V1G is the industry term for managed one-way charging. A utility, an energy program or a site controller can schedule and adjust how your car charges — when it starts, how fast it runs, and whether it pauses — but the power only ever flows into the car. If V2G is a two-way street, V1G is a one-way street with a traffic light.
Key Takeaways
- V1G means managed one-way charging: the session can be scheduled, slowed or paused, but power never flows back.
- Drivers meet it in utility managed-charging programs and in fleet and workplace load plans.
- It needs no bidirectional hardware, but the charger or car must be controllable, for example through OCPP or an app.
- V2G is the two-way version; the terms are kept separate because the hardware and uses differ.
Where You Will Meet the Term
Most drivers meet the behaviour before the label. Utility managed-charging programs use it when they ask home chargers to wait for off-peak hours or ease off during a grid peak. Fleet and workplace plans use it to keep many cars within one site’s power limit. The term itself turns up in utility program rules, charger datasheets and standards documents, usually without an explanation, which is why it sends people to search engines.
What V1G Can Do
- Shift the session. Delay the start until cheaper or cleaner hours, which is the managed version of the scheduling in our guide to smart charging and time-of-use tariffs.
- Turn the power up or down. Slow a session while the grid or the building is busy, then speed it up again later.
- Pause and resume. Stop charging during a short peak and restart automatically afterwards.
- Share a site’s capacity. Spread one connection across many parked cars so each gets a fair share, the job described in our article on dynamic load balancing.
What V1G Cannot Do
V1G never sends power back. The car is a load, nothing more: it cannot support your home in an outage or sell energy to the grid. Sending power out of the battery needs bidirectional hardware and a car that supports it, the V2L, V2H and V2G family explained in Bidirectional Charging Explained. That distinction is the whole point of the separate terms: G in both names stands for the grid, and the number and letter describe which way energy may flow and who is in control.
| V1G | V2G | |
|---|---|---|
| Power flow | Into the car only | Into and out of the car |
| Who controls it | Utility, program or site controller adjusts the session | Grid or home system, within the owner’s settings |
| Hardware needed | A controllable charger or car; no bidirectional equipment | Bidirectional car and charger |
| Typical use | Off-peak shifting, peak pauses, site load limits | Grid services, home backup within a V2H setup |
Why It Matters When You Choose a Charger
Managed programs can only steer equipment that listens. A charger that speaks a standard protocol such as OCPP, or that the utility can reach through the car maker’s systems, can join a program; a basic unit that only starts when plugged in cannot. ENERGY STAR recognises this ability in its connected criteria for chargers, where responding to utility signals is an optional feature, as our article on ENERGY STAR for EV chargers explains. In the EVDANCE range, the EV-ACT3204PE 22 kW wallbox offers RFID and app control, and the dual-connector EV-AC03201T station speaks OCPP 1.6J, the kind of connection managed site programs are built on.
Frequently Asked Questions
Is V1G the same as smart charging?
It is the grid-facing part of it. Smart charging is the broad idea of controlling when and how fast a car charges. V1G is the specific case where an outside party, such as a utility or site system, does the controlling, with power flowing one way.
Does V1G mean my car charges more slowly?
It can pause or reduce power at busy times, then catch up later. Programs are built around the time you say you need the car, so the aim is a full battery by departure, reached by a cheaper route for the grid.
Do I need a special car for V1G?
No bidirectional car or charger is needed. The control lives in a connected charger, or in the car’s own telematics on some programs. Check the program’s rules for which equipment it supports before you buy.
Related Reading
- Smart Charging and Time-of-Use Tariffs: How Scheduling Cuts EV Charging Costs
- Bidirectional Charging Explained: V2L, V2H and V2G
- What Is Dynamic Load Balancing, and Why Does Your Wallbox Home Charger Need It?
