Tesla Guide - How do I charge my Tesla properly?

You are the proud owner of a Tesla, are you considering ordering a Model 3 or have you already ordered it? Here you can find out how a Tesla can be charged and what tips there are to conserve the battery or to charge it as effectively as possible.

  1. Basic rules that I should follow when charging an electric car.
  2. How do I charge my Tesla at home?
  3. How good is the Tesla Wall Connector?
  4. How do I charge my Tesla on the go?
1. Basic rules that I should follow when charging an electric car.

The most critical issue with the electric car is the range. In order to get a long range out of an electric car for as long as possible, it is advisable to consider basic charging patterns. This conserves the battery and your electric car drives as far as it did on the first day.

  • Only charge over 90% immediately before the trip and only if it is not otherwise sufficient for the planned trip.
  • Under 20% (yellow area) you should not park the car without a charging facility. Below 7% (red area) you should never turn off the Tesla overnight as it could discharge.
  • The Tesla battery feels most comfortable in the range of 20-80%
  • The slower you charge, the better it is for the battery

If you follow all of these rules, your battery will keep the range as it did at the beginning. Gradually, however, every battery loses its capacity due to material wear and the discharging and charging of the electrodes.

2. How do I charge my Tesla at home?

At home, you can charge your Tesla like any other electric car with a standard household socket or wallbox.

The Schuko (Germany / Austria) or the T13 (Switzerland) charge single-phase with a maximum of 10A. An industrial socket (blue, CEE16, single-phase, 16A) is also available in some households. These “household methods” protect the car's battery, as the cells are gradually charged due to the low charging power of a maximum of 3kW and the battery is not overheated. The following disadvantages result:

  • high charging losses due to the heating of charging components and the electrical resistance in cables and plugs. The charging losses are between 15-20% here. In the worst case, the socket will burn out because it is not sufficiently protected for the long charging cycles.
  • the computer in the Tesla is permanently active and this additional energy consumption adds up over the many hours of very slow charging.
  • Depending on the ambient temperature, the battery does not get really warm and is not charged in its optimal temperature range. This increases the damaging effects.
  • For older Model S and Model X models: High load on the memory module (eMMC). Since the computer is permanently active, the memory chip is also permanently written to.

With this charging variant, your Tesla feels much more comfortable. The gentlest charging speed is in the range between 11 and 16.5 kW. At 12-14 amps the charging efficiency is higher compared to 16 amps. At 14 amps it should be between 92-94%, at 16 amps it is usually a little less than 90%. So if you have time and can charge three-phase, you should charge with 12 amps instead of 16 amps. The supplied UMC2 charger from Tesla, which has been issued since 2019, can only charge single-phase with a maximum of 3.7 kW.


3. How good is the Wall Connector?

In a nutshell: If you are looking for a simple, low-function wallbox to charge your Tesla, you will find it with the Tesla Wall Connector. But if you are looking for the full benefits of a modern wallbox for your home, you should also look for better alternatives as a Tesla owner.

What can the connector do?

The Wall Connector from Tesla can do what it should be able to do. With dWith the permanently integrated charging cable (2.6m or 7.4m) and the LED, every Tesla model can be conveniently charged. The wallbox is equipped with a type 2 plug and is therefore also suitable for other manufacturers.

What is missing from the connector?

We'll start with the most important drawback from our point of view. The Wall Connector has no access restriction. In terms of security, it is therefore possible for any stranger to charge their electric car at your place if the connector is not safe in a garage. So if you have a freely accessible carport or want to use several connectors for a fleet (e.g. company parking lot), you have to take the risk of unwanted charging by strangers. On the subject of safety, it must also be mentioned that no DC overvoltage protection is integrated. In addition, the connector cannot keep any statistics and saves loading logs. In retrospect, for example, you cannot distinguish between different charging processes, electric cars and times. In this context, it should also be mentioned that anyone who wants to integrate a billing system in order to document the electricity costs of the company car is not served here. The connector is comparatively cheap (from approx. 550 €), but does not come with sufficient features. Everyone has to decide for themselves whether this minimalist charging option is sufficient for their home. We offer alternatives to the connector in our shop.

4. How do I charge my Tesla on the go?

Now we come to a charging option that is a key argument for Tesla drivers. The Supercharger network is only compatible with Tesla models and is constantly being expanded, so you don't have to worry about getting stuck on road trips or longer journeys. Charging capacities of up to 250kW are no problem for the Model 3, for example. The charging process is significantly simplified thanks to the plug and charge process, in which the SuperCharger communicates directly with the car and bills it via the stored credit card. The costs for SuperCharging are relatively cheap (currently € 0.35 / kWh). There are currently two variants of SuperChargers. They are referred to as V2 and V3. The only difference is that the V2 SuperChargers only have a type 2 charging cable and with the V3 you have the choice between CCS and type 2. Both plugs can be charged quickly. All SuperCharger locations are stored in the Tesla's navigation system. The Tesla navigates straight there on long journeys. At most SuperCharger locations there are also other fast chargers from other providers, e.g. from ENBW, Fastnet, Allego or IONITY. With these fast chargers, a charging card or app is required to activate the charging station. So plug and charge is largely eliminated. Only with Fastnet is it now possible to register the vehicle and then enjoy Plug and Charge. The costs are usually significantly higher compared to Tesla. Basically nothing speaks against fast charging. But don't overdo it. With fast charging, the battery is heated up very quickly. However, batteries do not particularly like it when they are exposed to high currents during charging or discharging and at the same time very cold or high temperatures prevail. The battery management system ensures that the temperature is kept within a certain range during charging and that the battery is charged as gently as possible, but that is always only a compromise between charging speed and damage. In addition, the battery capacity is reduced more quickly with frequent rapid charging.

On the go, however, you also want to charge outside of the Supercharger network. We offer the perfect everyday companion with the Juice Booster in a wide variety of set variants. You can charge with up to 22kW and there are all sorts of adapters with which you can charge electrically all over the world. In addition, the Juice Booster is waterproof and can be driven over with a wheel load of up to 3 tons, which makes it very practical in every situation.