Annual electrical production of solar panels: what calculation? What about winter

If you want to set up a photovoltaic installation, you can make a simulation on our site.

What is the production of a solar panel in kWh for 1 m2 ?

Installing solar panels at home is to take a step towards the energy transition, while achieving significant long -term savings. However, it is not always easy to know how many kWh it can represent each year. We will detail here the average annual production, in kWh, 1 m2 of photovoltaic panel.

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Summary

How much energy produces a photovoltaic panel of 1 m2 ?

Average electricity production for 1 m2 of photovoltaic panel

Depending on certain criteria, which we will detail below, averages of production have been established at the national level.

We consider that a 1 kWC installation can produce between 900 and 1400 kWh/year. For a classic house that sets 3 kWc, or 8 panels of 375 WC, this therefore corresponds to an annual production of 2,700 to 4,200 kWh.

To obtain the annual production of each panel, we divide this quantity by 8, the number of panels. We deduce that each panel produces between 338 and 525 kWh/year.

The average surface of a solar panel is 1.6 m2. We therefore divide the annual production of each panel by its average surface to obtain production by M2. The result is 220 to 328 kWh produced each year per m2 of photovoltaic panel.

The criteria that influence electricity production

The electrical production of a solar panel depends on different factors:

• THE yield. This is the amount of light energy transformed into electricity compared to the amount of energy that has entered the system. The yield of monocrystalline panels is 16 to 24 % on average. That of polycrystalline panels is 13 to 18 %.
• LTilt Signs. Between 30 and 35 °, it is optimal.
• L’orientation. It is with solar panels turned south that the electrical production is the highest.
• There geographical area. The sunshine rate is not the same in the north of France as in the south. In general, production is therefore higher in the sunniest installations.
• The seniority of the installation. Over the years, photovoltaic panels have produced less and less electricity. The loss of yield is still quite low, even after 25 years.

How to convert kwc to kWh ?

Unfortunately it is not possible to convert Mathematically kWh in kWh. Indeed, the number of kWh produced depends on the different criteria mentioned above: the type of panels, the inclination, the orientation, the sunshine rate.

The most common way to convert consists of Use national averages Observed, namely around 900 kWh/year for 1 kwc installed in the north of France and 1,400 kWh/year for 1 kWc installed in the south.

The production of a solar panel for 1 m2 is therefore understood on average Between 220 and 328 kWh per year. However, if your panels are poorly oriented or inclined, the amount of electricity produced may be largely reduced. If you plan to install solar panels at home, do not hesitate to contact a professional, who can take care ofEstimate your forecast annual production Depending on your personal conditions.

What panel surface is necessary for 9 kWc ?

To know the surface of an installation of 9 kWc, you must first calculate the number of solar panels that this represents. If you choose a 375 WC model, then you need 9,000/375 = 24 panels. With an average of 1.6 m2 per panel, this represents About 38.4 m2.

Is it profitable to install solar panels ?

Installing solar panels is a profitable long -term operation. Indeed, even if the starting investment is fairly high, this makes it possible to Savings on invoices energy for many years. In addition, it is possible to sell your surplus or all of your production with an electricity supplier such as EDF.

Do solar panels produce at night ?

No, at present, solar panels can only produce electricity when the sun is lifted. Studies are underway to make panels capable of Create electricity at night. For the moment, the results are not encouraging enough to imagine marketing in the coming years.

Annual electrical production of solar panels: what calculation ? What about winter ?

What is the power of solar panels ?

Each solar panel with a unit power which can vary depending on the generation or the technology of this. In 2023, a standard dimension panel generally has a unit power between 375 and 450 WC for professional installations. These panels measure an average of 1.7 m².

Note: 1 Watt-Rête (1 WC) is a maximum theoretical power unit, in optimal conditions. For example, a panel of 400 toilets will generate a power of 400W maximum, and this in conditions of sunshine ideal. Today, the panels installed for professional projects (agricultural, community, tertiary or industrial) are at least 400WC, and can go beyond according to technology (and their unit dimension).

If you want to set up a photovoltaic installation, you can make a simulation on our site.

The energy production of a photovoltaic solar panel W/M2

To find out the production of a watt solar panel per m², we just have to do the following calculation: Divided power-head by surface of the panel. In other words, for a 400WC panel:

400/1.7 = 235.3 WC/m²

Thus, the power of a solar panel in watt-crests per m² (WC/m²) amounts to around 235.3 WC/m².

Example : If the roof of your store or hangar is a roof measures 850m² you can install up to 850 m² x 235.3 WC/m² = 200 005 WC or about 200 kW Crete.

Dimension of a panel

Power of a panel

The energy production of a photovoltaic panel in winter

A significant factor is the sunshine rate (calculated in WH/WC/year) or the sun irradiation rate (calculated in W/m²) which depends on your geolocation and the orientation/inclination of your surface exploited (parking roof or shade for example).

The rate used is an average year -round but we can still dissect it throughout the year:

Monthly distribution of horizontal overall annual irradiation in France