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1.4.6 Charging / Discharging Curves
fig. 1.4 shows the charging and discharging characteristics of a typical 12V / 24V flooded
Lead Acid battery at electrolyte temperature of 80°f / 26.7°C. The curves show the % State
of Charge (X-axis) versus terminal voltage (Y-axis) during charging and discharging at different
C-rates.
Please note that X-axis shows % State of Charge. State of Discharge will be =
100% - % State of Charge . These curves will be referred to in the subsequent explanations.
Typical Flooded Lead-Acid Battery Chart - 80˚F / 26.7˚C
Battery V
oltage 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 1.4 Charging / Discharging Curves for typical Flooded Lead Acid battery
1.4.7
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 a discharge rate
of 20 Hours. 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 1.9.
SECTIOn 1 | Safety Instructions & general Information