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implemented to bypass Peukert compensation. The default setting for the
Peukert exponent is 1.25, and is an acceptable average value for most lead
acid type of batteries. However for precise battery monitoring, entering the
right Peukert exponent is essential. If the Peukert exponent is not provided
with your battery, you can calculate it by using other specifications which
should be provided with your battery.
The Peukert equation is stated below:
n
where the Peukert exponent, n =
Cp
=
I
⋅
t
The battery specifications needed for calculation of the Peukert exponent,
are the rated battery capacity (usually the 20hr discharge rate
example a 5hr discharge rate
the Peukert exponent using these two specifications.
5hr rating
20hr rating,
Peukert
exponent,
1
Please note that the rated battery capacity can also be defined as the 10hr or even 5hr discharge rate.
2
The 5hr discharge rate in this example is just arbitrary. Make sure that besides the C20 rating (low
discharge current) you choose a second rating with a substantially higher discharge current.
6
2
. See below for an example of how to define
C
=
75
Ah
5
hr
t
=
5
hr
1
75
Ah
I
=
=
15
1
5
hr
C
=
100
Ah
(rated
20
hr
t
=
20
hr
2
100
Ah
I
=
=
5
2
20
hr
log
20
−
log
5
=
n
log
15
−
log
5
log
t
2
log
I
1
A
capacity)
A
=
1 . 2 6
1 . 2 6
1 . 2 6
1 . 2 6
−
log
t
1
−
log
I
2
1
) and for
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