
Battery Information
Table 5 Battery Sizing Example
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| Daily |
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| (A) Power Consumption | (B) Operating Time per | for this appliance |
Appliance |
| (Watts) | Day (Hours) | (= A × B) |
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TV & VCR |
| 200 W | 2 hours | 400 Wh |
Small microwave oven |
| 800 W | 15 min = 1/4 hour | 200 Wh |
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3 lamps, 60 W each |
| 180 W | 4 hours | 720 Wh |
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Coffee maker |
| 600 W | 15 min = 1/4 hour | 150 Wh |
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Hair dryer |
| 1500 W | 6 min = 1/10 hour | 150 Wh |
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Total daily |
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| 1620 Wh | |
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× Number of days between charges |
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| 3 | |
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= Total |
| 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 | |||
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| Recommended Battery Bank Size in Ah (multiply by 2) | 486 Ah @24 V |
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.
54 | Freedom SW 230V Installation Guide |