V2G vs a stationary battery: which makes sense when?
Both use stored energy to cut peaks and store cheap power. A stationary battery is the reliable choice today; V2G is the future option.
Last updated 15 August 2026
Vehicle-to-grid and a stationary battery aim at the same goals — shaving peaks, storing cheap energy, earning flexibility. Choosing between them today is mostly about reliability versus potential.
The stationary battery: proven and available
A dedicated battery is the dependable choice now. It’s always available, sized precisely for the job, and independent of whether any vehicle is plugged in. It shaves peaks to avoid a grid upgrade, stores cheap overnight energy, and adds resilience — all with mature, off-the-shelf technology.
V2G: using capacity you already own
V2G’s appeal is elegant: rather than buying a separate battery, it taps the large capacity already sitting in your parked vehicles. But that capacity comes and goes as vehicles leave, so it’s not always there when you need it. And every export cycle is wear on a battery you rely on for driving — a real cost that has to be weighed.
How to choose today
For most depots now, if you need the function, a stationary battery delivers it reliably, while V2G remains the interesting future option. The two aren’t mutually exclusive: some sites will run a stationary battery for guaranteed capability and add V2G later as vehicles and chargers support it, for extra value.
The direction of travel
As bidirectional vehicles and chargers become standard, the balance will shift and using the fleet’s own batteries will make more sense. Until then, judge each on today’s terms: is V2G worth planning for yet as a hedge, and a stationary battery for anything you need working now.