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Appendix B – Battery Information
B-1
Battery Bank Sizing
The size of the battery bank determines how long the inverter can power the
AC loads without recharging. The larger the battery bank, the longer the run
time. Size your battery bank to the system's AC load requirements and the
length of time required to run the load from the batteries. In general, the
battery bank should not be discharged more than 50%.
B-2
Battery Types
Batteries are available in different sizes, amp-hour ratings, voltage, and
chemistries; they also come in liquid or gel, vented or non-vented, etc. They
are also available for starting applications (such as an automobile starting
battery) and deep discharge applications. Only the deep cycle types are
recommended for inverter applications. Choose the batteries best suited for the
inverter installation and cost. Use only the same battery type for all batteries
in the bank. For best performance, all batteries should be from the same lot
and date. This information is usually printed on a label located on the battery.
B-3
Battery Confi guration
The battery bank must be wired to match the inverter's DC input voltage
specifi cations (12 VDC). In addition, the batteries can be wired to provide
additional run time. The various wiring confi gurations are:
•
Series Wiring
Wiring batteries in a series increases the total battery bank output
voltage. A series connection combines each battery in a string until the
voltage matches the inverter's DC requirement. Even though there are
multiple batteries, the capacity remains the same. In the example below
(Figure B-1), two 6 VDC/200 AHr batteries are combined into a single
string—resulting in a 12 VDC/200 AHr bank.
6 volts
(200 AHrs)
12 volt battery bank (total capacity = 200 AHrs)
Figure B-1, Series Battery Wiring
© 2016 Sensata Technologies
Appendix B – Battery information
overcurrent protection
6 volts
(200 AHrs)
to
12 VDC
inverter
30
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