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Sunny Island
The battery cables should be as short as possible. Long cables re-
duce efficiency and the tolerable overload and deteriorate the battery
management.
3.4.3 Connection of Battery Temperature Sensor
A PT 100 sensor with four-wire technology is required to measure the battery tem-
perature. The sensor is connected to the inverter at the terminals X1:1-X1:4 (Fig.
3.6).
If the temperature sensor is to be connected with a shielded cable, connect the
shielding to terminal X1:5. This terminal is connected to the case and thus to the PE
connections of the inverter. Therefore make absolutely sure to avoid creating any
electric bond by attaching the temperature sensor to the battery.
To protect the battery always connect a battery temperature sensor
(the Sunny Island displays a failure if no sensor is installed).
In a three-phase island system only the master Sunny Island needs
to be equipped with a battery temperature sensor.
BWRI33-12:EE
Battery
temperature
Sunny Island
Fig. 3.6: Connection of a temperature sensor
Installation & Operating Instructions
X1:
1
2
PT 100
3
4
5
- 28 -
SMA Regelsysteme GmbH
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