charging an electric vehicle in hot weather
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Electric vehicle in hot weather – the impact on charging

Summer is just around the corner and the rising temperatures prompt us to ask how the heat affects electric vehicles. Long journeys at higher speeds combined with hot summer weather may heat up the batteries – but that’s not all. In anticipation of your upcoming journeys, we are taking a good look at this topic to give you a few tips on hassle-free driving and charging this summer.


How heat effects EV batteries

Battery overheating

As mentioned when we looked into the impact of cold weather on EV range, lithium-ion batteries don’t take kindly to extreme temperatures. In fact, they work best at temperatures of between 20 and 25°C.

The risk of overheating the battery is increased during the summer when you drive at higher speeds on long journeys. Beyond 45-50°C, the battery’s electronic components deteriorate more rapidly and a drop in charging performance is observed. Of course, the temperature range varies according to the EV model and the phenomenon will be more or less acute depending on the quality of your battery. 

If you want to look into this further, you can read our tips on maintaining satisfactory battery performance over time.

Impact on charging rate

electric vehicle connected to a charging station

As the battery approaches the point of overheating, the charging speed decreases. What happens is that the battery management system (BMS) adapts the charging rate to the temperature of the battery. To prevent overheating, the charging rate and charging time will be impacted to a greater or lesser degree.

In extreme cases, charging may even be halted for safety reasons while the battery cools down.

Battery cooling system

Having said that, depending on the cooling system on board your EV, your battery won’t be affected by heat to the same degree. Nowadays, many EV models boast highly efficient cooling systems that use cooling liquid. This is, for example, the case with some Tesla, Kia and Hyundai models to name but a few. 

Some vehicles, however, regulate the temperature of the battery via forced air cooling, which is less efficient. So think about checking what system your electric vehicle is equipped with and adapt your journeys in hot weather to take this into account.

Are charging stations affected by heat?

Yes, heat also has an impact on the electronic components in charging stations. Public charging infrastructures usually operate best up to temperatures of 50°C. And here again, we’re talking about charging stations offering the highest performance levels.

The heart of the problem lies with the fact that public charging stations are rarely sheltered. Today, most charge points located outside are not fitted with a roof or any protection against extreme temperatures. Some exceptions can be noted, such as charging stations on the Fastned network, which are fitted with a solar panel roof. These are becoming more widespread in France. 

Fastned charging station
Fastned charging station with solar panel roof

This means that, just like your electric vehicle, charging stations may limit the power rating delivered in hot weather.

What about the energy consumed by air conditioning?

turning on air conditioning in an electric vehicle in hot weather

Like most ICE vehicles, the use of air conditioning – especially in extreme temperatures – has a negative impact on range. 

As with the cooling system, it depends on how the air con is generated. The impact is lower for electric vehicles equipped with a heat pump with reversible air conditioning. This system is, moreover, becoming more widespread as it consumes less energy. It is the gateway to driving in pleasant conditions in both summer and winter without the stress of draining your battery. 

If your EV is equipped with a heat pump, the energy consumed by the air con system will be totally reasonable.

Our tips to avoid the stress of charging in sweltering conditions

plugging in an electric vehicle cable in hot weather

First and foremost, let us not forget the initial key phase of ensuring a successful e-journey – planning. To set off in the best possible conditions, don’t forget to plan your route using the Chargemap route planner.

Opt for sheltered charging stations or charge points located in underground car parks

As we mentioned earlier, charging stations are also sensitive to heat. It is therefore a good idea to go for charging stations fitted with a roof or located in underground car parks. The photos published by the Chargemap community on the mobile app will help you choose the best charge points.

A charging stop in a shaded environment will also be beneficial for your EV as it will be able to cool down more efficiently. Even without charging, parking in the shade or in a sheltered spot whenever you can will slow down wear and tear on your electric car.

If you are thinking about installing a home charging station, bear this in mind when you choose the location (either in your garage or a well-protected spot if it is outside).

Charge up early in the morning or at night

Along the same lines, it is a good idea to plan your journey so that you charge early in the morning or at night whenever possible. During heatwaves, this will help you benefit from more bearable temperatures for yourself, your EV and the charging station. A win-win combo!

Activate the air con inside your EV before setting off

To start your journey in the best conditions, you can pre-cool the cabin of your EV while it is plugged in. In this way, the air con draws energy from the grid rather than from the battery. You therefore start off with an ideal ambient temperature and keeping it at this level will require much less energy. An ideal solution to optimise the performance of your battery on a long journey. 

On most electric cars, you can programme the preconditioning settings for the temperature and the time the pre-cooling is activated, either via the dashboard or remotely using a carmaker app.

Ease off the accelerator

If you are a regular reader of our articles, you will know that this advice crops up very often. But a quick reminder never does any harm! Smooth driving rather than abrupt movements or racy driving is beneficial in all circumstances, but even more so during periods of extreme temperatures. Discover the tiny reflexes you can adopt to economise the battery of your electric vehicle. Every little helps and adding up an array of small habits can make all the difference in the long run 😉

We hope you have found this article informative and that you will now be able to travel by electric vehicle stress free – even in the hot summer weather. Please don’t hesitate to share feedback and your own tips on this topic in the comments. All that’s left for us to do now is to wish you a safe journey and happy charging as summer rolls in ☀️

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