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A 20kW solar system is a high-capacity energy solution designed for large homes, farms and medium-sized commercial properties across Australia. It delivers reliable, efficient performance for properties with high daily electricity needs — an ideal investment for long-term energy control and savings.
Compared to smaller systems, a 20kW commercial solar system produces significantly more power — suitable for properties consuming 2,000 kWh or more per month, with scalability and stability in areas with volatile grid pricing.
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.
A fully optimised 20kW solar system requires:
Adding battery storage is highly recommended for users in rural or remote areas, where grid outages or peak charges are common.
With a nationwide footprint, we provide complete 20kW solar 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.
A 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.
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. In sunnier states like Queensland and WA, production is usually on the higher end, while in southern regions like Victoria or Tasmania, 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 panels, inverter brand, installation complexity and whether additional electrical upgrades are required.
The number of panels depends on the wattage 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 — 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 battery storage. Adding batteries helps you store excess solar power for use at night or during peak tariff times — especially helpful for businesses that run after hours or households wanting to rely less on the grid. Batteries add to the upfront cost but give you more energy independence and guard against rising electricity prices.
Get a free, no-obligation quote from a trusted Australian solar retailer.
Copyright © 2026 LACHLAN ENERGY PTY LTD | ABN : 694 039 846