3kW Solar Panel Systems: Costs, Output, and Returns


How a lot does a 3kW solar system value in Australia, and the way a lot energy are you able to anticipate it to supply? This article takes a glance a these questions, in addition to returns and payback durations for 3kW solar methods.

How many panels & how a lot roof house for 3kW of solar panels?

As residential solar panels a usually between 330 and 400W nowadays, a 3kW (3,000W) solar sytem would require between about 7-10 solar panels. A typical solar panel is round 1m x 1.7m, subsequently a 3kW system would require about 12-17 m2 of roof house, relying on the wattage of the panels. You can discover what number of panels will match in your roof utilizing satellite tv for pc imagery through Solar Choice’s quote comparability platform.

As per the highest picture, most residential roof areas could have enough room for a 3kW solar system.


How a lot does a 3kW solar system value?

Solar Choice tracks the worth of solar power methods in Australia by our community and database of over 200 solar installers. We publish common costs month-to-month by the Solar Choice Price Index which you’ll check with at any level. The newest common value for a totally put in 3kW solar system is $3,980 which included the STC rebate and GST. See the complete breakdown on the desk under which is up to date each month:

Average Price of 3kW Solar System by Australian City

All $3,980
Adelaide, SA $3,480
Brisbane, QLD $3,850
Canberra, ACT $3,700
Darwin, NT $5,810
Hobart, TAS $4,540
Melbourne, VIC $3,780
Sydney, NSW $3,910
Perth, WA $2,780


There are many elements that may affect the worth you may be quoted. To provide you with an concept of a number of the essential issues to look out for:

  1. The high quality of merchandise utilized in your system – be cautious of quotes that look too low-cost
  2. Double story homes require further gear to get installers and the solar panels as much as the roof
  3. Tile or concrete roofs are costlier as totally different mounting methods are required

History of costs for 3kW solar methods in Australia.

Taking a historic view of the Solar Choice Price Index we will see that costs greater than halved within the final 8 years.

3kW Solar panel system costs from 2012 to 2022.JPG

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Power output for a typical 3kW solar system

How a lot solar energy will a 3kW solar system produce? That is dependent upon quite a lot of situational elements equivalent to location, orientation & tilt of the panels, the presence of shading and the general effectivity of the parts within the system.

It’s handy to summarise solar system output in a single determine – particularly, kilowatt-hours per day (kWh/day) as within the under desk. In actuality there can be a major distinction within the daylight a solar panel receives throughout winter months and summer time months. In most cities in Australia a solar system will on common produce over twice as a lot energy in January than in July.

The desk under gives some tough figures on common day by day outputs from 3kW solar methods in a handful of Australia’s capital cities (understand that figures can be greater in summer time and decrease in winter). All conditions assume the solar panels are mounted with a north-facing side with a tilt equal to the latitude of town and an general system effectivity of 80%. (Data supply: Bureau of Meteorology.)

 Average 3kW solar system energy yields
Adelaide 10.9 kWh per day 3,979 kWh per 12 months
Brisbane 11.6 kWh per day 4,234 kWh per 12 months
Canberra 11.5 kWh per day 4,198 kWh per 12 months
Darwin 14.2 kWh per day 5,183 kWh per 12 months
Hobart 9.2 kWh per day 3,358 kWh per 12 months
Melbourne 10 kWh per day 3,650 kWh per 12 months
Perth 12.8 kWh per day 4,672 kWh per 12 months
Sydney 10.9 kWh per day 3,979 kWh per 12 months

Getting essentially the most out of your system by maximising ‘solar self-consumption’

These days, the easiest way to economize with solar is to make use of the energy your self (‘self-consumption‘). For every unit (kWh) of solar energy that you use directly, you reduce the amount of energy that you have to purchase from the grid – at rates around 25c/kWh in most of Australia. In contrast, if you let your solar energy go into the grid, you will currently earn about 5-12c/kWh. As a result, the percentage of energy that is ‘self-consumed’ will have an effect on the methods general monetary return.

By operating home equipment throughout the day when your solar panels are producing power, you routinely eat the solar energy as a substitute of grid electrical energy; solely the surplus solar energy is ‘exported’ to the grid. In common, Solar Choice would suggest choosing a system dimension the place you anticipate to self-consume a minimal of 30% to be sure you the system will pay for itself throughout the first 3-5 years.

Home energy administration methods, sizzling water diverters and timers are some well-liked methods for growing solar self-consumption. Home battery storage can be more and more in demand, however excessive out-of-pocket prices for battery methods make this strategy much less engaging in the interim (though battery system costs are anticipated to come back down dramatically within the coming years).

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Typical monetary return and payback interval for a 3kW solar system

Using Solar Choice’s Solar PV System Payback Calculator, we now have calculated the payback interval and IRR for typical eventualities in every of the state capitals in Australia. This is designed to be a information and we suggest getting a current energy invoice and utilizing our calculator to your personal circumstances. All of the under returns are higher than what you may get by leaving your cash on the financial institution and ignores the environmental advantages of placing solar panels in your roof!

The costs used are reflective of the current common prices for 3kW solar methods as noticed within the Solar Choice Price Index. You can enter your particular quoted value and parameters into our calculator.

System Cost Assumed Electricity Rate Assumed Feed In Rate Assumed Daily Energy Usage Payback Period IRR
Adelaide $3,360 24c 7c 15 kWh 4.1 Years 24%
Brisbane $3,940 20c 5c 15 kWh 5.7 Years 17%
Canberra $3,560 19c 7c 15 kWh 5.3 Years 18%
Darwin $5,810 27c 9c 15 kWh 5.7 Years 17%
Hobart $4,880 23c 7c 15 kWh 6.5 Years 14%
Melbourne $3,720 19c 8c 15 kWh 5.8 Years 16%
Perth $2,870 29c 6c 15 kWh 2.9 Years 35%
Sydney $3,690 18c 6c 15 kWh 6.0 Years 16%
  • This assumes that fifty% of the entire energy consumption (15 kWh) is used throughout the daytime.
  • Pricing per watt put in is unfavourable for 3kW methods in most states, it may enhance the payback interval to take a look at a bigger system

What a few bigger system dimension?

If you’re studying this text, chances are you’ll very nicely have determined that 3kW is the best dimension to your home. If you’re not but certain about the best dimension for you, nevertheless, it is perhaps helpful so that you can know that 6.6kW is now the most well-liked solar system dimension in Australia. In truth, we’ve labored out {that a} 5kW system could even be a greater funding for a lot of properties than a 3kW system – see this text.


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Since 2008 our information and complicated software program has allowed over 160,000 Australian households and companies to make a well-informed alternative on their solar & battery installer.


© 2019 Solar Choice Pty Ltd

Jeff SykesJeff Sykes

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