SMA Solar Technology AG Sunny Island Electrical Connection
Technical Description SI2012_2224-TEN082311 59
7.6 Additional Connections
7.6.1 Battery Temperature Sensor
The battery temperature sensor measures the temperature of the connected battery. This is necessary
since the optimum charging voltage for a battery largely depends on the temperature. Further
information is provided in section 12.4 "Charge Control" (Page 122). A battery temperature sensor
is provided with the Sunny Island (see the delivery scope description).
Defective Battery Temperature Sensor
If the battery temperature sensor is rendered inoperative, e.g., due to a short circuit or
broken cable, the Sunny Island works with a fixed setting which, however, leads to an
insufficient charge of the battery in the long run. In this case the Sunny Island's display
shows a warning.
• Replace the defective battery temperature sensor promptly.
• Always operate the Sunny Island with the battery temperature sensor (included in
the delivery).
NOTICE!
Damage to the battery due to faulty installation
• Always install the battery temperature sensor included in the delivery.
• Do not drill holes into the battery when installing the battery temperature sensor.
- Fasten the battery temperature sensor to the outside of one of the battery cells.
- Choose a position in the space between two cells or in the middle area of the
battery bank, where the heat generation during operation is greatest.
One battery temperature sensor per cluster!
A battery temperature sensor is provided with each Sunny Island.
Only one battery temperature sensor, which is connected to the corresponding master, is
required for a cluster.
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