Dometic BUTTNER MT LB2412-25, Installation And Operating Manual

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Determine the cable cross-section
MT LB 30
MT LB 2412-25
MT LB 2412-45
Connection variant A (fig.
c
, page 7)
Connection variant for motor homes that are to be
equipped with a house battery and charging
device (standard connection variant).
I
➤
Install the charging booster in the connection
between the starting battery and the house bat-
tery.
➤
Disconnect the existing charging cable at a suit-
able point.
➤
To connect the charging booster proceed as
shown in fig.
c
, page 7.
Connection variant B (fig.
d
, page 8)
Connection variant for motor homes with an exist-
ing cutoff relay.
I
➤
Install the charging booster between the exist-
ing cutoff relay ( 2 ) and the house battery.
➤
Disconnect the existing charging cable at a suit-
able point.
➤
To connect the charging booster proceed as
shown in fig.
d
, page 8.
Connection variant C (MT LB 30 only)
(fig.
e
, page 9)
Connection variant for motor homes with existing
central electrical system equipped with integrated
cutoff relay and integrated charger.
I
➤
Install the charging booster in the starting bat-
tery cable between central electrical system ( 2 )
and the starting battery.
Cable
cross-
section
Cable
length
START
(IN) to
starting
battery
Cable
fuse
ΙΙ
Cable
length
BORD
(OUT) to
house
battery
Cable
fuse
Ι
4 mm² – 40 A/
50 A
0.5 m –
1.5 m
30 A/
40 A
6 mm² < 4 m 40 A/
50 A
1.5 m –
3.0 m
30 A/
40 A
10 mm² < 7 m 40 A/
50 A
3 m –
5.5 m
30 A/
40 A
Cable
cross-
section
Cable
length
START
(IN) to
starting
battery
Cable
fuse
ΙΙ
Cable
length
BORD
(OUT) to
house
battery
Cable
fuse
Ι
4 mm² – 30 A 0.5 m –
2.0 m
30 A
6 mm² < 11 m 30 A 1.5 m –
3.5 m
30 A
10 mm² < 18 m 30 A 3.0 m –
6.5 m
30 A
Cable
cross-
section
Cable
length
START
(IN) to
starting
battery
Cable
fuse
ΙΙ
Cable
length
BORD
(OUT) to
house
battery
Cable
fuse
Ι
6 mm² – 40 A 0.5 m –
2.0 m
50 A
10 mm² < 10 m 40 A 1.5 m –
3.5 m
50 A
16 mm² < 16 m 40 A 3.0 m –
5.0 m
50 A
NOTE
The charging booster replaces an exist-
ing cut-off relay. Use connection variant B
if the cut-off relay cannot be removed.
NOTE
The charging booster replaces an exist-
ing cut-off relay. Use connection
variant A if the cut-off relay can be
removed.
NOTE
For LiFePO4 batteries: Disable the inte-
grated charger if it is not equipped with
temperature-controlled charging and
the charging characteristic for LiFePO4
batteries.