Samlexpower Evolution EVO-2212, Owner'S Manual

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68 | SAMLEX AMERICA INC.
AC Charger starts charging the battery. If an external charger is also connected to the
External Charging Terminals, the internal AC Charger will limit the charging current to a
value = (Programmed Value of Charging Current - Value of Current fed from the External
Charger). When the battery voltage rises to the programmed value of “RECONNECT
VOLTAGE” [
12V Version
: 13.50V to 16.00V (Default 14.0V);
24V Version
: 27.00V to
32.00V (Default 27.6V)], the Transfer Relay is de-energized, the unit changes over to
“Inverting Mode” and the AC Output is fed from the internal Inverter Section
This mode is preferred in solar applications where Grid / Generator backup power is
available but the primary source of power is batteries that are charged through Solar
Panels / Charge Controller. The Inverter Section of EVO Inverter Charger will provide
AC power most of the time and AC power from the Grid / Generator will be drawn
to charge the batteries only when the batteries are discharged to Low Voltage Alarm
Threshold due to excessive load or due to long cloudy periods. This application is desir-
able in areas where Grid/Utility Energy Rates are high and use of solar power is more cost
effective.
4.9 TEMPERATURE SENSOR FOR BATTERY CHARGING
Battery Temperature Sensor Model EVO-BCTS (Fig 2.5) has been provided to ensure optimum
charging by modifying the charging voltages based on temperature if the battery sees very wide
temperature swings. Temperature compensation can be programmed with the help of optional
Remote Control EVO-RC (see Appendix A). Range is -3 to -4 mv/ °C/cell (Default is -4 mv/ °C/
cell). Without temperature compensation, the battery life is likely to be drastically reduced be-
cause the battery will be undercharged during cold conditions (will build up sulfation) or will be
overcharged during hot conditions (will boil and lose excessive water).
Please read White Paper
titled “Batteries, Chargers & Alternators” available online at www.samlexamerica.com
(Home > Support > White Papers) and Section 5 titled “Battery Charging in EVO Series”
for more details.
4.10 PARALLEL OPERATION WITH EXTERNAL CHARGER
The Battery Charger Section is able to operate in parallel with another external charging source
like Solar Charge Controller / AC charger with a charging capacity of up to 50 A. The output of
the external charging source is routed through this unit and operates in parallel with the internal
charger. The internal charging current is controlled to ensure that the combined current fed to
the battery does not exceed the programmed Bulk Charging Current. This improves the life of
the battery.
4.11 COOLING FANS AND OVER TEMPERATURE PROTECTION
The unit is cooled by convection and by forced air cooling using 2 variable speed cooling fans.
Temperature is sensed at 5 points (Power Transformer, 2 points for H-Bridge Power Mosfets,
Heat Sink and Low Voltage Bus Bar). The fans will be switched ON at specified temperatures
measured at the above sense points. The speed of the fans is increased as the temperature
rises. The unit will shut down due to over temperature if the sensed temperature rises above
the specified overheat thresholds. It will reset automatically after the unit has cooled down to
the Reset Threshold.
SECTION 4 |
General Description & Principles of Operations