Redback® Proudly Made In Australia
4
Calculating battery size for PA systems
Total amplifier power in watts
Battery Size =
x 1.5 =
Volts
500
=
x 1.5 = 31.25AH
24
Required
amps for
1 hour
Therefore a 40AH battery would be suitable Please note: This calculation
assumes 100% duty cycle at full power output into full rated load.
500W amplifier
Battery Size
Connecting batteries in series
+
12V Battery
+
12V Battery
To C
To Charger -
2 x 12V batteries = 24V total battery voltage.
+
6V Battery
+
6V Battery
To C
To Charger -
4 x 6V batteries = 24V total battery voltage.
+
+
6V Battery
6V Battery
It is common practice to connect 6V or 12V batteries in series to
create a 24V battery source.
Equalising batteries
Connect in parallel overnight (10-12 hours
minimum) prior to connecting them to the
charger. Failure to do this can cause a severe
inbalance in the charging of the batteries causing
permanent damage.
+
12V Battery
12V batteries connected
in parallell.
+
12V Battery
6V batteries connected
in parallell.
+
6V Battery
+
6V Battery
+
6V Battery
+
6V Battery
5.0 Battery Characteristics
Before connecting batteries to the charger it is recommended that the batteries be equalised as shown in Fig 4.
Batteries should also be connected in series to create a 24V battery source as shown in Fig 5.
** PLEASE NOTE: The A 4506 and A 4512 are 24V battery charging systems. **
Fig 3
Fig 5
4.0 Calculating Battery Size
Before wiring any batteries to the charger it is important to calculate the battery size required for the PA system you are
installing. Figure 3 demonstrates the formula to calculate the required battery size.
Fig 4