SDT-0018-02EN
Situation: 18.07.2005
11
Instruction Manual Control and Switch Panel DT 201 B
The following table will help you correctly interpret the living area battery volt-
ages displayed by the control and switch panel. These values apply to actual
operation, not off-load voltage and for lead gel batteries only.
1)
depending on the current load
Checking the condition of
the battery
Measuring the off-load voltage is an additional method of assessing the con-
dition of the battery. Off-load voltage is the voltage of the charged battery 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.
Battery voltage
Description
10.5 or less
P
Risk of total discharge
P
The battery monitor switches off all
consumers (apart from the frost
protection valve)
11 V or more
The 12 V power supply can be switched
on using the main switch
10.5 V to 12 V
P
If the voltage falls below 12 V, the
battery alarm is triggered
P
If the voltage remains under
10.5-12 V
1)
for more than 1 minute,
the battery capacity is set to zero
P
If the voltage remains under
10.5-12 V
1)
for more than 5 minutes,
the system is switched off
12 V to 13.2 V
Battery off load
More than 13.2 V
Battery is being charged: Main charge
13.8 V constant
Trickle charge voltage
14.3 V
Final charging voltage (equalising
charge)
P
1 h for lead acid battery
P
8 h for lead gel battery
W
If the living area battery is totally discharged or overcharged for a lengthy
period, it will be irreparably damaged.
W
If the 12 V power supply is overloaded, switch off some of the consumers.
W
Inactive consumers can gradually discharge the battery.
Values for off-load voltage
Charging condition of the battery
12 V
0 %
12.2 V
25 %
12.3 V
50 %
More than 12.8 V
Full
