In Australia, the cost of 10kW off-grid solar systems is influenced by several factors, including location, system components, and battery storage. Here’s an updated summary without the payback and savings details:

1. Price Range: The price for 10kW off-grid solar systems typically falls between $25,000 and $35,000. This range reflects variations due to the quality of components, battery storage options, and specific household needs.
2. Battery Storage Costs: One of the significant factors in the cost of off-grid systems is the need for substantial battery storage. This is especially critical for powering homes during periods of lower sunlight, such as winter months. The cost and lifespan of batteries are important considerations, with replacements often needed every ten years​​.
3. Energy Generation Capacity: A 10kW solar system can generally generate about 40kWh per day, though this depends on the location, solar panel orientation, and amount of daily sunlight. This capacity is typically sufficient for average-sized Australian households​​.
4. Variation by Location: Installation costs vary across different cities in Australia. Factors like local market conditions, installation complexities, and equipment quality can cause price differences in cities like Sydney, Melbourne, and Brisbane​​.

These points provide a comprehensive overview of the costs associated with installing a 10kW off-grid solar system in Australia, highlighting the importance of considering location, system specifications, and battery storage in the overall cost.