APPENDIX C BATTERIES
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Battery Bank Sizing Example
The following battery sizing example illustrates a typical calculation,
assuming an opportunity to charge the batteries every three days:
Table 11 Battery Sizing Example
This example illustrates how quickly your battery needs can escalate. To
reduce the required battery bank size, you can either conserve energy by
eliminating or reducing the use of some loads, or re-charge more frequently.
When sizing your battery, be conservative and resist the temptation to skip the
last step of this calculation (multiply by 2). More capacity is better since you
will have more reserve capacity, be better able to handle large loads and surge
loads, and your battery won't be discharged as deeply. Battery life is directly
dependent on how deeply the battery is discharged. The deeper the discharge,
the shorter the battery life.
As your power requirements increase, you may need to use more than one
battery to obtain sufficient capacity. Batteries can be connected in parallel or
in series to create higher capacity systems. It is not recommended to connect
batteries from different manufacturers, different types, or that have different
amp-hour ratings in parallel. Improper charging and decreased battery life will
result. See “Cabling & Hook-up Configurations‚” on page 116 for more
information about battery inter-connection schemes.
Appliance
(A) Power
Consumption
(B) Operating Time
per Day
Daily watt-
hours needed
for this
appliance
(= A x B)
TV & VCR 200 W 2 hours 400Wh
Small microwave
oven
800 W 15 mins = 1/4 hour 200Wh
3 lamps, 60W each 180 W 4 hours 720Wh
Coffee maker 600 W 15 mins = 1/4 hour 150Wh
Hair dryer 1500W 6 mins = 1/10 hour 150Wh
Total Daily watt-hours of AC load 1620Wh
x Number of Days between charges 3
= Total Watt-hours of AC load between charges 4860Wh
Battery Ah used between charges
(divide by 10 for 12V system; divide by 20 for 24V system)
486Ah
Recommended Battery Bank Size in Ah (multiply by 2) 972Ah
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