Case study: consumption of electric vehicles


Experimentation on electric vehicles




Electric vehicles hit a new record. The International Energy Agency released its annual report for 2016. Two million electric vehicles were on the road, a figure that is constantly increasing. Automobile industry constructors are all focusing their researches on developing more affordable electric vehicles. Meanwhile decision-makers are voting incentive measures to promote the use of electric vehicles (EVs).


We put our focus on the consumption of EVs. What if we could make those cars more affordable by optimizing their electric consumption? What if you had to spend less than 40€/month on charging your car ? That’s the challenge that we’ve tried to take up.


We’ve concentrated our researches on how to improve the charging process of EVs. It takes between 4 to 8 hours for an EV to be fully charged. And we know that people charge their EV when they come back from work, around 5PM. However, at that time, prices of electricity are very expensive, due to high demand. Plus, the transmission cost is higher during day time – 50€/MWh – instead of 29€/MWh during night time.


Our solution is to take advantage of price fluctuation to optimize EVs consumption. We have integrated a cloud in the car’s charger. The cloud is connected to the Nord Pool Spot , the energy stock-exchange of the Nordic area. Directly from the market, we collect prices of electricity every hour. Taking these elements into account, we’ve programmed the car to charge when prices are low. Let’s look closer at the experimentation.


Challenge: optimize the consumption of electric vehicles


car ev


Our experimentation was hold with the Mitsubishi MiEV in Tallinn. On the last six months period, going from September to March 2018, we calculated how much our solution could save money on energy cost. On those six months, the car was charged 40 times. We used the same optimization cloud as Themo thermostat. The technology is simple. The cloud receives real-time prices of electricity, which can fluctuate over 200% within a day. Then, the charger will consume when the prices are cheap, allowing to save money on energy bill. Let’s take a look at those savings on EVs!


We calculated that the car needed 4,2 hours to be fully charged.  On this basis, we calculated from 5PM to 10PM the charging cost for 40 days time period. The total cost of electricity car consumption reached 37,59€ VAT included. This result reflects the standard charging cost, without any optimization. We then made the same calculation, but with the optimization program. We took the prices during the night, between 1AM and 6PM, with night time transmission tariff. The total cost of electricity consumption was 23,14€ VAT included.


Therefore this experimentation allowed to save 38% on energy cost. It means that, on those 40 days of charging, a little bit more than one month, your charging expenses worth only 23€!


This experimentation shows us the potential savings that customers can make when taking advantage of price fluctuation. EVs are becoming more and more affordable with the progress of science, and our purpose is to bring high technology to people. With such an optimization, we make EVs more accessible to everyone.

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