Samlexpower SEC-2440A Owner's Manual download pdf (Page 12)

CHARGING STAGES

NOTE: Voltage reading on no load. The output terminals of the charger consist of one

common white / black negative terminal (3) and two red positive terminals (1, 2) for charging

two banks of batteries. Each of the two positive terminals of the two banks has a Schottky

Diode in series for isolation. These isolating diodes have a current dependent forward voltage

drop ranging from 0.2 to 0.3 V (at 0.1 A) to 0.6 V (at 40 - 80 A). Please note that the forward

voltage drop occurs only when current flows through the diode.

The Float and Absorption voltages are tightly regulated before the isolating diodes. How-

ever, the voltages available at the terminals of the two banks will vary with the value of the

charging current because of the current dependent forward voltage drop across the isolating

diodes. The Float and Boost / Absorption voltages before the diodes are, therefore, set 0.2 to

0.3 V higher to compensate for the above forward drop during float condition when the

charging current would have dropped to less than 1 A. Hence, the output voltage at the

terminals of the two banks at no load (nothing connected to the terminals of the banks) will

read 0.2 to 0.3 V higher because there is no forward voltage drop as there is no current flow

through the diodes.

Please also note that the output voltage at the two banks may differ between 0.2 to 0.6 V

depending upon the different values of the charging current being delivered through each.

Page 11

Fig 4. Charging Curve

80% of current

acit

of char

10% of current

acit

of char

Time, Hours

Stage 1

I Phase

Stage 2

Uo Phase

Timed for 4/8

Hours

Stage 3

U Phase

Curve for

Volta

e U, U

Curve for

Current, I

1 ... 11 12 13 ... 35

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Samlexpower SEC-2440A Owner's Manual Page 12