Product Manual
82 | SAMLEX AMERICA INC.
5.3 ADAPTIVE CHARGING CONTROL FOR LEAD ACID BATTERIES
WITH NO EXTERNAL DC LOAD ON THE BATTERIES
6 programmable "CHARGING PROFILES" are available (See Section 5.6 and Table 5.2).
For charging Lead Acid Batteries that do not have external DC loads connected to them, op-
tion is available for an automatic Adaptive Charging Algorithm to ensure that the battery is
completely charged in a safe manner for longer battery life. (For programming information,
refer to programming option "0 = 3 Stage Adaptive" for parameter "Charging Prole" under
Section 4.4.2.21 in the EVO-RC-PLUS manual). 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 xed
time, a nearly fully charged battery may overcharge / boil and hence, will reduce battery life.
5.4 PARALLEL CHARGING USING EXTERNAL SOLAR CHARGER
The batteries feeding the EVO
TM
can also be charged using appropriately sized external solar
charging system. The output of the solar panels will feed to an appropriately sized external Solar
Charge Controller. Output of the external Solar Charge Controller is fed to the input terminals
marked “EXT Charger” (3,4 in Fig 2.1). Maximum charging current on these terminals is
to be limited to 50A. This limit should not be exceeded!
The charging current received from the external Solar Charge Controller is directly fed to
the battery terminals (1,2 in Fig 2.1) through a series connected Hall-effect Current Sensing
IC with integrated shunt. The value of this current is displayed as “External: x.xxA” on the
optional Remote Control EVO-RC-PLUS (Please see display Screen No. 7 in Figs 3.1 to 3.4 of
EVO-RC-PLUS manual).
The net Bulk Charging Current fed to the battery bank will, thus, be as follows:
• Net Bulk Charging Current fed to the battery bank= Adjusted Bulk Charging Current from the
internal Battery Charging Section + Current available from the external Solar Charge Controller
Normally, Lead Acid batteries should not be charged at very high Bulk Charging Current as this
will damage the batteries due to overheating and cell degradation. Normal Bulk Charging Cur-
rent is in the range of 10% to 20% of the Ah capacity of the battery bank at C/20 Discharge
Rate. Check with the battery manufacturer regarding recommended Bulk Charging Current for
your battery bank. This value of “Bulk Charging Current” should be programmed as “BULK
CURRENT” using the optional Remote Control EVO-RC-PLUS (Refer to Section 4.4.2.1 in the
Owner’s Manual for EVO-RC-PLUS).
The measured value of the charging current received from the external Solar Charge Control-
ler is monitored by the control circuitry of the internal Battery Charging Section. The amount
of Bulk Charging Current produced by the internal Battery Charging Section is adjusted in real
time to satisfy the following condition:
•
Internal Bulk Charging Current = Programmed Value of “BULK CURRENT” – External Charg-
ing Current
SECTION 5 | Battery Charging in Evolution
TM
Series