backup power - what do I need?

So I have been slowly prepping here and there. I have a solar array that's pretty great and gives way more power than I need on average, but during winter it's severely lacking. Like...300kWh vs my 1.1k kWh usage. I use an average of 37kWh per day, but the vast majority of that is from our EVs. I've been looking at batteries, and it feels like doing something like portable Anker, or Bluetti batteries are the way to go, but then I've seen people recommend generators. Either way I need a new thing built into my breaker to accept a generator... but what should I do? Do I just need a cheap sub $1k generator? or do I need to get a few portable batteries? or a giant Tesla power wall? I'm assuming we won't have months or even weeks without power, so I'm talking more a day or a few days here...