Automatic and Intelligent 5-Stage Charging Curve
The DFC900N is controlled by a 12-bit AD microprocessor with 5-stage charging
characteristic for charging batteries automobiles, motorcycles, snow mobiles, tractors,
personal watercraft, boats etc.
A microprocessor senses the condition of the battery and controls the regulator to provide
the right current and voltage to the battery (charging characteristic). This will give the best
effect on charging and give the longest life to battery.
Charging characteristic:
1) STD/GEL battery mode
2) Deep cycle battery mode
• Soft Start: Initial battery test to determine battery condition. If the battery is severely
discharged charger will begin the Soft Start stage. Charging starts with reduced current
until battery voltage reaches a normal condition for charge.
• Bulk: Major charging stage where the battery receives the majority of its charge.
During this stage the battery brought to 75 - 80% of its charger. The DFC900N charger
delivers maximum current until the terminal voltage has risen to the full charge level for
Normal battery.
• Absorption: Completes the charge up to virtually 100% at a constant voltage. The
current tapers off until the current reached the minimum level.
• Boost: (Only for Deep cycle battery) the battery is charged deeply at a constant current
and increased voltage to boost the charge capacity of the battery.
• Float (Maintenance):
o For “STD” selection: The maintenance mode is using a charging at constant
voltage, keeping the batteries at 100% charge. Normal charging mode is
time-limited (max 10 days) while Float mode chargers indefinitely without
damaging the battery.
o For “DEEP” selection: The maintenance mode is using pulse charge. When
the battery voltage reaches upper limit(varied according to temperature), the
charger will stop supplying power and until the battery drops to 13,0V, it will
supply constant current again until the battery reaches upper limit. This will go in
cycle until the charging process has been stopped manually. This keeps the
