SMA America, LLC 13 Battery Management
Technical description SI4548_6048-US-TB_en-13 115
13.6 Battery Diagnosis
The "320# Battery Diagnosis" menu displays several values that provide information on the past
operational behavior of the battery. These values are helpful in checking the efficiency of the set
parameters and in viewing the typical operating conditions of the battery (see Section 19.3
"Diagnosis (300#)", page 193).
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 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 = 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 41)
BatFuse
R (fuse 1) at the BatFuse is approx. 1 m Ω .
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