24 V - Can I do this ?

[Divemaster1]

OK.... need some advice here....
We had to lift out the old 24 V battery bank as the old batteries were gonners ... (starting to generate heat by themself and not taking any charge..) .... so latched up a quick fix to have 24 V onboard for Navlights etc. as the first picture below..

Of course 135 AH, is OK (ish) , when engines are running ... Navlights, Radar, Autopilot, but not enough for domestics unless genny is running.... so here is the question ... can I set up as indicated below with two more batteries ... perhaps even bigger @ 200 AH's, or should I contemplate something completely different ?? The original ones were 500 AH each (Cranking @ 1480), which I have considered, but is not really cheap to get hold of...

<hr width=100% size=1>Alf

 

[boatone]

Alf.......

Can I suggest you call the guys at CPC Batteries a ring and ask their advice as to the best way to do this? Not sure you should mix batteries of different capacities?

<A target="_blank" HREF=http://www.boatsontheweb.com/> Website, Photo Gallery, Chat Room, Burgees

 

[mainshiptom]

Looks fine by me ! mind you I would use very thick wires that can carry that sort of amp's ! and as tont said not mix diffrent baateries.

Tom

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[halcyon]

Be tempted to link neg to plus on second bank, save a link and two connectors. so that batteries are pairs. Also match pairs for size, type and age, should give better balanced charging.

Brian

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[ColinW]

If you link the bottom pair on your diagram, Left+ to Right- same as you have done with the top pair, then you will halve the current flowing in your original link wire.


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[Divemaster1]

Thanks all,

Looks like a configuration that could work .... and confirmed now from a couple of sources...

- All to be same AH .. 135 AH
- Link between + & - on the banks
- Good Sq. size on both Paralell and Serial Connections
- Could add up to four to create a total of 405 AH 24 V and fit them all into one bay instead of using the two (cuts down wire lengths and reduces loss), which gets me closer to the original AH onboard. (+ could correct some weigth un-balance from the generator on SB side).
- Existing cables are 15 mm sq. and should be ok... would also guess that 10 or 12 mm sq. should be OK for the links, as they will be short, but will seek advise on this with the supplier before installing.

<hr width=100% size=1>Alf

 

[Piers]

Have a look here - I think this will answer all your questions.

<A target="_blank" HREF=http://bart.ccis.com/home/mnemeth/12volt/12volt.htm>http://bart.ccis.com/home/mnemeth/12volt/12volt.htm</A>

Although it deals with 6 and 12 volt, linking batts is the same whatever the flavour, and the info is really good.

<hr width=100% size=1>Piers du Pré
http://www.dupre.co.uk