Powering 240v USB ports from 12v

[vas]

gregcope:

although the discussion seems to be going another way, have a look at this thread I started a year ago on the mobo forum.
Gives some more info and more details on the usb charging issue.

http://www.ybw.com/forums/showthrea...ing-from-12V-or-24V-using-droppers&highlight=

cheers

V.

 

[MarcJ]

Does it deliver those rated amps on all the ports without letting out magic smoke, getting really warm or turning to cheese?

Yes seems ok, I've had 3 x 2A phones charging at the same time - haven't got 4 to try! Comes with a 3 year warranty...

 

[gregcope]

gregcope:

although the discussion seems to be going another way, have a look at this thread I started a year ago on the mobo forum.
Gives some more info and more details on the usb charging issue.

http://www.ybw.com/forums/showthrea...ing-from-12V-or-24V-using-droppers&highlight=

cheers

V.

Many thanks Vas. I had always wanted details on how the different usb specs worked.

 

[davidpbo]

Ooh, might be replacing my 12V to USB twin with one of those with the volunteer.

One thing I will be doing soon is fitting a switch so the socket is not powered when not needed. Mine has a tiny led indicator light which is on all the time. i know the current draw is probably minimal when not in use, but I don't like leaving anything on on the boat if I can reasonably avoid it. Apart from anything else our boat battery charging is limited since we have an outboard and 10W solar panel.

Under no circumstances would I mess with the USB sockets fitted to a mains socket. I have no idea what the electrical isolation is between the mains and the USB. When I fitted some mains sockets on my boat one of which has USBs on it I decided to go for a known good make and chose MK.

 

[[70521]]

You can buy AC sockets with USB charging points.

If you have an old style cigar lighter you can get an adapter for that.

 

[maby]

You can buy AC sockets with USB charging points.
....

This thread started with a proposal to fit those and modify them to charge when the 240v AC supply is disconnected!

 

[[70521]]

This thread started with a proposal to fit those and modify them to charge when the 240v AC supply is disconnected!

I missed that.

Personally, I'd not touch that with a barge pole.