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Estimating battery requirements – Xantrex Technology 1200 User Manual

Page 61

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Battery Types and Sizes

B–4

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 watt-hours needed for each appliance.

4. Add the total number of watt-hours needed for all the appliances 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.

Appliance

(A) Power

Consumption

(Watts)

(B) Operating

Time per Day

(Hours)

Daily watt-hours

needed for this

appliance

(= A x B)

TV & VCR

200 W

2 hours

400 Wh

Microwave oven

1400 W

15 min = 1/4 hour

350 Wh

3 lamps, 60 W each

180 W

4 hours

720 Wh

Coffee maker

600 W

15 min = 1/4 hour

150 Wh

Hair dryer

1500 W

6 min = 1/10 hour

150 Wh

Steam iron

700 W

6 min = 1/10 hour

70 Wh

Total daily watt-hours of AC load

1840 Wh

x Number of days between charges

3

= Total watt-hours of AC load between charges

5520 Wh

Battery Ah used between charges (divide by 10)

552 Ah

Recommended Battery Bank Size in Ah (multiply by 2)

1104 Ah

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