Battery Management SMA Solar Technology AG
106 SI5048-TB-TEN110340 Technical Description
13.7 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 Sunny Island master device.
The default value of the parameter "221.06 BatWirRes" is 0 m Ω .
The resistance is made up of the resistance of line 1 + fuse + resistance of line 2:
R = R (line 1) + R (fuse 1) + R (line 2).
The following applies:
ρ = specific resistance for copper
L = length of cable in m
A = cross-section area of the conductor in mm
2
Batfuse
R (resistance 1) at the Batfuse is approx. 1 m Ω .
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