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Electrical Connection SMA Solar Technology AG

18 SB25_30-IEN092520 Installation Guide

Load Disconnection Unit

You must install a separate fuse 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 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.

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.

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