SMA Sunny Island 2012 Technical Description page 134

Connecting External Sources
GenMan
If a GenMan (generator manager) (SMA order number: "SI-GenMan") is integrated into the system,
it assumes direct control of the generator. It is connected between the Sunny Island and the
generator. The GenMan assumes control of the generator (warm up time, cooling off time and
autostart).
The Sunny Island requests the generator from the GenMan via the GnReq signal and keeps the
signal active as long as the generator is required. The GenMan returns the GENRDY signal via
DigIn when the generator is ready for operation. Then the Sunny Island synchronizes and connects.
If the generator is not needed anymore, the Sunny Island disconnects and deactivates the GnReq
signal.
The following diagram shows the principle of starting the generator via the "GenMan" generator
control:
A manual generator start at the GenMan is notified to the Sunny Island via the GENRDY signal. The
Sunny Island synchronizes and switches on.
If the generator is started manually and externally at the GenMan, the Sunny Island blocks the
GnReq signal:
• Manual stop and start at the Sunny Island (operation via display and keyboard) are ignored.
• Internal requests (e.g., via the battery's state of charge) are ignored as well.
Information
If the generator was started manually at the GenMan, it must also be stopped there.
134 SI2012_2224-TEN082311
SMA Solar Technology AG
Technical Description