SMA SC 500HE-US Installation - Manual (Page 50)

8 Electrical Connection SMA America, LLC
50 SC500HEUS-IA-US_en-14 Installation Manual
8.2.3 Requirements
Cable Requirements
Grid
For connecting the external voltage, a 208 V grid is required at the installation site.
8.2.4 Optional External 3-phase voltage supply
(3AC, 208/120V, 60Hz)
It is possible to connect the Sunny Central to an external 208 V voltage supply. The Sunny Central
consumes up to 1,700 W in operation. It draws the energy from the PV field. At installation sites,
where the feed-in tariff per kWh does apply, it may be useful to connect the Sunny Central to an
external voltage supply. The Sunny Central then draws the electricity for its internal power supply from
the grid via the external voltage supply.
8.2.5 Connecting the external 208 V power supply
1. Insert the cable through a separate cable duct into the Sunny Central (see section 6).
2. Loosen the 4 screws on top of the gasket plate in
the base of the Control Cabinet in a
counterclockwise direction and remove them.
Cable Size Cable
12 AWG (4 mm
2
) minimum 140°F (60°C) minimum, copper wire
14 AWG (4 mm
2
) minimum 194°F (90°C) minimum, copper wire
Fuses between external power supply and Sunny Central
The installer is responsible for installing the fuses between the external power supply and the
Sunny Central. The Sunny Central has an internal fuse of 16 A.
/05*$&
Details for auxiliary power connection are shown in the circuit diagrams attached to the
Sunny Central.