Rate of self -consumption, production, coverage, what difference

It is estimated that a self-producer housing consumes 30 to 50% electricity it produces. The higher it is, the less electricity you come from the public network so the more you Save on your invoices electricity !

How to calculate your photovoltaic self -consumption ?

Photovoltaic panels produce solar energy. It cannot be stored, but only consumed or sold to the network. The more this electricity is used, the higher the saving on the energy bill is important. This self -consumption can be improved thanks to certain devices. You still have to know them. But how to calculate your photovoltaic self -consumption ? See below.

What is photovoltaic self-consumption ?

It is the energy consumption produced by solar panels. There are 3 ways to use photovoltaic electricity production.

Total self -consumption of solar energy

In this choice, you consume all of the energy produced by photovoltaic panels. The little surplus is injected into the network without financial consideration. In this solution, a network connection is always necessary. It takes over and provides you with electricity when solar energy is not available enough. This is the example of the night when the sun is absent.

In the case of total self -consumption, photovoltaic installations must not exceed a power of 3kwc. This solution is regulated by the ISCSI or self -consumption agreement without injection of the surplus.

Partial self -consumption with sale of the surplus of solar energy produced

This is the most used solution today. Here you consume solar energy in priority. The surplus production is sold to EDF OA. As a historic supplier, EDF has the obligation to buy the electricity produced, but not consumed, to holders of photovoltaic panels.

The price applied in the event of energy buyback by EDF OA is determined by the decree of May 9, 2017. For an installation whose power does not exceed 9 kWc, you can count on 0.10 euros per kilowatt hour. Otherwise, the price is 0.06 euros per kilowatt hour.

This solution is advantageous for several reasons:

• Less dependence on electricity price increases;
• Better respect for the environment with renewable energy consumption;
• Economy made on the electricity bill with the resale of the production surplus;
• Beneficiary of the self -consumption premium with sale of surplus.

Sale of all solar energy production

In this case, you agree not to consume the electricity produced by solar panels. This total sales solution was popular a few years ago, because the rate of purchase of the surplus is attractive. But the continual drop in prices makes this option less attractive each quarter.

Between October 1 and December 31, 2020, the installations whose power does not exceed 3 kWc sell their electricity to € 0.1844 per kilowatt hour while those whose power is between 36 and 100 kWc see the price descend to 0 , € 1022.

Calculation of the photovoltaic self -consumption rate

The rate of photovoltaic self -consumption is an important indicator when you have solar panels.

Functioning of self -consumption

Solar energy is produced when there is sun. It must be immediately consumed. Otherwise, it is injected into the network. For this reason, it is not because you have a large surface of solar panels that your self -consumption is optimal.

Self -consumption rate or self -production rate

The self -consumption rate is the share of the solar energy consumed to heat or operate the electrical devices of the house compared to that produced by the photovoltaic panels. Its calculation formula is presented as follows:

(Solar electricity consumption/solar electricity production) * 100

Even if they are linked, this indicator should not be confused with the self -production rate. This indicates the share of electricity consumed provided by solar energy. Its calculation formula is presented as follows:

(Solar electricity consumption/total electricity consumption) * 100

For most accommodation, the self -consumption rate is between 20 and 30 %. This is little.

Example of calculation of the self -consumption rate

Take the example of total energy consumption over a year of 5000 kilowatt hours.

Solar energy consumption represents 2500 kilowatt hours. The self -production rate is 50 %. In this example, you have divided the amount of your energy bill by 2. To earn even more, you must increase this rate. To do this, the rate of self -consumption must be improved.

What conclusion draws from the self -consumption rate ?

You closely monitor your photovoltaic self -consumption. But how to know if your solar panels are profitable ?

Self -consumption: a fluctuating rate

The self -consumption rate varies all day.

Self -consumption is close to 100 % when you consume all energy production. It happens with cloudy weather or a strong need for electricity.

Self -consumption decreases when producing more energy than necessary. This is the case when there is a strong sunshine or little activity requiring electricity in the house at this moment.

Link between self -consumption and the power of the photovoltaic installation

The crest power, expressed in KWC, of ​​your installation is low. You are more likely to get a good self -consumption rate. However, your autonomy in energy produced is also low.

If your installation has greater peak power, it leads to more substantial energy production. Naturally, the self -consumption rate decreases in this case.

Conclusion

You have understood, for identical energy consumption:

• The higher the rate of self -consumption, the more efficient your installation. You can use the electricity of the network, the price of which is around 14 euro cents. In addition, you sell the surplus about 10 cents.
• If the self -consumption rate is low, you sell the solar energy produced at 10 cents, but buy more to the network at 14 cents.

How to improve your photovoltaic self -consumption rate ?

You want to improve the rate of photovoltaic self -consumption of your installation ? Here are some solutions to set up.

• Install a thermostat. Heating is launched when necessary and the temperature remains constant. This device avoids peaks in energy consumption in the evening for example.
• Install home automation on solar panels. It transmits you the production of solar electricity in real time. You can launch, even remotely, household appliances such as a washing machine, and enjoy this energy produced. In short, with home automation, consumption is adapted to production.

And you, what is your self -consumption rate ? How do you think you improve it ?

Rate of self -consumption, production, coverage, what difference ?

When you consider a self -consumption project for your accommodation, It is essential to make an estimate to find out different information such as the amount of the investment, the time of return on investment, the savings made, etc.

This essential information is calculated from three ratios which are:

What do they correspond to and what is their difference ? We will see it together.

Self -consumption rate, the largest

To estimate the gains and savings that self -consumption will make you achieve, we will first calculate the self -consumption rate.

The latter represents the share of the production of electricity produced by your solar panels which is consumed on site instantly.

It is calculated as follows:

Self -consumption rate = Production consumed on site / total production.

It is estimated that a self-producer housing consumes 30 to 50% electricity it produces. The higher it is, the less electricity you come from the public network so the more you Save on your invoices electricity !

How to improve your self -consumption rate ?

There are not 36 solutions but we have the one you need. To increase the self -consumption rate, you must take advantage of the periods when your solar panels work to run your most energy -energy equipment. For example, if you have a swimming pool, program the pump during the day, this will allow you to save. Also remember to program your washing machine or dishwasher ! All this equipment will be fed thanks to your production so not € 1 spent on the Enedis network !

Self -production rate, good to know

The self -production rate represents the share of electricity consumption which is produced instantly on site by your photovoltaic installation.

It is calculated as follows:

Self -production rate = consumption produced on site / total consumption

In other words, this rate reports between the share of your consumption from your own production and the total consumption of your accommodation. The higher it is, the more you consume your own electricity !

Note: the consumption produced on site is equal to the production consumed on site ! Do you always follow me ?

How to increase this ratio ?

There too the method is the same, it is necessary to operate as many equipment as possible when your panels work. To do this, there are self -consumption kits that allow you to control your objects at a distance and therefore have the Total control on operating hours. Thanks to these connected solutions, you can optimize your consumption according to your production so you Multiply the savings !

What about the coverage rate ?

It corresponds to the relationship between your annual production and your annual consumption. It is calculated as follows:

Coverage rate = annual production / annual consumption

This rate only allows you to make a energy balance. It does not in any case reflect the efficiency of your installation.

How to improve this ratio ?

By decreasing your overall annual consumption Essentially (think about turning off the lights out of a room, be careful not to waste too much hot water, etc.). It will be more difficult for you to increase your Annual production Because a large number of factors play in its favor (favorable weather conditions, orientation of the roof facing south, etc.) or against it (rainy weather, poor roof orientation, etc.) (Item Link Energy Performance of my Installation)

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