SMA America, LLC
Connecting External Sources
Technical Description
SI5048U-TUS121440
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• Remaining stop time after the shut-off delay time has expired (Lock)
• Remaining time in the error state (Fail)
• Remaining time in the locked error state (FailLock)
14.1.8 Operation in Conjunction with PV Inverters
If the battery is fully charged, the frequency limits the power output of the AC feed-in generators
(Sunny Boy). If the generator is now manually started, for example, the frequency would be lowered,
if required, as the Sunny Island synchronizes with the generator. The AC feed-in generators (Sunny
Boy) would then feed additional energy into the system and possibly overload the batteries. In order
to prevent this, in this case the off-grid frequency is temporarily increased, in line with the
synchronization, until the AC feed-in generators (Sunny Boy) are disconnected from the off-grid power
system as a result of the grid limits being exceeded.
14.1.9 Stopping the Generator
If the generator was started via the Sunny Island (automatically or manually), it can be manually
stopped at any time using the ”540.01 GnManStr” parameter. This disconnects the generator (the
minimum run time is not taken into account here) and the shut-off delay time (Cool) is skipped.
Afterwards, the system enters the stop time (Lock).
NOTICE
Wrong system design may lead to exceeding the maximum AC power of the PV inverters.
Damage to the Sunny Island.
• The maximum AC output power of the PV inverters connected should not exceed
10 kW per Sunny Island.
• Observe the following:
P
AC max
of the PV inverter = 2 x P
AC nom
of the Sunny Island
DANGER
Electric shock through residual voltage in the off‑grid system due to generator shut‑off
delays. Death or serious injuries.
The shut-off delay time depends on the generator type. During the shut-off delay time, there
is still grid voltage at the loads.
• Wait until the generator does no longer deliver any voltage.
• Measure voltage to ensure that none is present in the system.
