Export limitation control uses a site meter to hold the power fed to the grid at a set point just below an export limit. This fault means the control is not holding that limit. Typical signs are a plant that runs at full power and exports to the grid, a red status bar above the export limit, or meter readings that look far too low or too high. A feed-in meter that reports zero watts for a long time may be faulty, and in that case limitation cannot work. Common causes are wrong CT or VT settings on the meter, a meter installed away from the point of connection, a reference system that does not match the generator reference, or the export limitation flag left off. To confirm, use the control status page to check exported, generated and consumed power and the state flags of each inverter. Then review the meter and limitation settings. Fix the meter ratios and reference system, enable and save the limitation, and set up a fallback plan so the inverters hold a safe output if the meter link is lost.
<!-- review notes
presents_asc1 verified · fact Feed-in above export limit
Plant stays at full power and exports to the grid, or the monitoring status bar turns red above the export limit. A brief red bar after a sudden load increase is normal.
sec=h60 h=23ee56cf49ecsec=h57 h=d6e8f90be636verified by: review-workflowverified on: 2026-10-24
c2 drafted · lead Continuous zero feed-in reading proposed
The S0 feed-in meter reports 0 W for 24 hours, and power limitation cannot work if the meter is faulty.
sec=h475 h=b26580197ffcc3 drafted · lead Unrealistic meter values proposed
Point of connection measurements on the control status page are very low or very high.
sec=h63 h=bac2703ea970c4 drafted · lead Fallback operation after loss of control or meter signal
Each inverter holds its output at the fallback set point after the meter link is lost or the limit cannot be reached. A red status bar is one trigger.
sec=h35 h=a2fa68991134sec=h57 h=d6e8f90be636caused_byc5 verified · fact Meter CT ratio misconfiguration
If the CT or VT settings are wrong, the meter does not read the real power flowing to the grid.
sec=h60 h=23ee56cf49ecsec=h63 h=bac2703ea970sec=h38 h=8034e54fab20verified by: review-workflowverified on: 2026-10-24
c6 drafted · lead Energy meter installation position error
The meter must sit at the point of connection. Installing it anywhere else causes control failures.
sec=h38 h=8034e54fab20c7 drafted · lead Energy meter measurement or communication failure
A faulty feed-in meter, or lost communication with the meter, stops normal limitation.
sec=h475 h=b26580197ffcsec=h35 h=a2fa68991134c8 drafted · lead Meter configuration error proposed
The meter's reference system does not match the generator reference system, or generation mode is not enabled on an M2M meter.
sec=h60 h=23ee56cf49ecsec=h53 h=21c81091eb99c9 drafted · lead Inverter parameter settings
The export limitation flag is not switched on, or the configuration was not saved and applied.
sec=h60 h=23ee56cf49ecsec=h53 h=21c81091eb99affectsc10 verified · fact Energy meter
sec=h475 h=b26580197ffcsec=h38 h=8034e54fab20verified by: review-workflowverified on: 2026-10-24
sec=h57 h=d6e8f90be636sec=h35 h=a2fa68991134detected_byc12 drafted · lead Export control status monitoring proposed
Compare exported, generated and consumed power. Check the colored status bar and each inverter's state flags and derating set point.
sec=h57 h=d6e8f90be636c13 drafted · lead Inverter settings review
Confirm the export limitation flag, the meter CT/VT settings and the reference system.
sec=h60 h=23ee56cf49ecreview note: support check: partial - u11 says to check CT/VT, reference system and export flag, but doesn't call it an inverter settings review method.
mitigated_byc14 drafted · lead Meter configuration correction proposed
Set the correct CT and VT ratios, align the reference system, and enable generation mode on M2M meters.
sec=h60 h=23ee56cf49ecsec=h63 h=bac2703ea970sec=h38 h=8034e54fab20c15 drafted · lead Inverter settings review
Stop the control, adjust its parameters, enable the export limitation flag and save the settings.
sec=h57 h=d6e8f90be636sec=h53 h=21c81091eb99c16 drafted · lead Communication-loss fallback configuration
Enable a fallback plan so the inverters hold a safe set point. Do not set the guard band to 0% when fallback is enabled.
sec=h35 h=a2fa68991134sec=h53 h=21c81091eb99