An AC wiring error means the inverter's AC side is connected wrongly: line and neutral swapped, a second line conductor landed on the N terminal, or loose L or N conductors. An incorrectly connected grounding conductor can cause it too, as can poor earthing such as a weak ground electrode or a TT grid whose local electrode is far from the transformer electrode. The inverter flags a disturbance in the AC cabling, often as a Check L-N-PE or L/N swapped message, and will not connect to the grid. Check the whole AC run from the inverter to the feed-in meter, make sure the cable is intact, and confirm that L and N are on the correct terminals as the installation manual shows. If a second line conductor is sitting on N, move the neutral conductor to the N terminal. Also check the fuses and measure the AC voltages at the inverter connection. If the message stays after these checks and fixes, contact service, because a component or the whole inverter may need replacing.
caused_byc1 drafted · lead Installation error
Event texts describe incorrect installation of the L/N connection or a second line conductor landed on the N terminal.
sec=h14 h=ce626927b150sec=h18 h=ce626927b150sec=h16 h=ce626927b150sec=h19 h=e07f8c85653csec=h15 h=e07f8c85653cc2 drafted · lead Inadequate earthing
SMA lists a poor ground electrode design, for example a lance that is too short, and a large distance between the local electrode and the transformer electrode in a TT grid. Both create potential differences between N and PE.
sec=h1 h=441690eadc5bpresents_asc3 drafted · lead Grid connection failure
The inverter detects a disturbance in the AC cabling and will not connect to the grid.
sec=h1 h=441690eadc5bc4 drafted · lead AC polarity reversed
The inverter reports that L and N are swapped.
sec=h191 h=adf6db4a4ed9tbl=1.r11 h=29c7a1adea3ftbl=1.r7 h=29c7a1adea3faffectssec=h1 h=441690eadc5bsec=h1 h=441690eadc5bdetected_byc7 drafted · lead Grid voltage measurement
Measure the AC voltages at the inverter's AC connection.
sec=h1 h=441690eadc5bsec=h14 h=ce626927b150sec=h18 h=ce626927b150sec=h16 h=ce626927b150c8 drafted · lead Fuse inspection
sec=h1 h=441690eadc5breview note: support check: partial - The passage says to check the fuses as part of the corrective steps, but it does not present this as a detection method that identifies the error.
mitigated_byc9 drafted · lead Wiring and terminal check
Move the neutral conductor to the N terminal where a second line conductor was landed there.
tbl=1.r12 h=ca2062a0b2d4sec=h19 h=e07f8c85653csec=h15 h=e07f8c85653cc10 drafted · lead Contact system installer
sec=h1 h=441690eadc5bc11 drafted · lead Contact manufacturer service
Do this if the message is still shown after the wiring has been checked.
sec=h14 h=ce626927b150sec=h18 h=ce626927b150sec=h16 h=ce626927b150c12 drafted · lead Inverter replacement
Only if the error remains after the AC wiring, the fuses and the AC voltage have been checked and corrected.
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