Battery Temperature Sensor - Samlexpower G4-2012A Owner's Manual

SECTION 4 |
(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 Boost
(Absorption) and Equalization stages for a shorter duration. This will
prevent overcharging / boiling of the battery. In other inverter chargers
that execute Boost (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.
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 on page 8). Maximum
charging current 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, overheating, excessive pressure build
up in sealed batteries (generation of Oxygen and Hydrogen will be >
recombination) etc. Normally, the maximum charging current is limited to
10% 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 battery.
The charging current fed from the external source is measured and
the charging current 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.

battery Temperature Sensor

A Battery Temperature Sensor Model BTS-G4 has been provided
(Fig 2.4, page 8). It comes with 10' cable. Connect the ring terminal
end (houses the sensor) on the battery Positive post. Connect the 6P2C
Parameter
Bulk Charging Current 10 to 80A (Steps of 10A)
Boost (Absorption) voltage 14 to 16 vDC
Time in Automatic – will be computed based on the time the battery remains in Bulk Mode
Boost (Absorption) Minimum: 1 Hour
Stage Maximum: 12 Hours
Float voltage 13 to 15 vDC
Equalization voltage 14 to 16 vDC
Equalization Time Automatic – Will be computed based on the time the battery remains in Bulk Stage
Equalization Current Automatic - Will be computed at 50% of the set Bulk Charge Current
battery Charging in
G4 Series
TAbLe 4.1: bATTeRY CHARGInG PARAMeTeRS
12V Version
Programmable Range
plug to the Temperature Sensor connector (#6, Fig. 2.1 on page 8). 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. Temperature compensation will be carried out over
a temperature range of – 20°C to + 50°C. The sensor has a voltage
Coefficient of -4 mv/°C/cell that has been programmed as default value
(see setting SCREEN 7 on page 41).
3 stage Charging Profile: Bulk, Boost
(absorption) & Float For normal Charging
Normal day to day charging is performed in a 3 stage cycle—BULK,
BOOST (Absorption), AND FLOAT— to provide rapid and complete
charge cycles without undue battery gassing. Please see Table 4.1 for
details of programmable settings.
Fig. 4.1 shows the voltage and current charging curves with respect to
time and different charge stages.
NOTE: An optional, manually activated 4 Stage Charging including
the 4th Equalization Stage is required to be carried out only on
flooded / wet cell batteries. The charging profile in this stage is
discussed separately under "4 Stage Charging Profile in manually
activated Equalization Mode (page 17)."
bulk Charge Stage
In the first stage, known as the Bulk Charge Stage, the charger delivers
the maximum charge current "Io" that has been set through the
"Settings Menu" (SCREEN 6, page 41). This current is delivered to the
batteries until the battery voltage approaches its Gassing voltage (Boost
or Absorption voltage)—typically around 14.4 volts for 12 volt batteries
and 28.8 volts for 24 volt batteries (again, this voltage can vary based
upon the desired values programmed through the "Settings Menu"
(SCREEN 4, page 41). The Bulk Charge Stage restores about 75% of
the battery's charge. The Gassing voltage is the voltage at which the
electrolyte in the battery begins to break down into Hydrogen and
Oxygen gases. Under normal circumstances, a battery should not be
charged at a voltage above its Gassing voltage (except in the manually
selected Equalization Stage) since this will cause the battery to lose
electrolyte and dry out over time.
Default Programmable Range
10A 10 to 70A (Steps of 10A)
14.4 vDC 28 to 32 vDC
13.5 vDC 26 to 30 vDC
15.3 vDC 28 to 32 vDC
24V Version
Default
10A
28.8 vDC
27 vDC
30.6 vDC
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