© 2015 Sensata Technologies
Appendix B – Battery Information
48
Figure B-3, Series-Parallel Battery Wiring
overcurrent
protection
String 2
String 1
12-volt battery bank (total capacity = 400 AH)
To
12 VDC
Inverter
6 volts
(200 AH)
6 volts
(200 AH)
6 volts
(200 AH)
6 volts
(200 AH)
Series-Parallel Wiring
A series-parallel con
fi
guration increases both voltage (to match
inverter’s DC requirements) and capacity (to increase run time for
operating loads) using smaller, lower-voltage batteries. In example
below (Figure B-3), four 6 VDC/200 AH batteries are combined into
two strings resulting in a 12 VDC/400 AH battery bank.
Figure B-2, Parallel Battery Wiring
12-volt battery bank (total capacity = 400 AH)
overcurrent
protection
12 volts
(100 AH)
12 volts
(100 AH)
12 volts
(100 AH)
12 volts
(100 AH)
To
12 VDC
Inverter
Parallel Wiring
Wiring the batteries in parallel increases the total run time the
batteries 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 B-2), four 12 VDC/100 AH
batteries are combined into a single 12 VDC/400 AH battery bank.