64
Battery Information
This guide for use by qualified personnel only.
Table 6
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 recharge more frequently.
Appliance
(A) Power Consumption
(Watts)
(B) Operating Time per
Day (Hours)
Daily watt-hours needed
for this appliance
(= A × B)
TV & VCR
200 W
2 hours
400 Wh
Small microwave oven
800 W
15 min = 1/4 hour
200 Wh
3 lamps, 60 W each
180 W
4 hours
720 Wh
Coffee maker
600 W
15 min = 1/4 hour
150 Wh
Hair dryer
1500 W
6 min = 1/10 hour
150 Wh
Total daily watt-hours of AC load
1620 Wh
× Number of days between charges
3
= Total watt-hours of AC load between charges
4860 Wh
Battery Ah used between charges (divide by 10 for 12 volt system; divide by 20 for 24 volt system)
486 Ah
Recommended Battery Bank Size in Ah (multiply by 2)
972 Ah
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