South Australians have the highest electricity rates in the country, so it’s no surprise that nearly one in three households in the state have installed solar panels. Solar is a great way to cut down your power bills, all the while making your house more self-sufficient and environmentally friendly. Furthermore, it makes your home more attractive to prospective buyers
Average daily output of solar PV
Adelaide typically has 88 sunny days per year and 224 total days with sun, with the best months for solar production are November, December, January and February.
The optimal angle for solar panel orientation is 35 degrees from the horizontal and facing North (0° azimuth) for maximum solar production.
For our estimations, on average you would get 4.2 hours of sunlight hours which can fluctuate depending on cloudy weather or which direction the sun is shining.
On average, a household without battery storage would use 40% of their total energy production without factoring in household situations where they use more or less energy during the day.
Annual Savings calculations assume 60% of total solar production, earning back a feed-in tariff where excess electricity is sold to the grid, at 6c per kWh which is the lowest rate.
|kW System||Daily Average Production||Average Production During Summer||Average Production During Winter|
|1 kW||4.2 kWh||5.14 kWh||3.23 kWh|
|2 kW||8.4 kWh||10.27 kWh||6.47 kWh|
|3 kW||12.6 kWh||15.41 kWh||9.70 kWh|
|4 kW||16.8 kWh||20.55 kWh||12.94 kWh|
|5 kW||21 kWh||25.68 kWh||16.7 kWh|
|6 kW||25.2 kWh||30.82 kWh||19.40 kWh|
|7 kW||29.4 kWh||35.96 kWh||22.64 kWh|
|8 kW||33.6 kWh||41.09 kWh||25.87 kWh|
|9 kW||37.8 kWh||45.71 kWh||29.11 kWh|
|10 kW||42 kWh||51.37 kWh||32.34 kWh|
Sizing your system in South Australia
Take a quick look at your energy bill and you can see how much energy is being used daily. Your energy meter, however, records your energy usage every quarter (3 months) and calculates the average usage daily. When sizing your solar PV system, you would want to install enough panels to generate enough to cover your bills as much as you can.
There are about 4.2 sunlight hours per day on average, so for every 1 kW of solar panels it would output 4.2 kW daily. Even though there are 9-10 hours of sunlight, your panels output will fluctuate so 4.2 is the average amount of energy the panels will use. So, to figure out the amount to size your system, divide your average daily usage by sunlight hours.
For example, say you use 20 kWh daily, divide that by 4.2 sunlight hours and divide again by 2, assuming you use 50% of that 20 kW during the day, a 2.5 kW system would be suitable.
Are Solar Panels Worth it and Pay-back Period
Solar is definitely worth the investment and most systems pay themselves off within their lifetime. The only time solar wouldn’t reduce your power bills would be if your property wasn’t suitable for solar in the first place. Keep in mind that the payback period would increase the longer you hold off solar as: the federal rebate reduces each year (down 9% in 2021) and the feed in tariff you receive for excess electricity will reduce each year until 2031 where it will no longer earn you any credits.
To understand how much money solar panels save on your electric bills, we have to determine how much you spend on your annual electricity bills. For example, the average Australian family home uses around 19KWh per day, and when converted to electricity bill consumption, this is around $2,500 a year. Moreover, larger homes with pools and ducted reverse cycle air conditioning can easily be 50+ KWh a day or around $5,500+ a year.
If you were to multiply the above electricity consumption by the national average electricity rate (34.41 cents per kWh), you would get how much you’re spending on electricity every year. Now, let’s add solar systems to the equation. You can get “free” electricity if you generate electricity using a solar system and you don’t need to feed it back into the grid since your home is consuming the gathered solar energy.
However, keep in mind that the sun is not available 24 hours a day, so you are technically only getting free electricity from 8 am to 6 pm. Regardless of the sun’s availability, a large percentage of electricity consumption happens during this period — around 40% of the daily energy consumption. This means an average household can save up to $1000 a year when we cut off 40% of the $2,500 annual electricity bills.
Natural Technology Systems are solar providers that have been in business for over 30 years; we are a business that South Australia trusts and provides expert, obligation-free quotes and advice. We provide customers with the most cost-effective way to slash those power bills for your home or business.
Click here for a quick quote for your solar power needs, or contact us today at (08) 8344 7298. You can also email us for expert, obligation-free advice