Rooftop solar power has taken Australia by storm, with more than 10% of suitable rooftops now decked out with solar panels across the country. Different sizes of solar PV systems have proliferated depending on which incentives & what prices were available at the time of installation, as well as Contact online >>
Rooftop solar power has taken Australia by storm, with more than 10% of suitable rooftops now decked out with solar panels across the country. Different sizes of solar PV systems have proliferated depending on which incentives & what prices were available at the time of installation, as well as on the electricity needs of the home or business in question.
Generally speaking, 15 kilowatts (kW) is the upper limit for residential solar systems in Australia because a system of this size will produce sufficient electricity to meet a home''s daytime electricity needs. An 8kW solar system–just between the 15kW upper limit and extremely popular 6.6kW solar systems–would be ideally suited for a home with slightly higher electricity demand than average.
These days solar panels usually come in rated somewhere between 330 watt (W) to 400W. That means for 8kW solar system (or 8,000 watts) you will require 20-24 solar panels. This number has reduced a lot over the last decade as the efficiency of solar panels has improved.
Each panel generally measures out to 1.7m2. You also need to take into consideration the space required between the panels for maintenance and access, along with exclusion zones near the edges and ridges of the roof. For a typical 8kW system you will require 45 – 60m2 of roof space.
Fortunately in Australia there is a federal rebate (called the STC rebate) which covers around 30-35% of the upfront costs of installing solar, mean we have some of the cheapest prices for solar anywhere in the world.
In the below graph you can see that the price of solar has fallen significantly over the last decade but is starting increase with the rising costs of solar panels and the reduction in the STC rebate.
As with any solar PV system, actual power output for an 8kW system will depend on a number of variables.
Perhaps the most basic factor included in the list above is the amount of sunlight that is available in a given region. The metric used by the solar industry to measure solar potential is ''Peak Sun Hours'' (PSH). A Peak Sun Hour is the equivalent of one hour of full sunlight. As the sun moves through the sky, the strength of the rays it casts on a particular location varies. Most places experience peak sun around noon or 1pm, while sunshine is weaker in the late afternoon and early morning.
The good news is that we have worked this out for you. See the below table which breaks down the output in all the major cities in Australia:
Like solar system output, payback periods and returns on investment for a solar system of any size are dependent on a number of factors. The main things that make solar power such an excellent investment in Australia are the relatively low cost of having a system installed and the high cost of electricity.
Meanwhile, state-basedsolar feed-in tariffs, which were once the primary incentive mechanism for going solar, have been reduced and relegated to a less important reason for going solar. Feed-in tariffs are now either voluntary or minimal in most of Australia–meaning that an electricity retailer is not required to pay solar homes and businesses anything for their excess power.Understanding the implications of this is key to getting the most out of a system.
If you own a solar system, you will want to consume as much of the power it produced as possible because this will save you the greatest amount of money on your power bill. The rates for electricity purchased from retailers (anywhere from 18¢-27¢ or more depending on the location, retailer, and tariff in question) are significantly higher than the feed in tariffs offered by the same retailers for excess solar power.
We have put together an overview of some typical scenarios for consumers considering an 8kW solar system. Please take note we have assumed the energy usage is 35 kWh per day on average which is higher than the average in Australia.
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Helping Australians make awell-informed decision since 2008
Did you know that 8kW solar power systems can consist of a different number of panels depending on the size of the solar panels? Here are some common panel sizes which could make up a 8kW system:
Depending on where in Australia (or around the world) you are, a 8kW solar system will produce a different amount of energy each day. As an average amount, you can see here how much this system will produce in some of the major regions in Australia by switching between each tab.
Inverters can be sized differently to your overall panel array.
While your panel array might be 8kW, the inverter could be either less or more than this size. Normally it is bad to have a much larger inverter than panels. It is usually good to have an inverter that is less than the array size.
A 8kW solar array can be put with an inverter with an AC output of 6.00kW.
What you "can" do is not what you "should" do. All inverters have different specs. And based on those specs you might be able to put a LOT more panels on than the rated inverter capacity. That does not mean you should. Thankfully the Clean Energy Regulator has made an "easy ratio" to follow.
About 8kw solar system daily output
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By interacting with our online customer service, you'll gain a deep understanding of the various 8kw solar system daily output featured in our extensive catalog, such as high-efficiency storage batteries and intelligent energy management systems, and how they work together to provide a stable and reliable power supply for your PV projects.
