When sizing a generator set based on kVA output, understanding the corresponding amperage is crucial for proper load management and system design. As an example, at 400 V (line-to-line) and 50 Hz, a 100 kVA generator can supply roughly 144 A per phase, while a 500 kVA unit can provide about 722 A per phase under similar conditions. These values will differ slightly based on system voltage, frequency, and power factor, making precise calculations and verification essential to ensure reliable and efficient generator operation.
SIZING TABLE – KW, VOLTAGE, AMPERAGE
3 PHASE AMPERES – 80% POWER FACTOR*
kW Times 1000 divided by (Volts*1.73) *.80
| kVA |
kW |
120 |
208 |
220 |
240 |
277 |
480 |
|
5 |
4 |
24.1 |
13.9 |
13.1 |
12.0 |
10.4 |
6.0 |
|
6 |
5 |
30.1 |
17.4 |
16.4 |
15.1 |
13.0 |
7.5 |
|
9 |
7 |
42.1 |
24.3 |
23.0 |
21.1 |
18.3 |
10.5 |
|
11 |
9 |
54.2 |
31.3 |
29.6 |
27.1 |
23.5 |
13.5 |
|
13 |
10 |
60.2 |
34.7 |
32.8 |
30.1 |
26.1 |
15.1 |
|
15 |
12 |
72.3 |
41.7 |
39.4 |
36.1 |
31.3 |
18.1 |
|
19 |
15 |
90.3 |
52.1 |
49.3 |
45.2 |
39.1 |
22.6 |
|
25 |
20 |
120.4 |
69.5 |
65.7 |
60.2 |
52.2 |
30.1 |
|
31 |
25 |
150.5 |
86.8 |
82.1 |
75.3 |
65.2 |
37.6 |
|
34 |
27 |
162.6 |
93.8 |
88.7 |
81.3 |
70.4 |
40.6 |
|
38 |
30 |
180.6 |
104.2 |
98.5 |
90.3 |
78.3 |
45.2 |
|
44 |
35 |
210.7 |
121.6 |
115.0 |
105.4 |
91.3 |
52.7 |
|
45 |
36 |
216.8 |
125.1 |
118.2 |
108.4 |
93.9 |
54.2 |
|
50 |
40 |
240.8 |
139.0 |
131.4 |
120.4 |
104.3 |
60.2 |
|
56 |
45 |
271.0 |
156.3 |
147.8 |
135.5 |
117.4 |
67.7 |
|
63 |
50 |
301.1 |
173.7 |
164.2 |
150.5 |
130.4 |
75.3 |
|
69 |
55 |
331.2 |
191.1 |
180.6 |
165.6 |
143.5 |
82.8 |
|
75 |
60 |
361.3 |
208.4 |
197.1 |
180.6 |
156.5 |
90.3 |
|
81 |
65 |
391.4 |
225.8 |
213.5 |
195.7 |
169.5 |
97.8 |
|
88 |
70 |
421.5 |
243.2 |
229.9 |
210.7 |
182.6 |
105.4 |
|
94 |
75 |
451.6 |
260.5 |
246.3 |
225.8 |
195.6 |
112.9 |
|
100 |
80 |
481.7 |
277.9 |
262.7 |
240.8 |
208.7 |
120.4 |
|
106 |
85 |
511.8 |
295.3 |
279.2 |
255.9 |
221.7 |
128.0 |
|
113 |
90 |
541.9 |
312.6 |
295.6 |
271.0 |
234.8 |
135.5 |
|
125 |
100 |
602.1 |
347.4 |
328.4 |
301.1 |
260.8 |
150.5 |
|
138 |
110 |
662.3 |
382.1 |
361.3 |
331.2 |
286.9 |
165.6 |
|
144 |
115 |
692.4 |
399.5 |
377.7 |
346.2 |
300.0 |
173.1 |
|
156 |
125 |
752.6 |
434.2 |
410.5 |
376.3 |
326.1 |
188.2 |
|
175 |
140 |
843.0 |
486.3 |
459.8 |
421.5 |
365.2 |
210.7 |
|
188 |
150 |
903.2 |
521.1 |
492.6 |
451.6 |
391.3 |
225.8 |
|
194 |
155 |
933.3 |
538.4 |
509.1 |
466.6 |
404.3 |
233.3 |
|
206 |
165 |
993.5 |
573.2 |
541.9 |
496.7 |
430.4 |
248.4 |
|
213 |
170 |
1023.6 |
590.5 |
558.3 |
511.8 |
443.4 |
255.9 |
|
219 |
175 |
1053.7 |
607.9 |
574.8 |
526.9 |
456.5 |
263.4 |
|
238 |
190 |
1144.0 |
660.0 |
624.0 |
572.0 |
495.6 |
286.0 |
|
250 |
200 |
1204.2 |
694.8 |
656.9 |
602.1 |
521.7 |
301.1 |
|
288 |
230 |
1384.9 |
799.0 |
755.4 |
692.4 |
599.9 |
346.2 |
|
313 |
250 |
1505.3 |
868.4 |
821.1 |
752.6 |
652.1 |
376.3 |
|
375 |
300 |
1806.4 |
1042.1 |
985.3 |
903.2 |
782.5 |
451.6 |
|
438 |
350 |
2107.4 |
1215.8 |
1149.5 |
1053.7 |
913.0 |
526.9 |
|
500 |
400 |
2408.5 |
1389.5 |
1313.7 |
1204.2 |
1043.4 |
602.1 |
|
563 |
450 |
2709.5 |
1563.2 |
1477.9 |
1354.8 |
1173.8 |
677.4 |
|
625 |
500 |
3010.6 |
1736.9 |
1642.1 |
1505.3 |
1304.2 |
752.6 |
|
750 |
600 |
3612.7 |
2084.3 |
1970.6 |
1806.4 |
1565.1 |
903.2 |
|
813 |
650 |
3913.8 |
2257.9 |
2134.8 |
1956.9 |
1695.5 |
978.4 |
|
938 |
750 |
4515.9 |
2605.3 |
2463.2 |
2257.9 |
1956.3 |
1129.0 |
1 PHASE AMPERES – 100% POWER FACTOR
(kW Times 1000) divided by Volts
| kVA |
kW |
120 |
240 |
|
6 |
5 |
42 |
21 |
|
10 |
8 |
67 |
33 |
|
13 |
10 |
83 |
42 |
|
19 |
15 |
125 |
63 |
|
25 |
20 |
167 |
83 |
|
31 |
25 |
208 |
104 |
|
34 |
27 |
225 |
113 |
|
38 |
30 |
250 |
125 |
|
44 |
35 |
292 |
146 |
|
50 |
40 |
333 |
167 |
|
56 |
45 |
375 |
188 |
|
63 |
50 |
417 |
208 |
|
75 |
60 |
500 |
250 |
|
81 |
65 |
542 |
271 |
|
94 |
75 |
625 |
313 |
|
100 |
80 |
667 |
333 |
|
125 |
100 |
833 |
417 |
|
156 |
125 |
1042 |
521 |
|
188 |
150 |
1250 |
625 |
|
219 |
175 |
1458 |
729 |
|
250 |
200 |
1667 |
833 |
|
281 |
225 |
1875 |
938 |
|
288 |
230 |
1917 |
958 |
|
325 |
260 |
2167 |
1083 |
|
344 |
275 |
2292 |
1146 |
|
375 |
300 |
2500 |
1250 |
|
438 |
350 |
2917 |
1458 |
|
500 |
400 |
3333 |
1667 |
|
531 |
425 |
3542 |
1771 |
|
563 |
450 |
3750 |
1875 |
|
625 |
500 |
4167 |
2083 |
AMP
CONVERSIONS:
For kW, take WATTS and divide by 1000
POWER (WATTS) = VOLTS times AMPERES
AMPERES = POWER (WATTS) divided by VOLTS
VOLTS = POWER (WATTS) divided by AMPS
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