There are no specific incentives for off-grid solar systems; both off-grid and grid-connected systems are eligible for the same incentive called the Small-scale Technology Certificate (STC), often referred to as a rebate.
The Small-scale Technology Certificate (STC) program is an Australian government incentive that aims to reduce the upfront cost of installing renewable energy systems, including solar panels. For every megawatt-hour of electricity that your system is expected to produce over its lifetime, you receive a certain number of STCs, which can be sold to recoup some of the system’s cost. The value of STCs varies based on market conditions. This program makes renewable energy more accessible and affordable for homeowners and businesses.