Appendix
©
2015 Sensata Technologies
37
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 A-2),
four 12 VDC/100 AHr batteries are combined into a single 12 VDC/400 AHr
battery bank.
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 A-3),
four 6 VDC/200 AHr batteries are combined into two strings resulting in a 12
VDC/400 AHr battery bank.
Figure A-2, Parallel Battery Wiring
Figure A-3, Series-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
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)