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Thread: What can be used to reduce Voltage from battery 12V DC to 5V DC?

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    Default What can be used to reduce Voltage from battery 12V DC to 5V DC?

    I have a 12V Car Battery and I want to reduce the voltage from 12V to 5V around 2.5 to 5 amps. What can be used for this for a typical car coming off the main car battery? E.g. used for a Raspberry Pi.



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    Plenty of purpose built devices on eBay, even with a USB port output.

    Here is one for example

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    yep as porkpop mentioned plenty easy setups on ebay
    i have similar setup for my crash cams.

    Also make sure you fuse it properly.

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    If you're after something with high noise immunity - e.g. for use in a car while it is running, I suggest looking at the "UBEC" (Universal Battery Elimination Circuit) devices made for model aircraft enthusiasts.

    Here's a quick search:

    They're cheap, can cope with lots of electrical noise and are often encased in heat shrink or a small case, so they're not just a bare board. Beware that most can be switched between 5v and 6v. You don't want to try running a Raspberry Pi on 6v!

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    I have single and bulk units.
    I find the bulk unit easier
    Then run your own pre made leads from it.
    If u want to go on an expedition get a Land Rover, if u want to come home from an expedition get a Landcruiser!

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    One way is to buy a battery lead with clamps one end and a ciggie lighter socket on the other then use one of a dozen different 'Voltage regulators' plugged into the socket.
    Nearly all mobile phones come with a Ciggie Lighter plug as an accessory.
    Just check the wattage as some are 500Am , 1 Amp, 1.5Am and 2 Amp capacity.
    The only thing I found was some devices take forever to charge on the lower output.
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    Quote Originally Posted by porkop View Post
    Plenty of purpose built devices on eBay, even with a USB port output.

    Here is one for example

    Yes this is one I can use.
    Thanks

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    I found these units handy:



    As a lot of the pre made ones had leads that were both too short to route where i needed them, and had a plug end pre fitted which made it impossible to squeeze through a neat hole.

    These were handy for in-dash fitment:

    Last edited by ol' boy; 24-04-18 at 09:49 AM.
    If u want to go on an expedition get a Land Rover, if u want to come home from an expedition get a Landcruiser!

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