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Appendix B – Battery Information
Figure B-3, Series-Parallel Battery Wiring
Figure B-1, Series Battery Wiring
Figure B-2, Parallel Battery Wiring
B-6 Battery Wiring
The battery bank must be wired to match the inverter’s DC input voltage. In addition, the batteries
can be wired to provide additional run time. The various wiring con fi gurations are:
Series Wiring
Wiring batteries in series increases the battery bank’s output voltage. A series connection combines
each battery in a string until the total voltage matches the inverter’s DC requirement. Even though
there are multiple batteries, the capacity remains the same. In Figure B-1 below, two 6 VDC, 200
AH batteries are combined into a single string resulting in a 12 VDC, 200 AH bank.
Series-Parallel Wiring
A series/parallel con fi guration increases both voltage (to match the inverter’s DC requirements)
and amp-hour capacity (to increase run-time for operating the loads) using smaller, lower-voltage
batteries. In Figure B-3 below, four 6 VDC, 200 AH batteries are combined into two strings resulting
in a 12 VDC, 400 AH battery bank.
Series/Parallel Battery Wiring
combines battery voltage and capacity:
= 400 AH @ 12 VDC
add voltage
in series
6 VDC
(200 AH)
6 VDC
(200 AH)
6 VDC
(200 AH)
6 VDC
(200 AH)
12 VDC @
400 AH
200 AH @ 12 VDC
+ 200 AH @ 12 VDC
= 400 AH @ 12 VDC
add capacity
in parallel
voltage and
capacity together
200 AH @ 6 VDC
+ 200 AH @ 6 VDC
= 200 AH @ 12 VDC
200 AH @ 6 VDC
+ 200 AH @ 6 VDC
= 200 AH @ 12 VDC
+ =
Parallel Wiring
Wiring batteries in parallel increases the battery bank’s amp-hour capacity, which allows the AC
loads to operate for a longer time. A parallel connection combines the number of batteries in the
string to increase overall battery capacity; however, the voltage remains the same. In Figure B-2
below, two 12 VDC, 100 AH batteries are combined into a single 12 VDC, 200 AH battery bank.
12 VDC
(100 AH)
12 VDC @
200 AH
100 AH @ 12 VDC
+ 100 AH @ 12 VDC
= 200 AH @ 12 VDC
12 VDC
(100 AH)
Parallel Battery Wiring
combines battery capacity:
6 VDC
(200 AH)
6 VDC
(200 AH)
12 VDC @
200 AH
Series Battery Wiring
combines battery voltage:
200 AH @ 6 VDC
+ 200 AH @ 6 VDC
= 200 AH @ 12 VDC