Why not buy batteries with solar panels?

In France, the solar sector is experiencing real success with 2,687 MW connected in 2021 and 14.3 TWh of electricity generation, which is 12.6% more than in 2020. According to ADEME and Jerema, the untapped potential in France is more than 1,100 GW.

In domestic use, the use of solar panel battery is strongly recommended to increase savings and move towards energy autonomy. However, adding a battery to store the energy produced by the solar panels can incur significant additional costs.

In this article, we will explore the advantages and disadvantages of installing a solar battery in addition to solar panels, as well as the features to consider when purchasing a battery.

Advantages of solar panel installation

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One of the main reasons why owners of solar installations add batteries is to make the most of the energy produced. When the sun shines solar panels produceselectrical energy that can be used immediately or stored in a battery for later use. It allows not using electricity from the national grid when the solar panels cannot produce enough power, such as at night or on cloudy days. According to experts, a solar cell installation can allow up to 80% self-consumption.

Disadvantages of solar panel installation

Despite the advantages mentioned above, solar panel installation also has disadvantages to consider. Above all, it represents significant additional cost, Between 3000 and 6000 euros. In addition, battery life is limited by time, an average of 10-15 years, after which it must be replaced. Therefore, these maintenance costs and replacement projections should be factored into the overall budget for the installation.

Features to consider when buying a solar cell

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Battery capacity is expressed in kilowatt hours (kWh) and determines the amount of energy the battery can store. It is important to choose the storage capacity of your battery according to your power needs. There is an average household battery capacity 7-10 kW/hwhich allows to provide electricity for about a day household consuming an average of 9.6 kWh per day.

Discharge rate

The discharge rate determines how much power you can use from the battery before it needs to be recharged. It is expressed as a percentage, and an 80% discharge rate is generally considered optimal for daily use.


A solar cell typically has a lifespan of 10-15 years, so it’s important to consider these long-term maintenance costs when purchasing a battery.

Deep discharge rate

It is important to check the deep discharge rate of the battery, it determines the maximum percentage of discharge of the battery before damage. A 50% deep discharge rate is generally considered a good choice.


It is very important to check the duration and conditions of the warranty provided by the manufacturer.

Financial assistance for solar panel installation

As mentioned earlier, purchasing batteries in addition to solar panels is a costly expense. Fortunately, there are a variety of options for getting financing for solar panel installation.

Homeowners who install solar arrays may qualify for a tax credit for eligible equipment costs. 30% of costs incurred.

Owners who carry out energy improvement works can benefit from the National Housing Agency (ANAH) bonus.part of the installation costs.

There is zero interest loans for individuals those looking to install renewable energy generation equipment, including solar panels.

  • Self-consumption premiums

There are bonuses for individuals willing to consume self-generated energy, often given by local authorities to encourage self-consumption.

It is important to check the conditions and eligibility criteria for these various financial aids before starting the solar installation. It is also interesting to note that resale of electricity Produced by your solar panels can also let you recover part of the installation costs.

Before making a decision, take the time to carefully study all available options and integrate them into your project’s profitability calculations. Note that financial assistance may vary by region and communityContact your local authorities to find out what options are available in your area.

Alternatives to storage batteries

There are alternatives to batteries for storing electricity produced by solar panels in homes.

  • Smart grid system

These are connected networks that can quickly detect where electricity is needed and send it there in real time. This technology is linked to 5G technology and also allows to optimize memory according to weather forecasts.

  • Virtual storage (virtual farm)

Virtual storage is an alternative to batteries for storing generated electricity. It allows electricity generated but not consumed to be allocated for later use. The storage is virtual, meaning it’s already plugged in and used by other people. So when you need energy, you can use the equivalent of what you previously produced for free.

In conclusion, installing a solar panel allows you to store the energy produced by your solar panels and use it at any time, even when the weather does not allow for optimal production.

However, this represents an additional investment in an already expensive setup, so it’s important to fully understand the benefits of this option before getting started. It is also important to consider the various financial aids available to reduce costs and to learn about the different options for reselling electricity to maximize savings.

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