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The value of the Bulk Charge Current “Io” depends upon the total Ampere Hour (Ah) capac-
ity 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 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”.
For example, if the programmed charging current is say 40A and the charging current of the
external charger is 30A, the internal AC charger will output only 10A (Programmed setting of
40A – external charging current of 30A = 10A). Similarly, if the programmed setting is say 30A
and the external charger is 50A, the internal AC charger will not provide any charging.
5.6.2 Absorption Stage
During the Absorption Stage, the charging voltage is held constant near the Gassing Voltage to
ensure that the battery is further charged to the full capacity without overcharging. The Absorp-
tion Stage restores the remaining 25% of the battery’s charge. The time the charger remains in
the Absorption Stage is proportional to the depth of discharge of the battery. When the battery
is more discharged, it will take longer time in the Bulk Charge Stage to reach the Gassing Volt-
age. As a part of the Adaptive Charging Algorithm, the “T1 Timer” (explained above) computes
the time the charging takes place in this stage.
•
The “T1 Timer” has minimum time of 1 hour and a maximum time of 12 hours.
•
When the T1 Timer runs out, the charger will enter the next Float Stage.
•
Programmable range and Default values of Absorption Voltage are shown in Table
5.1.
This stage is displayed as "N-CV" in the Charging Mode screens in the Remote Control
EVO-RC (Appendix A).
SECTION 5 |
Battery Charging in Evolution Series
Summary of Contents for Evolution EVO-2212
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