Connect with us

diodes in marine twin engine installation

Discussion in 'General Electronics Discussion' started by MM0TJR, Oct 7, 2012.

  1. MM0TJR

    MM0TJR

    15
    0
    Oct 2, 2012
    The attached diagram shows our Main Engine battery circuits.
    We have 2 engines, port & starboard. each has its own battery.
    each battery is "available" to either engine at the flick of the selector switch. This (we presume) is to allow starting of either engine from any battery in case one of the batteries goes flat.

    What function do the diodes perform? & why.
     

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,222
    2,696
    Jan 21, 2010
    They allow either engine to charge both batteries and prevent one battery from discharging into the other (for example, if there were a shorted cell in one)
     
  3. MM0TJR

    MM0TJR

    15
    0
    Oct 2, 2012
    pls could you clarify that -
    with the wiring shown, any engine will only charge the battery selected. not both batteries.

    also

    the switches mean that the + terminals of the batteries will never be connected together.
    supposing the diodes were replaced by conductor, then the - terminals would be connected together.but the + terminals will still never be connected therefore no current could flow between the batteries.

    or am I being even denser than usual
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,222
    2,696
    Jan 21, 2010
    You're right. If the diodes are connected like that it is done to prevent them from being charged.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-