Electrical Connection
SMA
Technologie AG
28
SB40TL_50TL-IEN081211
Installation Guide
6.2 Connection to the Public Grid (AC)
Connection requirements
•
Comply with the connection regulations of your utility operator.
•
Ensure that the Sunny Boy is configured correctly for your country as described in section 6.4
„Setting the installation country” (Page 37).
Residual current breaker
The Sunny Boy is equipped with an integrated all-pole sensitive, leakage-current monitoring unit.
This enables the Sunny Boy to automatically differentiate between real leakage currents and
"normal" capacitative leakage currents.
If an external RCD or residual current breaker is mandatory, you must use a circuit breaker which
is triggered at a leakage current of 100 mA or more.
Wire design
AC grid impedance should not exceed 1 Ohm. Otherwise the Sunny Boy will deactivate at full feed-
in power due to excessive voltage at the grid connection point.
The cable cross-section should be sized using the "Sunny Design" design program (
such that output losses do not exceed 1 % at the nominal power.
The maximum line length for each cable cross section is shown in the following table. Do not exceed
the maximum line length.
Load disconnection unit
Use only line circuit breakers as load disconnection units!
A screw type fuse element, e.g. D system (Diazed) or D0 system (Neozed) is not a load
disconnection device, and thus may
not
be used as a load disconnection unit.
Upon disconnection under load, the screw type fuse element may be destroyed, or its functionality
may be inhibited by contact burning. It only acts as cable protection.
Cable cross-section
Max. cable length
SB 4000TL-20
SB 5000TL-20
6.0 mm²
23.3 m
18.6 m
8.0 mm²
31.1 m
24.8 m
10.0 mm²
38.8 m
31.1 m
Summary of Contents for SUNNY BOY 4000TL
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