Samlexpower Evolution EVO-2212 Owner's Manual - Charger
70 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 71
value of input current from Grid/Generator can be programmed (See Appendix A under Group
2 Parameter Select for Input Setting-"Max Current". Default is 30A). The EVO will automati-
cally reduce charging current to support the AC loads on priority and use whatever is extra for
charging. This will prevent overloading of the Grid Branch Circuit/Generator.
5.3 ADAPTIVE CHARGING CONTROL FOR COMPLETE CHARGING AND
PREVENTION OF OVER CHARGING / BOILING OF BATTERIES
An automatic Adaptive Charging Algorithm is used to ensure that the battery is completely
charged in a safe manner for longer battery life. In this algorithm, the time the battery remains
in Absorption and Equalization Stages is proportional to the time the battery remains in the
Bulk Charge Stage. A battery that is deeply discharged will remain in Bulk Stage for a longer
duration and will require longer time in the Absorption and Equalization Stages for complete
charging. On the other hand, a battery that is almost completely charged will remain in the
Bulk Stage for a shorter duration and consequently, will remain in Absorption and Equalization
stages for a shorter duration. This will prevent overcharging / boiling of the battery.
Note: In other inverter chargers that execute Absorption and Equalization Stages for
a fixed time of 4 to 8 Hours, a nearly fully charged battery may overcharge / boil and
hence, will reduce battery life.
5.4 PARALLEL CHARGING OF BATTERIES THROUGH EXTERNAL
CHARGER
The Battery Charger Section is able to operate in parallel with another external charging source
like Solar Charge Controller / AC Charger of up to 50A capacity. The output of the external
charging source is routed through the unit (Connectors 3, 4 in Fig 2.1). Maximum charging cur-
rent from the external charging source is limited to 50A .This limit should not be exceeded!
Please note that Lead Acid batteries should not be charged at very high charging currents to
prevent adverse effects like reduction in returned capacity, excessive surface charge, overheat-
ing, excessive pressure build up in sealed batteries (generation of Oxygen and Hydrogen will
be > recombination) etc. Normally, the maximum charging current is limited to 20% of the Ah
capacity of the battery unless the battery manufacturer allows higher charging current. When
a battery is charged simultaneously by multiple charging sources, all the charging currents will
add up and may result in very high charging current with respect to the Ah capacity of the bat-
tery.
The charging current fed from the external source is measured and the charging cur-
rent generated by the internal charger is automatically controlled to ensure that the
net charging current fed to the battery does not exceed the net programmed Bulk
Charge Current “Io”.
5.5 Battery Temperature Sensor
A Battery Temperature Sensor Model EVO-BCTS has been provided [Fig 2.5(a)]. It comes with
5 m / 16.5 ft cable. Connect the ring terminal end (houses the sensor) on the battery Positive
or Negative post. Connect the RJ-45 plug to the Temperature Sensor Jack (6, Fig. 2.1). The
Temperature Sensor is used to ensure optimum charging by modifying the charging voltages
based on temperature if the battery sees very wide temperature swings. In addition to compen-
sating the charging voltages, the thresholds of “LOW VOLT ALARM”, “BATT LOW VOLTAGE”
shut down, “RESET VOLTAGE” and “BATTERY OVER VOLT” are also temperature compensated.
Temperature compensation will be carried out over a temperature range of –20°C to + 60°C.
SECTION 5 |
Battery Charging in Evolution Series