A 15kW photo voltaic system for Kennards Rent in Rutherford, NSW.
15kW photo voltaic methods are an incredible system dimension for houses with excessive ranges of vitality consumption or companies with small to middling vitality wants – offered that they’ve ample roof house to put in one. This text takes you thru (nearly) the whole lot you would possibly need to find out about 15kW photo voltaic methods, together with how a lot house they take up, how a lot they price, and the way a lot vitality you may anticipate them to supply. It additionally touches on whether or not a 15kW system is an efficient funding to your dwelling or enterprise.
What number of panels & how a lot roof house for a 15kW photo voltaic system?
A contemporary-day 15kW photo voltaic system can 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 sometimes between 330-400W every). A typical residential photo voltaic panel is 1.7 metre by 1 metre. Because of this for many houses, a 15kW photo voltaic system won’t be an choice until it’s ground-mounted.
| 15kW Photo voltaic Panel Methods – roof house and variety of Panels | ||
| Photo voltaic panel watt score | 330W | 400W |
| Approximate variety of panels | 45 | 37 |
| Approximate roof space required | 75m2 | 90m2 |
How a lot does a 15kW photo voltaic system price?
Australia is dwelling to a few of the lowest photo voltaic set up costs on this planet, and 15kW photo voltaic methods – due to their dimension – regularly provide a few of the finest worth of any photo voltaic PV system dimension. You’ll be able to view present indicative photo voltaic system costs on the Photo voltaic Selection Value Index (though 15kW isn’t but an everyday function in our month-to-month Photo voltaic PV Value Index, 10kW has been included for quite a few years now.)
In accordance with Photo voltaic Selection’s personal information, as of March 2022 the common price of a totally put in 15kW photo voltaic 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 photo voltaic system seem like in (most of) Australia’s capital cities.
Common 15kW photo voltaic system prices primarily based on Photo voltaic Selection Value Index |
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| Metropolis | Out of pocket price (incl GST and incentives) | Value 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 |
| Common: | $12,600 | $0.84 |
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How a lot vitality does a 15kW photo voltaic system produce?
Relying quite a few elements, the precise energy output of a 15kW photo voltaic panel system will differ. These variables embody:
The desk under offers indicative figures for what number of kilowatt-hours of vitality a north-facing 15kW photo voltaic system will generate per day (on common all year long) in Australia’s capital cities.
Indicative every day 15kW photo voltaic panel output by capital metropolis |
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| Metropolis | Common Day by day Manufacturing | Estimated Annual Manufacturing |
| 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 through PVWatts utilizing daylight information from the Bureau of Meteorology
- Conservatively assumes that the methods effectivity is 75%
- Assumes the photo voltaic panels a mounted at a 30 diploma angle to the north
Is a 15kW photo voltaic system proper to your dwelling or enterprise?
As you may guess by the quantity of roof house required, a 15kW is a severe quantity of photo voltaic for the bizarre dwelling – and in lots of instances it will likely be an excessive amount of. Generally, it is going to solely be applicable in case you’re utilizing over 50kWh of vitality on common per day – a quantity more likely to use to a enterprise than a house. It might even be a great dimension selection for houses who’ve low electrical energy consumption and need to go off-grid (see: “Can I’m going off-grid with a 10kW photo voltaic system?“)
Due to the complexity concerned (to not point out the fee) we suggest that you’ve got the numbers crunched intimately earlier than deciding to go forward with a 15kW photo voltaic system. You’ll be able to experiment with the numbers your self with our Easy Photo voltaic System Sizing Estimator, try our Photo voltaic Payback & ROI Estimator Software or request a free, customised enterprise case evaluation from our engineering group primarily based in your electrical energy payments.
Additionally remember that the Distributed Community Service Supplier (DNSP) who’s the corporate who owns the poles and wires in your space could have specific guidelines on what could be linked and what methods are permitted to export energy. Typically for single part connections the restrict is a 5kVA inverter which might accommodate 6.6kW of photo voltaic panels.
An extra consideration is that lots of the electrical energy retailers feed in tariff plans are capped at methods with a 10kW inverter. See a abstract of the most recent plans on this feed in tariff web page.
Request a free photo voltaic enterprise case and evaluate main industrial installers
Is a 15kW photo voltaic system value it?
Nowadays photo voltaic feed-in tariff credit are a secondary profit from having a photo voltaic system put in. As an alternative, you’ll derive probably the most worth out of your self-generated photo voltaic vitality by ‘self-consuming‘ it – utilizing as a lot vitality as potential instantly. As a result of photo voltaic feed-in tariff charges are typically decrease than what you’ll pay for vitality from the grid, the extra photo voltaic vitality you utilize your self, the extra you’ll save; in the meantime, the surplus photo voltaic will movement into the grid and earn you credit which assist to cut back your total invoice.
Payback Interval & IRR for 15kW photo voltaic methods
The desk under takes a take a look at payback occasions and inside charge of return (IRR) for individuals who set up a 15kW photo voltaic system in choose cities at two charges of self-consumption – 40% and 70%. Though these charges are excessive for many bizarre households with photo voltaic (sometimes extra like 20-40%), we assume that anybody who goes forward with a system within the 15kW vary has completed their analysis and ensured {that a} increased diploma of their photo voltaic vitality will go on to their native vitality demand (versus into the grid). If you happen to handle to attain even increased self-consumption charges, the returns will look much more beneficial.
Please be aware that we’ve assumed that the system is eligible for a photo voltaic feed-in tariff – which is dependent upon the electrical energy retailer and the community guidelines.
Indicative payback durations for 15kW photo voltaic panel methods |
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| 15kW System Value | Electrical energy Value | Feed in Charge | Self Consumption Charge | IRR | Annual Financial savings | Payback Interval (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 common every day vitality utilization is 50 kWh per day (very excessive for residential use)
- The costs are primarily based on the most recent Photo voltaic Selection Value Index
- Self-consumption charges of 30% (low) and 60% (very excessive) have been chosen as examples solely and as you may see are essential to the monetary end result
Calculate indicative ROI & payback durations for 15kW photo voltaic methods
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