A 15kW solar system for Kennards Hire in Rutherford, NSW.
15kW solar programs are an awesome system measurement for properties with excessive ranges of energy consumption or companies with small to middling energy wants – supplied that they’ve enough roof house to put in one. This article takes you thru (nearly) all the pieces you may need to find out about 15kW solar programs, together with how a lot house they take up, how a lot they price, and the way a lot energy you’ll be able to anticipate them to supply. It additionally touches on whether or not a 15kW system is an effective funding on your home or enterprise.
How many panels & how a lot roof house for a 15kW solar system?
A contemporary-day 15kW solar system might be comprised of between about 37-45 panels and would require about 75-90 m2 of roof house, relying on the wattage of the panels (that are usually between 330-400W every). This implies that for many properties, a 15kW solar system won’t be an possibility except it’s ground-mounted.
| 15kW Solar Panel Systems – roof house and variety of Panels | ||
| Solar panel watt score | 330W | 400W |
| Approximate variety of panels | 45 | 37 |
| Approximate roof space required | 75m2 | 90m2 |
How a lot does a 15kW solar system price?
Australia is home to a number of the lowest solar set up costs on the earth, and 15kW solar programs – due to their measurement – continuously supply a number of the greatest worth of any solar PV system measurement. You can view present indicative solar system costs on the Solar Choice Price Index (though 15kW is just not but a daily function in our month-to-month Solar PV Price Index, 10kW has been included for plenty of years now.)
According to Solar Choice’s personal information, as of March 2022 the typical price of a totally put in 15kW solar panel system in Australia is round $0.84 per watt – or about $12,600 after deducting the STC rebate and together with GST.
The chart under give a tough thought of what common costs for 15kW solar system appear like in (most of) Australia’s capital cities.
Average 15kW solar system prices primarily based on Solar Choice Price Index |
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| City | Out of pocket price (incl GST and incentives) | Cost per watt put in |
| Adelaide, SA | $12,000 | $0.80 |
| Brisbane, QLD | $12,000 | $0.80 |
| Canberra, ACT | $12,900 | $0.86 |
| Hobart, TAS | $15,600 | $1.04 |
| Melbourne, VIC | $12,150 | $0.81 |
| Sydney, NSW | $11,700 | $0.78 |
| Perth, WA | $11,400 | $0.76 |
| Average: | $12,600 | $0.84 |
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How a lot energy does a 15kW solar system produce?
Depending plenty of components, the precise power output of a 15kW solar panel system will range. These variables embody:
The desk under provides indicative figures for what number of kilowatt-hours of energy a north-facing 15kW solar system will generate per day (on common all year long) in Australia’s capital cities.
Indicative every day 15kW solar panel output by capital metropolis |
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| City | Average Daily Production | Estimated Annual Production |
| Adelaide | 58 kWh per day | 21,079 kWh |
| Brisbane | 60 kWh per day | 21,900 kWh |
| Canberra | 58 kWh per day | 21,079 kWh |
| Darwin | 66 kWh per day | 24,090 kWh |
| Hobart | 47 kWh per day | 16,973 kWh |
| Melbourne | 50 kWh per day | 18,341 kWh |
| Perth | 63 kWh per day | 22,995 kWh |
| Sydney | 54 kWh per day | 19,710 kWh |
Assumptions
- Calculations accomplished by way of PVWatts utilizing daylight information from the Bureau of Meteorology
- Conservatively assumes that the programs effectivity is 75%
- Assumes the solar panels a mounted at a 30 diploma angle to the north
Is a 15kW solar system proper on your home or enterprise?
As you’ll be able to guess by the quantity of roof house required, a 15kW is a critical quantity of solar for the extraordinary home – and in lots of circumstances it will likely be an excessive amount of. In most circumstances, it is going to solely be applicable when you’re utilizing over 50kWh of energy on common per day – a quantity more likely to use to a enterprise than a home. It might also be an excellent measurement selection for properties who’ve low electrical energy consumption and need to go off-grid (see: “Can I am going off-grid with a 10kW solar system?“)
Because of the complexity concerned (to not point out the associated fee) we advocate that you’ve the numbers crunched intimately earlier than deciding to go forward with a 15kW solar system. You can experiment with the numbers your self with our Simple Solar System Sizing Estimator, try our Solar Payback & ROI Estimator Tool or request a free, customised enterprise case evaluation from our engineering staff primarily based in your electrical energy payments.
Also remember that the Distributed Network Service Provider (DNSP) who’s the corporate who owns the poles and wires in your space could have explicit guidelines on what could be related and what programs are permitted to export power. Often for single part connections the restrict is a 5kVA inverter which might accommodate 6.6kW of solar panels.
An extra consideration is that most of the electrical energy retailers feed in tariff plans are capped at programs with a 10kW inverter. See a abstract of the most recent plans on this feed in tariff web page.
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Is a 15kW solar system price it?
These days solar feed-in tariff credit are a secondary profit from having a solar system put in. Instead, you’ll derive essentially the most worth out of your self-generated solar energy by ‘self-consuming‘ it – using as much energy as possible directly. Because solar feed-in tariff rates are generally lower than what you’ll pay for energy from the grid, the extra solar energy you utilize your self, the extra you’ll save; in the meantime, the surplus solar will stream into the grid and earn you credit which assist to cut back your general invoice.
Payback Period & IRR for 15kW solar programs
The desk under takes a take a look at payback occasions and inner fee of return (IRR) for individuals who set up a 15kW solar system in choose cities at two charges of self-consumption – 40% and 70%. Although these charges are excessive for many extraordinary households with solar (usually extra like 20-40%), we assume that anybody who goes forward with a system within the 15kW vary has performed their analysis and ensured {that a} greater diploma of their solar energy will go on to their native energy demand (versus into the grid). If you handle to attain even greater self-consumption charges, the returns will look much more beneficial.
Please notice that we’ve assumed that the system is eligible for a solar feed-in tariff – which will depend on the electrical energy retailer and the community guidelines.
Indicative payback durations for 15kW solar panel programs |
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| 15kW System Cost | Electricity Price | Feed in Rate | Self Consumption Rate | IRR | Annual Savings | Payback Period (Years) | |
| Sydney | $11,700 | 25c | 7c | 30% | 21% | $2,391 | 4.8 years |
| 60% | 31% | $3,516 | 3.3 years | ||||
| Brisbane | $12,000 | 18c | 5c | 30% | 15% | $1,840 | 6.4 years |
| 60% | 23% | $2,652 | 4.4 years | ||||
| Melbourne | $12,150 | 27.5c | 6c | 30% | 20% | $2,327 | 5.1 years |
| 60% | 31% | $3,655 | 3.3 years | ||||
| Perth | $11,400 | 28.8c | 5c | 30% | 23% | $2,522 | 4.4 years |
| 60% | 36% | $3,981 | 2.8 years | ||||
| Adelaide | $12,000 | 29c | 9c | 30% | 25% | $2,982 | 4.0 years |
| 60% | 36% | $4,228 | 2.8 years | ||||
| Hobart | $15,600 | 27c | 8.5c | 30% | 16% | $2,462 | 6.2 years |
| 60% | 24% | $3,627 | 4.2 years | ||||
| Canberra | $12,900 | 20c | 7c | 30% | 17% | $2,159 | 5.9 years |
| 60% | 24% | $2,984 | 4.2 years | ||||
| Darwin | $20,505 | 26c | 8c | 30% | 15% | $3,018 | 6.7 years |
| 60% | 21% | $4,150 | 4.8 years | ||||
Assumptions:
- Assumes the typical every day energy utilization is 50 kWh per day (very excessive for residential use)
- 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’ll be able to see are crucial to the monetary final result
Calculate indicative ROI & payback durations for 15kW solar programs
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