Additional Connections; Battery Temperature Sensor - SMA Sunny Island 2012 Technical Description

SMA Solar Technology AG

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.
Technical Description
Sunny Island Electrical Connection
SI2012_2224-TEN082311 59