My solution:
1. Build a Faraday cage or three,
2. Buy multiples of charge controllers and inverters to hold in reserve in your Faraday cage(s,)
3. Stick with lead acid batteries, which do not use microprocessor BMS.
It's a matter of preparation and survival.
I choose to forego the boutique batteries and all-in-one devices in favor of having electricity in my off-grid cabin after an EMP event.