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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 XM 1800. 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 × B)
TV & VCR 200 W 2 hours 400 Wh
Microwave oven 1000 W 20 min. = 1/3 hour 333 Wh
3 lamps, 60 W
each
180 W 4 hours 720 Wh
Coffee maker 600 W 15 min. = 1/4 hour 150 Wh
Steam iron 700 W 6 min. = 1/10 hour 70 Wh
Total daily watt-hours of AC load 1673 Wh
× Number of days between charges 3
= Total watt-hours of AC load between charges 5019 Wh
Battery Ah used between charges (divide by 10) 502 Ah
Recommended Battery Bank Size in Ah (multiply by 2) 1004 Ah
Xantrex_PRO1800.book Page 4 Tuesday, April 24, 2007 11:33 AM