You may need to get your electrician to record both the instantaneous reading, as well as the 10-minute average, and then take these findings to your local distribution network service provider for further support. If the voltage is still high, when the system is off, on a sunny day mid-afternoon, then you might have an issue. To diagnose your particular issue, ask an electrician to test your local grid voltage while the solar system is off. A solar system can send back quite an amount of power at times and small power feeds really struggle with sustaining this and then that leads to Voltage Rise. More often than not, there is only a very small power feed supplying the shed with power for very small loads.
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The most common place for this to occur is typically when a customer request we install a solar system on their existing shed. The larger the cable running from your meter box to the connection of your inverter the lower risk you have of encountering this issue. This could be all it takes to push you over the edge and trip the inverter. The maximum voltage rise allowed in Australia is 2%. A voltage rise can occur at the point of common coupling, due to the electrically resistant nature of the cable. There is also another culprit, and that’s if your local grid sits just under the limit, and your system pushes it over. Contact your local distribution network service provider, who should immediately come and fix the issue. If it is tripping, then you’re seeing voltages of over 258V. 230V should be the standard voltage with a +10%, -6% range, meaning it should not go above 253V. If you’re seeing tripping or power reduction frequently, then it may be that your grid is not complying with Australian Standards. These are safety features that have been designed to maintain your grid and avoid any potentially dangerous situations that can result from excessive voltage. It’s important to realise that your system isn’t doing this randomly, or just to annoy you.
To cope, your inverter might reduce its power output, something that’s called ‘volt-watt response mode’. you haven’t broken one of the rules outlined above, but the voltage is still at a concerning level.
This happens when the voltage isn’t quite high enough to trip the inverter, i.e. If you see an over-voltage error when your inverter trips, then your inverter has not complied with one or both of these standards.Īnother common problem isn’t that the inverter disconnects, but that it goes into a power reduction mode. While it may seem like your inverter has a mind of its own, there’s actually a simple explanation.Īccording to Australian Standards, an inverter must immediately disconnect from the grid, or ‘trip’, if the AC voltage over any 10-minute period exceeds 255V, or the voltage at any time exceeds 258V. Have you noticed that your inverter seems to trip frequently, or that it’s reducing power on over-voltage.
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