Electrical Connection SMA Solar Technology AG
46 SI5048-TEN093630 Technical Description
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 also section 21”Accessories” (page204)).
Installation of the load shedding system is strongly recommended in systems with extensive AC-side
coupling of solar power or wind power. This is the only way to achieve safe operation of the system,
even in cases of low energy generation or very high consumption. Disconnect only the loads, never
disconnect the generators (e.g., PV inverters)!
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 connection terminal C (relay2) to the connection terminal "BatVtgOut +".
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.
The voltage can handle loads up to a maximum of 600 mA.
To Next Page
Loading...
