Simplex 4006-9121 Technical Manual page 74

7. If either the Standby Current or the Alarm Current is greater than the C/20 current for the initial battery size selected, a
Discharge Factor (DF) must be applied. For example, 1A load on a 10 Ah battery requires a Discharge Factor of 1.08 (10
Ah / 1 A gives discharge time of 10 hours; DF = 1.08). Use the following table to determine Discharge Factor (use the 20
hr value for 24 hr standby):
Discharge
Time
0.083 hr
0.166 hr
0.249 hr
0.332 hr
0.5 hr
1 hr
8. Standby Discharge Factor (SDF) = _________
9. Minimum Required Battery Capacity Calculation (to account for battery aging, a 1.17 multiplier is included)
Minimum battery capacity in Ah =
1.17 x [(A x C x SDF) + (0.0167 x B x D x ADF)] = _______
10. If the battery size initially selected is smaller than the result of step 9 above, repeat the calculations using a larger battery
size.
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20 Hour Rating
2.2 Ah
3.0 Ah
3.4 Ah
4.0 Ah
4.5 Ah
5.0 Ah
6.2 Ah
Discharge Discharge
Factor
5 min 3.85 2 hr
10 min 2.78 3 hr
15 min 2.27 4 hr
20 min 2.08 5 hr
30 min 1.96 6 hr
60 min 1.67 7 hr
C/20 (Amps) 20 Hour Rating
0.11 7.0 Ah
0.15 7.2 Ah
0.17 10 Ah
0.20 12 Ah
0.225 12.7 Ah
0.25 18 Ah
0.31 25 Ah
Discharge Discharge
Time Factor Time
1.43 8 hr
1.30 9 hr
1.22 10 hr
1.18 11 hr
1.14 12 hr
1.11 13 hr
Alarm Discharge Factor (ADF) = _________
A-2
C/20 (Amps)
0.35
0.36
0.50
0.60
0.635
0.90
1.25
Discharge Discharge
Factor Time
1.10 14 hr 1.03
1.09 16 hr 1.02
1.08 18 hr 1.01
1.06 20 hr 1.00
1.05 48 hr 1.00
1.04 60 hr 1.00
Discharge
Factor