SMA Solar Technology AG
Connecting External Sources
Technical Description
SI5048-TEN093630
119
14.2.5 Grid operation
In grid operation, the stand-alone grid and main power grid are connected. The Sunny Island is
connected along with the stand-alone grid to the main power grid. In this case, the voltage and
frequency in both grids are identical.
In grid operation, the grid monitoring checks whether the permissible limits for voltage and frequency
(see Grid Reconnection) are maintained or whether the grid fails to assume powering the stand-alone
grid. To do this, the main power grid is disconnected (grid backup operation).
The battery is generally charged or its charge is maintained on the grid.
Charge Mode
Charge mode on the grid is indicated by energy flowing to the battery. The battery is charged until
the respective charge process (Boost, Full, Equalize) has been completed and the system transitions
into float charge (Float) (see section 13.4 ”Charge control” (page 94)).
Silent Mode
In order to save energy, the silent mode can be activated using the "224.01 SilentEna" parameter set
to "enable" (default disable). In this case, the Sunny Island is set to standby mode if the charge has
been completed and the battery has been in float charge for some time (see section 13.4.5 ”Silent
Mode” (page 98)).
The silent mode is exited regularly to recharge the battery.
Feeding Operation
Whether energy is fed from the stand-alone grid into the main power grid is controlled using the
"232.08 GdMod" parameter.
In any case, talk to your utility operator to find out whether it is possible to feed into the grid!
If GridCharge (Default) is set, no energy is fed into the grid. If GridFeed is set, energy is fed into the
grid.
AC feed-in generators on the stand-alone grid side (Sunny Boy) can feed their energy into the grid
through the internal transfer relay of the Sunny Island; for limitations, see section 14.1.6 ”Limits and
Power Adjustment” (page 113).
Grid Failures
All grid failures that occur during grid operation affect the stand-alone grid.
Feeding in from the DC side into the grid
In order to allow electricity to be fed from the DC side into the grid, the battery voltage in
a charged battery (on the grid) must be increased by external DC chargers or the
Sunny Island Charger above the nominal charging voltage.
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