The higher the wattage of a solar panel, the more electricity it can produce. The output will also be affected by the conditions, such as where you live, the angle of the roof, and the direction your home faces. A 350W solar panel will produce an average of 265 kilowatt hours (kWh) of electricity per year in the UK.
We will also calculate how many kWh per year do solar panels generate and how much does that save you on electricity. Example: 300W solar panels in San Francisco, California, get an average of 5.4 peak sun hours per day. That means it will produce 0.3kW × 5.4h/day × 0.75 = 1.215 kWh per day. That’s about 444 kWh per year.
Though of course, if you have a solar battery, you can simply store the extra electricity and use it later. The average solar panel output per m² is 186kWh per year. Solar panels are usually around 2m², which means the typical 430-watt model will produce 372kWh across a year.
According to Statista, in 2023 UK solar panels generated an impressive 15,225 gigawatt hours of electricity. That means solar PV (photo voltaic) panels produced about 3% of the UK’s electricity last year. Now, that may not sound like much, but remember in 2004 the number of gigawatt hours generated by solar was just four.
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.
Just slide the 1st slider to ‘300’, and the 2nd slider to ‘5.50’, and we get the result: In a 5.50 peak sun hour area, a 300-watt solar panel will produce 1.24 kWh per day, 37.13 kWh per month, and 451.69 kWh per year. Example: What Is The Output Of a 100-Watt Solar Panel? Let’s look at a small 100-watt solar panel.