As you are aware, the sun rises from the east and sets in the west. During the regular tracking though, the sun moves towards the north, making north the best face to maximise your solar gain.

Another factor to take into account when optimising your solar gain is the season. As you can see in the diagram, summer’s solar gain is higher due to the positioning of the sun. In winter, the sun is further north however the angle is not as optimal compared to summer.

This being said, if you have northern facing roof space with out any obstructions such as trees or buildings, then you should opt to install solar panels there so that you are guaranteed the best solar gain.

Solar Gain and solar panel direct

Solar gain and solar panel directional losses

  • “You can also install solar panels on the east and the west facing front”

It’s not uncommon to have solar panels installed on the east or western front of your home or business. Although the solar gain is lower, the directional losses are not that great.

  • The solar panel directional losses for north east and north west vary from around 3% to 4%.
  • For an east or west facing roof, your solar gain loss will be around 12% to 18%

An experience solar installer or sales rep will be able to work out the most optimal solar panel direction and angle that will give you the highest solar gain to get the best return on investment. Although it’s not essential, it’s advised that you ask for a plan or design for your solar power system, outlining the options for installation and the exact location that the solar panels will be placed.


What if a sales rep or installer recommends that I install the solar panels on the south facing roof?

I suggest you get a second opinion. Honestly, it’s a no brainer! Unless of course you live in the northern hemisphere.


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Next: What time do solar panels work

    • The solar gain is higher in mid-day when the suns high up in the sky.


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