Want to add more panels to your solar PV system? Here’s what you need to know. On 9 October 2016, changes to AS4777.2:2015 (the Australian Standard for ‘Grid connection of energy systems via inverters - Inverter requirements’) took effect which are likely to influence your plans to upgrade your existing solar PV system. What has changed? Legislation regulating solar power installations (which is guided by AS4777.2:2015) now states that you will only be entitled to receive STC (small-scale technology certificate) discounts for new solar panels if you meet the following requirements: Your system