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In Ceará, a electric car battery A 60 kWh battery, salvaged from a wrecked vehicle, became a kind of 440 kg “wall-mounted power bank,” integrated into a hybrid, off-grid solar system that practically powers an entire house.
The pilot project, installed in the metropolitan region of Fortaleza, shows how the electric car battery It can gain a second life as a home battery, reducing waste, cutting energy costs, and increasing home autonomy. At the same time, the case makes one essential point clear: It’s not a do-it-yourself project.This requires specialized engineering, standards that do not yet exist in Brazil, and great care with electrical safety.
The question that launched the project is simple and powerful: What happens to an electric car battery when the car runs out of power? Is it going to be thrown away or can it be reused?
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With the popularization of electric vehicles, many people fear that… electric car battery It will become an environmental problem.
It was precisely this concern that led the homeowner to seek a solution. second life of the battery.
He started searching for batteries in junkyards and in ads for wrecked cars, until he found a complete unit available for purchase.
The first experiment was with a battery of approximately 45 kWh, taken from a wrecked car. Later, the project evolved into the current battery, of… 60 kWh, also from a wrecked vehicle, purchased by R $ 19 thousand.
The idea has always been to prove that electric car batteries don’t need to end up in the trash.It can be converted into a home battery, functioning as an uninterruptible power supply (UPS) or power bank for the house.
Instead of buying a traditional solar battery bank, the owner decided to use a… electric car battery as the core of a hybrid solar system.
He compared costs. An equivalent battery, purchased as an off-the-shelf storage solution for a photovoltaic system, could cost between R$90 thousand and R$120 thousand, depending on the project.
The repurposed electric car battery, in turn, cost… R $ 19 thousand, which represents a very large reduction in the cost of energy storage.
It household battery It receives energy from its own solar power plant installed on the roof, with 36 photovoltaic modules.
During the day, the panels generate energy for the house. The surplus energy generated goes to the electric car battery, which is charged while the sun is strong.
With a fully charged battery, it powers the house overnight. Under normal conditions, A 60 kWh electric car battery can keep the house running all night.including air conditioning units, provided that consumption is managed.
In the event of a power outage from the utility company, the system allows for reduced usage of certain equipment and extends autonomy until the sun returns to recharge everything the following day.
In practice, the set functions as a off grid system Partial. The homeowner can, in many instances, live almost independently of the grid, combining a hybrid solar system, a second-life home battery, and using the utility grid only as a backup.
At the heart of the project is a high-capacity three-phase inverter, described by the owner as the brain of the entire system. It manages the energy coming from the solar panels, from electric car battery and from the dealership’s network.
The basic operation is as follows:
The house has approximately 14 air conditioning units, distributed across central VRV systems, in addition to other equipment typical of a high-consumption residence.
Even so, the electric car battery supports nighttime operation.provided that its use is managed judiciously.
One interesting point is that, despite all this structure, The electric car chargers in the house are not connected to the battery.They are powered directly from the utility company’s grid, for reasons of energy efficiency.
It wouldn’t make sense to charge a 60 kWh home battery only to then use that same energy to power a vehicle with a much larger battery.
The channel that presented the project itself issues an explicit warning: We do not recommend that anyone simply copy this installation at home..
The system works with approximately 440 V in direct current and 380 V in alternating current, in a three-phase arrangement.
This level of voltage and power is more than enough to kill a person. if there is a design or installation error.
Therefore, the project incorporates a series of mandatory and additional protections:
Furthermore, electric car battery it has its own internal brain, the BMSwhich controls the charging and discharging of the cells, monitors temperature, and ensures that everything stays within safety limits.
The inverter and the BMS communicate constantly, adjusting their operation to preserve the durability and integrity of the home battery.
The channel highlights that This type of connection cannot be made by someone without technical knowledge of electricity and high-voltage systems.According to the content itself, there are still no specific regulations in Brazil that address in detail this type of reuse of electric car batteries as household batteries.
To address the issue seriously, those responsible for the video say they sought a statement from the battery manufacturer, standardization bodies such as ABNT, and manufacturers of the equipment used in the installation. However, as of the time of publication, There was no official response from these brands and institutions..
Therefore, the project is presented as This is a real-life, experimental case, not a step-by-step guide for the public to replicate at home..
Even though it’s a pilot project, with some parts more expensive than the standard, the owner estimates a total investment of approximately… R $ 100 thousand for the entire installation, adding up electric car battery, inverter, solar power plant and protections.
At first glance, the price is daunting. But the context of the house makes a difference. The owner has… four electric cars and uses them all quite a lot.
The comparison is directly with the fuel consumption that would be achieved with combustion engine vehicles. According to him, The solar power plant paid for itself in about five months. simply comparing the cost of fueling cars with electricity instead of gasoline.
Last year, the reported savings on gasoline reached… around R$150 thousand, resulting from the intensive use of the four electric vehicles combined with the solar system and electric car battery repurposed as a household battery.
From an environmental point of view, the project is also a practical example of second life of the batteryInstead of discarding a wrecked car battery, the system transforms it into fixed storage, extending the useful life of the component and reducing the volume of waste generated before the end of the cells’ life.
At the same time, the channel itself reinforces that The second life of the battery is not yet a solution readily available to the general public in Brazil..
There’s a lack of norms, a lack of standards, a lack of clear safety protocols. The message is clear: it’s a promising idea, but still in its embryonic stage.
The case in Ceará shows that Yes, an electric car battery can be converted into a household battery., integrated into a hybrid solar system and even a partial off-grid system arrangement, with real gains in savings and autonomy.
But it also shows that this depends on serious engineering, adequate protection, and respect for technical limits.Not improvised.
Until clear rules and standardized procedures exist, each such installation will remain a bespoke project requiring expertise and responsibility.
Do you think that using electric car batteries as residential batteries in hybrid solar systems and off-grid systems will become a trend in Brazil, or are there still many safety regulations missing for this to become commonplace in homes?
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