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Appendix B - Battery Information
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Appendix B - Battery Information
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%.
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.
Battery Confi guration
The battery bank must be wired to match the inverter’s DC input volt-
age speci fi cations (12 VDC). In addition, the batteries can be wired to
provide additional run time. The various wiring con fi 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 14), two 6 VDC/200 AHr batteries are combined into a
single string – resulting in a 12 VDC/200 AHr bank.
6 volts
(200 AHrs )
6 volts
(200 AHrs)
overcurrent protection
12 volt battery bank (total capacity = 200 AHrs)
To
12 VDC
Inverter
Figure 14, Series Battery Wiring