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How to determine the right system size for your rooftop Solar PV system

A 6.6kW solar power system is one of the most common system sizes that has become increasingly popular amongst the Australian population. The reason why a 6.6kW system size has rapidly gained interest across Australia is because of their affordability, ability to fit on most roofs and the ease of approval when it comes to connecting the system to the grid. If you’re considering a 6.6kW solar system for your household, then it is important to consider several factors to ensure that this system size is right for you. A 6.6kW package is more than enough to potentially reduce your energy bills up to 80-90% every quarter. If your residence is located in a place that enjoys decent sunshine and enough roof space for installing a 6.6kW worth of solar panels and your quarterly bills are under $500, then look no further! If you get your 6.6kW solar power system installed through Solar Power Nation you can be assured of premium, tier-1 panels that come with a 25-year performance warranty, a WIFI-enabled inverter that comes with a 10-year warranty, along with tailor-made, personalized solutions for both residential and commercial properties from our team of experts.

How many panels does a 6.6kW system require?

A modern-day 6.6kW solar power system using 370 watt (W) to 400W modules will consist of about 15-18 solar panels. This number has reduced a lot over the last decade. Solar panel companies keep making upgrades and advancements, introducing higher wattage panels which allows you to have a bigger system size on the roof using fewer solar panels. The most common solar panel size being solar currently in the Australian market are the 390W panels.

Does your roof have enough space for a 6.6kW system?

In terms of the space required on the roof for a 6.6kW solar power system, it is important to consider the average size of each solar panel and depending on the wattage of each panel, ensuring that the right number of solar panels can be installed on the roof ideally facing the north, west or the east direction to maximise solar production. Each solar panel generally measures out to 1.7m2, so the roof area required for a 6kW system will be about 30-36m2 – or possibly more depending on your roof design and whether you require tilt frames. It is also important to keep in mind that if you opt for tilt frames to install your 6.6kW solar power system, the solar panels are required to be spaced out more than panels mounted flush on the roof.

Why are 6.6kW systems commonly paired with a 5kW inverter?

Although your system may have 6.6kW worth of solar panels, don’t be surprised if the proposed inverter for your system is only 5kW when you begin receiving quotes from various solar companies. 5kW solar systems were previously one of the more common system sizes and were incredibly popular across Australia for a number of reasons. One of the reasons why a 5kW system was so popular is the fact that a 5kW inverter size is pre-approved for grid connection on basically every network across Australia, which means that 5kW inverters are much more common to come across than 6kW ones. Many of the 6.6kW solar systems on the market are therefore ‘overclocked‘systems with a 5kW inverter.

Solar panels rarely produce as much power as their rated capacity. Therefore, adding extra solar panels can help the inverter to run at a higher average efficiency. When the total capacity of the solar panels is greater than that of the inverter the panels are usually said to be “oversized” or the inverter “overclocked”. This is perfectly legitimate within Clean Energy Council guidelines, with benefits such as greater solar energy yields in early morning and late afternoon – even if ‘peak’ production is clipped back to 5kW during the middle of the day.

How much does a 6.6kW solar system cost?

The average 6.6kW solar system will cost around $2999 after the federal STC rebate has been deducted. The government rebates reduce each year so the deals you might score now won’t be available in a year or two. The price of solar systems do, however, vary widely across the Australian market. A more cost-competitive 6.6kW solar power system consisting of cheaper, low-end products will cost less, while premium solar brands will generally cost much more but will prove to perform more efficiently over a longer duration based on past performance.

Contact Solar Power Nation Today for a free quote and begin enjoying all the benefits that solar has to offer!

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