Fronius State 567 — Grid Voltage Power Reduction

What Does This Error Mean?

State 567 on a Fronius inverter means VDPR (Voltage Dependent Power Reduction) is active — the inverter is intentionally reducing output to help lower local grid voltage. This is required behaviour in many countries when grid voltage approaches the upper limit. Output returns to full when grid voltage drops.

Affected Models

Fronius Primo
Fronius Symo
Fronius Galvo
Fronius IG Plus
Fronius Tauro

Common Causes

Local grid voltage at or near upper limit (e.g., 253V on 230V grid)
PV oversupply in your neighbourhood at peak production
VDPR/Volt-Watt curve activated by grid code (e.g., AS/NZS 4777.2 in Australia)
Long distribution line where voltage rises with PV production
Recent grid code update mandating VDPR enabled

How to Fix It

Confirm State 567 is VDPR working as designed.

VDPR is a feature, not a fault. The inverter is working correctly to support the grid. The only loss is some production during peak voltage events. Verify the State 567 timing matches peak solar hours.
Check Solar.web for the production reduction.

Open Solar.web and view the daily production curve. State 567 events appear as slight production caps during midday — the curve flattens instead of rising further.
Test household voltage at peak production.

Use a multimeter at a nearby outlet during midday on a sunny day. Voltage near 253V (230V grid) confirms why VDPR is active.
Contact utility about high local voltage.

If voltage is chronically high, the utility may adjust transformer taps or add regulation. Lower grid voltage means VDPR rarely activates and your production returns to full. Service is typically free.
Ask installer about Volt-VAR addition.

Some Fronius inverters can also use Volt-VAR (reactive power adjustment) to help lower voltage without reducing real power. This is a more efficient response. Discuss with your installer.

Frequently Asked Questions

Will State 567 always reduce my Fronius production?

Only when local grid voltage is high. On most days State 567 never activates. In PV-rich neighbourhoods at peak summer, it may activate for 1–3 hours per day, reducing those hours' output by 10–30%. Annual impact is typically 1–5% of total production.

Is State 567 a problem I should fix?

VDPR is required by grid code in many countries — disabling it is generally not legal. The proper fix is to address the underlying grid voltage issue with the utility. State 567 itself is the inverter behaving correctly.