Siemens Standby Generators - Manual (Page 3)

Generator Sizing Guide
Table 1 – Motor Load Reference
AC and Heat Pumps
Running Load Starting Load
Running Amps at Amps at Amps at Starting LR Amps LR Amps LR Amps
Description Hp kW 240V 1ø 208V 3ø 480V 3ø kW at 240V 1ø at 208V 3ø at 480V 3ø
1 Ton (12,000 BTU) 1 1 5 3 1 3 25 17 7
2 Ton (24,000 BTU) 2 2 10 7 3 6 50 33 14
3 Ton (36,000 BTU) 3 3 15 10 4 9 75 50 22
4 Ton (48,000 BTU) 4 4 20 13 6 12 100 67 29
5 Ton (60,000 BTU) 5 5 25 16 7 15 125 83 36
7.5 Ton (85,000 BTU) 7.5 7.5 37 24 11 17 188 125 54
10 Ton (120,000 BTU) 5 Hp (x2) 10 49 33 14 15 125 83 36
10 Ton (120,000 BTU) 10 Hp 10 49 33 14 20 250 167 72
15 Ton (180,000 BTU) 7.5 Hp (x2) 15 74 49 21 17 188 125 54
15 Ton (180,000 BTU) 15 Hp 15 74 49 21 30 375 250 108
20 Ton (240,000 BTU) 10 Hp (x2) 20 98 65 28 20 250 167 72
20 Ton (240,000 BTU) 20 Hp 20 n/a 65 28 40 500 333 144
25 Ton (300,000 BTU) 25 25 n/a 82 35 50 625 416 180
30 Ton (360,000 BTU) 15 Hp (x2) 30 n/a 98 42 30 375 250 108
30 Ton (360,000 BTU) 30 Hp 30 n/a 98 42 60 750 500 217
40 Ton (480,000 BTU) 20 Hp (x2) 40 n/a 131 57 40 500 333 144
40 Ton (480,000 BTU) 40 Hp 40 n/a 131 57 80 1000 666 289
50 Ton (480,000 BTU) 25 Hp (x2) 50 n/a 163 71 50 625 416 180
50 Ton (480,000 BTU) 50 Hp 50 n/a 163 71 100 1250 833 361
General Residential
Running Load Starting Load
Running Amps at Amps at Starting LR Amps LR Amps
Description Hp kW 120V 1ø 240V 1ø kW 120V 1ø 240V 1ø
Refrigerator, Sump Pump, 0.5 0.5 4.9 2.5 1.5 25 13
Furnace, Garage Opener
Freezer, Washer, Septic Grinder 0.75 0.75 7.4 3.7 2.3 38 19
General 1 Hp 1 1 9.8 4.9 3 50 25
Well and Septic Lift Pump 2 2 19.6 9.8 6 100 50
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