New build so was all good.
YES. Mine did.
We had the line voltage too high for a bit and my installer had it sorted well fast - he had Ergon fix their side, sort some setting in the transformer, and I have a mate that had the same issue and Ergon would not sort it.
@MasterOfReality - issue being, if the line voltage is too high (which can occur with too much solar in the area - your inverter detects this and will shutdown, as it does not have enough voltage to "push" power to the grid. This means you don't get any solar at all until the voltage difference changes
I'll try to be brief...
Ergon would have changed the tapping ratio on the transformer. Your typical pad mount substation takes a nominal 11kV supply and drops it to the 400V 3-phase supply that feeds the street. There’s usually a manual adjustment of +/-5% on the 11/0.4kV conversion ratio to allow for fluctuations on the 11kV line voltage, to ensure the low voltage side remains within mandated limits, that being -6% to +10%. So that's 390V to 457V for 3-phase and 216V to 253V for single phase.
Traditionally, the transformer tapping ratios were set to suit supply of power from the grid to the street, but the problem that starts to occur with saturation of larger domestic solar systems in the neighbourhood is that there is a net power export back to the grid - the transformer is no longer transferring power from the 11kV to the 400V side, but from the 400V side to the 11kV side. To 'push' this solar power into the grid, the inverters need to operate at a higher voltage than the grid; the more local export, the higher this voltage becomes and it will often exceed the above 457V/253V limit and cause problems for your fridge, washing machine etc.
The wider problem for the energy suppliers is that during the day they need to deal with solar power entering their network, and at night it returns to a supply network. They need to actively manage the transmission and sub-distribution networks (ie. 22kV and above) to keep everything within acceptable limits. This is why there are now restrictions on installations in certain areas, limits on maximum size of PV systems and in some jurisdictions, the requirement to set the inverter to a non-unity power factor for PV systems over a certain size. Reducing power factor affects voltage, so it can be used to control under and over voltage situations.
In the case of QLD (Ergon/Energex), this used to be a flat 0.9 power factor requirement in the connection agreement, regardless of voltage, meaning you were only getting 90% of the power from your PV system. If you had a 6kW system, it would only produce 5.4kW of power. Now they allow an inverter's power factor to be voltage dependent, so it can be unity between 220V and 240V and change either side of that. There is also a requirement for the output power of the inverter to taper off above 253V as well - essentially a gross limit on the system output when the grid voltage is too high. An inverter must be capable of being set up with these limits before it is allowed to be connected to the grid.
These graphs are from the current
QLD standard for small scale grid connected solar - other jurisdictions are likely to be similar. The first graph is the voltage/power factor ratio limit, the second the voltage / power output limit. Yes, your inverter could throttle back to 20% of rated capacity if the voltage in the area gets to 260V. It's not all doom and gloom though, the suppliers have become a lot better at managing it all, so your system is less likely to be operating in a hobbled state for very long on any given day. For those that might have an inverter that is set to the old fixed 0.9 power factor, you should look at changing it to the voltage dependent mode of operation, so you get back to 100% output when conditions permit. Check with whoever installed it to find out how they set it up.
The reduction in feed in tariffs is actually a good thing, as it disincentivises people from 'selling power' during the day by limiting their domestic consumption and pushing maximum kWh to the grid to rake in all that high feed in tariff income, at the cost of high local voltage. Your bank balance might appear to win, but you might be replacing your household electrical items more often! It's better that households consume their solar power during the day, reducing your demand at night when you are likely to be reliant on fossil fuel derived power. The ideal size PV system should be that which meets your daily kWh need, and exports enough surplus to pay for the power you use at night (or charge your battery if you have one). A net positive export system that actually exceeds your total needs is ok too, not all folks can afford solar or they live in a unit and can't install solar. Allowing them to essentially buy the 'clean' energy you are adding to the grid is a good thing.