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Estimating Battery Requirements
72 Prosine 2.5/3.0 Installation & Operation Guide
When sizing your battery, be conservative, and resist the temptation to skip the last (multiply by 2)
step of this calculation. 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 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 75 for more information on battery inter-connection schemes.
The following worksheet is provided as a guide for determining your battery needs. Be generous in
estimating the time for which you will run each of the loads to ensure sufficient battery capacity.
Table 4: Battery Sizing Worksheet
Appliance (A)
Power
Consumption
(B)
Operating
Time per day
Daily watt-
hours needed
for this
appliance
( = A x B )
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
W hours Wh
Total Daily Watt hours of AC load: Wh
x Number of Days between charges:
= Total Watt hours of AC load between charges: Wh
Battery Ah used between charges
(divide by 10 for 12V system, divide by 20 for 24V system)
Ah
Recommended Battery Bank Size in Ah (multiply by 2) Ah