<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=209258409501153&amp;ev=PageView&amp;noscript=1">
gblogowebbanner

Calculating How Much Solar Roof Area You Need

Posted by Chris Haynes, Guest Contributor

Aug 13, 2015 8:16:12 AM

One of the most common questions asked about solar panel installations is how much roof space you need to install the panels. Here's how to work it out.

solar-panels

There are a number of different things you need to know before working out the roof space required for solar panel installations.

First you’ll need to know the dimensions of the solar panels and the size of the system. Sometimes, when designing a solar system, you need to work out whether a landscape or a portrait orientation is needed. What you need to know first? The first things you need to know are:

1. The size of the system you are wanting to install

2. The type of solar panel (and the dimensions – you can get these from the solar panel datasheet)

3. The spacings between solar panels

4. The orientation of the panels. Once you have this information you can work out how much roof space is needed for your system.

Now you're ready. Here’s how you calculate the area required:

Size of the system (in Watts – e.g. 5kW = 5,000 Watts) ÷ Size of the solar panel (in Watts) = number of panels required Work out how many square meters each panel takes up.

For example, a panel which is 996mm wide and 1680mm long takes up 1.68 x 0.996 = 1.67 sqm. A 5kW system will be 20 x 250W solar panels which would take up 33.4 sqm. A little bit of space will also be needed in between each panel for fixing the panels to the racks—this will depend on what type of racking system is used.

Orientation

Which direction do your panels need to face? If you don’t have enough roof space on a single roof face, you can consider splitting your system into 2 different orientations. The best orientation for panels (in the Southern hemisphere) is North. East and West are slightly less efficient (around 9% less). South is around 20% less efficient so should be avoided when possible. If you split your panels between your East roof and your North roof evenly, you would only lose around 4.5% of your overall system capacity (in kW). Is there a minimum number of panels facing in one direction? Yes! This depends entirely on the inverter you choose. Most inverters will have a minimum voltage in order to work. The more panels in one “string”, the higher the voltage will go. Usually at least 6 panels will be needed to get the inverter functioning correctly.

About the Writer: Chris has been writing about solar energy Australia for many years. If you live in Australia, you can get 4 free solar quotes and make great savings.

Share This 
    

© 2020, Green Builder Media. All rights reserved. This article is the exclusive property of Green Builder Media. If you would like to reprint this content, you are free to extract a short excerpt (no more than 1/4th of the total article), as long as you 1. credit the author, and 2. include a live link back to the original post on our site. Please contact a member of our editorial staff if you need more information.

Connect with us on social media

facebook Instagram-logo1.gif twitter youtube linkedin pinterest 

Latest Blogs

New call-to-action
New call-to-action

New call-to-action

New call-to-action

2020 Green Home of the Year Awards

\\