SMA Solar Technology AG Electrical Connection
Technical Description SI5048-TEN093630 41
Connecting the Battery Current Sensor:
1. Poke through the appropriate place in the cable insert with a pointed object.
2. Starting from the outside, feed the cable with cable end sleeves 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)
Commissioning the battery current sensor
When connecting a battery current sensor to the Sunny Island the device's internal offset
must be adjusted during the first commissioning of the off-grid system. To do this, proceed
as described in section 8.3”Commissioning the battery current sensor” (page58).
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