SMA Sunny Island 4548-US, Technical Description

Page: 53 / 240

SMA America, LLC 6 Electrical Connection
Technical description SI4548_6048-US-TB_en-13 53
Connecting the Battery Current Sensor
1. Pierce a hole at a suitable location in the cable support sleeve using a sharp object.
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 terminal included
in the delivery.
4. Tighten the terminals (torque: 5 in-lbs. to 7 in-lbs. (0.56 Nm to 0.79 Nm)).
5. Insert the 4-pole terminal into the "BatCur" pin connector on the Sunny Island.
☑ The battery current sensor is installed.
Use cables of intrinsically safe electric circuits
Always use lines for intrinsically safe electric circuits for connecting the battery current sensor.
Intrinsically safe means that the line is double-insulated and that in the event of a short-circuit
the wire melts but the insulation remains intact. 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 battery current sensor contact that is connected to the Sunny Island (1), must be connected
to the terminal "" (see following figure).
• Positive battery current means that the battery is being discharged (current from the
battery).
• Negative battery current means that the battery is being charged (current into the
battery).
Commissioning the battery current sensor
When connecting a battery current sensor to the Sunny Island, you must set the device-internal
offset during the initial start-up of the off-grid system on the Sunny Island as described
(see Section 8.3 "Commissioning the Battery Current Sensor", page 71).