Forum user runs electric car and solar panels at home
Are solar panels worth it for charging an electric car? Real data: 757 kWh/year, 4,450 km, and the scheduling and cost problems.
English · Original discussion in Spanish · Published
Solar panels and electric cars: who does it really work for?
A recent calculation using real data shows that a 505 Wp solar panel installed in Spain generates about 757 kWh per year, enough to drive some 4,450 km annually in a small electric car. The figure sounds good on paper, but when working hours, weather and storage costs enter the equation, the dream of home solar charging fades for most people.
The paradox of sunshine hours
Anyone working away from home from 7:30 to 15:30 misses the peak solar generation hours. In summer they may still recover some in the late afternoon; in winter, night falls at 18:00. The car sits in the garage during daylight hours, but it doesn't charge because no one is there to plug it in. The apparent solution, a home battery that stores energy to charge the car at night, introduces a money pit that stretches the payback period beyond reason.
The real cost of energy independence
The most realistic analyses suggest that the panels-plus-electric-car combination only makes economic sense for very specific profiles: remote workers who have the car at home during the day, or people in high-irradiance areas who can install panels without red tape, DIY-style and without feeding into the grid. Trying to sell surplus power to the grid at €0.05/kWh and then buy it back at €0.25 is ruinous, as the "lonchafinista" strategy of installing off-grid rightly points out.
Storm clouds on the horizon
Profitability collapses when real factors appear: 60% cloudy days in northern Spain, the need for frequent panel cleaning, seasonal declination, and expected electric car battery failures. A user who drives 300 km a week to work faces installation costs that are unlikely to be recovered before the components reach the end of their useful life.
The question left hanging is whether the energy transition is designed for the average citizen or only for a minority with a detached house, remote work and capital for long-term investments. The data in the debate suggest that, for most people, combining panels and an electric car remains an unaffordable luxury, not a real solution.
Related forum debates
A recent calculation using real data shows that a 505 Wp solar panel installed in Spain generates about 757 kWh per year, enough to drive some 4,450 km annually in a small electric car. The figure sounds good on paper, but when working hours, weather and storage costs enter the equation, the dream of home solar charging fades for most people.
The paradox of sunshine hours
Anyone working away from home from 7:30 to 15:30 misses the peak solar generation hours. In summer they may still recover some in the late afternoon; in winter, night falls at 18:00. The car sits in the garage during daylight hours, but it doesn't charge because no one is there to plug it in. The apparent solution, a home battery that stores energy to charge the car at night, introduces a money pit that stretches the payback period beyond reason.
The real cost of energy independence
The most realistic analyses suggest that the panels-plus-electric-car combination only makes economic sense for very specific profiles: remote workers who have the car at home during the day, or people in high-irradiance areas who can install panels without red tape, DIY-style and without feeding into the grid. Trying to sell surplus power to the grid at €0.05/kWh and then buy it back at €0.25 is ruinous, as the "lonchafinista" strategy of installing off-grid rightly points out.
Storm clouds on the horizon
Profitability collapses when real factors appear: 60% cloudy days in northern Spain, the need for frequent panel cleaning, seasonal declination, and expected electric car battery failures. A user who drives 300 km a week to work faces installation costs that are unlikely to be recovered before the components reach the end of their useful life.
The question left hanging is whether the energy transition is designed for the average citizen or only for a minority with a detached house, remote work and capital for long-term investments. The data in the debate suggest that, for most people, combining panels and an electric car remains an unaffordable luxury, not a real solution.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (29 replies).
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