SMA WB 3600TL - Manual (Page 26)

Electrical Connection SMA Solar Technology AG
26 WB36TL_50TL-IEN102011 Installation Guide
5.3 Connection to the Power Distribution Grid (AC)
5.3.1 Conditions for the AC Connection
Observe all connection conditions of the utility operator for connecting to the power distribution grid!
Residual current breaker
The inverter is equipped with an integrated universal current sensitive residual-current monitoring unit.
The inverter can automatically differ between real fault currents and "normal" capacitive leakage
currents.
If an external RCD or residual current breaker is strictly required, you must use a switch that triggers
at a failure current of 100 mA or higher.
Cable Sizing
The grid impedance of the AC cable must not exceed 1 Ohm. Otherwise, the inverter will disconnect
at full feed capacity due to excessive voltage at the feed-in point.
The wire cross-section should be dimensioned so output losses do not exceed 1 % at nominal power.
The maximum cable lengths depending on the wire diameter are displayed in the following table.
The conductor cross-sectional area required in individual cases depends on the following factors,
among others:
• Ambient temperature,
• Routing method,
• UV resistance,
• Conduction losses,
• valid installation requirements of the respective country (installation location).
Cross section of insulated
conductor Maximum wire length
WB 3600TL WB 5000TL
6.0 mm² 23.3 m 18.6 m
10.0 mm² 38.8 m 31.1 m