Progress Solar/Wind SLT 700 Series Operator's Manual page 115

The TriStar MPPT 150V provides seven (7) standard battery charging settings that are selectable with
the settings DIP switches (see Figure 4.1 above). These standard charging settings are suitable for
lead-acid batteries ranging from sealed (gel, AGM, maintenance-free) to Flooded and L-16 cells. In
addition, an 8th charging setting provides for custom set-points using MSView
Shared Settings
Absorption Extension Voltage
Absorption Extension Time
Float Exit Timeout
Float Cancel Voltage
Equalize Timeout
Temperature Compensation Coefficient
1 25°C reference
Table 4-2. Battery settings that are shared between all battery types
The shared settings in Table 4-2 above are common to all battery types. The following
illustrations graphically explain the shared settings.
Absorption Extension
Bulk Absorption
12.50 V
1:00 2:00
Figure 4-3. Absorption extension charging profile.
If battery voltage discharges below 12.50 Volts (25.00 Volts @ 24 V, 50 Volts @ 48 V) the
vious night, Absorption charging will be extended on the next charge cycle as shown in figure 4-3
above. 30 minutes will be added to the normal Absorption duration.
40
TM PC software.
Value Units
12.50 Volts
Absorption Time + 30 minutes
60 minutes
12.30 Volts
Equalize Time + 60 minutes
°C / cell
- 5
1 millivolts /
Extended
Absorption
Float
Absorption Extension Voltage
time (hrs)
3:00 4:00 5:00 6:00
Operation
Float Time-out
Float V
After entering Float stage, the controller will only exit Float if the battery voltage remains below
Float voltage for 60 cumulative minutes. In figure 4-4, 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 60 minutes. After
the load runs for 60 minutes, the time-out causes the controller to return to Bulk charging, and then
Absorption stage once again. In this example, a load runs continuously for 60 minutes. However,
because the Float exit timer is cumulative, multiple momentary load events that pull the battery
voltage below Float voltage for a combined 60 minutes duration will also force an exit from Float
stage.
Float Cancel Voltage
12.30 V
pre-
Bulk Absorption Float Bulk
60 mins.
below Float
Voltage
1:00 2:00 3:00 4:00 5:00
Figure 4-4. Float exit time-out charging profile
Bulk Absorption
Float cancelled this charge cycle
Float Cancel Voltage
1:00 2:00 3:00 4:00 5:00
Figure 4-5. Float cancelled charging profile
TriStar MPPT Operator's Manual
Absorption
time (hrs)
6:00
time (hrs)
6:00
41