Choosing a wallbox for home or business charging is not simply a matter of power: the correct choice requires careful evaluation of electrical system characteristics, vehicle compatibility, built-in features and regulatory requirements, as well as the environmental conditions of installation.
In this wallbox selection guide we take a detailed look at the main factors to consider when selecting the most suitable wallbox, with a focus on the technological standards of 2025.
Types of wallboxes: single-phase and three-phase
In the context of alternating current (AC) charging, wallboxes fall mainly into two categories
- single-phase wallboxes: designed for standard household electrical systems, they allow recharging up to 7.4 kW(32 A, 230 V). They are an ideal choice for most residential users, offering a good compromise between charging speed and system compatibility.
- Three-phase wallboxes: capable of delivering higher powers(up to 11 or 22 kW), they require a properly sized three-phase system. They are suitable for homes with advanced systems, apartment buildings, businesses or corporate settings where fast charging is an operational requirement.
How to choose the right wallbox: the basic technical criteria
Compatibility with electrical infrastructure
The first check to be made when choosing the wallbox for home and business electric car charging concerns the configuration of the electrical system: available power, presence or absence of three-phase, and ability to carry the additional load of the wallbox. In addition to the committed power (e.g., 3, 6, 10 kW), it is necessary to assess whether the system already has adequate protection systems.
Vehicle compatibility
It is essential to know the specifications of your car’s on-board charger. Not all cars are capable of accepting three-phase charging: many plug-in hybrids and some full-electric models have only single-phase chargers. In these cases, a three-phase wallbox brings no tangible benefit, except in anticipation of a vehicle change.
Smart functionality and dynamic management
The latest generation of home and business wallboxes integrate a range of intelligent functions that are increasingly in demand:
- Remote control via app
- Programming charging time slots
- Energy consumption monitoring
- Integration with photovoltaic systems (wallbox with photovoltaics)
- User authentication via RFID
- Dynamic Load Management
The latter function, which is particularly relevant for avoiding overloads, allocates available energy between the car and household consumers in real time.
Place of installation and degree of protection of wallboxes
The installation environment directly conditions the technical choice. For outdoor installations, it is essential that the wallbox has an adequate IP rating (minimum IP55), ensuring resistance to rain, dust, moisture and temperature changes. Outdoor versions should also have cables and components that are resistant to UV light and accidental mechanical impacts.
Wallbox installation and service: aspects too often overlooked
Professional wallbox installation: why it is crucial
The wallbox is a device that requires specific skills for a compliant installation. Turning to unqualified installers exposes you to risks of malfunction, warranty voiding and electrical accidents. The best manufacturers offer turnkey packages including:
- Technical inspection
- Verification of the system and loads
- Installation by licensed technicians
- Certified testing and commissioning
After-sales support and extended warranty
A good wallbox must be supported by responsive, in-language, and knowledgeable customer service. The reliability of the wallbox over time depends not only on the hardware, but on the availability of service, firmware updates, spare parts, and technical support.
Italian manufacturer Silla Industries offers extended warranty packages of up to 5 years, including quick wallbox replacement in case of failure. A must-have protection in continuous-use or business environments.
Prism from Silla Industries: the wallbox designed for the future
Among the solutions currently available, Silla Industries’ Prism represents a benchmark in terms of innovation, safety and compatibility. Designed to fit every need, the Prism PV-compatible wallbox is available in single-phase and three-phase versions up to 22 kW and is entirely Made in Italy.
Main features:
- Intelligent load management and Solar mode for photovoltaics
- Hourly scheduling and detailed session reports
- Multi-user RFID authentication
- Mobile app with remote control and real-time monitoring
- Compact design and high quality materials
- Italian technical support and certified installation throughout Italy
The mistakes to avoid when choosing a wallbox
Evaluate the wallbox on the basis of maximum power only
One of the most common mistakes is to choose a wallbox simply on the basis of the maximum rated power output (e.g., 22 kW), without considering the actual compatibility with the home system and vehicle. A 22 kW wallbox requires a suitable three-phase supply (typically from at least 11 kW and up) and a consistent energy supply contract.
Ignoring the specifications of the car’s on-board charger
Every electric vehicle is equipped with anOn Board Charger (OBC), which determines the maximum power at which alternating current (AC) charging can take place. If the car’s charger is limited to 7.4 kW single phase, it will not benefit from the higher powers offered by an 11 or 22 kW wallbox.
Relying on unqualified installers
The installation of a wallbox is not a trivial task and requires the intervention of licensed professionals with specific skills in the electrical field and particularly in the design of charging systems. Improvised or uncertified installers can make mistakes in installation, differential protection or configuration of dedicated lines, with consequences both in terms of safety and performance. Moreover, only a certified installer can issue a Declaration of Conformity, an essential document in case of inspections, insurance or tax deductions.
Underestimating the importance of certifications, protections and technical assistance
A wallbox is a power device that operates continuously in direct contact with the electrical system. For this reason it must comply with European and international standards (such as CE, IEC 61851, EN 62196) and integrate appropriate protections (type A differential with DC detection, overvoltage, short circuit), and offer reliable after-sales service. Choosing devices without official certifications or of uncertain provenance exposes you to risks of malfunction, system damage, and civil liability in case of accidents.
One wallbox is not worth the other: here’s why to choose wisely
The wallbox is a long-term investment, affecting the safety, efficiency, and quality of the charging experience. Choosing an advanced solution, installed by professionals and supported by solid after-sales service, means building a home or business infrastructure ready for the e-mobility of the future.
Prism by Silla Industries is the result of careful design, oriented to durability, smart integration and maximum compatibility. A wallbox designed to accompany every user in the energy transition, with the security of a reliable, certified and Italian product.
Discover Prism from Silla Industries and request a no-obligation consultation to discover the perfect configuration for you.
