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Grid
SMA Solar Technology AG
122
SBU2200-TEN083320
Technical Description
15.5 Grid Reconnection
In stand-alone operation, the Sunny Backup 2200 constantly checks whether the grid has been
reconnected (see above). If the voltage and frequency of the main power grid are within the
permissible range of parameters "232.01 GdVtgMin" and "232.02 GdVtgMax" for time
"232.07 GdVldTm" and the frequency is within the permissible range of parameters
"232.05 GdFrqMin" and "232.06 GdFrqMax" (see section 15.1 „Conditions“ (120)), the stand-
alone grid is synchronized with the main power grid and then connected.
If the battery is fully charged, the frequency limits the power output of the AC feed-in generators
(Sunny Boy) in the stand-alone grid. If the grid is now reconnected, the frequency would be lowered
if necessary in the course of synchronizing the Sunny Backup 2200 with the grid. 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 during such conditions, the stand-alone grid frequency is temporarily
increased ("231.04 AcSrcFrqDel" parameter), in line with the synchronization, until the AC feed-in
generators (Sunny Boy) are disconnected from the stand-alone grid as a result of the grid limits being
exceeded.
15.6 Limits and Power Adjustment
The Sunny Backup 2200 loads the public grid with the current specified in the "232.03 GdCurNom"
parameter. The power that is not directly used by the loads flows into the battery for charging. The
limits for the AC charging current limit ("210.02 InvChrgCurMax" parameter) on the Sunny Backup
2200 and the DC charging current limit ("222.01 BatChrgCurMax" parameter) are active at the
same time. If the battery voltage reaches the charging voltage nominal value, it is also reduced (see
section 16.4 „Charge Control“ (125)). If the current set using the "232.03 GdCurNom" parameter
is not sufficient for powering the loads, the battery provides support.
Grid limits in stand-alone grid operation
The thresholds are cutoff limits; due to internal hysteresis, the reconnection limits are set
somewhat more narrowly.