© 2010 Magnum Energy, Inc.
Appendix B - Battery Information
42
Figure 20, Series-Parallel Battery Wiring
overcurrent
protection
String 2
String 1
12 volt battery bank (total capacity = 400 AHrs)
To
12 VDC
Inverter
6 volts
(200 AHrs)
6 volts
(200 AHrs)
6 volts
(200 AHrs)
6 volts
(200 AHrs)
Series-Parallel Wiring
A series-parallel con
fi
guration increases both voltage (to match the
inverter’s DC requirements) and capacity (to increase run time for
operating the loads) using smaller, lower-voltage batteries. In the
example below (Figure 20), four 6 VDC/200 AHr batteries are com-
bined into two strings resulting in a 12 VDC/400 AHr battery bank.
Figure 19, Parallel Battery Wiring
12 volt battery bank (total capacity = 400 AHrs)
overcurrent
protection
12 volts
(100 AHrs)
12 volts
(100 AHrs)
12 volts
(100 AHrs)
12 volts
(100 AHrs)
To
12 VDC
Inverter
Parallel Wiring
Wiring the batteries in parallel increases the total run time the bat-
teries can operate the AC loads. A parallel connection combines
overall battery capacity by the number of batteries in the string. Even
though there are multiple batteries, the voltage remains the same.
In the example below (Figure 19), four 12 VDC/100 AHr batteries
are combined into a single 12 VDC/400 AHr battery bank.
