SolarWide Pty Ltd, QLD, 4575

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6.6kW Solar Case Study

SolarWide Office - 6.6kW solar system

In 2019 we installed a 6.6kW quality solar system on our new office at Warana.

We now also have an additional 8kW Solar system and an LG Chem Resu 10h battery and a new secret battery and inverter system currently on trial for LG (more on that another day) but today we will discuss the 6.6kW system and what it has done in the last 12 months and why it is worth going to 6.6kW of panels instead of just 5kW even though the inverter is 5kW.

6.6kW systems are generally the go to standard solar system size that you see advertised everywhere. When we started business over 10 years ago it was the 1.5kW systems that were popular but the industry has developed, prices have reduced and solar has become much more affordable.

Most 6.6kW systems that you see advertised are 6.6kW of solar panels installed on a 5kW solar inverter. The reason for this is because adding panels is a relatively cheap way of increasing the solar production over the course of a day.

SolarWide - Sunshine Coast Solar Experts

As an example, if we look at yesterday (11/9/2021) our 6.6kW system produced 35.1kWh for the day but one of the staff has a 5.2kW system at home that produced 27.95kWh on the same day only 5 minutes away. Both systems haven’t been cleaned in a couple of years and both are installed using Fronius 5kW solar inverters.

Therefore the 6.6kW system produced an extra 7.15kWh (or about 25%) for the day just by having the higher panel capacity. As you can see in the images, the 6.6kW hit a peak of 5kW at about 11am and stayed there for about 2 hours but the 5.2kW system only hit a peak of about 4kW. The 6.6kW also generated more power sooner and stayed producing more power for longer.

As you can see from the 6.6kW system flat lining at 5kW for 2 hours, it never goes over the 5kW limit but overall it still produced about 25% more over the course of the day.

Having a higher panel capacity than the inverter capacity is called oversizing and is common practice within the solar industry. You can oversize an inverter with about 33% more solar PV than the inverters rating.

When we look at our 6.6kW system over the last 12 months it has produced 10,199.65kWh which works out at 27.94kWh/day which is great to see as when we quote a north facing, unshaded 6.6kW system we generally quote about 27kWh/day so it’s nice to back that up even further with real life evidence on our own solar system. And our own system is out performing expectation despite not being cleaned.

Are you considering a solar power system for your home or business? Whether it is 3kW, 5kW, 6.6kW, 8kW, 10kW, 15kW, 20kW, 30kW, 40kW, 75kW, 100kW, or even 500kW and 1MW of solar installation. You name it, we can do it. Contact us today and we can begin to build your new solar system together.

System Overview


3 Bearing Avenue, Warana, QLD, 4575

System Size

1 x 6.6kW solar system

Solar inverters

1 x Fronius Symo 5.0-3 5kW 3 phase solar inverter

Installation Date

August 2019

SolarWide, Sunshine Coast leading solar company, is highly accredited by many industry-leading brands and agencies.