Simple answer:  No.

Customer routers and CPEs are a mix match of a) voltage - 5v, 9v, 12v, etc and b) connector - dc barrel, USB, molex, etc.  Fixed wireless and fiber for certain and I have to assume it's the same story with DSL/cable.

On Fri, Apr 14, 2023 at 9:06 PM Sean Donelan <sean@donelan.com> wrote:
On Sat, 15 Apr 2023, Joe Greco wrote:
> Ubiquiti EdgeRouter PoE 5 can use 48VDC.

If both PV battery walls and broadband CPE supported Power-Over-Ethernet
as a backup power source, that would work too.  POE supports greater
distances than USB-C.