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Appendix B - Batteries
Estimating Battery Requirements (continued)
NOTE: Motors typically require 3–6
times their running current
when starting. Check the
manufacturer's data sheets
for their starting current
requirements. If large
motors will be started from
the inverter, increase the
battery bank size to allow
for the higher start-up
current.
*NOTE: Refrigerators and ice-
makers typically run only
about 1/3 of the time,
therefore, the running
wattage is 1/3 of the total
wattage of the appliance.
Divide the total wattage of
the appliance by 3 and enter
it in Step 2.
B-4
Multiply the amperage by the number of hours the load will operate to roughly
calculate amp hours. Double this figure to reach the 50% battery capacity level.
Refer to the example and worksheet on the following pages as a guide to
determine the battery bank's amp-hour requirements.
Complete the following steps to calculate the battery-bank capacity
requirements. Use the blank table on page B-6 to enter the values for your
system. A sample table is shown below.
t S
p e
1
A
C
A
p
i l p
n a
e c
A
p
i l p
n a
e c
R
u
n
n
n i
g
W
t a
M
c i
o r
w
a
e v
6
0 0
i L
h g
s t
x (
) 4
0 4
H
r i a
D
y r
r e
7
0 5
T
l e
v e
i s i
n o
1
0 0
W
a
h s
r e
3
5 7
R
e
i r f
e g
a r
o t
* r
4
0 8
3 /
=
1
0 6
V
c a
u u
m
C
e l
n a
r e
1
2 ,
0 0
5
1 ,
9 3
5 1
4 ,
7 1
t S
p e
6
t S
p e
7
o T
l a t
D
a
y l i
W
a
t t
A
u
o t
n
o
m
y
H
o
u
s r
R
q e
u
r i
d e
B
t a
e t
y r
i S
e z
5
1 ,
9 3
5 1
4 ,
7 1
Sample - Estimating Battery Requirements
t S
p e
2
t S
p e
(
) x
H
o
u
s r
u
s
d e
(
) x
D
a
s y
s t
a e
h c
d
y a
a e
h c
w
0
5 .
7
6
7
. 0
5 2
3
4
7
1
2
4 2
7
1
1
0 3
8 ,
4 3
7 3
0 ,
t S
p e
8
t S
p e
R
o
u
g
h
B
t a
e t
y r
S
a
e f
B
t a
i S
e z
i S
e z
(
W
(
W
a
t t
H
o
r u
) s
H
o
r u
0 3
8 ,
4 3
7 3
0 ,
Table B-1
©2002 Xantrex Technology Inc. All Rights Reserved.
3
t S
p e
4
÷ (
7
) =
A
v
r e
g a
e
u
s
d e
D
a
y l i
W
a
t t
H -
o
r u
e
k e
R
q e
i u
e r
m
e
t n
3
0 0
2
0 4
1 8
4
0 0
1
7 0
3
8 ,
0 4
1
1 7
1 0
1
5 ,
2 4
9
t S
p e
0 1
e t
y r
S
a
e f
B
t a
e t
y r
a
t t
i S
e z
A (
m
p
) s
H
o
r u
) s
1 0
1
5 ,
2 4
P/N 975-0026-01-01 Rev A 06/2002
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