F.p 3415,75VA
4Hp 78% 0,84F.p 4554,33VA
5Hp 84% 0,84F.p 5286,28VA
6Hp 84% 0,86F.p 6196,01VA
7Hp 84% 0,86F.p 7228,6VA
8Hp 84% 0,86F.p 8261,3VA
9Hp 84% 0,86F.p 9294,01VA
10Hp 85% 0,86F.p 10205,1VA
20Hp 85% 0,86F.p 20410,3VA
30Hp 88% 0,89F.p 28575VA
40Hp 88% 0,89F.p 38100,1VA
50Hp 88% 0,89F.p 47625,12VA
60Hp 90% 0,89F.p 55880,1VA
70Hp 90% 0,89F.p 65193,5VA
80Hp 90% 0,89F.p 74506,86VA
90Hp 90% 0,89F.p 83820,2VA
100Hp 90% 0,89F.p 93133,58VA
200Hp 91% 0,91F.p 180171,47VA
300Hp 92% 0,91F.p 267319,6VA
400Hp 92% 0,91F.p 356426,18VA
500Hp 92% 0,91F.p 445532,7VA
600Hp 92% 0,91F.p 534639,27VA
700Hp 92% 0,91F.p 623745,81VA
800Hp 92% 0,91F.p 712852,36VA
900Hp 92% 0,91F.p 801958,91VA
1000Hp 92% 0,91F.p 891065,4VA
1100Hp 92% 0,91F.p 980172VA
1200Hp 92% 0,91F.p 1069278,54VA
1300Hp 92% 0,91F.p 1158385,09VA
1400Hp 92% 0,91F.p 1247491,63VA
1500Hp 92% 0,91F.p 1336598,1VA
1600Hp 92% 0,91F.p 1425704,73VA
1700Hp 92% 0,91F.p 1514811,27VA
1800Hp 92% 0,91F.p 1603917,82VA

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