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Solar panels yield per day

We understand that you want to know what you can expect in terms of solar panel performance per day. In fact, many of our customers want to know: what is the performance of solar panels today? What solar panels generate depends on, among other things, their location, the number of panels, and the power per solar panel. Calculating the expected performance of solar panels per day in kWh is very simple.

Example of calculating average daily performance of solar panels

With a package of 10 solar panels of 365 Watt peak (High Power) you generate about 3103 kWh per year. We calculate average daily yield as follows: maximum solar panel power in peak watts x 0.85 = expected annual yield in kWh, divided by 365 days. The power of 10 solar panels is 3650 Wp. The factor 0.85 is a good average for roofs in the Netherlands.

The average daily performance of your solar panels is then: (3650 x 0.85) / 365 = 8.5 kWh.

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Solar Panel Output: How Much Electricity Do They Produce?

Investing in solar panels can be daunting if you’re unfamiliar with the lingo: there are a plethora of specific definitions of solar energy, energy is measured in many ways, and don’t get us started on consonant-filled robotic panel names. .

Solar panel output can also fall into this daunting jargon group, but we’re here to make things easy for you.

We’ve put together everything you need to make sure you get the right amount of power from your panels.

If you’re already familiar with all things solar, why not dive in and get a quote for a new solar panel system?

Solar panel output power

Let’s start with the basics: the power of a solar panel is expressed in watts   . On average, a home solar panel is rated at around 265 watts, though it can range from just 225 watts to over 350 watts.

The higher the power of a solar panel, the more electricity it can produce under the same conditions.

To calculate how much electricity a solar panel will produce in a day, all you need to do is multiply the power by the number of hours of sunshine.

For example, a house in Cambridge typically receives four hours of sunshine per day. If this house has a 280-watt solar panel, it will generate 1,120 watt-hours (Wh) or 1.1 kilowatt-hours (kWh) of electricity (280 x 4) that day.

If that same house had a 320-watt solar panel, it could produce 1,280 Wh or 1.2 kWh of power (320 x 4) that same day.

How much energy does your house need?

This all depends on two things: how much electricity you use and what part of your home you want your solar panels to power.

If your home has a particularly high power consumption, or you want to rely solely on solar panels to power your home, we recommend getting solar panels with a high power rating, around 300 watts (per panel) or more.

However, if you don’t use a lot of electricity on a daily basis, or just want solar panels to subsidize some of your home’s energy use, you can opt for lower-wattage solar panels, around 225 to 275 watts.

Most homes will install multiple solar panels, also known as a solar panel system. A typical 3 to 4 bedroom home requires a 3 to 4 kW solar panel system, typically comprised of 12 to 16 solar panels.

The efficiency of a solar panel system can be calculated by multiplying the power of each solar panel by the total number of solar panels. For example, a home in Reading with four 250-watt solar panels would have a 1-kilowatt (kW) solar system (250 x 4).

Most homes have a solar panel system ranging from 1 kW to 4 kW depending on how much power they need and the size of their roof.

How much energy does a solar panel produce?

Typically, a 3kW or 4kW solar panel system will produce enough power for a 3-5 person family home, while a 1kW or 2kW solar panel system will be just the right size for a couple or single resident.

To give you an idea of ​​how much electricity solar panels can generate, the table below shows how many hours a selection of appliances can use, based on how much electricity different solar panel systems produce in a year.

If conditions are not ideal, the efficiency of your solar panels will suffer, preventing them from operating at their full power.

There are several factors that can affect the amount of electricity a solar panel can generate. Included:

Direction and angle of your roof

A solar panel works best when placed on a roof facing south at a 35-degree angle. However, solar panels can still produce a decent amount of power on a roof facing east or west, and at an angle between 10 and 60 degrees.


Make sure your solar panels are installed out of the shade, in direct sunlight. If only a small amount of shade covers a solar panel, it can significantly reduce the amount of electricity it can generate.

time of year

A solar panel will produce more power in the summer months when the days are longer and there are more hours of sunshine. However, if it gets too hot, the solar panels can overheat; at temperatures above 25°C they generate much less energy.


Make sure to clean your solar panels regularly with a damp cloth and soap. If a solar panel is covered in dirt, the power will drop because sunlight cannot reach the panel. Although it rains a lot in the UK, don’t trust it to rain dirt.

How do you know how much electricity your solar panels generate?

Your solar panels come with a   meter   placed in an accessible location in your home. This meter records the amount of electricity produced by your solar panels.

Some solar brands are also introducing online monitoring tools, meaning you can see how much power your solar panels are generating with the click of a button on your computer or phone.

Since solar panels   are virtually maintenance   -free, you can easily forget about them once they’re installed on your roof. However, we recommend that you check them regularly to make sure they are clean and in good condition.

It’s also worth checking your meter regularly to make sure it’s putting out the expected amount of power. If the power from your solar panels is particularly low, it could be a sign of a problem.

How many kWh does a solar panel deliver per day?

The performance of solar panels per day is influenced by three factors: the number of hours of sunshine, the orientation and the angle of inclination. The performance of a solar panel is expressed in peak watts (Wp). However, keep in mind that a 325Wp solar panel will never actually produce 325Wp, as the performance of solar panels per day depends on the above factors. Below you will find the answer to the question how many kWh does a solar panel deliver per day?

The calculation of the performance of the solar panels per day is carried out using the following formula:

Total power in Watt peak (Wp) * Irradiance factor = performance in kWh

The total power of a solar panel installation is easy to calculate by multiplying the number of solar panels by the number of Wp per solar panel. This is how the potential solar energy is calculated. The irradiance factor, on the other hand, depends on several factors as mentioned above: the number of hours of sunshine per year, the orientation of the solar panels and the angle of inclination at which they are located. At we use special software that takes all these factors into account in one calculation, but in the Netherlands it is common to use a standard average of 85% or 0.85.

In short, with these two variables you can calculate the performance of your solar panel installation:

Total power:  325Wp  * Irradiation factor:  0.85  =  276  kWh

So a 325 Wp solar panel will provide an average of 276 kWh. To find out how many kWh per day the solar panels produce, divide the answer above by 365 days. It is also good to know that an annual consumption of 3,400 kWh is used for an average home. This means that, under the right circumstances, we need 13 solar panels to cover this consumption.

Summary performance solar panels

solar panels 12 solar panels
Yield  per  day €3.30 €5
Income  per month €100 €150
Yield  per  year €1,200 €1,800
18 jun 2020

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