My Employer says "Leave your ev at home or you go home!"

By any chance did they put this in writing? Or, do you have witnesses that they said it?

A third option (particularly if they put it in writing) would simply be to say very nicely that you don't have any other transportation and that while you can understand their legal concerns about recharging possibly being a hazard (and thus will not ask to recharge) you simply have no alternative but to disregard their illegal request to stop using your legally licensed vehicle.

This should be presented in writing on letterhead paper from a lawyer's office, and should be delivered by whatever postal method requires that they sign for the letter. Copies should be delivered both to your immediate supervisor and to the company's legal department. It should be followed up by an internal email CC'd to your home email address asking them to confirm they received your letter, and asking if they have any questions about either your or their rights regarding your transportation.

All of this should be said very nicely, and it should be started out with something to the effect of, "After due consideration of the reasonableness of your recent verbal request regarding my mode of transportation, and after consultation with legal counsel...." Avoid pontificating, simply state that you have adequate and legally licensed transportation, and that the use of your valid transportation is neither negotiable nor a matter which they can legally consider in contemplating termination of your employ.

Now, realize that this will not make them happy - but also understand that, provided you have a good work record otherwise, will be tantamount to putting them on notice that if they DO fire you in the future for any other reason they will need to find MORE justification for doing so than with any other employee with whom they have not had a similar documented instance of trampling your rights.

Blue -
Another vote for choosing your battles. Be healthy first.

I find that the nice approach generally works better and leaves more options. Personally, I'd work that angle until it's completely hopeless. You're collecting documentation - that's good. Give them a chance to respond to some calmer persuasion first. I can get just as mean and nasty as the next person, but I don't enjoy it at all. Fortunately I find that I seldom have to.

I had an employer tell me that, if I had and electric vehicle, I wouldn't be allowed to plug in. The reason was not really the cost of electricity, but the liability. I didn't like it, but I can understand it. Suppose there's a power surge that somehow damages my car? (lightning strike?) What if my car somehow put a surge on their power? I doubt that would ever be a problem, but to the paranoid or technophobe, I guess an argument can be made. The best you can do in such a case is try to enlighten them, not club them over the head.

YMMV, my advice is worth what you paid for it.

-M