6 Electrical Connection SMA America, LLC
52 SI4548_6048-US-TB_en-13 Technical description
6.4.2 Battery Current Sensor
In addition to the internal measurement, the Sunny Island provides the possibility to measure the
battery current via a shunt. You need this function if you intend to operate additional DC generators
and DC loads in your off-grid system. Only one battery current sensor is necessary in a cluster; this is
to be connected to the cluster master.
Example:
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).
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