Calculating the battery power requirements
It is important that adequate stand-by power is available to supply all devices in the event of a mains supply failure. To ensure that enough power is available, always connect the appropriate back-up battery and PSU.
The following tables give an approximation of the maximum load current that can be drawn from each type of battery over the given stand-by periods.
The approximations below assume that the SPC controller PCB is drawing its maximum load (all wired inputs have their EOL resistors fitted) and that the usable output power from the battery is 85% of its maximum capacity.
|
0.85 x battery size (Ah) |
– |
(Icont + Ibell) |
= |
Imax |
|
Time (hours) |
Battery size = capacity, in Ah, depending upon SPC housing chosen
Time = backup time, in hours, depending upon security grade
Icont = quiescent current (in A) for the SPC controller
Ibell = quiescent current (in A) for the attached external and internal bells
Imax = the maximum current that can be drawn from the auxiliary power output
Amount of current from Aux output using a 7Ah battery (SPC422x/522x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
356 |
331 |
226 |
201 |
|
30 h |
58 |
33 |
N/A |
N/A |
Amount of current from Aux output using a 17Ah battery (SPC523x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
750 |
750 |
750 |
750 |
|
30 h |
342 |
317 |
212 |
187 |
Amount of current from Aux output using a 7Ah battery (SPC432x/532x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
326 |
301 |
196 |
171 |
|
30 h |
28 |
N/A |
N/A |
N/A |
Amount of current from Aux output using a 17Ah battery (SPC533x/633x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
750 |
750 |
750 |
750 |
|
30 h |
312 |
287 |
182 |
157 |
Amount of current from Aux output using a 24Ah battery (SPC535x/635x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
1650 |
1625 |
1610 |
1585 |
|
24 h |
650 |
625 |
610 |
585 |
|
30 h |
450 |
425 |
410 |
385 |
|
60 h |
50 |
25 |
10 |
N/A |
Amount of current from Aux output using two 24Ah batteries (SPC535x/635x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
2205 |
2180 |
2165 |
2140 |
|
24 h |
1650 |
1625 |
1610 |
1585 |
|
30 h |
1250 |
1225 |
1210 |
1185 |
|
60 h |
450 |
425 |
410 |
385 |
Amount of current from Aux output using a 27Ah battery (SPC535x/635x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
1900 |
1875 |
1860 |
1835 |
|
24 h |
775 |
750 |
735 |
710 |
|
30 h |
550 |
525 |
510 |
485 |
|
60 h |
100 |
75 |
60 |
35 |
Amount of current from Aux output using two 27Ah batteries (SPC535x/635x)
|
COMMS |
NONE (mA) |
PSTN (mA) |
GSM (mA) |
PSTN+GSM (mA) |
|---|---|---|---|---|
|
Standby time |
||||
|
12 h |
2205 |
2180 |
2165 |
2140 |
|
24 h |
1900 |
1875 |
1860 |
1835 |
|
30 h |
1450 |
1425 |
1410 |
1385 |
|
60 h |
550 |
525 |
510 |
485 |
Values listed as N/A indicate that the selected battery does not have the capacity to power the minimum load of just the SPC controller for the given standby time. See Calculating the battery power requirements for maximum load of devices and modules.
|
Only sealed cell valve regulated battery types to be used. For EN compliance the supplied current needs to be supported by the battery for required stand by time. |