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Battery Types and Sizes
Estimating Battery Requirements
To determine how much battery capacity you need:
1.Determine how many watts are consumed by each appliance that you will operate from the XPower Plus. You can normally find the watt rating labelled on the product. If only the current draw is given, multiply it by 115 to get the power consumption in watts.
2.Estimate how many hours each appliance will be operating each day.
3.Calculate the daily
4.Add the total number of
5.Divide the total
6.Double the total Ah used between charges to get the recommended battery size in Ah.
See the battery sizing example that follows.
Battery Sizing Example
This battery sizing example illustrates a typical calculation, assuming an opportunity to charge the batteries every three days.
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| (A) Power | (B) Operating | needed for this |
| Consumption | Time per Day | appliance |
Appliance | (Watts) | (Hours) | (= A x B) |
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TV & VCR | 200 W | 2 hours | 400 Wh |
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Microwave oven | 1400 W | 15 min = 1/4 hour | 350 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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Steam iron | 700 W | 6 min = 1/10 hour | 70 Wh |
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| Total daily | 1840 Wh | |
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| x Number of days between charges | 3 | |
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= Total | 5520 Wh | ||
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Battery Ah used between charges (divide by 10) | 552 Ah | ||
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Recommended Battery Bank Size in Ah (multiply by 2) | 1104 Ah | ||
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