KUSSMAUL Auto Power 2000 Installation Manual page 78

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