Battery Charging In Evolution; Series - Samlexpower Evolution EVO-1212F Owner's Manual

Evolution series inverter/charger pure sine wave

Table of Contents

SECTION 5 |

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 batteries

(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). High performance, 100 MHz DSP (Digital Signal

Processing) type of micro-controller and Pulse Width Modulated (PWM) conversion circuits are

used for the above implementation.

When AC input power from Grid / Generator is available within the programmed limits of

voltage 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

charging starts, the current does not rise sharply, but ramps up slowly to the full

programmed Bulk Charge current.

The Battery Charger Section of the EVO

MHz DSP micro-controller. Refer to Section 5.6 for details of operation.

5.2.1 Dynamic AC Input Current Diversion Control Between AC Pass Through

Current And Battery Charging Current

EVO

Models have very powerful Battery Charger Section that will require very high AC input

current from the Grid (See Table 5.1).

TABLE 5.1 CHARGING CURRENTS AND PASS THROUGH LOAD CURRENTS

EVO-1212F and

EVO-1212F-HW

EVO-1224F and

EVO-1224F-HW

When batteries are being charged at or near the maximum value of charging current (See TABLE

5.1) and the pass through load current increases, the Grid / Generator supply circuit breaker may

trip if the combined value of the AC side charging current (equivalent to the DC side charging

current) and the pass through load current exceeds the Grid / Generator supply circuit breaker

capacity. This situation is prevented by "Dynamic AC Input Current Diversion Control between AC

Pass through Current and Battery Charging Current". This is accomplished through appropriate

setting of programmable parameters "GRID MAX CURRENT". Optional Remote Control Model

EVO-RC-PLUS will be required for the desired setting (Please refer to Section 4.5.2.2 of the EVO-

RC-PLUS Owner's Manual).

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