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4.2 Battery Charging
Charging lead-acid batteries
The MPPT has a 4-stage battery charging algorithm for rapid, efficient, and safe
battery charging.
1 - CC Stage (Constant Current Charging): Fast Charging
2 - CV Stage (Constant Voltage Charging): Absorption Charging
3 - CF Stage (Floating Charging): Protect the battery from long-term overcharge.
And make up the loss of self-discharge
4 - Equalization Stage: Activate battery chemical reaction
Charging Lithium ion batteries
The MPPT will charge according to the specifications of lithium-ion battery, which is
mainly divided into two stages. First stage, when the battery voltage is less than the
saturation voltage, it will charge quickly, and the second stage, when the battery
voltage is equal to the saturation voltage, it will absorb charge.
Battery Charge Setting
Charging parameters of lead-acid battery. All voltage settings listed are for nominal
12 Volt batteries. Multiply the voltage settings by two (2) for 24 Volt batteries.
Battery Charging Set-points (@ 25°C): [multiply voltages by (2) for 24 volt systems]
Bat
CV
Type
(volts)
Gel
14.2
(GEL)
Sealed
14.4
(SEL)
Flooded
14..6
(FLD)
AGM
14.1
Custom
Custom
Charging parameters of lithium ion battery.
Bat Type
LiFePO4-4s
CF
Equalize
(volts)
(volts)
13.8
14.2
13.8
14.6
13.8
14.8
13.7
14.4
Custom
Custom
Nominal
Saturation
Voltage
12.8
Equalize
(minutes)
30 Custom
30 Custom
30 Custom
30 Custom
30 Custom
Voltage
14.4
Undervoltage
Undervoltage
protection
Recovery
11.1
11.1
11.1
11.1
Custom
Cut-off
Voltage
recovery
10.8
0
0
12.6
12.6
12.6
12.6
Custom
Cut off
12.4
10
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