10 External Energy Sources in the Off-Grid System SMA Solar Technology AG
140 SI80H-60H-OffGrid-IA-en-11 Installation Manual
10.10 Grid Management
10.10.1 Tasks of Grid Management
Grid management performs the following tasks:
• Grid management detects failures, disturbances and the return to the electricity grid.
• Grid management controls the transition from stand-alone grid operation to grid operation.
• Grid management controls the transition from grid operation to stand-alone grid operation.
• If the electricity grid is acting as an energy reserve, grid management automatically connects
the electricity grid when required.
10.10.2 Electrical Limiting Values for the Electricity Grid
When the electricity grid breaches the electrical limiting values, grid management detects failures,
disturbances or overload of the electricity grid.
Configurable limit Explanation
Maximum line current Grid management limits the supply of current from the electricity
grid to a configurable maximum value.
Frequency of voltage on the
electricity grid
You can adjust the limiting values for the frequency and value of
the voltage to the applicable local standards and requirements.
The frequency and value of the voltage on the electricity grid
directly affect the power quality in the stand-alone grid. When the
electricity grid breaches the limiting values, the off-grid inverter
disconnects the electricity grid from the stand-alone grid and
switches to stand-alone grid operation.
Value of voltage of the
electricity grid
Maximum reverse power to the
electricity grid
In case of reverse power, the off-grid system feeds power into the
electricity grid. Reverse power may be fed into the electricity grid
during operation with AC sources in the stand-alone grid. You can
set the active power and the permitted time for reverse power.
If the limiting values are breached, grid management disconnects
the electricity grid from the stand-alone grid.
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