SMA Solar Technology AG Electrical Connection
Technical Description SI5048-TB-TEN110340 47
Power Contactor for Load Shedding
The Sunny Island can automatically disconnect 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 also section 12.1”Load Shedding” (page92)).
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 terminal C (Relay2) to the terminal "BatVtgOut +".
3. Wire the A2 coil connector of the power contactor to the 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. The voltage can handle
loads up to a maximum of 600 mA.
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