Solar energy generation, measured in gigawatt-hours (GWh) versus installed solar capacity, measured in gigawatts (GW).
But since the average conditions in the UK are around 85% as good as STC, these panels will produce around 3,740kWh per year. This is more than enough for the average household, which typically uses 3,400kWh of electricity per year, according to government data.
Evaluating your energy usage will help you choose the right size solar power system for your needs. You won’t overinvest in panels but will still produce enough energy to cover your electric costs each month. Solar irradiance is the power per unit received from the sun. Essentially, it refers to how powerful the sun’s rays are.
When it comes to solar panels, 'power' refers to the maximum amount of electricity a panel can generate (in watts). The panel's ' efficiency ' is all about how effectively it can convert daylight into electricity. Higher power and efficiency mean greater electricity production.
To meet the UK government’s net zero target, the Climate Change Committee estimates that between 75-90 gigawatts (GW) of solar power will be needed by 2050. Analysis by Solar Energy UK indicates this would mean solar farms would, at most, account for approximately 0.4-0.6% of UK land – less than the amount currently used for golf courses
Solar panels are usually around 2m², which means the typical 430-watt model will produce 372kWh across a year. A solar panel system will need space on either side, so finding out your roof's area is only one part of working out how much solar electricity you can generate, but it's a great first step.