30/10/2026 | SOTELAN PLUS SL

A battery allows you to store some of the solar energy to use it later. But increasing self-consumption does not necessarily mean recovering its cost: before deciding, it is convenient to compare the investment with the additional savings it can provide.

At SOTELAN Plus we study each case. If your home has a grid connection, we evaluate your consumption habits and surplus compensation options before recommending a battery.

What a battery brings to your installation:

A battery stores some of the energy from your solar panels to use later, for example at night. Its capacity must be adjusted to the available surpluses and the consumption of your home.

If you are looking for electricity during grid outages, we need to check that the system has compatible equipment and is prepared to work as a backup. Adding a battery alone does not guarantee that service.

Lifetime of a lithium battery

Batteries progressively lose capacity over time and charging and discharging cycles. Temperature and conditions of use also influence its aging.

The manufacturer's warranty and service life are different concepts. To evaluate the investment, we must consider how the energy it stores can decrease over the years.

Does it pay off financially to install it?

The important thing is to calculate how much you would save More When adding the battery with respect to installing only the solar panels.

To do this, we compare its cost with the additional reduction of the bill, discounting the value of the surpluses that you would stop compensating and considering the storage losses. We also value the alternative of a virtual battery according to the conditions of your contract.

In this example, the additional battery savings are reduced against its cost, because the surplus energy would already have a value through the compensation of surpluses. That's why, Taking advantage of more solar energy inside the house is not necessarily equivalent to obtaining greater profitability. The result may change according to the price of the battery, your consumption schedules, rates and available aids.

At SOTELAN Plus we value these factors before recommending batteries for a photovoltaic installation in Lanzarote. If your home has a network connection and you are mainly looking to save, we first study a well-sized installation and the options of compensation or virtual battery. If your priority is to have electricity during the cuts, we also analyze the necessary equipment to offer that support. Our recommendation starts from what you need and the benefit you can get from the investment.