Battery Lead Resistance - SMA SUNNY ISLAND 4548-US Operating Manual

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13.8 Battery Lead Resistance

In menu "221# Battery Property", you can specify the battery lead resistance (BatWirRes). The
resistance is the ohmic resistance from the battery to the input of the master device. The default value
of the parameter "221.06 BatWirRes" is 0 m Ω .
The resistance is made up of the resistance of cable 1 and fuse and resistance of cable 2:
R = R (cable 1) + R (fuse 1) + R (cable 2)
The following applies:
BatFuse
R (fuse 1) at the BatFuse is approx. 1 m Ω .
Operating Manual
ρ = specific resistance for copper
L = Cable length in m (1 m = 3
A = cross-section area of the cable in mm
see page 43)
9
⁄ ft)
32
2
(for conversion of cable sizes
SI4548-6048-US-BE-en-21
13 Battery Management
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