An electric car in the driveway, but every evening the same question: where and at what price does it charge? For most households the answer is a wallbox on the house wall. Charging at home is more convenient and considerably cheaper than at a public charging point, where the charging-station check found an average of 54 cents per kilowatt-hour (ADAC). Since 2024, however, new rules apply: anyone installing a wallbox above 4.2 kilowatts must register it with the grid operator and make it controllable (Federal Network Agency). That sounds like bureaucracy, but it brings reduced grid fees and protects the power grid from overload. This guide explains in plain language which wallbox suits your household, how registration works, what grid throttling under Section 14a EnWG means in practice, and how you charge cleverly and safely with load management, PV surplus charging and an app on your home network. The electrical installation belongs in the hands of a certified electrician - the smart setup, app configuration and Wi-Fi integration we take care of at your home when you would like to have your wallbox set up and smartly configured.
Key takeaways
- Charging at home is much cheaper than at public stations, which average around 54 cents per kilowatt-hour (ADAC).
- Wallboxes up to 11 kW only need to be registered with the grid operator; above 11 kW an approval is required (ADAC).
- Since 2024 new wallboxes above 4.2 kW must be controllable - in return grid fees drop by around 110 to 190 euros per year (Federal Network Agency).
- During grid-oriented control the power may only be throttled to a minimum of 4.2 kW - enough to charge fully overnight (Federal Network Agency).
- With load management, PV surplus charging and app control on the home network you charge more cheaply, without overloading the house connection.
- The electrical installation is done by a certified electrician; app configuration, Wi-Fi integration and a patient explanation we handle on site in the Hildesheim and Leine valley region.
Why Your Own Wallbox Pays Off
Available around the clock, no detour to a charging station, no juggling of tariff apps: your own wallbox charges the car overnight while it is parked anyway. That is not only convenient but also cheap. At public charging points you pay an average of around 54 cents per kilowatt-hour (ADAC), while household electricity - depending on the tariff and especially with a dedicated EV electricity tariff - is usually well below that. A wallbox also causes only about half the charging losses (ADAC) of a normal household socket, which additionally carries the risk of overheating.
A standard household socket is not designed for hours of charging under high load - a permanently installed wallbox with its own circuit is. The devices themselves cost between around 300 and 2000 euros (ADAC) depending on features, plus installation by a certified electrician. This is exactly where careful planning pays off from the start: which charging power makes sense, where the box goes, how the cable reaches the meter cabinet and whether the house connection is strong enough. We clarify these questions together with the electrician before anything is drilled.
Most EVs charge at home
11 kW or 22 kW - Which Wallbox Makes Sense?
For home use the question is quickly answered: in the vast majority of cases an 11 kW wallbox is entirely sufficient. At 11 kilowatts an average battery charges comfortably full overnight, and many EVs cannot charge faster than 11 kW on alternating current anyway. A 22 kW wallbox charges twice as fast in theory, but that advantage fizzles out if the car does not accept the power - and at home, where the vehicle stands for hours, charging time rarely matters.
| 11 kW wallbox | 22 kW wallbox | |
|---|---|---|
| With the grid operator | registration only (ADAC) | approval required (ADAC) |
| Charging time (rough) | empty battery full overnight | about twice as fast |
| For everyday home use | sufficient in most cases | rarely truly necessary |
| Effort and cost | low | higher, often a stronger connection |
A practical middle ground is common: many 22 kW-capable wallboxes can be permanently throttled to 11 kW by the electrician. Then the simple registration applies again instead of the approval, and you keep the option to upgrade later if needed. Whether 11 or 22 kW - the power should match the vehicle, the house connection and the actual charging demand, not the biggest number in the brochure.
When in doubt, 11 kW is enough
Registering the Wallbox: Mandatory With the Grid Operator
Every permanently installed wallbox must be reported to the local grid operator - this has applied since the Low Voltage Connection Ordinance of 2019 (ADAC). How much effort this involves depends on the charging power. Charging devices up to 11 kW are merely subject to registration, and the grid operator may not object to the installation (ADAC). Boxes with more than 11 kW, by contrast, require approval; the grid operator has up to two months (ADAC) to check whether the grid can handle the additional load.
- Decide the charging power: register 11 kW or have 22 kW approved.
- Fill in the grid operator's registration form - usually online in a few minutes.
- For more than 11 kW, wait for the approval (up to two months).
- Installation by a certified electrician who also commissions the box.
- Set up controllability under Section 14a EnWG and choose the right grid-fee module.
Skipping registration is risky
Section 14a EnWG: Be Controllable, Save on Grid Fees
Since 1 January 2024, all new controllable devices with a power of more than 4.2 kW must comply with Section 14a EnWG (Federal Network Agency). Besides wallboxes, this also includes heat pumps, air conditioners and battery storage. The core of the rule: in rare bottleneck situations the grid operator may briefly throttle the wallbox in a grid-oriented manner to avoid overloading the local grid. In return you receive reduced grid fees.
Important in practice: the power may not fall below 4.2 kW (Federal Network Agency). So even in the rare throttling case the box keeps charging - 4.2 kW is enough to fully charge even larger batteries overnight, and a complete charging stop is ruled out. There is a financial reward for controllability: depending on the chosen module, grid fees fall by around 110 to 190 euros per year (Federal Network Agency), and with high charging consumption the percentage-based variant can bring even more. You can choose between a flat-rate reduction and a reduced working price.
Module 1: flat rate
A fixed annual reduction of the grid fee that is credited automatically - simple and hassle-free.
Module 2: working price
The working price per kilowatt-hour is reduced - especially worthwhile for those who charge a lot.
Module 3: time-variable
Time-variable grid fees reward charging in hours with low grid load - available to all EV owners.
No reduced grid fees without controllability
Load Management: Keeping Multiple Loads in Balance
A house connection can only deliver a certain amount of power. If the wallbox charges at full power while the stove, heat pump and tumble dryer run at the same time, the main fuse can reach its limit. This is exactly what load management prevents: it monitors the total consumption in the house and dynamically throttles the wallbox's charging power as soon as things get tight - and releases it again when capacity is available. This way you charge at the highest possible power without tripping the fuse.
This becomes especially useful when several large loads come together: two EVs in the family, a heat pump or a battery storage. Dynamic load management then distributes the available power intelligently - for instance, by having two wallboxes share the capacity or by letting the car back off when a lot is being used in the house. For this to work reliably, the wallbox, meter and home network have to talk to each other cleanly. We take on this integration during setup so that the interplay runs in the background and you do not have to worry about anything.
PV Surplus Charging: Driving on Your Own Solar Power
If you have a photovoltaic system on the roof, you can charge the EV with your own solar power instead of feeding it into the grid for little money. With PV surplus charging, the wallbox detects how much solar power is currently left over and charges at exactly that power - weaker or stronger depending on the sun. This considerably increases the system's self-consumption: according to Fraunhofer ISE, targeted surplus charging can raise the self-consumption rate from around 30 to 55-65 percent (Fraunhofer ISE). Every kilowatt-hour charged this way replaces expensive grid electricity and makes driving noticeably cheaper than the 54 cents at the public station.
Fill up on sunshine instead of feeding in
On low-sun days, surplus charging combines well with a dynamic electricity tariff, where the price fluctuates over the course of the day. Then the car charges with solar power when the sun shines, and during the cheap grid hours when it does not - how this works together with smart technology is shown in our article on cheap electricity with dynamic tariffs. This way the car runs on the cheapest available electricity as often as possible.
App, Wi-Fi and Home Network: Controlling the Wallbox Smartly
A smart wallbox can be controlled and monitored via an app: start and stop charging, schedule charging times, read the consumption per session or move charging to cheap hours. For this to work reliably, the box needs a stable connection to the home network. If the wallbox sits in the garage or at the carport, the Wi-Fi there is often weak - then a mesh system or a LAN cable helps. How to improve wireless coverage throughout the house is described in our article on stable Wi-Fi throughout the house; for stubborn dead spots our on-site Wi-Fi optimization helps.
- Schedule charging times and let the car charge automatically during cheap hours.
- Track charging sessions and consumption per session transparently in the app.
- Conveniently switch PV surplus and load-management rules on and off.
- Integrate the wallbox into the home network - via mesh Wi-Fi or a LAN cable.
- Protect access with strong passwords and keep the firmware up to date.
- Create several users or charging profiles in the family if needed.
Because the wallbox is reachable via app and cloud, it should be set up securely: a strong, dedicated password for the app account, up-to-date firmware and a well-secured home network. You will find the basics in our article on privacy and security in the smart home; how to manage strong credentials conveniently is explained in the article on securely setting up a password manager. Anyone who works a lot from home benefits from a cleanly set-up home network anyway - relevant tips are given in the article on the ergonomic home office.
Safety and Funding: RCD Type A, Dedicated Circuit, Subsidies
During charging, high currents flow for hours - safety is therefore not a detail but a duty. Under the DIN VDE 0100-722 standard, every wallbox needs its own circuit and its own residual current device of at least Type A and 30 milliamps (VDE). In addition, the protection must also detect DC fault currents - this is handled either by a Type B RCD or by a Type A EV specially developed for electromobility with DC fault current detection (VDE). This protection and the connection to the meter cabinet belong firmly in the hands of a certified electrician; only they may install the wallbox.
The good news: safe technology need not be expensive. Stiftung Warentest tested twelve wallboxes; ten performed well, two stood out for safety defects (Stiftung Warentest). The ADAC tested ten affordable models with over 900 charging sessions on five different EVs - without a single charging abort, and all built-in residual current devices worked to standard; the test winner was, of all things, the cheapest device (ADAC). So for a normal household there are solid, safe wallboxes at fair prices - what matters is proper installation and the right configuration.
Funding: keep subsidies in view
How We Set Up Your Wallbox - Without Tech Stress
A wallbox is more than a box on the wall: only with the right configuration does it charge cheaply, safely and to suit the household. The electrical installation - circuit, RCD protection and connection - is done by a certified electrician. Everything that comes after, we set up at your home: the app configuration, the integration into Wi-Fi or via LAN, the load management, the coupling with the photovoltaics and the controllability under Section 14a EnWG. This way the parts mesh together instead of standing side by side as isolated solutions.
In doing so, we patiently explain what really matters in everyday life: how to start a charge, how to tell that everything is running and what to do in case of doubt - beginner- and senior-friendly, without you having to become a tech expert. You can read more about the setup of your wallbox on the services page; if you want to network further technology anyway, our offer to set up the smart home at your place helps. You will find transparent terms and the home-visit flat rate on the page about our prices.
Plan on site
We look at the location, house connection and driving routine and advise, together with the electrician, on the right charging power.
Configure smartly
We integrate the wallbox into the home network, set up load management, PV surplus charging and the app - fully configured.
Register safely
We support the registration with the grid operator and the controllability under Section 14a EnWG including the right grid-fee module.
Patiently explained
We instruct you calmly, leave a simple guide on request and stay reachable as a fixed contact person.