SamplexPower SCC-1208L Owner's Manual - Section 2 |
6 | SAMLEX AMERICA INC.
SeCtIOn 2 |
Features of the SCC-1208l
deliversaconstantcurrentequaltothe
ShortCircuitCurrentIscoftheSolarPanel.
Thevoltageseenattheoutputofthecon-
trollerwillbetheactualbatteryvoltage
which will keep on rising till it approaches
theAbsorption/GassingVoltageof
14.8V+/-0.2VforFloodedBatteryand
14.5V+/-0.2VforSealedAGMbattery
(at25°C).TheAbsorption/GassingVolt-
ageisthevoltageatwhichtheelectrolyte
in the battery begins to break down into
HydrogenandOxygengases.Onreaching
theAbsorptionVoltage,thecontrollerwill
transitiontotheAbsorptionStage.The
bulkstagerestoresabout80%ofthe
battery’s capacity.
noteS:
As the bulk Charge Stage is a constant
currentstage,thecontrollerdoesnot
controlthevoltageandthevoltageseen
at the output terminals of the controller
willbetheactualbatteryvoltage(thiswill
rise slowly towards the Absorption / Gas-
singVoltageundertheinfluenceofthe
constantchargingcurrent).Also,thecon-
troller does not control the current and
the bulk Charging Current will be equal
totheShortCircuitCurrentIscoftheSolar
Panel. Constant current is ensured by the
constant current characteristic of the Solar
Panelintheregionofupto15V.
!
cAUtion
As already pointed out above, when in
the Bulk charge Stage, the controller is
not able to control the value of the charg-
ing current. the Bulk charging current
will be equal to the Short circuit current
isc of the Solar Panel. Hence, it should
be ensured that the AH capacity of the
battery (at 20 Hr Discharge Rate) is more
than at least 10 times the Short circuit
current isc of the Solar Panel. For exam-
ple, if a 130 W Solar Panel with Short
circuit current isc of around 8 A is being
used, the AH capacity of the battery
should be > 80 AH.
Stage2–AbsorptionStage
DuringtheAbsorptionStage,thecontrol-
ler changes from a constant current to
constantvoltagecharging.Thecharging
voltageisheldconstantneartheGassing
Fig. 2.1 Solar Charging Stages