It’s 7:30 p.m. You get home, put away your coat, plug in the car and forget about it. You’ve done it like this every day since you bought the electric one. Until the electricity bill arrives and nothing adds up. The car doesn’t consume gasoline, yes, but something has gone wrong. That something has a name: you’ve been paying the most expensive electricity of the day to charge a battery that could have been filled for half the price while you were sleeping.
It’s 7:30 p.m. You get home, put away your coat, plug in the car and forget about it. You’ve done it like this every day since you bought the electric one. Until the electricity bill arrives and nothing adds up. The car doesn’t consume gasoline, yes, but something has gone wrong. That something has a name: you’ve been paying the most expensive electricity of the day to charge a battery that could have been filled for half the price while you were sleeping.
The 280 kWh error. Think of any family: apartment, refrigerator, washing machine, some heating. About 290 kWh per month. The day they park an electric car in the garage and start charging it at home, those 290 kWh become 570. The car adds about 280 kWh per month on its own, counting what is lost in the charging itself.
If they plug it in in the middle of the afternoon, they are paying for that mass of energy at the most expensive price of the day. The same amount of kWh can cost twice as much depending only on the time at which it is consumed. The key is no longer just how much is consumed, but when it is consumed.
The three traps. The first instinct when buying an electric car is to call the company and ask for more contracted power, for fear that the leads will trip if the car is connected with the washing machine running. Alejandro Diego Rosell, energy consultant and professoridentifies it as one of the most common and most expensive mistakes: oversizing the power means paying an unnecessary safety margin every month, even if you never use it.
But the thing doesn’t stop there. Many users believe that the regulated market (PVPC) is the safest haven. According to Sergio Soto’s calculations, energy expert Roamsa model household with an electric car would pay about 101.67 euros per month in PVPC, penalized by hourly volatility and increases in prices in certain sections. Cheap when the price drops, yes. But unpredictable when it rises, and rises just when it is most consumed.
And there remains the one that is most abundant in advertising and the one that deceives the most: EV rates. Rosell sums it up with a rule that should not be forgotten: “You are still saving 8 euros by charging the car and losing 15 in the rest of the house.” You have to look at the nightly price, but also what they charge during normal hours and what is in the fine print of the fixed term. Some EV rates offer a very cheap early morning to recover the margin the rest of the day. The name does not guarantee anything.
The roadmap. For the electric car to be truly profitable, experts propose following these steps:
- Apply the exact power formula: Rosell proposes a simple account: Necessary power = simultaneous consumption of the house + charger power + safety margin. If at dawn you have a refrigerator, water heater and air heater consuming 1.5 kW and you charge the car at 3.7 kW, you need about 5.2 kW in total. With a safety margin, you would hire 5.75 kW, not 10. And there is a nuance that changes everything: a smart charger can automatically reduce the car’s power if it detects that the house is consuming more. The car waits. The leads don’t jump.
- Play two powers: Current legislation (2.0TD rates) allows contracting a lower power for the day and a higher power only for the night (valley). This way you don’t pay all day for a power that you only use while you sleep.
- Escape from commercial trends: Faced with the avalanche of so-called ‘EV Rates’ (specific for electric vehicles), Soto warns that the most economical option is usually a well-optimized classic rate with three-period time discrimination (DH3). In a practical case, this rate would lower the bill to 74.90 euros per month, representing a saving of 26.3% compared to the regulated market. EV rates are still competitive (about 77.50 euros), but they can be slightly more expensive than a good DH3. To compare without trusting advertising: the official comparator of the CNMC and the hourly prices of the PVPC published by Red Eléctrica in ESIOS are the reference tools.
- Install a smart charger. A conventional plug is slow and offers no control. A wallbox allows you to program the load so that it starts on its own during the cheapest hours and adjusts the energy so as not to exceed the contracted power. Rosell places the cost of the equipment between 400 and 800 euros; Soto, adding the complete installation, between 600 and 1,500 euros depending on the case. Important: the wallbox does not pay for itself only by the kWh saved, but also by the control, security and comfort it provides. And the investment is significantly cut with the Auto+ Plan, which subsidizes up to 70% of the installation for individuals and up to 80% in municipalities with less than 5,000 inhabitants.
What if we collapse the network? With an increase in plug-in vehicle registrations which exceeds 44%it is legitimate to wonder if there will be blackouts when we all charge at dawn. Soto calls for calm: the problem is not that everyone charges at night, but that everyone does it at the same time and at high powers. With smart charging and distributed management, the grid holds up.
Rosell adds something more important for the long term: the “eternal cheap night” is not written in stone. If overnight demand grows uncontrollably, price signals will change. The smart thing to do will be to charge when there is less tension on the grid and more renewable energy available, which will sometimes be at dawn and sometimes at midday. “The electric car doesn’t just need a plug; it needs a brain.”
The next step: solar panels? If the wallbox is the first leap in efficiency, the photovoltaic is the second. Mandatory? “I wouldn’t say mandatory, but it is the step that most improves the equation if it fits your use,” Rosell responds.. The usual nuance: if the car is at work during sunny hours, it cannot always be charged directly with solar energy. But the surpluses generated by the installation offset the general electricity bill, and on weekends or teleworking days the advantage is direct.
The real change. In the end, the transition towards sustainable mobility hides a much deeper challenge than the simple fact of changing a combustion engine for a battery. As Sergio Soto perfectly summarizesthe big change is “to start managing home energy in a much more intelligent way.”
The electric car turns the family into an active consumer who not only cares about the amount of energy it uses, but also at what time, at what price and where it comes from. In the coming years, the real savings will be reserved for those who understand that blindly plugging in hurts today as much on the electricity bill as it hurt yesterday at the pump. You have to look at the clock.
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