Learn about the Solis NO-GRID error, its causes, and solutions after a transformer tap change.
The NO-GRID error indicates that the inverter is not detecting a utility grid connection, which can occur after changes in the grid configuration.
To troubleshoot, check the inverter's connection to the grid, inspect the transformer tap settings, and ensure proper voltage levels are maintained.
The NO-GRID fault is triggered when the inverter detects that the utility grid voltage is outside acceptable limits or when it cannot communicate with the grid. This can occur due to transformer tap changes, which adjust the voltage levels to stabilize the grid. The inverter relies on specific grid frequency and voltage parameters to function correctly. If these parameters fluctuate beyond the inverter's programmed thresholds, it will automatically shut down to protect both the inverter and the system components. Ground fault detection may also engage if the system's impedance changes, indicating potential insulation or wiring issues.
Upon experiencing a NO-GRID error, users may observe a steady red LED indicator on the inverter, indicating an operational fault. The monitoring app may display alerts indicating a loss of grid connection, accompanied by a significant drop in energy production, often showing zero output despite sunlight conditions.
To mitigate the risk of encountering a NO-GRID error in the future, ensure regular maintenance of the solar system, including periodic inspections of all electrical connections and components. Stay informed about utility grid changes, especially if your area undergoes transformer tap adjustments. Additionally, keep the inverter firmware updated to align with any new grid standards.