Electrical Connection SMA Solar Technology AG
42 SI5048-TB-TEN110340 Technical Description
Connecting the Battery Current Sensor:
1. Pierce a hole in the rubber connection area at the corresponding position.
2. Starting from the outside, lead the insulated conductors with bootlace ferrules through the hole
in the Sunny Island.
3. Connect the cables correspondingly to the "BatCur" connection of the 4-pole print terminal
included in the delivery.
4. Tighten the terminals.
5. Insert the 4-pole print terminal into the "BatCur" socket on the Sunny Island.
☑ The battery current sensor is installed.
Use cables of intrinsically safe circuits
Always use cables of intrinsically safe circuits for the connection of battery current sensors.
"Intrinsically safe" means here that the cable is double-insulated and that the wire melts but
the insulation remains intact in the event of a short circuit. In addition, the cable is not
combustible. In order to avoid measuring errors, make sure to use twisted cables.
Installation notice
The battery current sensor must be looped around the negative pole of the battery. In
addition, the contact of that battery current sensor, which is connected to the Sunny Island
(1), must be connected to the terminal "BatCur+" (see following figure).
• Positive battery current means that the battery is discharging (current from the
battery)
• Negative battery current means that the battery is charging (current into the battery)
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