SMA Solar Technology AG
Electrical Connection
Installation Guide
SB3300TLHC-IEN094121
17
5.2 Low Voltage Grid (AC)
Load Disconnection Unit
The maximal permissible rating is located in the technical data (page 36).
The relevant technical regulations and the special instructions of the local grid operator must be
followed.
The connection terminals of the Sunny Boy are suitable
for wire cross-sections of up to 10 mm². The external
diameter of the cable must be between 9mm and 17mm.
The connection is made with three wires (L, N, PE).
The Sunny Boy is equipped with an integrated universal current sensitive leakage-current monitoring
unit. The Sunny Boy can automatically differ between real fault currents and "normal" capacitive
leakage currents.
The Sunny Boy does not generate any extraordinary leakage currents in normal operation. In certain
operating states (e.g. during self-test of the protective equipment), leakage currents may occur which
can trigger a "normal" 30 mA RCD or FI circuit breaker.
DANGER!
Danger to life due to fire!
When a generator (Sunny Boy) and a consumer are connected to the same line circuit
breaker, the protective function of the line circuit breaker is no longer guaranteed. The
current from the Sunny Boy and the grid can add up to overcurrent which is not detected
by the line circuit breaker.
• Never connect loads between the Sunny
Boy and the line circuit breaker without
protection.
• Always install separate fuses for loads.
Examples for the rating of a line circuit breaker can be found in the Technical Information
"line circuit breaker" in the download area of www.SMA.de/en.
A 30 mA RCD or FI circuit breaker must not be installed.
In the event that an RCD or FI circuit breaker is necessary or mandatory, you must use a
circuit breaker with a tripping characteristic of 100 mA or more.
