Installation Instructions

Electrical Connection SMA Solar Technology AG
18 SB11_12_17-IEN100132 Installation Guide
Load Disconnection Unit
You must install a separate line circuit breaker for each inverter in order to ensure that the inverter
can be securely disconnected under load. The maximal permissible rating is located in
section 11 "Technical Data" (page42)
Detailed information and examples for the design of a line circuit breaker can be found in the
Technical Information "Line Circuit Breaker" in the download area of www.SMA.de/en.
DANGER!
Danger to life due to fire!
When more than one inverter is connected to the same line circuit breaker, the protective
function of the line circuit breaker is no longer guaranteed. It can result in a cable fire or
the destruction of the inverter.
• Never connect several inverters to a single line circuit breaker.
• Comply with the maximum permissible fuse protection of the inverter when selecting
the line circuit breaker.
NOTICE!
Damaging of the Sunny Boy by using screw type fuse elements as load
disconnection unit!
A screw type fuse element, e.g. D system (Diazed) or D0 system (Neozed) is not a circuit
breaker, and may not be used as a load disconnection unit. A screw type fuse element is
only used as cable protection.
When disconnecting under load using a screw type fuse element, the Sunny Boy can be
damaged.
• Use only a load disconnecting switch or a line circuit breaker as load disconnecting
unit.
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.