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SECTION 5 | Battery Charging in Evolution™ Series
• Power Transformer: In case the temperature is >130C, the BULK CURRENT setting is automatically reduced by
0.2% every 20 sec.
• Heat Sink: In case the temperature is >90C, the BULK CURRENT setting is automatically reduced by 0.2% every
20 sec.
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 “BATT EXT” on the optional Remote Control EVO-RC-PLUS. Refer to following display screens from
EVO-RC-PLUS Remote Control Manual.
• During Inverting Mode: Screen No.7 in Fig 3.2(a) under Section 3.6.3.2 of EVO-RC-PLUS Remote Control Manual
• During Charging Mode: Screen No.1 in Fig 3.3(a) of EVO-RC-PLUS Remote Control Manual
• During Power Save Mode: Screen No.5 in Fig 3.4(a) of EVO-RC-PLUS Remote Control 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 Current 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 Remote Control].
The measured value of the charging current received from the external Solar Charge Controller 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 Charging Current
For example, if the “Bulk Current” in the EVO
TM
is programmed at say 40A and the external Solar Charge
Controller is generating 15A, the internal Battery Charging Section will reduce its current from 40A to 25A so
that the net charging current is equal to the programmed value of 40A.
In other Inverter Chargers where this design feature is not available and the Bulk Charging Current of the internal
Battery Charger Section is xed, the batteries are likely to be charged at high Bulk Charging Current = Fixed value
of Bulk Charging Current from the internal Battery Charging Section + Current available from the External Charge
Controller.
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