Off-Grid Solar System Guide for Australia

Off-Grid Solar System Components: Modern off-grid solar systems are simple and intelligent. There’s really no difference between grid-connected and off-grid systems, except that in the case of a grid-connected system, the grid is used as a backup, like a generator in an off-grid situation. The components of any off-grid solar system are straightforward: solar panels, an inverter (a device that connects the panels, batteries, and power supply), and batteries.
System Sizing: Sizing the system has become a simple procedure as solar energy equipment has become more affordable and widely available. We size the system according to average energy consumption, which makes it a straightforward calculation of 5kW of panels per person. This provides plenty of power for an easy off-grid life.
Battery Storage: Battery storage has also become more simplified, with lithium technology being commonly used. Energy storage should be a minimum of 10kWh, with an additional 5kWh per person.
Cost and Budgeting: A 10kW off-grid solar system with a 15kWh battery is most common for the average consumer, and costs start from $28k for a fully installed system. With an extended 30kWh battery bank, the cost is around $45k.
Installation and Setup: There are systems designed for nearly DIY installations, but some parts will require an electrician.
Maintenance and Troubleshooting: Maintenance is minimal, apart from cleaning the panels for better performance. Modern systems powered with AI are capable of troubleshooting or providing exact problem descriptions. The system is expected to have a 15-year lifespan, but as time has shown, we can easily expect 20 years.
Regulations and Permits: Locally in Australia, no special permit is needed to install a solar energy system, except for rebate purposes, which must be done by a solar-accredited electrician.
Energy Efficiency: Don’t worry about energy efficiency if you use all modern appliances in the house. The biggest energy consumer is water heating, which can be easily reduced by using a heat pump.
Financial Incentives: All solar systems, including off-grid solar systems, are eligible for STCs in Australia, which provide about $3500 for 10kW of solar panels in 2024.