[coleashman]

To add more: To backup big 240V appliances that are hard-wired (EV charger, large HVAC, for example) you need to connect the backup system in the same hard-wired way to the electrical panel. For folks who are keen to make the big investment in whole-home backup, it’s a great solution. Our goal is to give folks more onramps to get started with smart battery backup, focusing on no-rewiring solutions. But I’ll say, Pila can be a compliment to whole home backup systems to add a bit more backup capacity where it matters most

[PaulDavisThe1st]

It doesn't need to be hardwired. Devices like the Generlink provide an outlet to plugin in a fossil-fuel based generator or a battery backup unit, and take care of islanding. They sit somewhere between the utility company meter and the main service panel. Power goes out ... plug into the Generlink and if your generator/backup can handle it, your entire system is running again. Not cheap though - around $1k without installation (which can vary from insanely easy to complex, depending on your situation).