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Victron Skylla-TG 48 25 Manual

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4.8 Charging batteries with voltage sensing
When high current runs trough a thin cable between the charger and the battery there will
be a voltage loss in the cables. The charging voltage measured at the battery poles will be
lower than the specified voltage and this will result in a longer charging time. However, the
charger is equipped with a voltage sense facility. The battery voltage is exactly measured
and the charger increases the output voltage to compensate for the voltage loss across the
cables.
The charger can compensate for a maximum of 2V voltage loss over the cables. When the
voltage loss is bigger than 2V the “on” led flashes and the failure led illuminates. The
charge voltage will decrease until the voltage loss becomes maximum 2 Volt. The “on” led
flashes and the failure led illuminates until the charger is manually switched off. When this
occurs the battery cables have to be replaced because they are too thin or have bad
connections.
To install the voltage sense option:
Disconnect the mains.
Connect a red 0,75 mm
2
wire to the positive battery pole and the “+Vse” connector of
the charger, see illustration 8.
Connect a black 0,75 mm
2
wire between the negative pole of the battery and the “-
Vse” connector of the charger, see illustration 8.
For properly functioning both wires have to be connected.
Switch on the mains.
The “VSE OK” led on the printed circuit board illuminates when connected correctly.
If this led does not illuminate the voltage sense wires are wrongly connected.
4.9 Intelligent startup
The factory setting of the charger is such that the battery voltage is
checked when the charger is switched on (intelligent startup). In the case
of a flat battery, the charger will start charging in the boost mode. If the
battery voltage is sufficiently high during charger startup, the charger will
be charging in the float mode.
In some situations it may be desirable for the charger not to check the
battery voltage upon startup. With this charger this function is enabled by
sliding dip switch 2 “Watch” to the left.
When this dip switch is positioned on the left, the charger will always
start charging in the boost mode.
Do not use the voltage sense facility in combination with the diode-
splitter compensation, as this will raise the output voltage.
… 23 …


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