ProStar MPPT Operator’s Manual
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4.0
4.2 Battery Charging Information
4-Stage Charging
The ProStar MPPT has a 4-stage battery charging algorithm
for rapid, efficient, and safe battery charging. Figure 4-2
shows the sequence of stages.
NIGHT
NIGHT
BULK
CHARGE
ABSORPTION
FLOAT
EQUALIZE
VOL
TAGE
TIME
Figure 4.2. ProStar MPPT Charging Algorithm
Bulk Charge Stage
During Bulk charging, the battery is not at 100% state of
charge and battery voltage has not yet charged to the Ab-
sorption voltage set-point. The controller will deliver 100%
of available solar power to recharge the battery.
Absorption Stage
When the battery has recharged to the Absorption voltage
set-point, constant-voltage regulation is used to maintain
battery voltage at the Absorption set-point. This prevents
heating and excessive battery gasing. The battery is
allowed to come to full state of charge at the Absorption
voltage set-point. The green SOC LED will blink once per
second during Absorption charging.