3
Technical Data TD00405018E
Effective August 2009
Generator Sizing Guide
EATON CORPORATION www.eaton.com
Table 1. Motor Load Reference
AC & Heat Pumps Running Load Starting Load
Description Hp
Running
kW
Amps @
240V 1Ø
Amps @
208V 3Ø
Amps @
240V 3Ø
Amps @
480V 3Ø
LR Amps @
240V 1Ø
LR Amps @
208V 3Ø
LR Amps @
240V 3Ø
LR Amps @
480V 3Ø kW
1 Ton
(12,000 BTU)
1 1 5 3 3 1 33 22 19 10 2.5
2 Ton
(24,000 BTU)
2 2 10 7 6 3 67 44 38 19 5
3 Ton
(36,000 BTU)
3 3 15 10 8 4 100 67 58 29 7.5
4 Ton
(48,000 BTU)
4 4 20 13 11 6 117 78 67 34 10
5 Ton
(60,000 BTU)
5 5 25 16 14 7 145 97 84 42 12.5
7.5 Ton
(85,000 BTU)
7.5 7.5 37 24 21 11 219 146 126 63 17
10 Ton*
(120,000 BTU)
5 (x2) 10 49 33 28 14 145 97 84 42 12.5
10 Ton
(120,000 BTU)
10 10 49 33 28 14 250 167 144 72 20
15 Ton*
(180,000 BTU)
7.5 (x2) 15 74 49 42 21 219 146 126 63 17
15 Ton
(180,000 BTU)
15 15 74 49 42 21 375 250 217 108 30
20 Ton*
(240,000 BTU)
10 (x2) 20 98 65 57 28 250 167 144 72 20
20 Ton
(240,000 BTU)
20 20 N/A 65 57 28 500 333 289 144 40
25 Ton
(300,000 BTU)
25 25 N/A 82 71 35 625 416 361 180 50
30 Ton*
(360,000 BTU)
15 (x2) 30 N/A 98 85 42 375 250 217 108 30
30 Ton
(360,000 BTU)
30 30 N/A 98 85 42 750 500 433 217 60
40 Ton*
(480,000 BTU)
20 (x2) 40 N/A 131 113 57 500 333 289 144 40
40 Ton
(480,000 BTU)
40 40 N/A 131 113 57 1000 666 577 289 80
50* Ton
(480,000 BTU)
25 (x2) 50 N/A 163 142 71 625 416 361 180 50
50 Ton
(480,000 BTU)
50 50 N/A 163 142 71 1250 833 722 361 100
General Residential
Description Hp
Running
kW
Amps @
120V 1Ø
4.9 Amps @
240V 1Ø
LR Amps @
240V 1Ø
LR Amps @
120V 1Ø kW
Refrigerator
pump, sump,
furnace, garage
opener
0.5 0.5 4.9 2.5 13 25 1.5
Freezer,
washer, septic
grinder
0.75 0.75 7.4 3.7 19 38 2.3
General 1 Hp 1 1 9.8 4.9 25 50 3
Well & septic
lift pump
2 2 19.6 9.8 50 100 6
* For multiple motor configurations, sequence starting is assumed.
Caution:
Do not size the generator based on starting kW alone.
You must compare LR Amps to generator surge capability (table #3).
Size the generator by following the sizing instructions.
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