New · Available from January 2027

Prism V2G.
The wallbox that looks ahead.

Prism V2G is Silla’s V2G wallbox: it charges your car with solar energy, never trips your power supply and is ready, starting today, to send energy back to the grid. And it already meets the new rules for home charging.

Versions and prices Datasheet
Prism V2G, the bidirectional wallbox by Silla Industries, front view with the green charging light on
  • Ready for
    the 2027 rules
  • Bidirectional
    V2G Ready
  • Built-in
    CIR
  • Talks to
    your meter
  • Charges
    with the sun
  • Everything
    in the app
Home garage at sunset with an electric car charging from a wall-mounted Prism V2G
1 January 2027

New rules for charging at home.

Across Europe, new home charge points must be smart: they have to manage charging intelligently and talk to the smart meter, as required by the Renewable Energy Directive (RED III). ISO 15118-20 is becoming the common European language between car and charger. And in Italy, from 1 January 2027, every new private charge point up to 22 kW must comply with Annex X of the CEI 0-21 standard. Prism V2G already meets all of them: install it and you’re compliant from day one, with no add-ons and no worries.

V2G, made simple

Your car battery becomes an energy piggy bank.

V2G stands for Vehicle to Grid. An ordinary wallbox lets energy flow one way only: from the grid to the car. Prism V2G is bidirectional: energy can also flow back, from the car to the grid.

Why does it matter? Think of your car battery as a piggy bank:

  1. Save when it pays. You charge the car with sunshine from your solar panels, or at the times of day when energy is cheapest.
  2. The car stores the energy. Its battery holds far more than you need for everyday driving.
  3. Give it back when it’s needed. At peak times, when everyone switches everything on and the grid needs energy, you can supply some of it and get paid for the service.
Good to know. To use V2G you also need a bidirectional car and the service to be offered by your grid operator. That’s where carmakers are heading. Prism V2G is ready today: when they are too, you won’t need to change anything, just check that your electrical system complies with local rules.

Further reading: two-way charging, V2G and V2H: how the car becomes a battery for your home and the grid.

How V2G works Animation. First, energy from the grid and the sun goes to the car (green arrows); then, at peak times, the car sends energy back to the grid (blue arrows), always through Prism V2G. Sun GridPrism V2GCar
  • Charge with the sun or when it costs less
  • Give energy back at peak times
Energy flows both ways, always through Prism V2G.
Built-in CIR

The “traffic warden” the rules require is already inside.

Smart charging needs a controller, which the Italian CEI 0-21 standard calls the CIR, the Charging Infrastructure Controller. Think of it as a traffic warden: it keeps an eye on the power the wallbox draws from the grid, regulates it safely, responds to signals from the grid and keeps a log of what happens.

The CIR can also be a separate device, bought and installed on its own. But every extra component means more cost, more cables and more work for the installer.

Prism V2G has the CIR built in. No extra components: you install the wallbox and that’s it.

External CIR versus built-in CIR A traditional wallbox needs an external CIR with extra cables; Prism V2G has the CIR built in. Traditional wallboxPrism V2G CIR + one more part+ cables and labour+ costs Built-in CIR Nothing to add
Dynamic load management

Prism V2G talks to your meter. And your power never trips again.

You’re charging the car and suddenly someone turns on the oven, or the hairdryer: that’s usually when the power trips. With Prism V2G it doesn’t happen.

Italian second-generation Open Meter smart meter, which Prism V2G talks to via Chain2

Prism V2G always knows how much power you have left and adjusts charging to match. It measures it with the sensors supplied in the box, installed next to the meter: 1 for the single-phase version, 3 for the three-phase.

Turn on the oven? Prism V2G slows charging down, pausing it completely if needed. Turn it off? Charging speeds up again. All on its own, all the time.

In Italy it goes one step further. Most homes there now have a second-generation smart meter, and Prism V2G talks to it directly in a language called Chain2, receiving the data over the electrical wiring you already have: no sensor and no new cable to the wallbox.***

Wherever you live, it works: the sensors are always in the box, 1 for the single-phase version and 3 for the three-phase.
How Prism V2G shares the power available at the meter 3 kW supply. With the hairdryer and oven off, the home uses 0.5 kW and the car charges at 2.5 kW. With the 0.8 kW hairdryer on, the home rises to 1.3 kW and charging drops to 1.7 kW. With the 1.5 kW oven on, the power left for the car falls below the 1.4 kW minimum and Prism V2G pauses charging so the power doesn’t trip. 3 kW meter Chain2 or sensors minimum 1.4 kW chargingchargingpausedpaused + 0.5 kW1.3 kW2 kW2.8 kW 2.5 kW1.7 kW0 kW0 kW HomeCar

(() => { const fig = document.currentScript.closest(“figure”); if (!fig) return; const phon = fig.querySelector(“#sp-phon”), forno = fig.querySelector(“#sp-forno”), live = fig.querySelector(“#sp-c2-live”); const msg = { “00”: “Hairdryer and oven off. Home 0.5 kW, car 2.5 kW: the car gets all the energy available.”, “10”: “Hairdryer on. Home 1.3 kW, car 1.7 kW: charging slows down, but doesn’t stop.”, “01”: “Oven on. Home 2 kW, car 0 kW: charging stops because the 1.4 kW minimum isn’t available.”, “11”: “Hairdryer and oven on. Home 2.8 kW, car 0 kW: charging stops because the power would trip.” }; const update = () => { live.textContent = msg[(phon.checked ? “1” : “0”) + (forno.checked ? “1” : “0”)]; }; phon.addEventListener(“change”, update); forno.addEventListener(“change”, update); })();
The car and the wallbox talk to each other With the ISO 15118-20 protocol the car introduces itself and reports its battery level; Prism V2G starts charging up to the level chosen in the app. Hi, I’m your car. Battery at 45%. I know you! Charging to 80%.
ISO 15118-20

The car and the wallbox talk to each other.

ISO 15118-20 is a technical name you’ll soon get to know. It’s the European standard language Prism V2G uses to talk to cars that support it.** In practice:

  • you see your car’s battery level in the Silla app;
  • you choose how far to charge it, right from the app;
  • Prism V2G recognises the car plugged in and starts on its own, with no app and no card. Handy, for example, in shared garages.
Don’t mix them up. A wallbox that supports ISO 15118-20 isn’t automatically V2G as well: they’re two different features. To be truly future-proof you need both. Prism V2G has both.
Electric car charging in front of a house with solar panels on the roof
Solar mode

Driving on sunshine? You can.

If you have solar panels, Prism V2G uses the extra energy they produce to charge your car, instead of selling it to the grid at a low price.

How Solar mode works.

During the day your panels produce energy. Part of it is used by the home: fridge, lights, washing machine. What’s left over usually goes to the grid, and you’re paid little for it.

Prism V2G watches how much energy is left over in real time and sends it to the car. If a cloud passes, it slows down. When the sun comes back, it speeds up. You don’t have to do a thing: your car charges with energy you would otherwise have almost given away.

Prism V2G keeps everything that made Prism Solar the benchmark charger, and adds the future.

A sunny day Illustrative chart: solar production exceeds the home’s consumption in the middle of the day; the extra energy goes to the car. 610131620 time of day to the car panels home to the car
Indicative chart of a sunny day.
And more

Everything you expect from a Prism.

Scheduled charging

In the app you choose how to charge at every hour of the day, for example only when energy is cheapest.

Remote control

With the free Silla app for iOS and Android you start and stop charging, check consumption, set a monthly budget and get notifications, even when you’re away.

RFID card access

Only people with a card can charge: useful in shared buildings, in homes with other people, in B&Bs or for guests. One card is included.

Always connected

WiFi and Ethernet as standard. And if WiFi doesn’t reach your garage and there’s no cable, there’s a GSM module too.*

7-metre cable

A long cable that easily reaches your car’s socket, with a Type 2 connector, the European standard.

Updates itself

Updates arrive over the internet or through the app (OTA). More security, and new features as soon as they’re ready.

IP65, outdoors too

It withstands rain and water jets. You can install it outside, even without a canopy.

For every electric car

It charges every car with a Type 2 socket: fully electric and plug-in hybrid.

For installers

RS485 port and MQTT, OCPP 1.6J, OCPP 2.0.1 and 2.1 protocols to integrate it with other systems.

Two versions

V2G wallbox: single-phase or three-phase?

It depends on your home’s electricity supply. Most homes have a single-phase supply. If you’re not sure, check your bill or ask your installer.

Prism V2G single-phase, bidirectional wallbox up to 7.4 kW with Type 2 cable

up to 7.4 kW

Prism V2G single-phase

For 230 V single-phase supplies.
1 sensor included.

Prism V2G three-phase, bidirectional wallbox up to 22 kW with Type 2 cable

up to 22 kW

Prism V2G three-phase

For 230/400 V three-phase supplies.
3 sensors included.

Choose your version
Prism V2G Twin: two Prism V2G units on the same post
Prism V2G Twin

Two cars to charge? There’s a double one.

Prism V2G also comes in a Twin version: two Prism V2G units mounted on the same post, each with its own cable, to charge two cars at once. Everything you’ve read so far, times two. It’s available single-phase, up to 2 × 7.4 kW, or three-phase, up to 2 × 22 kW, with two RFID cards included.

With the post, you don’t need a wall to mount it on. A few ideas:

  • for families, when there are two electric cars in the garage or driveway;
  • in a shared car park, between two neighbouring spaces;
  • in B&Bs, farm stays and hotels, to offer charging to guests;
  • at work, for company cars or for customers and visitors;
  • outside shops, offices and restaurants.
Discover Prism V2G Twin
Made in Italy · since 2017

Designed and made in Padua.

Since 2017 Silla Industries has designed and built its EV chargers in Padua. Prism V2G was born here too: conceived, designed, developed and made in Italy.

Versions and prices
The two founders of Silla Industries working on chargers in the Padua workshop

* Data plan sold separately.

** Features available only with compatible vehicles.

*** Chain2 is available in Italy with second-generation (2G) smart meters. Elsewhere, and with older meters, Prism V2G uses the sensors supplied: 1 for the single-phase version, 3 for the three-phase.