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Serial/parallel battery cabling?

Discussion in 'Boat Electronics' started by Glenn Ashmore, Mar 8, 2006.

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  1. I have four L16H 6V batteries for my 840AH 12V house bank. Due to space
    and balance limitations two are on the port side of the companionway and two
    on the starboard. The fuse, battery switch and power connections are on the
    starboard side. I am running 5' of 4/0 cable between them. It has been
    recommended to me by several people that I parallel each pair and then
    series across the companionway. That does not seem right to me as it would
    put the full amp load at 6V on the longest cables.. I am thinking it would
    be better to series wire each side so the longer cables are carrying 12V and
    half the amps

    Am I missing something?

    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  2. Which brings up another quandary. The voltage drop across 5' of 4/0 will be
    small but my house alternator is capable of delivering over 200 amps and the
    inverter can draw pretty close to the same thing. Electrically the ideal
    place to tap in the alternator and house loads is under the sole in the
    middle of the companionway but I am a wee bit worried about having those
    high power connections down in the bilge.



    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  3. Did that. At maximum output I am loosing about 0.05 volt across the cables
    if the pairs are series and the sides are parallel. When it drops to
    absorption stage it gets pretty insignificant. But you always strive for
    perfection don't you? ;-)

    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
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