What affects Solar Panels Yield?
More home owners have had solar panels installed in the last 2 years than in the last 10 years, according to statistics. Perhaps this is due to the rise in power costs over the last 2 years. Especially for South Australia, which now has the highest energy prices nation-wide.
However, many home owners have complained that even after installing solar panels, their electricity bills have not been reduced. Some even go as far to say their bills have increased!
Why is this so? Shouldn’t solar panels significantly reduce your power bill?
When Solar Panels Fail
In order for solar panels to fulfil their function effectively, a couple of conditions must be satisfied. Just like every other appliance, if solar panels are used inappropriately, they could function below full capacity, sometimes even at less than 50% yield.
Solar panel yield is measured in kWh. For South Australia, a 5kw solar panel system generates an average daily yield of between 15-18kwh. This could be slightly more, or significantly less, depending on how ideal your solar panel installation is. Let’s take a look at the factors that affects solar panels yield.
Solar Panels System Size
Solar panel system size obviously determines how much yield comes out of your solar panel system. The larger your system size in kW, the greater your daily yield. Each solar panel has a capacity of about 0.26kw. So a 5kw would typically come with 18-20 solar panels.
Depending on your available roof space, you may be able to fit more and go upwards of 5kw. For Adelaide, 5kw is the recommended system size due to the fact that cloudy skies often limit the amount of solar energy available each day for power generation. You’d get more in summer but for other seasons, when it’s cloudy or during the wetter months, you would get very low yield.
Solar Panels Facing
The direction you face your solar panels plays a huge role in how much power it can yield. The idea is to position your solar panels facing a direction that expose it the maximum amount sunlight each day.
For South Australia, that would be facing North. North is the best facing because, as the sun moves from east to west daily, you could be able to capture sunlight throughout the day – if your solar panels faced north.
If your solar panels faced east or west, you would only catch sunlight for less than half a day. So your yield is significantly reduced by 40-60%. South facing solar panels would also not be optimal given that we are in the southern hemisphere.
So when installing your solar panels, do check if your the longer side of roof faces north – or how many solar panels you fit on the north facing side. This is critical to your long term energy yield.
If you house is surrounded by tall trees or other taller buildings, then solar panels may not be of good use. Any obstruction that blocks the sunlight will impair your solar panel yield.
Make sure you check the direction and placement of your solar panels, and ensure there is nothing blocking the sun from hitting the panels.
If you meet all the above requirements and still do not see a good yield, you may wish to get your solar panel installer to double check the set up procedures, to ensure every thing is set up and configured correctly.
Need advice on solar panels installation?
Contact Rite Price Solar today at Sales Hot-line : (08)8343 5988