The latest update to the AS/NZS 4777.1:2024 standard introduces significant changes for residential solar installations, with one of the most notable being the new 1000V rule. This change allows installers to implement higher voltage solar systems in residential settings, but only if they strictly adhere to the updated compliance requirements.

What is the 1000V Rule?

Previously, residential solar systems were limited to a maximum of 600V. However, under the new AS/NZS 4777.1:2024, systems can now operate at up to 1000V as they cede this limit to AS/NZS 5033. This higher voltage threshold opens up new possibilities for residential solar installations, enabling more efficient and larger PV arrays. The key benefit of this is that installers can now design systems with fewer strings and components, which can lead to cost savings and improved performance.

Compliance is Critical

However, using the 1000V rule is not just a simple switch to higher voltage. It comes with strict compliance obligations that must be met. These include updates to safety measures, such as:

• New signage requirements: This is particularly important if it is a battery installation because the inverter main switch needs to have the appropriate supply type (alternative vs. independent) specified. 
• Installation verification: The new standard requires detailed installation checks, including enhanced verification processes to ensure systems meet the revised safety criteria.
• Protective devices and phase balance: Installers must also update protective devices to handle higher voltages, and manage phase balance requirements to ensure the stability of the power supply.

In short, if you use one part of the new standard you must use it all. Failure to follow these requirements could lead to safety risks and non-compliance, putting installers at risk of fines or system failures.

Stay Ahead with the Latest Training

With these changes, it’s essential for installers to stay up-to-date with the latest standards. At GSES, we have launched a AS/NZS 4777.1:2024 updates course designed to help installers understand and implement the 1000V rule safely and in full compliance with the updated regulations. This course will cover everything you need to know about the new requirements, including the changes in signage, installation verification and protection devices. To know more, go to: https://www.gses.com.au/product/as-nzs-4777-12024-updates/