Electrical Connection
SMA Solar Technology AG
38
SI5048-TEN093630
Technical Description
6.4 Additional Connections
For installing the connections described below, feed the cables through the specified holes in the
cable insert. Plugs for sealing the RJ45 communication cable for internal and external communication
are provided in the cable insert upon delivery. Combining plugs allows you to establish 0 to 4 feed-
throughs (2 plugs without a feed-through, 1 with 1 feed-through and 2 with 2 feed-throughs). Remove
any of these to connect the communication cable.
6.4.1 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 strongly depends on the temperature. Further
information is provided in section 13.4 ”Charge control” (page 94).
A battery temperature sensor must be connected in order to operate the battery temperature sensors
(included in the delivery). In case of a fault (short circuit, cable break), the Sunny Island operates in
a safe setting, which over time leads to insufficient battery charging. A warning indicating that the
defective battery temperature sensor should be replaced immediately is shown on the display.
NOTICE!
Destruction of the battery and battery temperature sensor.
• Use only the battery temperature sensor included in the delivery.
• Attach the battery temperature sensor externally to one of the battery cells. Choose
a place where the heat generation during operation is the greatest.
Battery temperature sensor in a cluster
A battery temperature sensor is provided with each Sunny Island. Only one battery
temperature is needed for one cluster. It is connected to the corresponding master.
Summary of Contents for SI 5048
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