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Les langues disponibles
5 hr rating
20 hr rating,
log
Peukert
exponent,
n
=
log
When no ratings are given at all, you can measure your battery using a
constant load bank. In this way a second rating can be obtained, together
with the 20 hr rating which represents the rated battery capacity in most
cases. This second rating can be determined by discharging a fully
charged battery with a constant current; until the battery reaches 1.75 V
per cell (which is 10.5 V for a 12 V battery or 21 V for a 24 V battery). A
calculation example is shown below:
A 200 Ah battery is discharged with a constant current of 20 A and after
8.5 hours 1.75 V/cell is reached.
t
=
So,
1
I
=
1
20 hr rating,
log
Peukert
exponent,
n
=
log
A Peukert calculator is available at www.victronenergy.com.
10
C
=
75
Ah
5
hr
=
5
t
hr
1
75
Ah
I
=
=
15
A
1
5
hr
C
=
100
Ah
(rated
capacity)
20
hr
t
=
20
hr
2
100
Ah
I
=
=
5
A
2
20
hr
20
−
log
5
=
1.26
15
−
log
5
8
5 .
hr
20
A
C
=
200
Ah
20
hr
t
=
20
hr
2
200
Ah
I
=
=
10
A
2
20
hr
20
−
log
8
5 .
=
1.23
20
−
log
10
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