portable solar array and large battery to charge up volt?

I rent a house and can not add solar panels or a home battery to the house. I do have a large and very sunny yard to utilize. Anyone looked in to hooking up a solar array to a storage battery and then using the battery to charge up the electric car (Volt and Bolt in my case) during the night? I drive about 6 miles a day and my wife will soon get a Bolt and be driving 12 miles per day. If we have to use the home's outlets sometimes, no big deal.