24 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 25
Typical 12V/24V Flooded Lead-Acid Battery Chart - 80˚F / 26.7˚C
Battery Voltage in VDC
Battery State of Charge in Percent (%)
0 10 20 30 40 50 60 70 80 90 100 110 120 130
16.5
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.0
9.5
9.0
C/5
C/40
C/20
C/10
DISCHARGE
CHARGE
C/20
C/3
C/5
C/10
C/100
33.0
32.0
31.0
30.0
29.0
28.0
27.0
26.0
25.0
24.0
23.0
22.0
21.0
20.0
19.0
18.0
24V 12V
Fig 7.1 Charging / Discharging Curves for Typical 12V/24V Flooded Lead Acid Battery
7.8 REDUCTION IN USABLE CAPACITY AT HIGHER DISCHARGE RATES –
TYPICAL IN INVERTER APPLICATION
As stated earlier, the Ah capacity of automotive battery is normally applicable at C-rate
of C/20 (or, 0.05C). As the discharge rate is increased as in cases where the inverters are
driving higher capacity loads, the usable Ah capacity reduces due to “Peukert Effect”.
This relationship is not linear but is more or less according to the Table 7.3.
SECTION 7 | General Information - Battery Related
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