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Diagnostics case :

Event number 1, 101, 102, 103 Grid fault

Event numbers 1, 101, 102, 103 Grid incident

Event number 1 and the 3-digit event numbers 101, 102 and 103 indicate that the grid voltage or grid impedance at the connection point of the inverter is too high. The inverter disconnects from the utility grid to maintain power quality. As soon as the grid voltage is in the permissible range again, the inverter automatically switches itself on again after the grid monitoring time specified in the country standard.

Detailed background information about possible reasons for feed-in interruptions due to grid incidents can be found in the diagnosis Background information for grid incidents

Corrective measures for system operators:

  • Read out the current grid voltage via communication (e.g. Sunny Explorer).
  • Note the time at which the disturbance occurs
  • If the error occurs repeatedly, contact your installer. The subsequent steps require the specialist knowledge of an electrically qualified person or installer.


Corrective measures for installers:

  • Read out values:
    Read out the current grid voltage, set limit values and past events via communication (e.g. Sunny Explorer).



DANGER! The tasks described below may only be performed by electrically qualified persons:

  • Measure the grid voltage at the inverter’s terminals: 
    Compare the measured voltage to the grid voltage value set in the inverter.
    If the error only occurs sporadically, e.g. in the afternoon, please try to measure the grid voltage at that time.
    Note: The current grid voltage on the inverter falls immediately after the feed-in has been interrupted. The peak values that had triggered the grid incident can therefore normally not be measured.
  • Check the complete AC cabling from the inverter up to the feed-in meter:
    - Look out for loose terminals
    - Check that the cable is seated correctly on the AC terminal or AC connector
    - Check fuses
    - Take the link between line length and line cross-section depending on the AC power into consideration
  • Contact the grid operator
    If the grid voltage exceeds the set limit value due to the local grid conditions, contact the grid operator. The grid operator will then decide whether to conduct measures to improve the situation or grant permission to change the inverter’s operating parameters. The procedure for changing the operator parameters is described in the inverter operating and installation manual.

See the inverter operating and installation manual for additional information about connection to the utility grid.

How to read out the grid voltage measured by the inverter and the grid voltage limit value set in the inverter via communication:

WebGui and Sunny Explorer / Sunny WebBox Bluetooth / SMA Cluster Controller after the inverter has been selected in the system tree:

Grid voltage: Spot values / AC side / Phase voltage

Set limit value U>>: Settings / Grid monitoring / Voltage monitoring / Lower maximum threshold

Sunny WebBox (485) after the inverter has been selected in the system tree:

Grid voltage value: Spot values / GridMs.PhV.phsA (B/C)

Set limit value U>>: Parameters / VolCtl.hLim

Note: The grid voltage on the inverter falls immediately after the feed-in has been interrupted (see voltage drop). It will therefore rarely be possible to read out a grid voltage above the set limit values. The difference in grid voltage before and after the feed-in interruption depends on the power that was previously fed in, the characteristics of the utility grid, and line cross-section and the transition resistances of the AC installation.

All work on the inverter and the cabling of the PV array must be carried out by an electrically qualified person. SMA accepts no liability for the information and solutions given in the Online Service Center. Additional information can be found in our Online Service Center’s terms and conditions of use.


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