10kW Solar System Sydney
A 10kW Solar system in Sydney is becoming a ‘no brainer’ for larger households and businesses as solar power prices continue to fall and significant government rebates remain in place. The price of a top quality 10kW system with a European made inverter has fallen dramatically in recent years to under $10,000 fully installed.
There are a number of factors that need to be considered when installing a 10kW solar system, and installation costs can vary considerably. A large house, shed or barn roof will have very few if any additional installation costs, whereas an apartment building or ground mounted array may have additional costs including long cable runs, crane hire and site preparation such as clearing trees and laying foundations.
As a rough guide, 10kW systems start at under $10,000 for a good quality European made inverter such as Fronius or SMA, premium Chinese panels such as Trina Honey and a straight forward installation.
A top of the range system using high-efficiency 330W panels and Enphase Micro Inverter will start at roughly $13,000 and will normally be a little more depending on the site. We now sell over 80% of our solar systems using either Enphase Micro Inverters or the SolarEdge system with panel level output and monitoring. These systems can significantly increase output on shaded roofs, but are certainly not limited to unfavourable conditions. Find out more: The Benefits of Enphase Microinverters vs. String Inverter, Even on an Unshaded Roof.
There are also situations where we need to maximise output using a restricted roof area. In this case, we will need to use high efficiency panels such as the LG Neon 2 panels. This will increase initial outlay but will maximise returns over the life of the system.
10kW Solar System Details
10kW Panel Array: typically 38 x 270W panels or as little as 30 x 330W high-efficiency panels.
Inverter: 10kW with a maximum of 2 strings, or 2 x 5kW inverters with a maximum of 4 strings.
Mounting Kit: Solaray can design a mounting solution for almost all roof types. The two main exclusions are asbestos and slate roofs.
Estimated output: 14,235 kWh per year, or an average of 39 kWh a day.
Energy Cost Reduction: Multiply expected output by the cost of power per kWh to see how much you could save if you use all of the solar generated. This figure can be up to approximately $4,400 per year and will change depending on the price you pay for electricity.
With a possible return on investment of between 3 – 5 years, a 10kW solar power solution is now an attractive investment option for your home or business to significantly reduce your power bills and to run your home or business off renewable energy.
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10kW Solar System Output
According to the Clean Energy Council Guidelines, A 10kW solar system in Sydney will output around 39 kWh a day (averaged out across the year), outputting more on the longer summer days, and less in winter. It is important to understand that these 39 kWh of solar power will be produced during daylight hours, and typically as a bell curve as illustrated below. Depending on how much power you use during the day, typically you would want to have a quarterly power bill of over $1000 (at least approx. 40 kWh a day excluding any off peak hot water) to make good use of a 10kW system.
A solar system will peak when the sun is shining directly onto the panels, so for an array facing north this will be for approximately 4 hours during the middle of the day. You can see in the graph how shade from clouds immediately results in a drop off of solar power, and that in summer the system will continue operating until 7pm if you have the panels installed to catch late afternoon sun.
The most important point to take away from this example, is that a 10kW system will almost never reach it’s peak output. For that to happen, it has to be the right time of the day, the right time of the year, clear skies and not too hot. In this example, the system is installed on a tin roof with a very slight pitch of about 5 degrees. In Sydney, panels that are installed flat will be working at their peak efficiency during summer because the sun is so high in the sky.
We recommend that for larger systems the panel array is split into two strings of panels. The most popular option is to have one string of panels facing north and the other west of north. This helps distribute output into the afternoon, making it easier to use more of the solar power as it is generated. This is especially important for households with time of use billing, when the cost of power during the peak billing period of 2pm to 8pm can be up over 50 cents a kWh.
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