Holiday Navigator 2003 Owner's Manual page 336

Electrical Systems - House
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The life of the battery bank will greatly decrease when the Depth of
Discharge (DOD) is below 50%. Charge the batteries whenever they have been
discharged. Batteries left in a discharged condition will eventually no longer
accept a full charge or may not accept a charge at all. Never store the
motorhome with a discharged battery bank. It is better to make several small
discharge and full charge cycles than a few deep DOD cycles.
NOTE: For optimum battery life, the batteries should not be cycled
lower than 60% state of charge.
Equalization Charge:
Many battery manufacturers recommend that an Equalize charge cycle is
initiated on some periodic basis. How often the batteries should be Equalize
charged is strictly up to the battery manufacturer. An equalize charge cycle is
timed event with the Equalize charge voltage generally one volt higher than a
Bulk charge voltage. The high voltage of an Equalize charge cycle can damage
sensitive electronic equipment. Before performing an Equalize charge cycle,
several electronic items need to be disconnected.
NOTE: For more information, refer to the Equalize Charging
procedure.
N A V I G A T O R 2 0 0 3
Battery Depth Discharge % Chart