SamplexPower Pure Sine Wave PST-600-12 Manuel Du Propriétaire page 20

SECTION 7 |
TABLE 7.2: DISCHARGE CURRENT RATES - "C-RATES" (continued from Previous page)
Hours of discharge time "T" till
the "End Point Voltage"
8 Hrs. (UPS application)
10 Hrs. (Telecom application)
20 Hrs. (Automotive application)
100 Hrs.
NOTE:
When a battery is discharged over a shorter time, its specifi ed "C-Rate" discharge current will
be 4 times higher than the "C-Rate" discharge current at 20 Hour discharge period i.e. C/20 Amps.
7.7 CHARGING / DISCHARGING CURVES
Please note that X-axis shows % State of Charge. State of Discharge will be = 100% - %
State of Charge
24V 12V
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
Fig. 7.1: Charging / Discharging Curves for 12V Lead Acid Battery
20 | SAMLEX AMERICA INC.
General Information on Lead Acid
Batteries
"C-Rate" Discharge Current in Amps =
Capacity "C" in Ah
Lead-Acid Battery Chart - 80˚F / 26.7˚C
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
0 10 20 30 40
Battery State of Charge in Percent (%)
÷
Discharge Time
"T" in Hrs.
C/10 or 0.1C
C/100 or 0.01C
CHARGE
C/100
C/20
C/10
C/5
C/3
50 60 70 80 90 100
Example of C-Rate
Discharge Currents
for 100 Ah battery
10A
1A
C/5
C/10
C/20
C/40
DISCHARGE
110 120 130