Usb AC: Safe or Deadly?

[USBACPOWER]

Hi, I am wondering how, and if it is safe to use a homemade usb to ac power converter. If there is something I am missing, that this video doesn't tell, please let me know.
https://video.search.yahoo.com/sear...912ea38b70c133ff8b41d0428e201d44&action=click

 

[USBACPOWER]

here are the components I would buy:
https://www.amazon.com/Converter-Qu...o+dc+12v+step+up+power+module+converter+cable

https://www.amazon.com/Enkey-Power-...id=1506395455&sr=8-9&keywords=dc+ac+converter

https://www.amazon.com/uxcell-Charg...TF8&qid=1507425295&sr=8-4&keywords=car+socket

I know the last one isn't necessary, but it would make it more convenient.

 

[USBACPOWER]

Are the power specifics right for this guy's project?

https://video.search.yahoo.com/sear...=7245953c9f3df2fbab6c3e85431d5c03&action=view

 

[USBACPOWER]

I could also make a power bank to power my 110 ac circuit:

Buy:

https://www.amazon.com/Dual-USB-Pow...8653&sr=8-2&keywords=power+bank+circuit+board

https://www.amazon.com/Yeeco-Adjust...-2&keywords=3.7+volt+to+5+volt+regulator&th=1

use an old phone battery

 

[USBACPOWER]

Just wondering if I have a good idea or if I should give it up

 

[AnalogKid]

Give it up. Even at very low power levels, 110/220 Vac is lethal. Also, assuming you want to use this somewhere other than on a workbench, you will have to put the electronics in some kind of enclosure with connectors for external cords. An enclosure that is safe will cost more than the modules. Also, two converter modules in series is very inefficient. Only about 50% of the battery power will be available at the AC output.

ak

 

[USBACPOWER]

ok bye

 

[USBACPOWER]

what about a power bank?
If I use 3 old phone batteries connected in parallel, it would triple the life, right?

 

[Harald Kapp]

Which load do you want to power?

USB is totally inadequate for most purposes where a 110 V load is involved. Even if your power bank(s) were able to deliver 1 A at 5 V, this is just 5 W. Stepping this up to 110 V will at best have an efficiency of 80 % (probably much less), so only <=4 W are available on the 110 V side.
Use a 12 V source (e.g. car battery) and get a commercial inverter. With 12 V and e.g. 10 A, you get 120 W input to the inverter, that is approx. 96 W output power.

 

[USBACPOWER]

Im giving up on usb ac power but not on a power bank. Where can I find cheap or free old li-ion batteries?

 

[USBACPOWER]

change of voltage regulator:

https://www.amazon.com/Mini-DC-Volt...7593076&sr=1-3&keywords=voltage+step-up+to+5v