Victron energy Buck-Boost DC-DC 25A Manuel page 11

On-board voltage
The on-board voltage under setting 24 of the TSConfig software shall not be set too low. This value may
be adjusted by a qualified electrician only!
Input and output fuse
Use the following input and output fuse and cable intersection depending on the Buck-Boost type:
12 VOLTS INPUT
Buck-Boost type
25A
50A *)
100A *)
12 VOLTS OUTPUT
Buck-Boost type
25A
50A *)
100A *)
24 VOLTS INPUT
Buck-Boost type
25A
50A *)
100A *)
24 VOLTS OUTPUT
Buck-Boost type
25A
50A *)
100A *)
*) CAUTION. In order to use the 50A or 100A, the alternator must have sufficient charging capacity to be able to
supply the maximum input voltage that the converter requires. For details, please see the input voltage (max.) in
the table.
Connection
First connect all GND cables to the converter, the battery and the chassis, and then only the positive (+) cable.
This is important because in the converter everything refers to GND.
When the two plus (+) cables are connected without GND, the potential difference between the plus (+) connections
ensures uncontrolled and unsecured currents!
Always check that the GND connection on the middle M8 connection is correctly connected.
The converter has no reverse polarity protection!
Converter operation
The Buck-Boost DC-DC converter operates on the principle of buck-boost.
This means that the input voltage may be both higher and lower than the set output voltage. The amount
of the charge current remains in both situations always fully under control.
A brief overview of possible conversions:
Buck-Boost type
25A charging current max.
50A charging current max.
100A charging current max.
Fuse value / Ampères
40 Ampère (A)
60 Ampère (A)
125 Ampère (A)
Fuse value / Ampères
40 Ampères (A)
60 Ampères (A)
125 Ampères (A)
Fuse value / Ampères
30 Ampères (A)
40 Ampères (A)
80 Ampères (A)
Fuse value / Ampères
30 Ampère (A)
40 Ampère (A)
80 Ampère (A)
12V – 12V Default
25A
50A
100A
Cable thickness (< 5 metres)
16 mm 2
35 mm 2
50 mm 2
Cable thickness (< 5 metres)
16 mm 2
35 mm 2
50 mm 2
Cable thickness (< 5 metres)
16 mm 2
35 mm 2
50 mm 2
Cable thickness (< 5 metres)
16 mm
2
35 mm 2
50 mm 2
24V – 24V Default
15A
25A
50A
12V – 24V Default
10A
20A
50A
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