SDT-0060-00EN Situation: 17.06.2005 831.300 7
Instruction Manual Control and Switch Panel LT 500
Checking the condition of
the battery
Measuring the off-load voltage is a simple and effective method of checking
the condition of the battery. Off-load voltage is the voltage of the charged bat-
tery in a passive state, with no current being supplied or drawn.
Take the measurement several hours after the last charging. In the meantime,
no significant load should have been placed on the battery, which means no
current should have been drawn from it. If the off-load voltage of the battery
is less than 12.0 V, there is a risk of total discharge.
The following table will help you interpret the off-load voltage displayed.
These values apply for lead gel batteries.
It is advisable to check the off-load voltage in the morning before consumers
are switched on.
Charge request
"CHARGE !"
The batteries should be fully charged every 4 weeks to achieve a long service
life.
As a reminder a charge request is displayed as a red "CHARGE !" warning
light 20 days after the last equalising charge or if the capacity of a battery has
fallen below 15 %.
Connect the motorhome to the 230 V power supply.
The batteries are charged..
5.6 Indication of the maximum possible battery capacity
The maximum battery capacity of the living area battery can be indicated, but
it cannot be set. The maximum battery capacity is displayed in % of the nom-
inal capacity. The preset value of 80 % (26 indicator LEDs light up) represents
the maximum battery capacity that can be used practically. The value can rise
to more than 80 %.
Battery switch
Press the right side of the battery switch for more than 5 seconds:
The maximum battery capacity is indicated on the "%" scale in 16 levels
from 0 to 100 %. The illuminated scale points indicate the critical zone in
red, the normal range is green. The "%" display flashes.
The control and switch panel recalculates the maximum battery capacity after
every complete charging cycle (total charge and total discharge) and indi-
cates the current value. This display applies only to the living area battery.
Values for off-load voltage Charging condition of the battery
Less than 10.5 V Totally discharged
12.0 V 0 %
12.2 V 25 %
12.3 V 50 %
12.5 V 75 %
More than 12.8 V Full
W
For more information see section 5.12 as well as the instruction manual of
the Electrobloc.
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