The short answer
Usually it's the street.
Plain English
Usually it's the street. In South Australian data, homes seeing >253 V went from ~10% to ~32% as local PV rose from <10% to 40–50% of homes.
Energy lost to these trips: ~1% on average, but 27–94% of a day at the worst sites (South Australia, 24 clear-sky days, 2018).
EN 50549-1 default settings: above 253 V (+10%) → off within 3 s; above 264.5 V (+15%) → off within 0.2 s.
Don't just raise the limit. Log the voltage at the meter, then talk to the grid operator.
Australian measurements, European settings: the physics is the same, the local numbers will differ.
Source
UNSW CEEM, "Voltage Analysis of the LV Distribution Network in the Australian National Electricity Market", report for the Energy Security Board, May 2020 (Solar Analytics data; PV-density chart p. 12; curtailment p. 15)www.ceem.unsw.edu.au ↗
EN 50549-1:2019 default over-voltage settings (253 V / 3 s; 264.5 V / 0.2 s), Bureau Veritas type-test reportsolplanet.net ↗
Where installers ask this
- Need help with 2 inverters Huawei (r/solar)
- reddit.com/r/solar/comments/1qck08d/
- reddit.com/r/SolarPakistan/comments/1kemi83/
- reddit.com/r/AskElectricians/comments/1k1ivna/
- reddit.com/r/solar/comments/wkehxw/
- Grid Overvoltage (r/nzsolar)
- reddit.com/r/solar/comments/1kiz1wq/
- reddit.com/r/SolarUK/comments/1vzaqrp/
- ACVoltHigh error message (r/solar)
- reddit.com/r/solar/comments/1t65om6/
The full answer
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How do you handle midday trips: log, call the grid operator, or change settings?
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