Battery Sizing Worksheet - Xantrex XM 1000 Owner's Manual

Xantrex_PRO1800.book Page 5 Tuesday, April 24, 2007 11:33 AM

Battery Sizing Worksheet

Appliance
Recommended Battery Bank Size in Ah (multiply by 2)
975-0263-01-01
This example illustrates how quickly your battery needs can escalate. To
reduce the required battery size, you can conserve energy by eliminating
or reducing the use of some loads or by re-charging more frequently.
When sizing your battery, resist the temptation to skip the last step of this
calculation (multiplying by 2). More capacity is better since you will have
more reserve capacity, be better able to handle large loads and surge
loads, and your battery won't be discharged as deeply. Battery life is
directly dependent on how deeply the battery is discharged. The deeper
the discharge, the shorter the battery life.
Use the following worksheet to calculate your battery needs. To ensure
sufficient battery capacity, be generous when estimating the operating
time per day for each of the loads you will run.
(A) Power (B) Operating Time
Consumption (Watts) per Day (Hours)
W
W
W
W
W
W
W
W
Total daily watt-hours of AC load
× Number of days between charges
= Total watt-hours of AC load between charges
Battery Ah used between charges (divide by 10)
Estimating Battery Requirements
Daily watt-hours needed
for this appliance
(= A × B)
hours
hours
hours
hours
hours
hours
hours
hours
Wh
Wh
Wh
Wh
Wh
Wh
Wh
Wh
Wh
Wh
Ah
Ah
B–5