Fairy Lights?

Discussion in 'Tech/Mech General' started by Armytwowheels, Jun 19, 2014.

  1. Armytwowheels

    Armytwowheels Funster Life Member

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    Cannot ask Colin as he is away, so stupid question coming your way!

    Can someone have a look at the pic and tell me if these lights will work on 12v. I particularly like these and would like to cut the 3 pin plug off and get C to wire them up for 12v use.

    Thanks
    Sandra
     

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  2. DavidG58

    DavidG58 Funster

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    Hi Sandra

    You will get better informed replies from others, but the 21V bit would say no for me

    David
     
  3. NickNic

    NickNic Funster Life Member

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    No, they won't.

    The "Sec" on the plug means Seconday Voltage which is the output voltage of the transformer so they need 21v to work. Depending on what they are they may glow a bit at 12v but not light up properly.
     
  4. Armytwowheels

    Armytwowheels Funster Life Member

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    Oh that's a shame, yet something else to give away. They are LED fairy lights that I had up in the house and was hoping to have them in the van.

    Thanks for your help guys.
     
  5. NickNic

    NickNic Funster Life Member

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    If you have an inverter you could run them through that.
     
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  6. NickNic

    NickNic Funster Life Member

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  7. hilldweller

    hilldweller Funster Life Member

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    No harm in trying them, only need a couple of bits of wire sticking on the leisure battery. That is NOT the transformer but direct to the LED wire that plugs into it taking note of polarity.
     
  8. Armytwowheels

    Armytwowheels Funster Life Member

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    Pulled wire out of 3pin plug and now have this -

    From the diagram on the plug I assume the thin pin is the + live wire and the thicker one is the - neutral wire? Now have to get this plug off without mixing up which wire is which.

    If I get it wrong how much is it going to hurt when/if I put the wires on a 12v leisure battery ( of which there just happens to be one hanging around in the garage).
     

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    Last edited: Jun 19, 2014
  9. TheCaller

    TheCaller Funster

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  10. TheCaller

    TheCaller Funster

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    From what I have read elsewhere, I believe the only ill effect of reversed polarity on LED lights is that they just don't work. So you can try it one way, then the other if needed. The usual disclaimers apply. :RollEyes:

    But once you take that plug off, you've burnt your boats for ever using the lights with the mains adapter. It won't go back on & I don't know where you would go for a re-wireable version of that plug.

    Someone who does these things more often may be able to point you in the direction of a suitable socket that you could connect to your 12v battery to try it out, or to the power supply NickNic pointed to if 12v isn't enough. That way you could still use it with the mains adapter as well if you ever wanted to (such as when on EHU).

    Can you confirm that you don't have an inverter in the van?
     
  11. hilldweller

    hilldweller Funster Life Member

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    For testing just wrap wire round the pins, hold it in place with tape.

    Or cut off a few inches in then you can re-join if you fail.

    It won't hurt you if you "jab" the wires.
     
  12. sb8263

    sb8263 Funster

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    split the wires back about 6 inches,,then cut them,,if they dont work, just connect again with small block connectors and tape up...:thumb:
     
  13. Armytwowheels

    Armytwowheels Funster Life Member

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    That's too sensible! :Doh:

    Thanks, even I can do that.

    Actually we do have an inverter - 400w, will have to check with Colin that these lights would not be too much of a drain if used with the original plug. At least I can use them for a festival in a couple of weeks time, the solar panel should take care of any drain.

    Thanks for all your help guys, really appreciate it.
     
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  14. Gorse Hill

    Gorse Hill Funster

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    Led are not polarity conscious so as pointed out they just won't work the wrong way round
     
  15. hilldweller

    hilldweller Funster Life Member

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    Which makes them 100% "polarity conscious" in my book.
     
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  16. TheCaller

    TheCaller Funster

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    They will be fine. The power supply only puts out 3W, so at most uses 4W. Just having the inverter switched on probably uses more than that, but you can run them for hours at that rate. :thumb:

    It would be more efficient to run them via the power supply NickNic referenced, but you would never recover the cost, given that you already have both an inverter & solar panels.
     
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  17. sedge

    sedge Funster

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    Sheesh Sandra!

    LED solar fairylights are approx. £5 in B&M. But if you are happy with blue, they were cheaper.
     
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  18. Wildman

    Wildman Read Only Funster

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    we use solar powered LED's cost £3.50. 3 strings is all the light we ever need in the van and tis free leccy.
     
  19. Armytwowheels

    Armytwowheels Funster Life Member

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    But these are special. It's my little project now I will not be beaten.
     
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  20. jhorsf

    jhorsf Read Only Funster

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    :Rofl1:
     
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