If you want to charge an electric car at home, you should know that…


Recharging at home is a great advantage of the electric cars, both for convenience, as by cleaning and costs

electric cars can be charged at any plug that has a certain technical characteristics (starting with earth), but there are some small considerations to take into account. The more fast we want it to be to load, the more there is to delve into technical issues.

If we have a single family dwelling with a private garage, we will probably have a shot with 10 amps, which would give a maximum of 2.3 kW power. Before continuing, it is worth recalling a basic formula concerning electricity:

P = I x V, or power is equal to the product of the intensity (in amperes) by the voltage

For example, with 16 amps and 230 volts leave us 3.680 watts, or 3,68 kilowatt (kW). The speed at which you are charging an electric car depends on the load power, and this in turn on the intensity, since the voltage is “constant”.

, If you have a power of 3,68 kW, it means that each time we will be able to recharge a little bit less of 3,68 kW, since there is to look at some – small losses in the process. For each full hour, is multiplied. In 10 hours we will have uploaded something less of 36.8 kW. Simple, right?


electric cars can have a small charger for occasional use, or a specific connector for charging points designed for that purpose. In some cases, the charger occasional use is sold separately and is not included in the equipment.

The charger occasionally is not as fast as the specific, and it can work really slowly. For example, if it works out to 6 amps, we would need 12 hours to get to 16 kW. If we talk about the Nissan Leaf with larger batteries (30 kWh), in those 12 hours not recargaríamos or half, but would for something more than 100 miles of autonomy.

it is ideal to have a charging point specific, with 16 amps and 3,68 kW of power

Depending on the installation, there will be needed more or less work and modifications in the electrical circuit. The thickness of the cables, for example, is a factor to be taken into account. The regulation that governs all of this is called TC-BT-52 of Regulation Electroténico Low Voltage, approved last year. All installations must be performed by qualified personnel, it is not something that you can make one by going a couple of afternoons at IKEA.


The charging points fast and supercargadores not have been intended for home users due to its high cost. Its purpose is to solve problems of mobility point, they are not for regular use and continued

we Can install a charging point in garage collective, informing in writing to the president of the community, as defined by Law 19/2009, of measures to promote and expedite proceedings of the rent and the energy efficiency of the buildings. In the event that you need a counter side, it is necessary the approval of the community of owners as well.

Depending on the case of each, install a separate counter (sometimes with a second contract) or will be derived from the main counter, a line to the charger. It is advisable to take advice from a qualified electrician, because this type of facility will only be able to make them. The cost depends on what to do in each case.

In any case, the community of neighbors will assume such costs

at The margin, consider the cost of the own charge point, depending on their power, security measures, and types of connectors. The most basic have connector Schuko (which there are in any home), connector european Mennekes (or type 2) and the Yazaki (or type 1). An approximate price is between 500 and 1,500 euros.


sometimes, we have problems loading our car outside the house, as he could check our mate Fran Valley testing the Audi A3 e-tron

The costs of the contract and the electricity

Little people have read in depth the invoice of electricity supply, and interest to do so. In my case I have hired 3,45 kW with time discrimination, in the rate most advantageous payment each kW of consumption to 0,067189 euros. Each kilowatt of power is available it costs me 3,503605 euros. For 3,45 kW of power payment 12,09 € per month, consumption tax and electric. That is the fixed term.

With this power I can not recharge to 16 amps, would leap the differential circuit breaker (or “leads”). At 10 amps it could recharge, 2,3 kW, if not simultaneous with another kilowatt of consumption in appliances, or whatever. Therefore, load to 16 amps need more power contracted.

An electric car consumes about 12-14 kWh per 100 km

Without the discrimination time, the 30 kWh in a Nissan Leaf could recharge with 3,82 euros, without considering losses. With night rate would be lowered to 2 euros. There is an even lower rate, the supervalle, to which I’ve embraced. That is the term variable, which we pay for the consumption.

Returning to the example of 10 amps, to get the energy to do 100 miles, as the average (13 kW), would take about six hours and it would cost me 0.87 euros. Without time discrimination, would not make it to the 2 euros. That cost is unreachable for any car with engine heat, even if you use gas.

hence the importance of seeing the bill, to have an estimate of how much it would cost to recharge. If you need a second contract, the fixed term or the contracted power would have to pay it apart.