Setting of cable (wire) resistance
2280073 Rev.1 Page 18
Setting of cable (wire) resistance
The new software version of the MC1500 includes a cable (resistance) compensation to
compensate for voltage drop at the connecting cables of the battery.
4.1 Standard battery-connecting cables
In the delivery condition, a cable resistance of 15 mΩ is preset. This applies for a
5 meter/16 mm² battery connecting cable. If a different cable length or a different conductor
cross-section is used, the cable resistance has to be adjusted in the service menu
(see section 10.7).
Cable-resistance values of the battery’s standard connecting cable:
Cable length/conductor cross-section: cable resistance:
5m/16mm² 15mΩ
7m/16mm² 20mΩ
4.2 Calculation of cable resistance
The cable resistance is calculated according to the following equation:
cable resistance =
2 ∗ 𝑙
ĸ ∗ 𝐴
+ 𝑅_transfer
Example of a 5m battery connecting cable:
Cable length (𝑙): 5m
Electrical conductivity of copper (ĸ): 56m/(Ωmm²)
Conductor cross-section (𝐴): 16mm²
Transfer (contact) resistance = 𝑅_transfer: 4mΩ (transfer resistance of clamps and screw
connections)
Calculation of cable resistance ((2 5) / (56 16)) 0.004
0.01516Ω
15mΩ
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