Charging your electric car at home: a complete wallbox guide
Power, times, costs and rules in simple language, from houses to condominium and underground garages.
Guide updated September 2026. Every installation needs an on-site assessment.
Can I charge from a household socket?
Sometimes technically possible, but ordinary sockets are not designed to supply an electric car continuously for hours. A professional must assess the installation, socket, cables and protection.
A wallbox is designed for charging: it communicates with the car, limits available current and can schedule charging or adjust power to prevent the main supply from tripping.
Ordinary socket
- Slow charging
- No smart management
- Needs checking for prolonged use
Wallbox
- Designed for car charging
- Adjustable power
- Scheduling and load control
kW indicates power, kWh indicates energy
The kW unit measures instantaneous charging power. The kWh unit measures how much energy enters the battery. Time also depends on the car's onboard charger: a car accepting at most 7.4 kW AC will not charge at 11 kW even on a more powerful wallbox.
| Power | Theoretical energy in 8 hours | Indicative use |
|---|---|---|
| 2.3 kW | 18.4 kWh | Limited daily mileage |
| 3.7 kW | 29.6 kWh | Steady home charging |
| 7.4 kW | 59.2 kWh | Faster single-phase charging |
| 11 kW | 88 kWh | Three-phase installation and compatible car |
| 22 kW | 176 kWh | Special home situations |
Theoretical values: conversion losses, temperature, battery level and car and wallbox limits affect actual results.
Estimate charging time
Enter the energy to add and the actual power available.
From the distribution board to conformity certification
The wallbox needs a circuit and protection specified for the installation, selected device and manufacturer's instructions.
- 1
Site survey
Check the board, meter, earthing, cable route and parking location.
- 2
Power selection
Consider mileage, parking hours, household loads and the car's onboard charger limit.
- 3
Circuit and protection
The installer sizes cables and protective devices for the actual situation.
- 4
Installation and testing
The wallbox is configured, tested and handed over with required documentation.
After work, the qualified contractor issues the declaration of conformity required by Italian Ministerial Decree 37/2008, with applicable attachments.
Source: Italian Ministerial Decree No. 37 of 22 January 2008.A 7.4 kW wallbox does not always need to draw 7.4 kW
With dynamic management the wallbox measures household consumption and automatically reduces charging when you switch on the oven, air conditioning or heat pump. Often you can start with available capacity and consider an upgrade only if really needed.
11 or 22 kW normally requires a three-phase supply, sufficient contracted capacity and a compatible car.
Private garage, shared areas and separate consumption
Before starting, establish where electricity will come from and which spaces the circuit will cross.
Garage connected to your own meter
Check the route to the garage, especially through shared areas.
Condominium supply
A shared solution and reliable consumption allocation system are needed.
Several existing or future wallboxes
Plan power distribution and load management to avoid repeated work.
Charging infrastructure works may require an owners' meeting resolution. If the condominium refuses or does not decide within three months of a written request, Italian law allows the resident to proceed at their own expense, subject to applicable conditions. Review the case with the administrator and technician.
Source: Italian Legislative Decree No. 257 of 16 December 2016.Charging is possible, but fire safety must be checked
An underground garage does not automatically prevent installation. Check its characteristics, any fire prevention requirements, wallbox position, electrical isolation, signage and documentation.
Where the garage is subject to fire prevention controls, work may require a fire safety professional and updated documentation.
Preliminary checks
- Garage classification and documentation
- Wallbox position and accessibility
- Emergency isolation and protection
- Cable routing and protection
- Required signage and measures
How much does installing a home wallbox cost?
There is no single correct price for every home. Distance from the distribution board and electrical works may cost more than the wallbox.
Indicative range for a home wallbox, varying with power and features.
Indicative estimate for a short cable route and suitable existing installation.
Long distances, excavation, upgrades, condominium or fire safety procedures need an assessment.
Indicative amounts; VAT and conditions must be checked in the quote. Supply upgrades, building works and exceptional adaptations are not automatically included.
Using solar energy to charge
A compatible wallbox can modulate charging according to solar generation and household consumption. Benefits depend on parking hours, system size, season and battery storage.
If the car is away during peak generation, solar panels alone do not automatically guarantee free charging.
- Charging while parked
- Schedule preferred hours
- Potential use of solar energy
- Power and consumption control
- Initial cost
- Power and installation condition
- Car's onboard charger limits
- Condominium and fire safety rules
Which wallbox suits your home?
The answer combines six factors, not just the power rating on the box.
Home wallboxes in simple terms
Can I install a wallbox with a 3 kW electricity supply?
It may be possible at reduced charging power while managing other consumption. A dynamic system can automatically reduce wallbox demand when the house needs more energy. Feasibility must be checked on the installation.
Do I need to increase my supply capacity?
Not always. It depends on range needed, available time and other household loads. Often it is worth trying dynamic management before choosing a supply upgrade.
How long does home charging take?
Adding 40 kWh takes roughly 19 hours at 2.3 kW, 12 at 3.7 kW, 6 at 7.4 kW or 4 at 11 kW, including indicative losses. The car may still limit power.
Do I need permission from the condominium?
It depends on cable routes, use of shared areas and the power supply. Submit a documented request to the administrator and review the design with a technician.
Can a wallbox be installed in an underground garage?
Yes, in many cases, but garage conditions and any fire prevention obligations must be checked before work begins.
Can I charge directly from solar panels?
Yes, with a compatible system and wallbox. Usable solar energy depends on generation while the car is connected and other household consumption.
Who can install the wallbox?
A qualified contractor must install and test the system and issue the declaration of conformity with required attachments.
Main regulatory sources
Italian Ministerial Decree 37/2008 on building installations; Legislative Decree 257/2016 for condominium charging infrastructure; Fire Brigade guidelines of 5 November 2018, consolidated text 2022. Rules, incentives and procedures can change: check current law and property conditions before work.