SMA SI 5048, Technical Description

Page: 101 / 212

SMA Solar Technology AG Battery management
Technical Description SI5048-TEN093630 101
13.7 Battery Lead Resistance
In menu "221# Battery Property" you can specify the battery lead resistance (BatWirRes). The
resistance is the ohmic resistance of the battery up to the input of the Sunny Island master. The default
value of the parameter "221.06 BatWirRes" is 0 m Ω .
The resistance is made up of the resistance of cable 1 + fuse + resistance of cable 2:
R = R (cable 1) + R (fuse 1) + R (cable 2).
The following applies:
ρ = specific resistance for copper
L = length of cable in m
A = cross section of the cable in mm
2
BatFuse
R (resistance 1) in the BatFuse is about 1 m Ω .