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Amp/Volt relationship; Cost to Operate
3-Phase Motors:
Amps=(HP x 746)/(Volts x 1.732 x Eff x PF)
Cost to operate motor for H hours:
Cost=Energy cost in dollars per KWH x Hours x (HPx746)/(1,000 x Eff x PF)
Example:
How much would it cost to operate a 20hp motor for 6,000hrs assuming 90% efficiency, .9 power factor and power cost of $.12/KWH?
Cost = $.12 x 6,000 x (20 x 746) / (1,000 x .9 x .9) = $ 13,262
For the above equations:
HP = Horsepower
Eff = Efficiency
PF = Power Factor
H = Hours of operation
Alternately:
Annual Electric Motor Energy Costs Based on 6,000hr/yr, 90%Eff, 90%P.F.; Does not include demand charges.
| BHP |
$.08/KWH |
$.10KWH |
$.12KWH |
$.14KWH |
| 1
| $442 |
$553 |
$663 |
$774 |
| 3
| 1,326 |
1,659 |
1,989 |
2,322 |
| 5
| 2,210 |
2,765 |
3,315 |
3,870 |
| 7.5
| 3,315 |
4,148 |
4,973 |
5,805 |
| 10
| 4,420 |
5,530 |
6,630 |
7,740 |
15 |
6,630 |
8,295 |
9,945 |
11,610 |
| 20 |
8,840 |
11,060 |
13,260 |
15,480 |
| 25 |
11,050 |
13,825 |
16,575 |
19,350 |
| 30 |
13,260 |
16,590 |
19,890 |
23,220 |
| 40 |
17,680 |
22,120 |
26,520 |
30,960 |
| 50
| 22,100 |
27,650 |
33,150 |
38,700 |
| 60 |
26,520 |
33,180 |
39,780 |
46,440 |
| 75
| 33,150 |
41,475 |
49,725 |
58,050 |
| 100
| 44,200 |
55,300 |
66,300 |
77,400 |
Adapted from Vilter "Rule of Thumb" wallet Card
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