kVA to Hp – Conversion, equation, table, convert and calculator free.

By /

With this calculator you can automatically convert from kVA to Hp , you will also find the conversion formula and some definitions.

We also explain some examples , a table of quick  equivalences , the steps on how to convert from kVA to HP and, if required, the most common power factor and efficiency .

Definition P.F, S (kva), Motor Efficiency and H.P (horsepower):

H.P: 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).

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

KVA is larger than KW 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 (KW).

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

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.

kVA to Hp calculation formula:

formula kva to HP

Typical Un-improved Power Factor by Industry:

IndustryPower Factor
Auto Parts0.75-0.80
Brewery0.75-0.80
Cement0.80-0.85
Chemical0.65-0.75
Coal Mine0.65-0.80
Clothing0.35-0.60
Electroplating0.65-0.70
Foundry0.75-0.80
Forging0.70-0.80
Hospital0.75-0.80
Machine Manufacturing0.60-0.65
Metalworking 0.65-0.70
Office Building0.80-0.90
Oil field Pumping0.40-0.60
Paint Manufacturing0.65-0.70
Plastic0.75-0.80
Stamping0.60-0.70
Steel Works0.65-0.80
Tool, dies, jigs industry0.65-0.75

Typical power factor of common household electronics:

Electronics devicePower Factor
Magnavox Projection TV – standby0,37
Samsung 70″ 3D Bluray0,48
Digital Picture Frame0,52
ViewSonic Monitor0,5
Dell Monitor0,55
Magnavox Projection TV0,58
Digital Picture Frame0,6
Digital Picture Frame0,62
Digital Picture Frame0,65
Philips 52″ Projection TV0,65
Wii0,7
Digital Picture Frame0,73
Xbox Kinect0,75
Xbox 3600,78
Microwave0,9
Sharp Aquos 3D TV0,95
PS3 Move0,98
Playstation 30,99
Element 41″ Plasma TV0,99
Current large, flat-screen television0,96
Windows-mount air conditioner0,9
Legacy CRT-Based color television0,7
Legacy flat panel computer monitor0,64
While-LED lighting fixture0,61
Legacy laptop power adapter0,55
Laser Printer0,5
Incandescent lamps1
Fluorescent lamps (uncompensated)0,5
Fluorescent lamps (compensated)0,93
Discharge lamps0,4-0,6

Typical Motor Power Factors:

PowerSpeedPower Factor
(hp)(rpm)1/2 load3/4 loadfull load
0 – 518000.720.820.84
5 – 2018000.740.840.86
20 – 10018000.790.860.89
100 – 30018000.810.880.91

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

NEMA Design B Electrical Motors Efficiency

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

Power
(hp)		Minimum Nominal Efficiency1)
1 – 478.8
5 – 984.0
10 – 1985.5
20 – 4988.5
50 – 9990.2
100 – 12491.7
> 12592.4

1) NEMA Design B, Single Speed 1200, 1800, 3600 RPM. Open Drip Proof (ODP) or Totally Enclosed Fan Cooled (TEFC) motors 1 hp and larger that operate more than 500 hours per year.

kVA to Hp conversion table:

kVAEfficiencyP.fHp
1 kVA78%0,84 P.f0,87 Hp
2 kVA78%0,84 P.f1,75 Hp
3 kVA78%0,84 P.f2,63 Hp
4 kVA84%0,84 P.f3,51 Hp
5 kVA84%0,84 P.f4,39 Hp
6 kVA84%0,86 P.f5,39 Hp
7 kVA84%0,86 P.f6,29 Hp
8 kVA84%0,86 P.f7,19 Hp
9 kVA90%0,86 P.f8 Hp
10 kVA90%0,86 P.f8,99 Hp
20 kVA92%0,86 P.f17,98 Hp
30 kVA92%0,89 P.f27,91 Hp
40 kVA92%0,89 P.f37,22 Hp
50 kVA92%0,89 P.f46,52 Hp
60 kVA92%0,89 P.f55,83 Hp
70 kVA92%0,89 P.f65,13 Hp
80 kVA92%0,89 P.f74,4 Hp
90 kVA92%0,89 P.f83,75 Hp
100 kVA92%0,89 P.f93,05 Hp
200 kVA92%0,91 P.f190,2 Hp
300 kVA92%0,91 P.f285,4 Hp
400 kVA92%0,91 P.f380,5 Hp
500 kVA92%0,91 P.f475,73 Hp
600 kVA92%0,91 P.f570,88 Hp
700 kVA92%0,91 P.f666,03 Hp
800 kVA92%0,91 P.f761,1 Hp
900 kVA92%0,91 P.f856,3 Hp
1000 kVA92%0,91 P.f951,47 Hp
1100 kVA92%0,91 P.f1046,62 Hp
1200 kVA92%0,91 P.f1141,76 Hp
1300 kVA92%0,91 P.f1236,9 Hp
1400 kVA92%0,91 P.f1332,06 Hp
1500 kVA92%0,91 P.f1427,21 Hp
1600 kVA92%0,91 P.f1522,359 Hp
1700 kVA92%0,91 P.f1617,5 Hp
1800 kVA92%0,91 P.f1712,65 Hp

Related Posts