Motor Load Reference; Ac And Heat Pumps; General Residential - Siemens Standby Generators Manual

Generator Sizing Guide
Table 1 – Motor Load Reference

AC and Heat Pumps

Description Hp
1 Ton (12,000 BTU) 1
2 Ton (24,000 BTU) 2
3 Ton (36,000 BTU) 3
4 Ton (48,000 BTU) 4
5 Ton (60,000 BTU) 5
7.5 Ton (85,000 BTU) 7.5
10 Ton (120,000 BTU) 5 Hp (x2)
10 Ton (120,000 BTU) 10 Hp
15 Ton (180,000 BTU) 7.5 Hp (x2)
15 Ton (180,000 BTU) 15 Hp
20 Ton (240,000 BTU) 10 Hp (x2)
20 Ton (240,000 BTU) 20 Hp
25 Ton (300,000 BTU) 25
30 Ton (360,000 BTU) 15 Hp (x2)
30 Ton (360,000 BTU) 30 Hp
40 Ton (480,000 BTU) 20 Hp (x2)
40 Ton (480,000 BTU) 40 Hp
50 Ton (480,000 BTU) 25 Hp (x2)
50 Ton (480,000 BTU) 50 Hp

General Residential

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