Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 146 -
SMA Regelsysteme GmbH
Even in island grids with feeders independent of weather conditions we
recommend to wire up the consumers in a way to be able to switch them
off with the Sunny Island (via one of the relays K1 to K8). Especially in
case of a failure (generator defective etc.) the battery can thus be pro-
tected against harmful conditions and emergency operation can be made
as efficient as possible.
Emergency operation
In case of a flat battery in a purely PV-supplied island grid (when the battery state
reaches one state below the one that was defined in parameter “535_State StopT”)
the Sunny Island has an operating mode allowing to make the AC grid available to
feeders nonetheless. In this mode the inverter generates the grid voltage for a few
minutes every four hours over the day and detects whether there is enough feeding
power to charge the battery. This is an effective way to avoid a long-term total shut-
down of the system even under the worst conditions. This feature is only active if the
parameter “310_Auto Start” is not set to zero.
Please refer to Chapter 2.2 for details.