8kW Solar Systems: Compare outputs, installers and returns

Rooftop solar power has taken Australia by storm, with greater than 10% of appropriate rooftops now decked out with solar panels throughout the nation. Different sizes of solar PV methods have proliferated relying on which incentives & what costs have been obtainable on the time of set up, in addition to on the electrical energy wants of the home or enterprise in query.

Generally talking, 15 kilowatts (kW) is the higher restrict for residential solar methods in Australia as a result of a system of this dimension will produce ample electrical energy to satisfy a home’s daytime electrical energy wants. An 8kW solar system–simply between the 15kW higher restrict and intensely common 6.6kW solar methods–can be ideally suited to a home with barely increased electrical energy demand than common.

How many solar panels and roof house do you want for a 8kW solar system?

These days solar panels normally are available rated someplace between 330 watt (W) to 400W. That means for 8kW solar system (or 8,000 watts) you’ll require 20-24 solar panels. This quantity has decreased quite a bit over the past decade because the effectivity of solar panels has improved.

Each panel typically measures out to 1.7m2. You additionally must think about the house required between the panels for upkeep and entry, together with exclusion zones close to the perimeters and ridges of the roof. For a typical 8kW system you’ll require 45 – 60m2 of roof house.

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How a lot does an 8kW solar system value?

Fortunately in Australia there’s a federal rebate (known as the STC rebate) which covers round 30-35% of the upfront prices of putting in solar, imply we’ve among the most cost-effective costs for solar wherever on this planet.

Every month Solar Choice publishes solar system costs from throughout Australia primarily based on uncooked pricing knowledge from our installer community into the Solar Choice Price Index. Based on this knowledge from March 2022, we are able to see that on common an 8kW solar system would value $7,737 in Australia after the STC rebate has been deducted and together with GST. The under desk breaks down the prices for a 8kW system by state and calculates the associated fee per watt:

Average 8kW solar panel costs primarily based on Solar Choice Price Index

City Out of pocket value (incl GST and incentives) Cost per watt, put in
Adelaide $6,766 $0.85
Brisbane $7,794 $0.97
Canberra $7,429 $0.93
Hobart $8,411 $1.05
Melbourne $6,720 $0.84
Sydney $6,823 $0.85
Perth $6,411 $0.80
Average: $7,737 $0.97

In the under graph you possibly can see that the worth of solar has fallen considerably over the past decade however is beginning enhance with the rising prices of solar panels and the discount within the STC rebate.

Price Index - Feb 2022


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How a lot energy will a 8kW solar system produce?

As with any solar PV system, precise power output for an 8kW system will rely upon a lot of variables.

-Location and local weather

–Tilt & orientation of the solar panels

–Presence or absence of shading

-How scorching the solar panels get (overheating can scale back power output, whereas cooler situations are typically extra beneficial)

-The high quality and sizing of the system’s inverter(s)

-The efficiency of those and different parts within the system

Perhaps essentially the most fundamental issue included within the record above is the quantity of daylight that’s obtainable in a given area. The metric utilized by the solar business to measure solar potential is ‘Peak Sun Hours’ (PSH). A Peak Sun Hour is the equal of 1 hour of full daylight. As the solar strikes via the sky, the energy of the rays it casts on a specific location varies. Most locations expertise peak solar round midday or 1pm, whereas sunshine is weaker within the late afternoon and early morning.

The excellent news is that we’ve labored this out for you. See the under desk which breaks down the output in all the foremost cities in Australia:

 Indicative every day 8kW solar panel output by capital metropolis

City Average Daily Production Estimated Annual Production
Adelaide 31 kWh per day 11,242 kWh
Brisbane 32 kWh per day 11,680 kWh
Canberra 31 kWh per day 11,242 kWh
Darwin 35 kWh per day 12,848 kWh
Hobart 25 kWh per day 9,052 kWh
Melbourne 27 kWh per day 9,782 kWh
Perth 34 kWh per day 12,264 kWh
Sydney 29 kWh per day 10,512 kWh


  • kWh figures labored out utilizing PVWatts and historic daylight knowledge from the Bureau of Meteorology
  • The methods effectivity is conservatively estimated to be 75% for the entire system
  • For this train we’ve assumed the panels are north-facing with a tilt of 30 levels


8kW solar methods: Payback & Returns

Like solar system output, payback durations and returns on funding for a solar system of any dimension are depending on a lot of elements. The fundamental issues that make solar power such a superb funding in Australia are the comparatively low value of getting a system put in and the excessive value of electrical energy.

Meanwhile, state-based solar feed-in tariffs, which have been as soon as the first incentive mechanism for going solar, have been decreased and relegated to a much less vital cause for going solar. Feed-in tariffs are actually both voluntary or minimal in most of Australia–which means that an electrical energy retailer shouldn’t be required to pay solar properties and companies something for his or her extra power. Understanding the implications of that is key to getting essentially the most out of a system.

Focus on solar self-consumption of solar power is now the rule

If you personal a solar system, you’ll want to devour as a lot of the power it produced as doable as a result of this can prevent the best amount of cash in your power invoice. The charges for electrical energy bought from retailers (wherever from 18¢-27¢ or extra relying on the placement, retailer, and tariff in query) are considerably increased than the feed in tariffs provided by the identical retailers for extra solar power.

We have put collectively an summary of some typical eventualities for customers contemplating an 8kW solar system. Please take word we’ve assumed the energy utilization is 35 kWh per day on common which is increased than the typical in Australia.

Indicative payback durations for 8kW solar panel methods

8kW System Cost Electricity Price Feed in Rate Self Consumption Rate IRR Annual Savings Payback Period (Years)
Sydney $6,720 25c 7c 30% 22% $1,463 4.5 years
60% 35% $2,250 3.0 years
Brisbane $7,794 18c 5c 30% 14% $1,117 6.8 years
60% 23% $1,685 4.5 years
Melbourne $6,720 27.5c 6c 30% 22% $1,462 4.5 years
60% 37% $2,392 2.8 years
Perth $6,411 28.8c 5c 30% 25% $1,588 4.0 years
60% 42% $2,610 2.4 years
Adelaide $6,766 29c 9c 30% 27% $1,806 3.7 years
60% 41% $2,687 2.5 years
Hobart $8,411 27c 8.5c 30% 18% $1,507 5.4 years
60% 29% $2,323 3.5 years
Canberra $7,429 20c 7c 30% 17% $1,289 5.6 years
60% 26% $1,867 3.9 years


  • We have assumed the family common every day energy utilization is 35 kWh per day (increased than common energy utilization)
  • The costs are primarily based on the most recent Solar Choice Price Index
  • Self-consumption charges of 30% (low) and 60% (very excessive) have been chosen as examples solely and as you possibly can see are essential to the monetary final result

calculator iconYou can calculate the end result in your personal circumstances with the Solar Choice Payback Calculator


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Jeff Sykes Jeff Sykes

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