Operation
ProStar Operator’s Manual
51
50
4.0
Absorption Extension
1:00
2:00
3:00
4:00
5:00
6:00
12.50 V
Bulk
Extended
Absorption
Float
Absorption
Absorption Extension Voltage
time (hrs)
Figure 4-2. Absorption Extension Charging Profile
If battery voltage discharges below 12.50 Volts (25.00
Volts @ 24V) the previous night, Absorption charging
will be extended on the next charge cycle as shown in
figure 4-2 above. Thirty minutes will be added to the
normal Absorption duration.
Float Time-out
1:00
2:00
3:00
4:00
5:00
6:00
Float V
Bulk
Float
Absorption
Absorption
60 mins.
below Float
Voltage
time (hrs)
Bulk
Figure 4-3. Float Exit Time-out Charging Profile
After entering Float stage, the controller will only
exit Float if the battery voltage remains below Float
voltage for sixty cumulative minutes. In figure 4-3, a
system load turns on at 3:30 hrs when the controller
is in Float stage, runs for one hour, and turns off at
4:30 hrs. The load current draw is larger than the
charge current, causing battery voltage to drop below
Float voltage for sixty minutes. The time-out causes
the controller to return to Bulk charging, and then
Absorption stage again. In this example, a load runs
continuously for sixty minutes.
