SMA SUNNY ISLAND 5048-US, Техническое описание

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SMA America, LLC Battery Management
Technical Description SI5048U-TUS121440 113
13.6 Battery Diagnostics
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 183)).
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 (
1 m = 3
9
⁄
32
ft. )
A = cross-section 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 .