SMA SUNNY ISLAND 4548-US Operating Manual page 55

SMA Solar Technology America LLC
Destruction of the battery due to the connection of additional DC devices
If additional DC devices are installed in an off-grid system, the internal Sunny Island current
measurement becomes inaccurate. The charge current can no longer be set exactly and as a result
will destroy the battery.
• Install an external battery current sensor (shunt).
Example:
Connecting the Battery Current Sensor
Use cables of intrinsically safe circuits
Always use cables for intrinsically safe electric circuits for connecting the battery current sensor.
Intrinsically safe means that the cable is double-insulated and that in the event of a short-circuit
the wire melts but the insulation remains intact. In addition, the cable is not combustible. In order
to avoid measuring errors, make sure that the cable conductors are twisted.
Operating Manual
6 Electrical Connection
SI4548-6048-US-BE-en-21 55