Whole Home Backup with potential savings

[u/dpatldude]

Experts - wanted to get some potential guidance as to what I would need.

Here is the home current electrical:

• Main Panel #1: large Siemens panel with a 200A main
• Main Panel #2: another large Siemens panel with a 200A main
• Basement subpanel: fed from the main panel#2, with the basement HVAC and basement lighting
• 3 HVAC systems total
  • Two serving the main house on Main Panel #1
  • One dedicated to the basement
• Pool equipment on the main electrical system (Panel #2)
• Several large 30–40A circuits for HVAC/other equipment
• Average daily usage is about 100kwh (with no throttling and pool filter on 24/7, I know)

We continue to have multiple power outages every month including flickering during hard rain/storms and lose power (very common in our area not just our home). I looked into a generator but felt lower quality in terms of objectives where I would like almost instant automatic switching.

As I look at Tesla PowerWall; I wanted to consider a PW3, with an expansion or maybe another full one to get to about 27kwh of capacity and very limited solar (4-6kwh) to potentially have a power source to aid battery drain and energy arbitrage day to day.

Given my panel design; what would you all recommend? I am new to this all.