Base
Model

Storage
Capacity
(Gallons)

KW Selection & Electrical Supply

120 V
1 Phase

208 - 480 V
1 Phase

208 - 480 V
3 Phase

ER10

10

1.5

2, 3

3, 4, 5, 6,
8, 10

ER20

20

ER30

30

1.5

2,  3.5,  4.5
5.5,  6

ER40

40

ER50

50

ER65

65

1.5

2,  3.5,  4.5
5.5,  6,  8,  10,
12,  15

6,  8,  10,  12
15,  20,  30,
35,  40,  45
54,  58

ER80

80

ER100

100

ER120

120