alphatronics AlphaVision ML - POWER CONSUMPTION AND BATTERY CALCULATIONS; Power Specifications and Battery Sizing

Installer manual AlphaVision ML Rev. 3.60 01-01-2015 30
POWER CONSUMPTION AND BATTERY CALCULATIONS
Power consumption
For larger AlphaVision ML installations it is extremely important to calculate the total power consumption to
ensure that the security system continues working during a mains failure. Furthermore it is important to
know if the capacity of the batteries is sufficient to keep the security system running for the prescribed
number of hours during a mains failure.
According to the latest international standards, a control panel should remain operational for at least 18
hours on the backup battery and then after 18 hours it should be able to give an alarm for 30 minutes. The
Dutch requirements are less strict and the installation must remain operational for at least 12 hours on its
backup batteries if transmitting to a central station. Check local requirements for the correct stand-by time !
The maximum power consumption of each AlphaVision ML component is as follows:
Current
consumption:
with backlight:
Peak
consumption:
AlphaVision ML control panel
133mA
AlphaVision ML LCD keypad
15mA
90mA
AlphaVision ML LCD/PROX keypad
65mA
140mA
150mA
AlphaVision ML Prox Reader
56mA
AlphaVision ML Input + 8 OC module
58mA
AlphaVision ML I/O module
74mA
*
AlphaVision ML wireless expansion
15mA
Connect 101 ISDN adapter in cabinet
145mA
AlphaVision ML PSTN plug-on dialer
10mA
AlphaVision ML GSM/GPRS module
30mA
300-500mA
*
These products are equipped with their own power supply including a backup facility and do not consume
power from the RS-485 bus.
Control panel
The Alpha Vision ML power supply can deliver 1.9A or 3A @ 12VDC. This maximum includes the own power
consumption of the main board (133mA) and the battery charge current consumption. The battery is
charged through a fixed stabilized voltage. The charging current has a maximum value of approximately
120mA (for 7Ah lead acid batteries).
To calculate the minimum required battery capacity (Ah), the following formula can be used:
International standard: C
20
= 18 * I1 + 0,5 * I2
Dutch standard: C
20
= 12 * I1
C
20
= Capacity of the battery at 20°C and a drain time of 20 hours
I1 = Current consumption of the control panel in idle state
I2 = Current consumption of the control panel in alarm