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Battery Sizing Example
Battery Sizing Example
This example illustrates a typical calculation, assuming an opportunity to charge the batteries every three days.
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| needed for this | |
| (A) Power | (B) Operating | appliance |
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Appliance | Consumption | Time per Day | (= A x B) |
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TV & VCR | 115 W | 3 hours | 345 Wh | |
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Sewing machine | 150 W | 1 hour | 150 Wh | |
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Bread maker | 600 W | 1 1/2 hour | 900 | Wh |
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Blender | 300 W | 15 min = 1/4 hour | 75 | Wh |
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| Total Daily | 1470 | Wh | |
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| x Number of Days between charges |
| 3 | |
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= Total | 4410 | Wh | ||
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Battery Ah used between charges (divide by 10) | 441 Ah | |||
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Recommended Battery Bank Size in Ah (multiply by 2) | 882 Ah | |||
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This example illustrates how quickly your battery needs can escalate. To reduce the required battery size, you can conserve energy by eliminating or reducing the use of some loads or
When sizing your battery, resist the temptation to skip the last step of this calculation (multiplying by 2). More capacity is better since you will have more reserve capacity, be better able to handle large loads and surge loads, and your battery won't be discharged as deeply. Battery life is directly dependent on how deeply the battery is discharged. The deeper the discharge, the shorter the battery life.
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