Battery Calculation Worksheet Example; Absolute Maximum Loads - GE Alliance AL-2017 Installation Manual

Battery calculation worksheet example

225
1. __________mA X .001Amp/mA X _____________ hours: ________________ Ah standby Amp-hours
Total standby
Conversion
current
factor
1000
2. __________mA X .001Amp/mA X ____________ minutes X .0167 hours/min _____________ Ah alarm Amp-hours
Conversion
Total alarm
factor
current
80
3. __________mA X .001Amp/mA X ____________ seconds X .000278 hours/sec ___________ Ah active Amp-hours
Conversion
Total active
factor
current
4. Standby Amp-hours + Alarm Amp-hours + Active Amp-hours = Minimum battery power required
16.2
______________ + ______________ + ______________ = _______________Ah
5. Minimum battery power required X Battery capacity derating coefficient = Total standby battery required
16.74
__________________________ X _____________________________ = _____________________Ah

Absolute maximum loads

The following tables list the maximum continuous loads that can be supported by two 17.2 Ah batteries or one 17.2 Ah battery. If the total
standby current exceeds those listed in the tables, you do not meet 24/72-hour standby requirements. Other battery sizes are possible, but
two 17.2 Ah batteries are the maximum battery size supported. If your standby time is different, the battery calculation worksheet can be
used to calculate the total standby battery power required. If the answer exceeds the battery size you have chosen, then appropriate
batteries must be installed or the system configuration must be adjusted to meet the battery power requirements.
Required batteries Maximum continuous load for 24/72-hour standby with 15-minute alarm and 1 active card read/5 minutes
Maximum total
Two 17.2 Ah 750mA
Maximum Total
One 17.2 Ah 500mA
18
72
Required number of
hours in standby
15
Required number of
minutes in alarm
12960
Required number of
seconds active
Note: Based on 1 card activation of 15 seconds every 5 minutes for 72 hours.
.2505 .288
1.15
24-hour
Maximum auxiliary plus system bus power
500mA
Maximum auxiliary plus system bus power
300mA
16.2
.2505
Conversion
factor
.288
Conversion
factor
16.74
19.2
Maximum total
325mA
_
AL-2017/AL-3017 Installation Manual
72-hour
Maximum auxiliary
100mA
_