Question USB 12v Step Up Connectors for Router Via USB

[Gamefreaknet]

I have a Solar Portable Powerbank Rated at 5v 2.4a One Port, 5v 3a the other port and it has solar and USB charging. I have noticed there are some devices that supposedly "step-up" 5v to 9v or 12v 1a/2a/3a.
Are those USB devices safe to use? If so (or not) what would you recommend I do?
(Note this is for camping where mains power isn't really an option unless I buy a bulky power unit)

 

[kanewolf]

I have a Solar Portable Powerbank Rated at 5v 2.4a One Port, 5v 3a the other port and it has solar and USB charging. I have noticed there are some devices that supposedly "step-up" 5v to 9v or 12v 1a/2a/3a.
Are those USB devices safe to use? If so (or not) what would you recommend I do?
(Note this is for camping where mains power isn't really an option unless I buy a bulky power unit)

What are you trying to power?

 

[Gamefreaknet]

What are you trying to power?

Router. The Plug it came with rates it at 12v 1.5A DC

 

[kanewolf]

Router. The Plug it came with rates it at 12v 1.5A DC

What does the router say the power wattage is ? 12VDC at 1.5A is 18W. Your 5V supplies have a max of 15W (5V at 3A). There will be some loss with the step up voltage conversion.
Do you not have 12V batteries as your primary off-mains supply?

 

[Misgar]

A circuit that increases the supply voltage is known as a "DC-to-DC boost converter".
https://en.wikipedia.org/wiki/Boost_converter

You would need to measure the maximum current drawn from a 12V DC supply by your router with an ammeter. The power supply that came with the router might be capable of supplying 1.5A, but it's likely that the router only draws 0.9A from the supply.

12V x 0.9A = 10.8W, so a DC-to-DC converter connected to a 5V 3A (15.0W) power bank should be OK.