Product Manual

2120
1. The battery is charged at constant
current (higher than in two-stage)
until the battery voltage reaches
the absorption voltage.
2. Then the charging current
diminishes as necessary to
maintain the battery at that
voltage.
3. Once the current drops to 10%, the
charging cycle is complete. The unit
switches to keeping the battery at
the oat voltage and will maintain
the battery at full charge until needed.
Three-stage charging is faster than two-stage, but the battery is subjected to higher voltage
and current. Three-stage charging is not recommended for charging loaded batteries because
the unit cannot differentiate between current going to a load connected to the battery and
current being absorbed by the battery; which can cause overcharging.
100%
75%
50%
25%
0%
Time
Three Stage Charge
Bulk
(Constant Current)
Absorption
(Constant Volts)
Float
(Constant Volts)
Volts
Amps
Charging Proles (BCA Only)
This unit has both two-stage and three-stage charging capability. You can choose which type
of charging is used during operation by using the Stage Select switch located on the FRONT
panel. Below are explanations of the two charging proles:
1. The battery is charged at constant
current until the battery’s voltage
reaches the oat voltage.
2. The charging current diminishes as
necessary to maintain the battery at
that voltage.
3. Once the current drops to 10%, the
charging cycle is complete. The
unit will maintain the battery at full
charge until needed.
Two-stage charging is gentler on the battery since the battery is subjected to lower voltage
and current than in three-stage. In addition, a reasonable load can be connected to the battery
without affecting the charger’s ability to keep the battery at full charge.
100%
75%
50%
25%
0%
Bulk
(Constant Current)
Float
(Constant Volts)
Time
Two Stage Charge
Volts
Amps
TWO-STAGE CHARGING
THREE-STAGE CHARGING