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5 h rating
20 h rating,
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 h 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 h rating,
log
Peukert
exponent,
n
log
A Peukert calculator is available at www.victronenergy.com.
4.1.3
Synchronising the VBC-HV
For a reliable readout of the state of charge of your battery, the battery
monitor has to be synchronised regularly with the battery and charger.
C
75
Ah
5
hr
t
5
h
1
75
Ah
I
15
A
1
5
h
C
100
Ah
(rated
capacity)
2 0
h r
t
20
h
2
100
Ah
I
5
A
2
20
h
8
5 .
h
20
A
C
200
Ah
20
h
t
20
h
2
200
Ah
I
10
A
2
20
h
20
log
8
5 .
1.23
20
log
10
log
Peukert
exponent,
n
log
20
log
5
1.26
15
log
5
9
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