When investing in a solar system, most homeowners focus on system size and price. However, a factor that is often overlooked—but incredibly important—is geographic location and local climate. Australia is a vast country with highly variable weather patterns, and these can significantly influence how much energy your 10 kW or 13.3 kW solar system produces throughout the year.
In this article, we’ll explore how location-specific elements such as sunlight hours, temperature, and seasonal conditions can affect system performance and output.
The Australian Advantage: Abundant Sunlight
Australia is one of the sunniest countries in the world, making it ideal for solar energy production. Most regions receive between 4 to 6 hours of peak sun per day, which is plenty for both 10 kW and 13.3 kW systems to generate meaningful savings.
Comparing System Performance by Location
1. Brisbane, QLD
- Avg. peak sun hours: ~5.5/day
- Performance: Excellent
- Recommended system: A 13.3 kW solar system can fully leverage Brisbane’s consistent sunshine, especially for families with pools or AC usage.
2. Sydney, NSW
- Avg. peak sun hours: ~4.5/day
- Performance: Very Good
- Recommended system: A 10 kW solar system is often sufficient for most Sydney homes. A 13.3 kW system can provide additional energy for EVs or batteries.
3. Melbourne, VIC
- Avg. peak sun hours: ~4/day
- Performance: Moderate
- Recommendation: Due to more overcast days, a 13.3 kW system may offer better reliability and surplus energy generation for the grid or storage.
4. Perth, WA
- Avg. peak sun hours: ~5.5/day
- Performance: Excellent
- Ideal system: Either system will perform very well, but a 10 kW system may be enough for most households.
5. Hobart, TAS
- Avg. peak sun hours: ~3.5/day
- Performance: Fair
- Suggestion: Go for a 13.3 kW system to compensate for fewer sunny days and get the most from limited sunlight.
How Weather Affects Output
- Cloud cover: Reduces production but not entirely—solar panels can still generate power under diffused light.
- High heat: Surprisingly, extremely hot days can reduce panel efficiency. Panels work best around 25°C.
- Winter seasons: Shorter days and a lower sun angle reduce generation. A larger system (like 13.3 kW) helps bridge the seasonal gap.
- Dust and debris: Common in dry areas like rural NSW or outback WA; regular cleaning ensures optimal output.
Should You Oversize Based on Climate?
In areas with less consistent sunlight, oversizing your system can be a smart move. This allows:
- More energy during cloudy days
- Greater self-sufficiency in winter
- Increased feed-in returns on brighter days
A 13.3 kW system is a smart investment in these regions if your budget and roof space allow.
Final Thoughts
While both 10 kW and 13.3 kW solar systems offer strong returns, their real-world performance depends on where you live and your local weather conditions. Consulting with a solar provider who understands regional nuances ensures you get a system that delivers year-round efficiency and value.