Samlex America MSK-10A - Manual (Page 15)

14 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 15
SeCtIOn 4 | Operation
following two types charging cycles are used to ensure return of 100% capacity and also
to prevent excessive gassing:
- Normal Charging Cycle (fig 4.1A): This cycle is used for normal day-to-day charging.
Charging is sequential: Stage 1: bulk Stage (Maximum available Current = Instantaneous
Short Circuit Current “Isc” of the panel)
Stage 2: Absorption (boost) Stage (Constant
Voltage) Stage 3: float Stage (Constant Voltage).
- equalization Charging Cycle (fig 4.1b): This is carried out automatically if the battery is
over discharged to 11.1V (12V battery) / 22.2V (24V battery) Stage 1: bulk Stage (Maxi-
mum available Current = Instantaneous Short Circuit Current “Isc” of the panel)
Stage 2: equalization Stage (Constant Voltage) Stage 3: float Stage
(Constant Voltage).
Transition from one stage to the other will be controlled by the selected Voltage Transi-
tion Set Points based on the type of battery as follows:
• Absorption (Boost) Transition Voltage Set Point “Va”
- “Va” for 12V battery: 14.2V for Gel / 14.4V for Sealed (AGM) / 14.6V for flooded
- “Va” for 24 V battery: 28.4V for Gel / 28.8V for Sealed (AGM) / 29.2V for flooded
• Equalization Transition Voltage Set Point “Ve”
- “Ve” for 12V battery: Gel is not equalized / 14.6V for Sealed (AGM) / 14.8V for flooded
- “Ve” for 24 V battery: Gel is not equalized / 29.2V for Sealed (AGM) / 29.6V for flooded
• Float Transition Voltage Set Point “Vf”
- “Vf” for 12V battery: 13.8V for Gel / 13.8V for Sealed (AGM) / 13.8V for flooded
- “Vf” for 24 V battery: 27.6V for Gel / 27.6V for Sealed (AGM) / 27.6V for flooded
noRMAL cHARGinG cYcLe
Please refer to fig 4.1A
As pointed out above, this charging cycle is carried out for normal day to day charging.
Charging is sequential: Stage 1:
bulk Stage (Maximum available Current = Instantaneous
Short Circuit Current “Isc” of the panel ( Current) Stage 2: Absorption (boost) Stage
(Constant Voltage) Stage 3: float Stage (Constant Voltage).
Stage 1 - bulk Stage
This is almost a constant current stage. During this stage, the Mosfet Switch is kept at
100% Duty Cycle (oN continuously) and hence, maximum current equal to the available
instantaneous Short Circuit Current "Isc" of the panel is fed to the battery and the bat-
tery voltage starts rising. When the voltage rises to the Absorption Transition Voltage
Set Point “Va”, the controller transitions to Absorption (boost) Stage. At the end of the
bulk Stage, the battery is charged to around 80% capacity. The balance of 20% capacity
is restored in the next Absorption (boost) Stage.
STATUS LeD “bATT” is steady Green during this stage
Stage 2 - Absorption (boost) Stage
The controller enters this stage from the previous bulk Stage when the battery voltage
rises to the Absorption (boost) Transition Voltage Set Point “Va” which is internally set
as follows:
- “Va” for 12V battery: 14.2V for Gel / 14.4V for Sealed (AGM) / 14.6V for flooded;
- “Va” for 24 V battery: 28.4V for Gel / 28.8V for Sealed (AGM) / 29.2V for flooded
This stage is timed for 2 Hrs - either continuous or cumulative