IN-CAB USB SOCKET. IS POWER OUTPUT STABILISED???

Discussion in 'Motorhome Chat' started by wingman, Oct 29, 2014.

  1. wingman

    wingman Funster

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    USB advice guru required (n)

    I have a factory fitted USB socket in my MH Peugeot cab and wish to use it to charge/power a small Garmin external GPS device. I've used the socket for music etc with no probs, but am reluctant to try it with the small GPS unit because I'm unsure whether the power-out is stabilised.

    The reson I'm reluctant is that I have had a bad experience with a Pound Shop 12v cigar lighter-to-USB Adaptor where it mullah'd a phone!

    I'm aware that the two scenarios aren't connected, but I'm now wary of buggering up ( a technical term!) another device.

    OR, have I answered my own question whereby if the USB works ok charging/powering an iPod, it should be stabilised and therefore ok with the external GPS.

    Should I NOT have this unit plugged in and powered from the USB at ALL whilst in transit, but just use it's internal battery?

    PS. The GPS has only one charging method and that is via a USB lead.
    PPS. I would be particularly interested from Funster's who use an iPad or iPad mini who use these external stand-alone GPS modules.

    Thanks
    James
     
  2. John Laidler

    John Laidler Funster

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    I charge my Satmap GPS using the USB socket I fitted, both on the move and when stationary. Haven't had a problem with it so far.
     
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  3. Steve

    Steve Funster Life Member

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    just check that the output is high enough, some of the modern kit likes a coule of amps or so.
     
  4. Jaws

    Jaws Funster Life Member

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    Ummm.. anything from a pound shop should be viewed with scepticism !!
    Get a half decent one at about £7 to £10 and it will not only have the equivalent of a T7805 voltage limiter in it.. it is more likely to have a proper voltage control circuit with fold back control to ensure the output remains at 5v

    Having said that, in theory even something with a 7805 and a couple of capacitors fitted to it should be fine.. trouble is there are soooo many cheapo control chips around nowadays the cheap things really should not be trusted
     
  5. TheDogMan

    TheDogMan Funster

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    got an ipad 5 charging lead from a pound shop, yes cost a pound as opposed the £12.95 for an apple one, would have taken 24 hours to complete a charge thats if I had left it plugged in !!! after a couple of hours it was so hot it was almost glowing and the I pad only registered a 8% battery level. get the decent stuff and it will be fine
     
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  6. wingman

    wingman Funster

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    Thanks for the replies lads. The £ shop episode is behind me now :crying:but I would still like to hear if the peugeot USB socket is stable enough to run the stand-alone GPS module.
    Taa.
    James
     
  7. daveandsan

    daveandsan Funster

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    I don't know if this has had anything to do with your problem but I was told not to have any devices plugged in while starting the engine as it may damage them.
     
  8. Badknee

    Badknee Funster

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    Fire brigade say 80% of house fires are from phone chargers left switched on either with phone or not
     
  9. gozomike

    gozomike Funster Life Member Life Member

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    Hi. I think you are meaning the USB socket in the large lockable box in the centre of the cab. I have one which is part of the media player and is intended for a USB stick with MP3 files on it. I am not convinced this is intended to power external devices and probably could not supply enough current to do so.

    Mike
     
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  10. wingman

    wingman Funster

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    That's the one Mike. It's in the lockable box - centre cab. Good point! It's really only for playing media stuff via the radio system. Doh, why didn't I think of it that way.

    And the other poster is right about not plugging in delicate gizmos and then starting the engine. Might cause a surge?

    Thanks
    James
     
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  11. Jaws

    Jaws Funster Life Member

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    As the voltage is tied down to 5v ( either cleverly and properly or indeed cheap and nastily ) the input voltage would either have to drop below 5v ( in which case you aint going anywhere to say the least !! ) or exceed 18v ( minimum ) as that is the highest input voltage the really cheap control chips are good for.. Although most are good for 30v !!
     
  12. wingman

    wingman Funster

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    Hi Jaws.
    To paint the full picture, I've just started using an iPad Mini in conjunction with CoPilot. As the Mini has no integral GPS, I've got an external Garmin GPS unit.

    At the moment, when I return from a journey, I charge this gizmo using the provided and approved USB lead plugged into an official Apple iPhone charger. Obviously, the GPS charge decays during a journey and if I'm not on EHU at the destination I'd have no way of recharging, save for buying a stabilised 12v cigar-to-mini USB charger. That's why I thought of utilising the on board USB socket.

    I'd rather not use yet ANOTHER cigar plug because I already have a daisy chain of the bloody things powering anything from e-cigs to a dash cam!

    What d'you reckon are my options? Check the voltage of the on-board USB and go for it? (Assuming I know the power carrying pin-outs of the USB - which I don't (n)).
     
  13. Jaws

    Jaws Funster Life Member

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    Wellll.. USB has been standardised for the past 18 years ( at least as far as the voltage supply ).. I should think there would be some pretty well published court cases if a vehicle maker fitted a socket that did not comply ;)

    But if you want to check.....Here are the pin out connections for you W M.(y)

    [​IMG]
     
  14. John Laidler

    John Laidler Funster

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    I would fit a proper USB socket if the one you have found doesn't provide suitable power. Much better option than faffing about with cigar lighter adaptors.
     
  15. wingman

    wingman Funster

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    Thanks again for all of the replies Gents.
    Went out into the sunshine to have a play with the stuff this afternoon. Took an iPod with me, more as a test rig than for the music. Checked the cab USB output voltage too.
    The iPod charged ok, so I gave the GPS gizmo a try. The red flashing LED charging indicator light come on and all seems to be ok.

    Nothing blew at least! (y)
     
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