Battery Sizing/Selection - Magma CB264 User Manual

M A G M A

Battery Sizing/Selection:

For Batteries Rated in Amp Hours:
Use the following table for matching desired operating hours to battery
capacity ratings.
SUB100WDC Max Rated Load (Watts): 100 Watts
Margin of Safety for Battery Selection: 10%
Column 1
Desired Continuous
Operating Hours
1. Calculations assume continuous operation at maximum
designed load.
2. Margin of safety used is 10%.
3. Determine the number of Desired Continuous Operating Hours
you would like to operate before recharging. (Column 1)
4. Determine the Battery Output Voltage of the battery you would
like to use. (Column 2-4)
5. Read the cell value in the table for the Amp Hours required.
Use this number when choosing a battery (or set of batteries).
6. If you required more than 8 hours- use multiples of a lesser
number of hours.
Examples:
If you want 5 hours of continuous operation with a 14.4VDC battery set:
Locate row 5 in Column 1 of the table above, read across the row to the
14.4VDC Column, you will find that you will need a battery (or set of
batteries) with a total power rating of about 38 Amp Hours.
If you want 10 hours of continuous operation with this same battery set
(at 14.4VDC), would need a total power rating of about 72 Amp Hours
(2 x 38 from the above example).
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Appendix B
1
2
3
4
5
6
7
8
DC Power Information
Column 2-4
Amp Hours
12VDC* 13.2VDC*
9.2
18.3 16.7
27.5 25.0
36.7 33.3
45.8 41.7
55.0 50.0
64.2 58.3
73.3 66.7
*Typical Battery Output Voltage
14.4VDC*
8.3 7.6
15.3
22.9
30.6
38.2
45.8
53.5
61.1