A parked EV is a battery doing nothing. Smart charging decides when it fills; V2G lets it give back. Together they turn a fleet of cars into one of the largest distributed storage resources on the grid.
Smart charging controls when and how fast an EV charges — shifting it to the cheapest, cleanest, least-congested hours. Vehicle-to-grid (V2G) makes that flow bidirectional: car batteries can be charged through signals from the charge management system and can also feed energy back to the grid when it's needed most, lowering peak costs and supporting reliability. ISO 15118 is the open standard that unlocks this two-way capability.
Most EVs spend the vast majority of their lives plugged in but idle. Smart charging and vehicle-to-grid are two steps along the same idea: that idle time is an opportunity, not just a wait.
Smart charging means the charging session is managed rather than dumb. Instead of drawing full power the instant a car is plugged in, the system schedules charging around what matters — time-of-use tariffs, grid congestion, on-site renewable generation, and the simple fact that a car parked for ten hours doesn’t need to finish in one. Done across many vehicles, this avoids expensive demand peaks and can charge a whole site within an existing grid connection that “dumb” charging would overwhelm.
V2G technology has the potential to revolutionise how car batteries are used and managed. It enables car batteries to be charged through signals sent by the charge management system (CPMS) — and, crucially, to discharge energy back to the grid. That makes the flow bidirectional: an EV owner can balance the grid and even sell excess energy back to it. Managed this way, EV batteries become distributed storage that lowers electricity costs and relieves pressure on the grid during peak hours.
Through V2G, electric vehicles can feed energy back into the grid when it’s needed most — reducing system peak costs and guaranteeing a more intelligent, dependable electricity supply.
ISO 15118 — an open standard for communication between electric vehicles and charging stations — is what unlocks bi-directional charging. It lets the vehicle and charger securely share data and negotiate energy flow in both directions. Alongside it, OCPP governs the link between the charger and the backend, and OSCP exposes available grid capacity — so the whole chain, from car to grid operator, can coordinate.
At fleet scale, smart charging is often the difference between needing a costly grid upgrade and not. And as more storage is needed to firm up renewables, a coordinated population of EVs starts to look like a virtual power plant on wheels — exactly the kind of distributed flexibility the grid increasingly depends on.
We build the management layer that makes smart charging and V2G real — hardware-neutral, standards-based, and grid-aware. See it in EV fleet load management, and the bigger picture in reframing EV charging.
Smart charging and V2G only pay off with the right management layer. We build it. Let's talk.