Tolerance on 12v.?

Question

Batteries

Hello.
Can you please tell me what is the voltage tolerance for devices powered by a 12 volt unit, such as various routers, etc.?
All googling will certainly lead to topics about computer power supplies and a 12v line. I don’t even know how to formulate a request.

Answer 1

This is not standardized, see the documentation for the specific device, the device itself.
Inside a small switch, for example, there may be an additional. 5v stabilizer, and such a switch accepts power from 7 to 20v without problems. But I wouldn't generalize

Answer 2

1. If you don’t feel sorry for the device - you can also plug in a 15V adapter - it should work (+ a little stronger heating may be).
Scatter: 3V (9-15V) Plug it
in and check: it works - it means everything is OK.
2. If the device must survive, then it is better to use only "native" adapters or power supplies.

Answer 3

It depends on what, if it's an iron, then he doesn't give a shit - at least 20 at least 12, the main thing is not to overdo it. And if it's a router / computer - fractions of a volt are important there! But still, even if the voltage is unstable, the power supply will equalize it and give it to the motherboard.

Answer 4

I repeat the previous colleagues: it all depends on the device.
For example, Mikrotiki (I won’t say for sure, a specific model) could be powered by voltage from 12 to 48 volts via POE.
And Ubiquiti (again, not all) is already more critical, it will burn out.
Huawei Quidwai series switches allowed the external network voltage to drop to ~ 100 volts and continued to work.