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7.7 CHARGING / DISCHARGING CURVES
Fig. 7.1 shows the charging and discharging characteristics of a typical 12V / 24V / 48 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.
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
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
66.0
64.0
62.0
60.0
58.0
56.0
54.0
52.0
50.0
48.0
46.0
44.0
42.0
40.0
38.0
36.0
24V
48V
Fig. 7.1: Charging / Discharging Curves for 24V / 48V Lead Acid Batteries
7.8 REDUCTION IN USABLE CAPACITY AT HIGHER DISCHARGE RATES – TYPICAL IN
INVERTER APPLICATION
As stated above, the rated capacity of the battery in Ah 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 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 on Lead Acid Batteries
Содержание PSR-1200-24
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