Felicitysolar MPPT User Manual

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Equalization function is added into solar charge controller. It reverses the buildup of negative chemical effects
like stratification, a condition where acid concentration is greater at the bottom of the battery than at the top.
Equalization also helps to remove sulfate crystals that might have built up on the plates. If left unchecked,
this condition, called sulfation, will reduce the overall capacity of the battery. Therefore, it’s recommended to
equalize battery periodically.
5.2 Equalize Stage
NIGHT
BULK
CHARGE
ABSORPTION FLOAT NIGHT
VOLTAGE
TIME
CURRENT
TIME
EQUALIZE
In Absorption stage, if the charging current drops lower than the maximum charging current of battery
equalization, the controller will start to enter Equalize stage.
When to Equalize
NIGHT
BULK
CHARGE
FLOAT NIGHT
VOLTAGE
TIME
CURRENT
TIME
ABSORPTION
EQUALIZE
The Max. charging current
of equalization
If solar charge controller is working in float stage, but at this time, the setting equalization interval (battery
equalization cycle) is arrived, it will transfer to equalize stage.
ABSORPTION
BULK
FLOAT
Equalize Voltage
Float Voltage
FLOAT
EQUALIZE
MPPT solar charge controller MPPT solar charge controller
In general, this solar charge controller is designed with 3-stage battery charging algorithm for fast, efficient,
and safe battery charging. The following picture shows the sequence of charging stages.
5. CHARGING LOGIC
5.1 3-stage Charging
NIGHT
BULK
CHARGE
ABSORPTION FLOAT NIGHT
VOLTAGE
TIME
CURRENT
TIME
1) Bulk charge stage
In bulk charge stage, charge current begins to flow, typically at the maximum rate of the charge source. The
controller will supply solar power to charge battery as much as possible.
2) Absorption stage
When battery charging voltage is reached to Absorption voltage point, the charging stage changes from bulk
charge to Absorption. Constant-voltage regulation is used to maintain battery voltage at the Absorption stage.
If the charging current drops to one-tenth of the maximum charging current setting point, the charging status
will change to Float stage.
Voltage
Current
FLOAT
One-tenth of Max.
charging current set point
ABSORPTION
Absorption
Voltage
FLOAT
BULK
ABSORPTION
C.V. Charging
Time
If the elapsed time of absorption stage is over
setting value for C-V charging time, it
will also transfer to Float stage.
3) Float Stage
After the battery is fully charged in the Absorption stage,
the controller will reduces the battery voltage to the
setting point of Float voltage. Once in Float stage,
constant-voltage regulation is used to maintain battery
voltage at setting point of float voltage.
In lithium battery mode: the charging logic has no
floating charge stage
ABSORPTION
BULK
FLOAT
BULK
ABSORPTION
Lower than
float voltage
for 30 min.
Float
Voltage
ABSORPTION
BULK
FLOAT
BULK
ABSORPTION
Float Voltage
FLOAT Cancel
Voltage
Float timeout
If the battery voltage remains lower than the Float
voltage for 30 minutes, the controller will return to
Bulk charging stage.
Once the battery voltage drops to setting point of
Float cancel voltage, the controller also returns to
Bulk charging stage. Float cancel voltage = Floating
charging voltage – (1V x battery numbers in series)
Float cancel voltage
( No floating charge
in lithium battery mode )

Felicitysolar MPPT Specifications

General

Brand	Felicitysolar
Model	MPPT
Category	Controller
Language	English