How much energy will a 30kW solar system produce?
The actual power output of a 30kW solar system varies widely depending on several factors, but on average you can expect the output to be between 100 and 120kWh per day.
- Summer vs winter. Longer sunlight hours mean more power
- Location in Australia
- Weather condition
30kW solar system output by city
| Capital City | Approximate average daily energy yield | Approximate average annual energy yield |
|---|---|---|
| Adelaide | 109 - 122kWh | 45,990kWh |
| Brisbane | 116 - 122kWh | 45,990kWh |
| Darwin | ~133kWh | 48,180kWh |
| Canberra | 108 - 124kWh | 47,085kWh |
| Melbourne | 94 - 108kWh | 39,420kWh |
| Perth | 120 - 131kWh | 48,180kWh |
| Hobart | 86 - 99kWh | 38,325kWh |
| Sydney | 102 - 113kWh | 42,705kWh |
How much does a 30kW solar system cost?
A 30kWh solar system installed will cost between $25,300 and $31,600 depending on the quality of system you go for.Â
Other factors include the government rebate available in your city, the complexity of the install and the heigh of your roof.
With a payback period of between 3 – 5 years, depending on your power consumption, it’s a no-brainer if you own the building and have no plan to move in the next five years.
| City | Average cost | Average cost per watt |
|---|---|---|
| Adelaide, SA | $28,957 | $1.02 |
| Brisbane, QLD | $28,957 | $0.91 |
| Canberra, ACT | $28,957 | $1.01 |
| Hobart, TAS | $31,443 | $1.11 |
| Melbourne, VIC | $31,443 | $0.95 |
| Sydney, NSW | $28,957 | $0.89 |
| Perth, WA | $28,957 | $1.08 |
| Average | $28,957 | $0.98 |
How much roof space is required for a 30kW Solar Power System?
The amount of roof space you will need depends on the type of panels you use. Panels with a higher wattage will be more efficient, so you will only need a few of them on your roof.
For instance, a 250W solar panel measures approximately 1.7m x 1m. So, for a 30kW solar system, you will require about 50.0m2 of roof space.
What is the average payback period for a 30kW solar system?
On average, the payback period for a high-quality 30kW solar system ranges between 3-5 years. Factors like daily usage during sunshine hours and the type of electrical equipment used will affect the payback period of your system.
The panels’ IRR (internal rates of return) can hit 20% – 30% across the country.
How many solar batteries do I need for a 30kW solar energy system?
To work out the number of batteries or size of battery needed for a 30kwh solar system, you will first need to look at the output and usage. The average daily output for a 30kW solar system is approximately 120kWh. Therefore, you will need batteries to store about 70% of that (84kWh) for use at night.Â
The Tesla Powerwall 2 batteries are one of the best options in the market. Each battery stores about 14kWh. Therefore, you will need 6 batteries to generate the required 84kWh for your solar energy system.
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FAQ's
The 30kW solar system is a large generation unit suited for small to medium-sized businesses. This system can be ideal for residential use, provided you have enough roof space and your power consumption is consistently high.
On average, the 30kW solar system produces between 110kWh and 180kWh of power daily. Around 82 to 120 CEC-approved solar modules are usually paired with this system, but the actual number will depend on the wattage of the panels you use. You will also need a 27kW, or two 15kW CEC-approved inverters, electrical kit, and roof mounting approved for use in Australia.
The amount of money you can save from your 30kW solar system will depend on how much electricity you use in your business or home.
However, the Australian power grid is the most expensive in the world. Even if you turn to a conventional grid, keeping your home or business powered around the clock may still be costly.
Suppose your system generates an average of 120kWh daily, and you pay a 25c tariff to your solar provider. In this case, you can save up to $30 per day from your 30kW solar system, provided you consume all the power your system generates. So, your estimated annual savings will be approximately $10,950.
If you want to lower your monthly power bill, the 30kW solar system is an excellent investment. With proper care and maintenance, the system can yield results for more than 15 years.
30kW solar systems consist of different numbers of modules depending on the size of solar panel you use. Below are some common panel sizes that can make up a 30kW solar system.
- 240W (125 x solar modules to make 30kW)
- 250W (120 x solar modules to make 30kW)
- 260W (115 x solar modules to make 30kW)
- 300W (100 x solar modules to make 30kW)
- 330W (91 x solar modules to make 30kW)
