FENDT CARAVAN 2021 Operation Manual page 69

Battery sensor (IBS)
65
7. Installation of electrical devices
It can only function correctly if the wiring and the con-
nections in the base vehicle have been carried out/
allocated according to DIN 72570.
Operation using an auxiliary battery
If the caravan is not connected to the 230 V mains supply, the auxi-
liary battery will supply the electrical system with 12 V DC voltage.
Since the battery only has a limited capacity, the electrical devices
should not be operated for a longer period of time without charging
the battery or connecting the caravan to the 230 V mains connection.
The battery can be charged from different input sources (e.g. via a
230 V mains connection or via the base vehicle's alternator) using
a charging controller). Whereby the source of input with the highest
input voltage supplies the charge current for the connected battery.
If the self-sufficient package is installed by the manufacturer, a AGM
battery is always installed. Generally, you will find this battery in a se-
parate box which, depending on the layout of your camper, is located
in the storage space either under the seating arrangement or the bed.
This AGM battery may not be replaced by a conventional wet battery.
Every battery has a self-discharge. Thus, it is important
that the battery is always fully charged before it is not
used for a longer period of time. Then disconnect
the positive pole on the battery (quick release). Not
using the battery for a longer period of time leads to deep
discharge, which could cause irreparable damage. Always
store your battery in a cool, dry place. The optimal tem-
perature for storing a battery is approx. 15° C. Check the
battery voltage at least every six months and recharge the
battery if the voltage drops to below 12.6 V.
Switch off all devices and lights before you disconnect
the battery. Smoking is absolutely forbidden when wor-
king on the battery or if the battery container is open.
Please also note the label on the battery container.
Description of the differing displays on the TFT display
If the rally package is installed at the factory, it will be fitted with an
intelligent battery sensor made by Hella.
This battery sensor is required for orderly functioning and/or display
on the TFT display and collects the following data among others:
• Battery voltage
• Current balance of the battery
• Maximum available capacity of the battery (ageing of the battery)
• Currently available capacity of the battery (charge state of the
battery)
Please also refer to the information in this chapter on
Page 55 "Battery management".