How Many Solar Panels Do I Need for My Porperty?

by | Sep 1, 2023 | Uncategorized | 0 comments

At Solarnest, we understand that making the switch to solar energy is an investment in both sustainability and savings. One of the first questions many of our clients ask is, “How many solar panels do I need for my home or business in Australia?” Finding the right answer requires careful consideration of several factors to ensure your solar panel system is tailored to your specific needs and location.

Step 1: Calculate Your Energy Consumption

The first step in sizing your solar panel system is to assess your daily energy consumption. Your electricity bills provide valuable insights, typically detailing your monthly or daily energy usage in kilowatt-hours (kWh). To estimate daily consumption, divide your monthly usage by the number of days in the billing cycle.

Step 2: Assess Your Location

Australia’s diverse climate and geographical regions mean that the amount of sunlight your location receives varies. Northern areas like Queensland and Western Australia generally enjoy more sunlight compared to southern regions like Tasmania. To optimize solar energy generation, consider your specific location, shading, and the ideal orientation and tilt of your solar panels. Local weather patterns and seasonal changes also play a role in your solar panel system’s efficiency.


Step 3: Determine Solar Panel Efficiency

Solar panels come in different efficiencies, typically ranging from 15% to 20%. To calculate how many solar panels you need, consider this efficiency. Here’s a simple formula:

Total Daily Energy Consumption (kWh) / Solar Panel Efficiency (%) = Required Daily Solar Energy Production (kWh)

For instance, if your daily energy consumption is 30 kWh, and your solar panels are 18% efficient:

30 kWh / 18% = 166.67 kWh

Step 4: Evaluate Available Roof Space

The physical space on your roof or property is a crucial factor. Standard residential solar panels usually occupy around 1.6 square meters (17.22 square feet) each. Calculate how many panels can comfortably fit on your available roof space, accounting for any obstructions or irregularities.

Step 5: Select the Right System Size

Solar panel systems in Australia are typically sized in kilowatts (kW). Residential systems range from 3 kW to 10 kW, while larger installations cater to commercial and industrial needs. Choosing the appropriate system size depends on your energy requirements and available space.

Step 6: Consult Solarnest Experts

Sizing your solar panel system can be intricate due to the interplay of numerous factors. To ensure accuracy and optimal performance, consult with Solarnest’s experienced solar experts. We can conduct a comprehensive site assessment, considering your energy needs, location, shading, and roof conditions. Our goal is to recommend the perfect system size and panel configuration for your home or business in Australia.


Sizing your solar panel system is a crucial step towards a sustainable and cost-effective energy solution. By following these steps and seeking guidance from Solarnest’s experts, you can embark on your solar journey with confidence. Our team is dedicated to ensuring that your solar PV system is perfectly sized to harness the Australian sunlight efficiently and meet your unique energy needs. Together, let’s embrace clean and renewable energy for a brighter, greener future.

Written by Solarnest