It missed us by 9 days

If you have an EV and hear of an incoming CME / large flare, could you build a rudimentary Faraday Cage around your garage and unplug for the week? Doesn't help your refrigerator and appliances, but it could prevent dangerous shorts / fires, yes?
Also, could this create a large enough surge to damage solar panels or electronics that were completely disconnected from the grid (including an entire house's electrical system, if the owners completely unplugged prior to the impact)?