Samlex Solar SCC-30AB Owner's Manual page 14

3
GENERAL INFORMATION: BATTERIEs
PERCENTAGE OF
FULL CHARGE
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Check the individual cell Voltages. If the inter cell Voltage difference is more than a
0.2V, the battery will have to be equalized. Please note that only the non-sealed /
vented / flooded / wet cell batteries are equalized. Do not equalize sealed / VRLA type
of AGM or Gel Cell Batteries (unless allowed by the manufacturer).
Battery Efficiency
A lead-acid battery has an efficiency of only 75% - 85%. The energy lost appears as
heat and warms the battery. This means that the Ampere Hour (Ah) energy required
to charge a battery to its full rated capacity will be approximately 120% to 130%
higher than the Ah capacity rating of the battery.
Depth of Discharge and Battery Life
The more deeply a battery is discharged on each cycle, the shorter the battery life.
Using more batteries than the minimum required will result in longer life for the
battery bank. A typical life cycle chart is given in the Table below:
DEPTH OF DISCHARGE
% OF Ah CAPACITy
10
50
80
100
It is recommended that the depth of discharge should be limited to 50%.
14
STANDING VOLTAGE OF
12V NOMINAL BATTERy
Table 3.3. State of Charge versus Standing Voltage – 12V Battery
CyCLE LIFE OF
GROUP 27 / 31
T
able 3.4. Typical Cycle Life Chart
12.63V
12.6V
12.5V
12.3V
12.2V
12.1V
12.0V
11.8V
11.7V
11.6V
= / < 11.6V
CyCLE LIFE OF
1000
320
200
150
Cell Voltage (12V BATTERy
HAS 6 CELLS IN SERIES)
2.105V
2.10V
2.08V
2.05V
2.03V
2.02V
2.00V
1.97V
1.95V
1.93V
= / < 1.93V
GROUP 8D
1500
480
300
225
CyCLE LIFE OF
GROUP GC2
3800
1100
675
550