Today we’re going to take a look at a real world example of an average 4kWp domestic PV system we have installed to understand what affects solar panel output, including factors such as weather, season, angle and orientation.
We’re going to put the batteries, EV chargepoints and hot water units to one side and consider a house with only solar panels fitted. The problem with this setup is that unless the energy is used as it’s generated, it will be exported. This means to get your best payback, you should switch on the dishwasher while it’s sunny, rather than at night.
To get the best annual output, your system would ideally face south at around 35 degrees. The height of the sun in the sky moves quite a lot over the year, so getting the best possible output will not be attainable without a very expensive and complex trackable mounting system. Generally it will always be a compromise on the roof space, orientation and pitch available to you.