Off-grid solar power is a type of solar energy system designed to supply a home with electricity without needing a connection to the main power grid. The main components of such a system include solar panels, batteries, an inverter, and sometimes a generator. Older systems might have had more complex setups, including separate solar battery chargers and battery chargers. However, modern systems are much simpler.

The cost of an off-grid solar energy system is relatively high compared to grid-tied solar panels. To simplify, an average Australian family might need a 10 kW off-grid solar system, which would cost approximately $28,000 to $32,000 in 2024. Sizing an off-grid system for a household is actually quite straightforward

Sizing an off-grid solar system is primarily based on the average energy consumption of the household. A general guideline is to allocate 10 kWh per day for a single person, with an additional 5 kWh per day for each extra person. For instance, a family of three would require around 20 kWh per day. By dividing this figure by 2, it’s recommended to have a solar system size of about 10 kW to adequately supply the household’s energy needs. Therefore, a basic setup for an off-grid solar system starts at 5 kW for one person, with an increase of 2.5 kW for each additional resident. This method offers a more accurate way to determine the required size of the system based on the household’s occupancy.