Thanks for the reply.I thought about this too but you have to remember the battery pack in the Tucson is +13.8kw. Finding a battery with even half that capacity is extremely expensive.
Look at this model for example: EcoFlow DELTA Pro Portable Power Station
You'll need two of these just to get to half charge and you're looking at dropping a cool10k. It would only be worth it if you're adding solar panels to your roof and have them charge these bad boys to power your entire home.