Samlexpower Evolution EVO-2212 Owner's Manual page 76

SECTIOn 5 |
volt batteries (again, this voltage can vary based upon the desired values programmed through
the "Parameter Setting Menu" of the optional remote Control Model EVO-rC (see Appendix
A). 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.
this stage is displayed as "n-cc" in the charging mode screens in the remote control
evo-rc (Please see Section 3.6.1 at Appendix A).
BULK
(Displayed as "N-CC")
15
V - 0.3V
Absorp
14
Io
13
12
11
10
To
fig 5.1 charging curve for normal 3 Stage charging
The value of the bulk Charge Current "Io" depends upon the total Ampere hour (Ah) capacity
of the battery or bank of batteries. A battery should never be charged at very high charging
current as very high rate of charging will not return the full 100 percent capacity as the Gassing
Voltage rises with higher charging current. As a general rule of thumb, the bulk charging
current "io" should be limited to 10% to 20% of the Ah capacity of the battery (20 hr
rate). higher charging current may be used if permitted by the battery manufacturer.
Programmable range and Default values of bulk Charge Current "Io" are shown in Table 6.2.
The units are shipped with the bulk Charge Current set at the Default Value of 40A.
When the unit enters Charging Mode, it starts working as a battery charger and the charger
will run at full programmed bulk Charge Current until the charger reaches the programmed
Absorption Voltage.
As part of the Adaptive Charging Algorithm, a software timer will measure the time taken from
the instant the unit enters the bulk Charging Mode untill the instant the battery voltage reaches
0.3V below the programmed Absorption Voltage, then registers this time as bulk Charge Time
To and computes the Absorption Time T1 as 10 times the bulk Charge Time To in the internal
"T1 Timer" i.e. T1 = To x 10. The "T1 Timer" is used to determine the time the charging will
take place in the next Absorption Stage.
5.6.1.1 Automatic Adjustments of internal Ac charger current when external
charger is Also charging in Parallel
Please note that if an external charging source is also used to charge the batteries at the same
time in parallel with the internal AC charger of the unit, the charging current of the internal
AC charger will be controlled so that the total charging current of the external charger and the
internal charger is = the programmed bulk Charging Current "Io".
76 | SAMLEX AMErICA INC.
Battery Charging in Evolution Series
ABSORPTION
(Displayed as "N-CV") (Displayed as "Float")
T1
TIME
FLOAT
100%
60%
0%
10 Days
LEGEND
Voltage Curve
Current Curve
Note 1: The voltage curve
shows the voltage output of
charger. The intrinsic battery
voltage may be di erent and
will be proportional to the
state of charge.
Note 2: The graph is for 12V
version. For 24V version,
double the voltages.