How many solar panels do I need For a 5kw system?

If you’re eager to get a 5kw solar system operational, get ready for a bit of a collection effort – you’re gonna require 16 of those clever 320W solar panels.

16 panels x 320w = 5120w or 5.1kW.

They measure 170cm x 100cm and when set up together in an array they cover 27m2 of roof space.

16 solar panels needed for a 5kW System

Roof space required = 27m2

If you have limited roof space, you can go with higher quality 370W panels. In this case, you will only need 14 panels, saving you 54m2 of roof space compared to the 320W panels.

how many panels needed for a 5kW solar system

How much does a 5kw system cost?

The average price Australia-wide for a 5kW system is $6,034 installed. This price can vary depending on the state you live in as government rebates vary and the quality of the system you have installed.

The real price range is $5,719 – $6,309 across all states. If you are getting quoted a price higher than that I would shop around as there are probably better deals out there.

Please check our 5kW solar system cost guide for more details on prices and options.

This is what it would look like on a roof

5kw solar on roof

How much roof space do they need?

Here you can see that a regular 5kW system with 20 panels takes up 32m2 of roof space. Normally you would run them in two rows 10 panels on top and 10 on the bottom.

You can run them in different configurations and if you have an odd-shaped roof, you might be able to split them up into batches depending on the orientation of the various sections of the roof.

How much power will a 5kw generate per day?

On average, a correctly installed and well-oriented 5kW solar system has the potential to generate a minimum of 20kWh-22kWh per day.

The system is named 5kW because that is its peak capacity, typically achieved during 1-2 hours when the sun is at its zenith. While the system’s peak output is 5kW per hour, the total daily energy production depends on various factors, including weather conditions and the orientation of the panels.

It’s crucial to note that the actual daily production may vary, and achieving the maximum theoretical output may require optimal conditions and panel orientation. The importance of proper panel orientation cannot be overstated, as it significantly impacts the system’s overall efficiency.

What direction should they face?

It is advisable that the solar panels should face north all the time. This will ensure you get the maximum amount of sunlight on your panels with the natural swing of the sun through the sky during the day.

If you are unsure if your roof is suitable you can phone and speak to a local solar installer and ask them to check your roof. They will be able to go on google maps and check the orientation online.


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