Setting The Control Of The Battery Room Fan - SMA SUNNY ISLAND 3.0M Installation Manual

SMA Solar Technology AG
Configuring the resistance of the battery cable
You can optimize the battery management if you set the resistance of the battery cable in expert mode.
Figure 24: Designation of the cable
The resistance of the battery cable is composed of the resistance of cable 1, the BatFuse and the resistance of cable 2.
Requirement:
☐ In a cluster, the communication product or Sunny Remote Control must be connected to the master.
Procedure:
1. Calculate the individual cable resistances. Use the following formula:
R (l,A) = resistance of the cable
Cu
ρ = specific resistance of copper (ρ = 0.018
l = total length of the conductor (outward conductor + return conductor = twice the cable length) in m
A = conductor cross-section in mm²
2. Calculate the total resistance of the battery cable. Use the following formula:
R = R + R
BatRes Cable 1
R = total resistance of the battery cable
BatRes
R = calculated resistance of cable 1
Cable 1
R = calculated resistance of cable 2
Cable 2
R = calculated resistance of BatFuse = 2 m Ω
BatFuse
3. Log in to the communication product as Installer (see the user manual of the communication product) or switch to
expert mode on the Sunny Remote Control (see the Sunny Island operating manual).
4. Select the parameter Cable resistance of the battery connection / 221.06 BatWirRes and set to the resistance
of the battery cable.
8.2.6

Setting the Control of the Battery Room Fan

1. Log in to the communication product as Installer (see the user manual of the communication product) or switch to
expert mode on the Sunny Remote Control (see the Sunny Island operating manual).
Installation manual
Ω mm²
+ R
BatFuse Cable 2
 l
,  
R l A = - - - - - -
Cu
A
⁄ )
m
SI30M-44M-60H-80H-IA-en-32
8 Commissioning
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