Temperature Sensor - Dometic BUTTNER MT LB50 Montage- Und Bedienungsanleitung

Battery charging function
The charging characteristics for fully automated
continuous operation without monitoring are
referred to as IU0U characteristics (see charging
curve in fig. 8, page 6).
1: I phase (Constant current phase)
At the beginning of the charging process, the
empty battery is constantly charged with the maxi-
mum charging current (100 %). The charging cur-
rent decreases when the battery has reached a
state of charge of 75 % (90 % for lithium batteries).
Deeply discharged lead batteries are charged with
reduced charging current until the battery voltage
exceeds 8 V.The duration of the I phase depends
on the state of the battery, the load from the con-
sumers and the state of charge. For safety reasons
the I phase is terminated after a maximum of 15 h
(in case of battery cell defects or similar).
2: U1 phase (Constant voltage phase)
The U1 phase starts when the battery is fully
loaded. The charging current is reduced. During
the U1 phase, the battery voltage is kept constant
at a high level. The duration of the U1 phase
depends on the battery type and the depth of dis-
charge.
3: U2 phase (Trickle charging)
The U2 phase serves to maintain the battery capac-
ity (100 %).The U2 phase runs at lowered charging
voltage and variable current. If DC loads are con-
nected, they are powered by the device. Only if
the power required exceeds the capacity of the
device, this surplus power is provided by the bat-
tery. The battery then is discharged until the device
re-enters the I phase and charges the battery.The
U2 phase is limited to between 24 and 48 h
depending on the battery type.

Temperature sensor

With the temperature sensor connected, the
charging booster adjusts the charging voltage (for
lead batteries) or the charging current (for LiFePO4
batteries) according to the measured temperature
at the house battery.
I
NOTE
• For lead batteries: Without tempera-
• For LiFePO4 batteries: Without tem-
The charging characteristics are adjusted as fol-
lows:
• For lead acid batteries see fig. 9, page 6.
• For lead gel batteries see fig. 0, page 6.
• For AGM 1 batteries (14.4 V) see fig. a, page 6.
• For AGM 2 batteries (14.7 V) see fig. b,
page 6.
• For LiFePO4 batteries (13.9 V) see fig. b,
page 6.
• For LiFePO4 batteries (14.2 V) see fig. c,
page 7.
• For LiFePO4 batteries (14.4 V) see fig. d,
page 7.
• For LiFePO4 batteries (14.6 V) see fig. e,
page 7.
Legend
4445103618
ture sensor connected, the charging
voltage is referenced to 20/ 25 °C.
perature sensor connected, the
charging booster does not work.
Charging curve without temperature
sensor connected
Charging curve with temperature sensor
connected
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