5.0
Operation
46
GenStar MPPT
47
GenStar MPPT LVD-LVR (Load Control) and Current Compensation Profiles
Table 5-4. GenStar MPPT Preset LVD-LVR and Current Compensation Profiles
LVD
LVR
LVD Warning Current Comp.
Volts
Volts
Minutes
mV/A
1 - Lead Acid
11.10
12.60
10
0
2 - Lead Acid
11.50
12.80
10
-4
3 - Lead Acid
11.70
12.90
20
-6
4 - Lead Acid
12.00
13.20
20
-6
5 - Lithium LiFePO4
12.50
13.15
1
0
6 - Lithium LiFePO4
12.70
13.25
2
-1
7 - Lithium LiFePO4
12.85
13.30
5
-2
Load Control Type-
Preset
Table 5-3. GenStar MPPT Shared Preset Charging Settings
GenStar MPPT Shared Settings
Shared Setting
Lead-Acid Value
Lithium Value
Units
Absorption Extension Voltage
12.5
Disabled
Volts
Absorption Extension Time
Absorption Time + 30
NA
Minutes
Float Exit Time-out Voltage
12.6
13.3
Volts
Float Exit Time-out
60
60
Minutes
Float Cancel Voltage
12.0
Disabled
Volts
Equalize Time-out
Equalize Time +60
1
NA
Minutes
Temperature Compensation
Co-efficient
-30
Disabled
Millivolts/°C/
12V
Compensation Temperature Range
- 20 to +40
NA
°C
Low Temperature Folback 100%
Disabled
+2
°C
Low Temperature Folback 0%
Disabled
0
°C
1
If equalization is enabled
Load HVD
Load HVR
Volts
Volts
1 - Lead-acid
Disabled
Disabled
2 - Lead-acid
Disabled
Disabled
3 - Lead-acid
Disabled
Disabled
4 - Lead-acid
Disabled
Disabled
5 - LiFePO4 - Low
14.8
13.8
6 - LiFePO4 - Medium
14.8
13.8
7 - LiFePO4 High
14.8
13.8
Battery Type-Preset
GenStar MPPT Load
HVD-HVR Preset
Charging Settings
Table 5-2. GenStar MPPT HVD-HVR
Preset Charging Settings
5.2.3 Bulk Charging Stage
During Bulk charging, the battery is not at 100% state of charge and battery voltage has not yet
charged to the Absorption voltage set-point. The controller will deliver 100% of available solar
power to recharge the battery.
5.2.4 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.
The battery must remain in the Absorption charging stage for a cumulative 150-180 minutes,
depending on battery type, before transition to the Float stage will occur. However, Absorption time
will be extended by 30 minutes if the battery discharges below 12.50 volts (12V system) the previous
night.
The Absorption set-point is temperature compensated through either the on-board local
temperature sensor, or an optional Remote Temperature Sensor (RTS), if connected.
5.2.5 Float Stage
After the battery is fully charged in the Absorption stage, the GenStar MPPT reduces the battery
voltage to the Float voltage set-point. When the battery is fully recharged, there can be no more
chemical reactions and all the charging current is turned into heat and gasing. The float stage
provides a very low rate of maintenance charging while reducing the heating and gasing of a fully
charged battery. The purpose of float is to protect the battery from long-term overcharge. The green
SOC LED will blink once every two (2) seconds during Float charging.
Once in Float stage, loads can continue to draw power from the battery. In the event that the system
load(s) exceed the solar charge current, the controller will no longer be able to maintain the battery
at the Float set-point. Should the battery voltage remain below the Float set-point for a cumulative
sixty minute period, the controller will exit Float stage and return toBulk charging.
The Float set-point is temperature compensated through the included Remote Temperature Sensor
(RTS), if connected.
5.2.6 Equalization Stage
WARNING:
Risk of Explosion
Equalizing vented batteries produces explosive gases. The battery bank must be
properly ventilated.
CAUTION:
Equipment Damage
Equalization increases the battery voltage to levels that may damage sensitive DC loads. Verify all
system loads are rated for the temperature compensated Equalize voltage before beginning an
Equalization charge.
CAUTION:
Equipment Damage
Excessive overcharging and gasing too vigorously can damage the battery plates and cause
shedding of active material from the plates. An equalization that is too high or for too long can be
damaging. Review the requirements for the particular battery being used in your system.
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