70 | SAMLEX AMERICA INC.
i
INFO
For background information on batteries and charging process, please read Section
1.4, “General Information - Lead Acid Batteries”. All battery charging voltages are
specified at battery temperature of 25
˚
C / 77
˚
F.
5.1 PRINCIPLE OF OPERATION OF BATTERY CHARGING SECTION
EVO Series is a Bi-directional Inverter / Charger with a Transfer Relay that operates either as
an inverter OR as a battery charger. It uses a common Converter Section that can work in two
directions – in one direction it converts external AC power to DC power to charge the batter-
ies (Charging Mode) and in the other direction, it converts the DC power from the battery to
AC power (Inverting Mode). PWM design is used for both the charging and inverting sections.
Please note that it cannot work in both the directions at the same time (i.e. it cannot work as
an inverter and as a charger at the same time).
When AC input power from Grid / Generator is available within the programmed limits of volt-
age and frequency, the internal Transfer Relay passes through the AC input to the AC loads and
at the same time, the AC input is fed to the Battery Charger Section.
First, the AC input voltage is stepped down by the Low Frequency Isolation Transformer and is
then rectified by 4 sets of H-Bridge Mosfets and fed to the batteries for charging. When charg-
ing starts, the current does not rise sharply, but ramps up slowly to the full programmed Bulk
Charge curent.
The Battery Charger Section of the EVO is a powerful, 100 MHz DSP micro-controller based, 3
Stage or a 4 Stage Charger. Battery charging parameters are detailed at Table 5.1.
3 Stage Charging Algorithm (Default) is used for normal day to day charging. The 3 stages are
– Bulk, Absorption and Float. The charging voltages and currents are programmable within the
ranges given in the Table 5.1 to take care of a wide range of battery types like flooded, AGM,
Gel Cell, Lead Calcium etc. For details, see Section 5.6 and Charging Curves at Fig 5.1.
4 Stage Charging Algorithm is used in the Equalization Mode. Equalization Mode is selected
using optional Remote Control EVO-RC (see Appendix A). This mode is used only for Flooded
or Wet Cell batteries. The 4 stages will be - Bulk, Absorption, Equalization and Float. For details,
see Section 5.7 and Charging Curves at Fig 5.2. Equalization Mode is desirable for the proper
health of Wet Cell Batteries. Equalization voltage is programmable. Equalization current and
Equalization time are computed automatically. Please see Table 5.1 for details.
5.2 DYNAMIC INPUT POWER DIVERSION CONTROL OF BATTERY
CHARGING CURRENT
In Charging Mode, the net AC input current from the Grid / Generator is the sum of the AC
side charging current and the pass through load current. Based on the rated capacity of the
Grid Branch Circuit / Generator, the net AC input current will be required to be limited to pre-
vent overloading of the Grid Branch Circuit / Generator.
EVO Series has a very powerful battery charger that will require a proportionate higher AC input
current from the Grid/Generator. The Grid Branch Circuit/Generator will also be required to
provide current to the AC loads. With the optional Remote Control Model EVO-RC, the desired
SECTION 5 |
Battery Charging in Evolution Series
Summary of Contents for Evolution EVO-2212
Page 89: ...SAMLEX AMERICA INC 89 Notes ...
Page 90: ...90 SAMLEX AMERICA INC Notes ...
Page 91: ...SAMLEX AMERICA INC 91 Notes ...
Page 133: ...SAMLEX AMERICA INC 41 APPENDIX A Notes ...
Page 134: ...42 SAMLEX AMERICA INC APPENDIX A Notes ...
