Mastervolt Chargemaster 12/100-3, User Manual, Page: 13 / 34

INSTALLATION
14
4.3.2 DC wiring
Keep in mind that high current will pass through the DC
wiring. Keep the cable length as short as possible, this will
keep the system efficiency as high as possible. The
recommended minimum cross section of the battery
cables is:
•
Main charge output (output 1)
DC Cable cross section: Model
Chargemaster <3m / 10ft
3-5m / 10ft
12/70-3 25mm² / AWG3 35mm² / AWG2
12/100-3 35mm² / AWG2 50mm² / AWG0
24/40-3 16mm² / AWG5 25mm² / AWG3
24/60-3 25mm² / AWG3 35mm² / AWG2
24/80-3 35mm² / AWG2 50mm² / AWG0
24/100-3 35mm² / AWG2 50mm² / AWG0
•
Charge output (output 2 and 3)
DC Cable cross section: Model
Chargemaster <3m / 10ft
3-5m / 10ft
All models 4mm² / AWG11 6mm² / AWG9
Use ring terminals on the ends of the wires. The terminals
must be crimped with a proper crimping tool. Use the
following wire colours for DC wiring colour or at least
different colours to make a clear distinction between the
positive and negative wire from the battery:
Wire color Meaning
Must be
connected to:
Red Positive + (POS)
Black Negative – (NEG)
Lay the positive and negative cables next to each other to
limit the electro magnetic field around the cables. The
negative cable should be connected directly to the
negative post of the battery bank or the ground side of a
current shunt. Do not use the chassis frame as the
negative conductor. Tighten securely. The positive battery
cable must be fused and connected to the positive post of
the battery bank.
• Main charge output (output 1)
Model Chargemaster Recommended charger fuse
12/70-3 80A
12/100-3 125A
24/40-3 50A
24/60-3 80A
24/80-3 100A
24/100-3 125A
• Charge output (output 2 and 3)
Model Chargemaster Recommended charger fuse
All models 16A
The fuse with the fuse-holder is available from your local
Mastervolt distributor or Customer Service Representative.
4.3.3 Battery capacity
The minimum required battery capacity is as follows:
Model Chargemaster Minimum required battery
capacity
12/70-3 140Ah
12/100-3 200Ah
24/40-3 80Ah
24/60-3 120Ah
24/80-3 160Ah
24/100-3 200Ah
4.3.4 AC safety grounding
WARNING!
The ground wire offers protection only if the
cabinet of the Chargemaster is connected to
the safety ground. Connect the ground
terminal (PE / GND) to the hull or the chassis.
CAUTION!
For safe installation it is necessary to Insert a
Residual Current Device (earth leakage
switch) in the AC input circuit of the
Chargemaster.