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54 Freedom SW 230V Installation Guide
Battery Information
Table 5 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) 243 Ah @24 V
Recommended Battery Bank Size in Ah (multiply by 2) 486 Ah @24 V
Freedom SW 3K2K 230V InvChg Install Guide.book Page 54 Friday, June 20, 2014 9:11 AM