Using Vehicle-to-Grid (V2G) technology, commercial EV fleet operators can support grid resiliency and maximize renewable energy sources while adding monetization opportunities by selling power back to utilities. V2G essentially allows fleets to store power in EV batteries and discharge it back into the grid. Using the additional power source from fleet EVs can help stabilize energy conditions, provide power in emergencies, and alleviate the need to start up additional power sources.

The power fleet operators can provide to the grid, or buildings could offer revenue. Rhombus chargers are successfully supporting several V2G testing programs, and each commercial EV has the potential to make thousands of dollars per commercial EV. Through successful testing and V2G pilot programs, Rhombus uncovered three implementation considerations when creating a full-scale V2G fleet infrastructure.

Site Layout and Future Planning

Rhombus DC fast EV chargers are designed for fleets of all types and minimize additional installation costs for new dispensers. Fleet operators should consider site layout for future planning when developing a V2G charging depo. Taking steps during the initial layout phase to accommodate future fleet growth will substantially mitigate installation costs for the additional units. Rhombus EV chargers can be installed in a daisy-chain wiring architecture so that a single charger can accommodate up to five power dispensers. Even if you only need two charging spots now, you can plan and layout your depo floorplan to provide enough space to add three chargers when your fleet grows incrementally.


Commercial EV and EVSE

Equipment is the crucial consideration to make V2G work. Fleets must be equipped with Electric Vehicles (EVs) and Electric Vehicle Supply Equipment (EVSE) that support bidirectional charging. Operators will need UL 1741-SA certified Level 3 DC fast chargers (DCFC), such as Rhombus RES-DCVC125-480 chargers and RES-D3-CS20 dispensers, which run on 480 3-phase power.


Utility Relationship/Interconnect Agreement 

Like when a home with solar power sells excess power back to the grid, a utility interconnect agreement must be in place. Fleet operators should also reach out to a utility rep to establish an interconnect agreement that ensures they will buy power back. Utility reps will provide information about potential upgrades that may be required because of the new loads from EVSE, such as a new service line or an upgraded distribution transformer. Your local utility may also offer EVSE rebates to reduce the capital cost, so it’s recommended that you contact a rep early in the V2G infrastructure planning process. Other considerations include:

  • Selecting a utility aggregator
  • Determine utility incentives for EV infrastructure and discharge
  • Identifying V2G compliant vehicles
  • Determining site layout
  • Future planning
  • Steps to mitigate installation costs

Once the system is in place, both fleet operators and their local grid will reap the long-term benefits afforded by this novel technology.

Partner with the experts – let us help you take the next step toward setting up your EV charging infrastructure.