Electrical Connection
SMA America, LLC
50
SI5048U-TUS121440
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 rubber terminal block upon delivery. Combining plugs allows you to establish up
to 4 cable entries (2 plugs without entry, 1 with 1 entry and 2 with 2 entries). Use the plugs with entries
as needed to connect the communication cables.
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 107).
A battery temperature sensor (included in the delivery) must be connected in order to operate the
Sunny Island. In case of a fault (short-circuit, cable break), the Sunny Island operates in a safe setting,
which over time, however, leads to insufficient battery charging. A warning indicating that the
defective battery temperature sensor should be replaced immediately is displayed.
