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 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

 

 

 

 

B–4

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Xantrex Technology TS400 Estimating Battery Requirements, Battery Sizing Example, 7LPHSHUD\ Dssoldqfh $SSOLDQFH Dwwv +RXUV