EV Charger + Batería doméstica: Smart Charging with Solar Power

Why combine EV charging and a batería doméstica?

An increasing number of Dutch hogares have both paneles solares and an coche eléctrico. The logical next step is a batería doméstica to optimally connect the two. Why? Because your EV is typically parked at home in the evening or at night for charging — precisely when your paneles solares are no longer producing.

With a batería doméstica, you store the surplus solar power during the day and use it in the evening to charge your car. The result: free driving on solar power. In this article, we explain how it works, what it costs, and how much you can save.

How does the combination work?

The system works as follows:

• During the day: your paneles solares generate electricity. Whatever you do not use directly goes to the batería doméstica.
• Late afternoon: the battery is full. Any additional surplus is exported to the grid.
• Evening: you arrive home and plug in your EV. The batería doméstica supplies power to the charging station.
• Night: once the battery is empty, the system switches to grid power. With a tarifa dinámica contract, you then charge at the lowest overnight rates.
• Smart management: the gestión energética system automatically distributes the available power across the hogar, battery, and charging station.

Load balancing: smart distribution

A crucial aspect of the EV + batería doméstica combination is load balancing. Your hogar connection (typically 1x25A or 3x25A) has a limited capacity. If you are simultaneously cooking, running the washing machine, and charging your EV, you could trip the fuse.

Dynamic load balancing

Smart charging stations measure in real time how much power your hogar is consuming and automatically adjust the EV's charging power. When you are cooking (3 kW), the charger reduces from 7.4 kW to 4.4 kW. The batería doméstica can provide additional power as a buffer, so your EV charges faster.

Solar charging mode

Many smart charging stations offer a solar charging mode: the EV charges exclusively on solar power. Combined with a batería doméstica, this becomes even more effective: the battery absorbs fluctuations (clouds) so the charging process is not constantly interrupted.

How much do you save?

The savings depend on your driving habits, the number of paneles solares, and the capacidad de la batería. Here is a realistic overview:

With the combination of paneles solares, batería doméstica, and EV charging, you save up to €1,300 por año on charging costs. The batería doméstica contributes by making solar power available at the moment your car arrives home.

Choosing the right setup

For an optimal EV + batería doméstica setup, we recommend the following:

• Capacidad de la batería: at least 10 kWh if you drive 30+ km daily. A full car charge requires 15–30 kWh, so you need sufficient buffer to also power your hogar.
• Paneles solares: at least 14–20 panels (6–8 kWp) to generate enough surplus for both home and car.
• Smart charger: choose a charging station with dynamic load balancing and solar charging mode (e.g. Easee, Alfen, or Wallbox).
• Tarifa dinámica contract: for nights and cloudy days when you still need grid power.

Real-world example

Take a family with 16 paneles solares (6.4 kWp), an Anker SOLIX X1 with 10 kWh battery, and an coche eléctrico that drives 15,000 km por año. Annual production is approximately 5,600 kWh. The hogar consumes 3,500 kWh and the car 3,000 kWh (6,500 kWh total). Without a battery, 60% of the solar power would be exported to the grid.

Conclusion

The combination of an cargador de VE and batería doméstica is one of the most profitable energy setups you can achieve as a homeowner. You drive largely on free solar power, save up to €1,300 por año on charging costs, and are less dependent on the energy grid.

Want to know which batería doméstica best suits your EV setup? Request free advice or browse our high-capacity batteries.