Dc Connection; Safety Precautions/Conditions; Cable Protection - SMA Sunny Island 5048 Installation Instructions Manual

Electrical Connection
A grounding conductor of 16 mm² cross-section is thus adequate for short-circuit
currents up to 10000 A.

6.2 DC Connection

6.2.1 Safety Precautions/Conditions

Connect a suitable battery to the DC side (see section 20 "Technical Data" (Page 155)).
DC must be connected observing all valid regulations (e.g. DIN VDE 0510, Rules for
Accumulators and Battery Systems).
All safety and maintenance instructions provided by the battery
manufacturer must be heeded.
Use appropriate (insulated) tools for installation and wiring of the
batteries (danger of short circuits and arcing).
When connecting the battery, ensure that the cable has sufficient cross-
section and that the connections have the correct polarity.
The battery cables should be as short as possible. Long cables and insufficient
cable diameters reduce the system efficiency as well as the overload capabilities.
Do not lay the battery feed cables under plaster or in armored plastic pipes. Large
currents flow through the battery cables so that they can become very warm.

6.2.2 Cable Protection

In addition to the DC circuit breakers within the Sunny Island 5048, install a separate
fuse as close as possible to your batteries. Install a suitable fuse plug for the fuse
according to the maximum specified DC current (e.g. NH1 with 250 A).
Page 36 SI5048-11:EE4206
t = interruption time in seconds
I = maximum battery current (short-circuit current) in
SC
amperes
S = conductor cross-section in mm²
SMA
Technologie AG
Technical Description