If you’re trying to decide whether solar panels would be a good fit for your business or your home, you might be wondering exactly how much electricity you can expect these to generate. Well, there is no fixed figure, as this can change depending on a range of different factors.
What is a kilowatt hour?
A kilowatt hour is a unit of energy used to measure how much electricity is consumed or generated over a period of time. For example, a 1kW appliance running for one hour would use 1kWh of electricity.
Solar panels work in a similar way, with their electricity generation measured in kWh.
What does a solar panel’s kW rating mean?
If you’ve been looking for solar panels, you’ve probably noticed that they are usually advertised according to their power output, which is measured in watts (W) or kilowatts (kW). For example, a modern domestic solar panel might have a rated output of around 400W, which is equivalent to 0.4kW.
But this isn’t the whole picture. It’s important to be aware that such a panel would NOT generate 0.4kWh every hour. Instead, the panel will only reach this rated output under specific test conditions. In general, a typical 400W solar panel could potentially generate around 1 to 2kWh of electricity on a reasonably productive day. The actual amount of power generated will vary across the day, and the year, depending on a number of different factors, like the weather, amount of cloud, and the temperature.
What affects solar panel generation?
Electricity generation can be affected by:
- The panel’s power rating
- The efficiency of the panel
- The direction the roof faces
- The roof pitch
- Shading from trees or buildings
- Weather conditions
- The time of year
- The cleanliness and condition of the system
This is why two identical panels installed on different properties can produce different amounts of electricity.
Do solar panels generate more electricity in summer?
Solar panels do tend to generate more electricity during the summer months, which is mainly because the days are much longer, providing much more daylight hours in which to actively generate electricity.
However, you should note that solar panels can still produce useful amounts of electricity during autumn and winter. The amount of power generated will simply vary throughout the year depending on available daylight and weather conditions.
This is why it’s much more useful to consider annual electricity generation rather than focusing on the output of a panel on a single day.
How much electricity does a full solar panel system generate?
The total output of your solar installation depends on how many panels you have and the power rating of each one. For example, a system containing 10 panels rated at 400W would have a total capacity of 4kW.
As discussed above, that does not mean it will generate 4kWh every hour, as real-world output changes throughout the day. However, the system’s total capacity can be used to estimate its potential annual generation. A professional installer can provide a more accurate estimate based on your property.
Does roof direction affect kWh generation?
Yes. The direction and angle of your solar panels can have a significant effect on how much electricity they generate. If your roof has good exposure to sunlight it can provide stronger generation throughout the day, while shading or an unsuitable orientation may reduce output.
However, a roof does not necessarily need to face directly south for solar panels to be worthwhile. Different roof orientations can still produce useful amounts of electricity when the system is designed appropriately.
So, how many kilowatt hours does a solar panel generate?
There is no fixed amount of electricity that every panel will produce, as actual generation varies based on sunlight, weather, roof orientation, shading, panel efficiency and the time of year. A typical 400W solar panel may potentially generate around 1 to 2kWh of electricity on a productive day, depending on your location and weather.
For more information or advice, why not contact the experts today, here at the Eco Renewables Group? We work across the UK, from Oxford to Derby, to deliver high quality solar power solutions.
