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How Many Solar Panels Does It Take to Power a House?

Posted: June 12, 2020
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Category: Blog


Installing Solar Panels Mandurah




If you’re considering installing solar panels for your home, you may be wondering how many you will need. There are numerous factors that need to be considered to determine how many panels you will need. Here are a few general guidelines to get you started.


How Many Solar Panels Will Supply An Average Household?


One of the first things you need to know is how much electricity you normally use. This can be done by looking at past bills. You will even be able to see your daily usage. Your power consumption is measured in kilowatt-hours (kWh). An average Australian home uses 15-20kWh per day, however this can vary considerably. For example, a single-person home may use around 8-9kWh per day, while a five-person family will use 33kWh per day.


Solar panel systems are rated in watts (W) or kilowatts (kW). For example, you’ll find systems such as 4kW, 5kW, or 10kW etc. Approximately 4kWh of electricity is produced per day from 1kW of solar panels. So, a 5kW system will generate approximately 20kWh on a good day with plenty of sunshine.


It’s important to note that the actual amount of electricity produced can vary greatly between locations and the time of year. However, these general rules can help you to understand how many solar panels you may need to get started.


To make it even simpler:



  • a) Small home (1-2 people) – 2kW system

  • b) Medium home (2-3 people) – 4kW system

  • c) Large home (4+ people) - 5kW + system


What Else Affects the Number of Solar Panels Needed?


There are other factors that will affect the number of solar panels you need or can have. This includes:



  1. 1. Roof space

  2. 2. Budget

  3. 3. Type of panels

  4. 4. The buildings surroundings (trees etc.)

  5. 5. Panel efficiency


How Does the Number of Panels Affect “Payback?”


For the average home, payback can take around six to eight years. Payback is getting back the costs outlaid on the initial purchase and installation. Solar systems have reduced considerably in price over the years, meaning that it’s quicker to get you money back on the initial installation. You may even be able to sell excess power back to the general grid which will provide more savings.


The more solar panels you install, the faster payback should be. Assuming you’re not installing more panels than you actually need. The solar panels are the cheapest part of the system, it’s the other components that add to the cost. So, it makes sense to get enough panels to cover your power usage if possible. However, you can add on in the future.


Solar panels are becoming an increasingly popular way to save money on energy costs. The number of panels needed depends on many factors, including, home size, the number of occupants, actual electricity usage, roof space, budget, and building surrounds. The initial outlay of a solar system often takes up to eight years to get back; however, that depends on the individual household. For more information about solar panels in Mandurah, contact IBreeze, we are more than happy to answer any questions.


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