As power prices continue to rise, households across NSW are installing larger solar systems to cover as much of their power consumption as possible with solar. Let’s have a look at a few of the key numbers of a 7kW solar power system including the price, to see if a 7kW solar system will be a good fit for your household.
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Price of a 7kW Solar System
A good quality 7kW solar power system starts at a bit under $8,000 fully installed, or around $165 a month over 5 years including a European Made inverter such as the Fronius Symo, premium tier one solar panels such as Trina Honey 275W modules and a standard installation (ie. no cherry pickers etc.).
It is important to note that with solar panels you generally get what you pay for, and most of our customers choose high-efficiency panels from manufacturers such as LG Solar. It is possible to find a cheaper 7kW solar system for under $8,000, however, this will typically require buying low to mid-range panels manufactured in China, and often without any after-sales support.
For a larger residential system it is important to maximise reliability, output and of course longevity, and so spending a little more upfront can save you a lot of money over the life of the system. Solaray service full-replacement warranties and include full technical support. This gives our customers the peace of mind that if something goes wrong you will be looked after.
As a rough guide, a 7kW system can save you up to around $3,000 a year on your power bills. Of course, to save over $700 on a quarterly electricity bill you are going to need to use a lot of power during the daytime – as much as 35 kWh during the daytime over summer. If you are able to get the most out of your 7kW system, you could spend up to $14,000 and get a top of the range system with a return on your investment in as little as 4-5 years!
Output of a 7kW Solar System
According to the Clean Energy Council guidelines, a 7kW solar system in Sydney facing north will produce an average of 28 kWh a day, outputting more power in summer and less in winter. We have found that this guideline is a conservative estimate and that by using the top brands you can get considerably more out of our system, for example, our Enphase systems give our customers on average 110% of expected output. On an average day in summer, a 7kW system will give our customers around 35-40 kWh of power. Because this can be too much power for many households, we often recommend considering battery storage so that any excess solar power can then be used during the evening.
 
A 7kW Solar System - The Key Numbers
| 7kW System | |
|---|---|
| Number of Panels | From 22 x 330W Panels to 26 x 270W Panels |
| Output | 28 kWh a day average (see below) |
| Potential Savings | $600 – $750 a bill depending on your cost of power |
| Average Payback Period | 3 to 5 years |
| Cost | From around $8000 to around $14000 for a good quality system and customer support |
| Repayments | From around $165 a month over 5 years* |
| Suited to | Medium to large homes using on average around 28 kWh a day during the daytime (or over 24 hours with battery storage) |
* Repayment numbers are an estimate based on a 5-year term. 3-7 year terms available. More information is available here: Solar & Storage Finance
How much will a 7kW solar system save me?
The potential savings of a 7kW solar system depend on how much solar power you are able to use in the home at the time of generation. You will typically save around 28 to 35 cents a kWh (depending on how much you pay for your power), and depending on your retailer you will be paid around 5-12 cents a kWh for the power you send back to the grid. A 7kW solar system can save you up to around $600 to $750 per quarterly bill.
More information is available here: How Solar Power Reduces Your Power Bill
* This example assumes a cost of electricity of 28 cents + GST, an average output in line with the guidelines from the Clean Energy Council, and a feed-in tariff of 12 cents per kWh.
Number of solar panels for a 7kW System
The larger the system, the more important it is to buy quality panels to ensure you maximise reliability, increased output in all weather conditions and the longevity of the system.
The other consideration is roof space. By installing high-efficiency panels, we can use 22 x 330W panels instead of the standard 26 x 270W panels.
7kW Micro Inverter System
Solaray is the largest and most experienced installer of Enphase Micro Inverter systems in NSW, and our system design team are experts at putting together a solar array that will maximise solar output in all conditions.
The main benefit of microinverters is that each panel is independent of the others, making it possible to design an array across different orientations and at different angles. A common panel layout is to have some panels facing north, and the others west to spread the output of solar power across the day, making it easier to use more of the solar power as it is generated. Having panels west is also advantageous if you are on time of use billing, where households typically pay around 50c per kWh between 2 pm and 8 pm for power on weekdays.
Find out all you need to know about Enphase: 10 key benefits of micro inverter systems.
7kW Solar System on a House With Single Phase Power
In some circumstances, it is now possible to install a system larger than 5kW on a house with single-phase power in NSW. SolarEdge and Enphase solar systems now allow us to limit the amount of power your system sends to the grid to 5kW. This means you are no longer strictly limited to a 5kW solar system. Here are a few options that we would be happy to talk to you about in more detail depending on your location and your specific requirements:
- We can install a single phase string inverter up to 5kW with a 6.5kW array of panels. A well-designed solar system can save you thousands of dollars and significantly increase output by oversizing the panel array by up to 30% of the inverter’s rating. Find out more…
- If you are interested in Enphase, we can install 21 x S230 (4.83kW) Microinverters, or 18 x S270 (4.86kW) Microinverters to stay under the 5kW limit. By over-sizing the Enphase micro inverters, you can install a significantly larger solar array than 5kW with, for example, 21 x Trina Honey 270W panels for a 5.67kW array, or 18 x LG NeON 2 330W panels, for a 5.94kW system. More information is available here…
- If you are using a lot of power during the daytime, or you are considering a large solar battery such as Tesla Powerwall 2, revolutionary SolarEdge technology has completely changed the game for single phase houses in NSW. Up until recently, we could only install a 5kW system, however, thanks to export limitation we are now able to use the SolarEdge 7.3kW single-phase inverter and limit the amount of excess solar power that is sent out to the grid. This allows us to install a 7kW solar array, powered by the 7.3kW SolarEdge inverter. More information is available here…
Solaray are the Solar & Storage Experts in NSW. Request a callback today for more information and personalised pricing:
Vanya
Hi. I have a system comprising 6.5kw of panels (ea panel about 327 w) and a Frontius Inverter (5kw). I am considering upgrading the system. I was wonder if you sell and install the larger Frotius inverters and if you would review panel set up and advise on whether more panels could be added?
Solaray
Hi Vanya, yes, we install the larger Fronius inverters. Please give us a call on 1300 221 586, we would be happy to help.