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Thread: help needed for backup battery Diode type

  1. #1
    Maximum Bitrate bertybassett's Avatar
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    help needed for backup battery Diode type

    I've installed a 12v 2.2Ah back battery along with a 1N4001 Diode. When I used the carputer the diode overheated and melted. What size diode should I be using or was it just a faulty diode.

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    Quote Originally Posted by bertybassett
    I've installed a 12v 2.2Ah back battery along with a 1N4001 Diode. When I used the carputer the diode overheated and melted. What size diode should I be using or was it just a faulty diode.
    This is my info:

    Pw-70, ITPS, 12V 2.7Ah Battery, and the MBR3045 Diode.

    No problems so far (4months and counting)

    VWTronics

  3. #3
    FLAC Mastero's Avatar
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    MBR3045 or MBR6045

    Any Diode with at least 20+ Amps

    Mastero

  4. #4
    Maximum Bitrate bertybassett's Avatar
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    should a diode get hot?

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    Yes, Diodes will get hot. They pass current, adding alittle bit of resistance to flow (alot of resistance in reverse). I don't know how much power your system draws, but you might try like a 1N4005. You might also need to look for a rectifier diode (same as a diode, just much larger). Radio Shack should have a large enough one.

    You could also go with a bridge rectifier, which is really 4 diodes in a square configuration. They're typically flat, and a heatsink can be mounted to some of them. Clip off the unused poles.

  6. #6
    FLAC Mastero's Avatar
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    Yes depends how much power is passing through it ... MBR3045 shall require heatsink

    Mastero

  7. #7
    Maximum Bitrate bertybassett's Avatar
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    so if I get a MBR3045 what type of heatsink should I use?

  8. #8
    Maximum Bitrate bertybassett's Avatar
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    From the link below which one should I use.

    http://uk.farnell.com/jsp/search/sea...archbut=Search

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    I'd look for an old Pentium II Slot 1 style heatisnk and drill moutning holes in it. You can find them with fans if needed, but that should be large enough I'd think, cheap, and easy to find.

  10. #10
    FLAC Mastero's Avatar
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    heatsink does not mean a major Big type a small To220 type will do the job ...

    Any will do .. (farnell link)

    Mastero

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