10kW off-grid solar system or stand-alone solar system can cost from $28,000 to $35,000 depending on the type of off-grid solar equipment and the complexity of the installation site. Most domestic installations always fit into this price range.
In some cases, the cost of a 10kW solar power system can go up to $50,000 or more, mainly because of the inclusion of a large battery bank. Batteries are a significant part of the overall cost of a solar power system, especially if you’re aiming for a high level of energy independence or need to store a large amount of energy for backup power. The price can also vary depending on the quality of the components, installation complexities, and any additional features or services included in the package.
More information
Off-Grid Solar System Sizes And Prices In Australia: A Guide For Homeowners