2 battery selection calculations – Harrington Signal HS-3200 - Install Manual User Manual
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HS-3100/3200 Installation Manual
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5.2 Battery Selection Calculations
1.
From previous calculations, locate total Standby Current (A) and convert to amperes. A =
________
(Note: amperes = mA ÷ 1000; µA ÷ 1,000,000; examples: 250 mA = 0.25 A; 1500 µA =
0.0015 A)
2.
Identify Standby Time (C), in hours. C = ______ (typically 4, 24, 48, or 60 hr)
3.
From previous calculations, locate total Alarm Current (B) in amperes. B = ______
4.
Identify Alarm Time (D) in minutes. D = ______ (typically 5, 10, or 15 min)
5.
Using the values in Steps 1-4, perform an Initial Battery Calculation per the following:
(A x C) + (0.0167 x B x D) = _______ Ah (Ah = ampere hours)
6.
Select a battery size LARGER than the number from the Initial Battery Calculation from
the following list of SOTA batteries using the 20 Hour Rating value:
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 must be applied per the following table (use the 20 hr
value for 24 hr standby):
Standby Discharge Factor (SDF) = _________ Alarm Discharge Factor (ADF) = _________
7.
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)] = _______
8.
If the battery size initially selected is smaller than the result of step 9 above, repeat the
calculations using a larger battery size.
Part Number
20
Hour
Rating
C/20
(Amps)
Part Number
20
Hour
Rating
C/20
(Amps)
HS-12V4.5AH
4.5 Ah
0.225
HS-12V18AH
18 Ah
0.9
HS-12V7.2AH
7.2 Ah
0.36
HS-12V26AH
26 Ah
1.3
HS-12V12AH
12 Ah
0. 6
HS-12V35AH
35 Ah
1.75
Discharge Time
Discharge
Factor
Discharge
Time
Discharge
Factor
Discharge
Time
Discharge
Factor
Discharge
Time
Discharge
Factor
0.083 hr
5 min
3.85
2 hr
1.43
8 hr
1.10
14 hr
1.03
0.166 hr
10 min
2.78
3 hr
1.30
9 hr
1.09
16 hr
1.02
0.249 hr
15 min
2.27
4 hr
1.22
10 hr
1.08
18 hr
1.01
0.332 hr
20 min
2.08
5 hr
1.18
11 hr
1.06
20 hr
1.00
0.5 hr
30 min
1.96
6 hr
1.14
12 hr
1.05
48 hr
1.00
1 hr
60 min
1.67
7 hr
1.11
13 hr
1.04
60 hr
1.00