SMA America, LLC
Electrical Connection
Technical Description
SI5048U-TUS121440
57
Power Contactor for Load Shedding
The Sunny Island can automatically switch off loads to protect the batteries from deep discharge. To
do this, an external (AC or DC) power contactor must be installed between the Sunny Island and the
loads (see section 12.1 ”Load Shedding” (page 101)).
Installing the Power Supply of a DC Power Contactor for Load Shedding (e.g., relay2):
1. Wire the A1 coil connector of the power contactor to the connection terminal NO (relay2).
2. Wire the connection terminal C (relay2) to the connection terminal Bat.
3. Wire the A2 coil connector of the power contactor to the connection terminal ”BatVtgOut –”.
☑ The control circuit of the power contactor is installed.
Power Supply of the DC Power Contactor
A 48 V voltage is present in the battery‑supplied control circuit.
• Load the BatVtgOut terminals with a maximum 0.75 A.
A2
A1
Load-Shedding
contactor
