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Battery Types and Sizes
B–4 975-0055-01-01
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 TS400. 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 watt-hours needed for each appliance.
4. Add the total number of watt-hours needed for all the equipment and
multiply it by the number of days between charges.
5. Divide the total watt-hours of AC load between charges by 10. This
gives the battery Ah used between charges.
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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TV 100 W 4 hours 400 Wh
Fan 60 W 4 hours 240 Wh
3 lamps, 60 W each 180 W 4 hours 720 Wh
Laptop computer 60 W 4 hours 240 Wh
Small hand drill 300 W 1 hours 300 Wh
Other loads 100 W 3 hours 300 Wh
Total daily watt-hours of AC load 2200 Wh
x Number of days between charges 2
= Total watt-hours of AC load between charges 4400 Wh
Battery Ah used between charges (divide by 10) 440 Ah
Recommended Battery Bank Size in Ah (multiply by 2) 880 Ah