Copyright © 2026 LACHLAN ENERGY PTY LTD | ABN : 694 039 846
20kW Solar System
A 20kW solar system is a high-capacity energy solution designed for large residential homes, farms, and medium-sized commercial properties across Australia. It delivers reliable, efficient performance for properties with high daily electricity needs making it an ideal investment for long-term energy control and savings.
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Compared to smaller systems, a 20kW commercial solar system produces significantly more power, making it suitable for properties consuming 2,000 kWh or more per month. It also offers scalability and stability in areas with volatile grid pricing especially in parts of Australia with peak usage rates.
Every Lachlan Solar system is designed for performance, value, and durability. Your package includes:
All components are selected to suit Australian conditions, ensuring long-term performance and reliability.
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A fully optimised 20kW solar system requires:
Adding a 20kW solar system with battery storage is highly recommended for users in rural or remote areas, where grid outages or peak charges are common.
Boost Your Business with 20kW Solar
A powerful system for small to medium commercial operations.
With a nationwide footprint, Lachlan Solar provides complete 20kW solar system installation services:
Our SAA-accredited team ensures every installation is safe, efficient, and optimised for maximum ROI.
With Lachlan Solar, you get a system built to perform and a team you can rely on anywhere in Australia.
Check 20kW System PriceA 20kW solar system from Lachlan Solar delivers the performance and flexibility modern properties demand. Whether you’re powering a large family home, a regional farm, or a commercial building, we’ll help you take control of your energy future with confidence.
Request your free assessment today and take the first step toward smarter solar energy.
A 20 kW solar system is ideal for small to medium businesses, farms, schools, and large homes with high daytime energy consumption. It suits properties where electricity bills are consistently in the range of $1,000–$1,500 per month and where power is used mostly during daylight hours.
On average, a 20 kW system in Australia generates between 70–85 kWh per day, depending on location, panel orientation, and weather conditions. In sunnier states like Queensland and Western Australia, production is usually on the higher end, while in southern regions like Victoria or Tasmania, the output may be slightly lower.
A 20 kW system typically requires around 100–120 square metres of roof space, depending on the efficiency and size of the panels used. A clear, unshaded roof facing north is ideal, but east- or west-facing installations can also work effectively with only minor production losses.
In 2025, a quality 20 kW solar system in Australia generally costs between $18,000 and $25,000 after government rebates (STCs). The final price depends on the choice of panels, inverter brand, installation complexity, and whether additional electrical upgrades are required.
The number of panels depends on the wattage of the panels selected. For example:
Installers usually recommend higher-wattage panels to save space and reduce overall system size.
For most Australian businesses and households with high electricity usage, the payback period is typically 3 to 5 years. Properties with high daytime power demand, such as workshops, offices, and farms, tend to recover costs faster because they use most of the solar power directly instead of exporting it.
Yes, a 20 kW solar system can be paired with a battery storage solution. Adding batteries helps you store excess solar power for use at night or during peak tariff times. This can be especially helpful for businesses that run after hours or for households wanting to rely less on the grid. Even though solar batteries add to the upfront cost, they give you more energy independence and help guard against rising electricity prices.
Copyright © 2026 LACHLAN ENERGY PTY LTD | ABN : 694 039 846
