SMA SUNNY ISLAND 6048-US - Battery Lead Resistance

SMA Solar Technology America LLC 13 Battery Management
Operating Manual SI4548-6048-US-BE-en-21 117
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:
ρ = specific resistance for copper
L = Cable length in m (1 m = 3
9
⁄
32
ft)
A = cross-section area of the cable in mm
2
(for conversion of cable sizes
see page 43)
BatFuse
R (fuse 1) at the BatFuse is approx. 1 m Ω .