40
Peukert's Equation
PERCENTAGE OF AVAILABLE CAPACITY FROM A
100 Ahr BATTERY AT DIFFERENT DISCHARGE RATES
USING DIFFERENT PEUKERT'S EXPONENTS
DISCHAGE RATE IN AMPS
n
5
10 16.7
25
50
75 100 150 200 250 300 400 500
1
100 100 100 100 100 100 100 100 100 100 100 100 100
1.1
100
93
88
85
79
76
74
71
69
67
66
64 63
1.2
100
87
78
72
63
58
55
51
48
46
44
42 40
1.25 100
84
74
67
56
51
47
42
40
37
36
33 32
1.3
100
81
69
62
50
44
41
36
33
31
30
27 25
1.4
100
76
61
52
40
34
30
26
23
21
20
17 16
1.5
100
71
55
45
32
26
22
18
16
14
13
11 10
Example #1: Suppose you have a 200
Ahr battery. Now discharge at a 50
Amp rate until the battery reaches
1.75V per cell (10.5V for a 12V bat-
tery). This would be equalivent to a
discharge rate of 25A for a 100 Ahr
battery. If the battery delivered 67%
(134Ahr) the appropriate Peukert's
exponent would be 1.25.
Example #2: A 100 Ahr bat-
tery with a Peukert's exponent
of 1.3 will deliver only 41% of
its capacity when supplying a
100A load.
EXPONENT
The table below may be used to understand the effect of high rates of
discharge on available battery capacity. It may also be used to estimate
the exponent "n" for a battery after a single discharge test. The table is
based on a 100 Ahr battery but may be used for any capacity battery by
using an appropriately scaled current. See the examples below:
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