Three characters, .org, in the X-to-Y shape. V2M sits next to a family of terms the automotive and energy industries already use constantly: V2G, V2X, V2V, V2L. Vehicle-to-something is standard vocabulary in electrification.
Vehicle to microgrid is the most natural reading, and it describes a live engineering and policy problem. Fleets of electric vehicles are enormous distributed batteries, and the question of how they feed back into local grids is being worked on right now by consortia, standards bodies, and research groups. The .org is what those organisations use.
Other readings hold: value to market, voice to machine, volunteer to mission. The last one suits nonprofits directly.
The strength is that the name sits inside an existing naming convention, so the audience reads it correctly with no prompting. That’s the shortest path from domain to understood brand.
Three characters, listed for sale. Offers welcome.