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Author Topic: Ring main... Ring battery bank?  (Read 2211 times)
SteveH
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« on: July 01, 2009, 12:19:40 PM »

 I've had this idea in the back of my mind for quite a wile.

 Why not connect a parallel battery bank so that the positive terminals & negative terminals are in a ring. I can see no disadvantage to doing this, except for the addition of two interconnecting wirer's....

 The advantage would be to even-up all the inputs to the bank & would effectively double the CSA of the interconnects as there would be two paths for current to follow along...

 The caveat would be that all inputs & outputs must be connected to diametrical apposed points on the ring as bellow....



 Just a simple idea that might have been missed.... whistlie
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Justme
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« Reply #1 on: July 01, 2009, 01:51:32 PM »

Erm your've stumped me there.

Will have to think about it.

Initial thoughts are you still want all the loads & chargers connected at one point.

But use two sets (one + & one -) of your diametricly apposed points to create one central tap for them.

I think vastly over complicating it.

Fix all + together, fix all - together, fit all + in & out to bat 3, fit all - in & out to bat 5 (might be 2 & 6 lol I cant be arsed to work it out)
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biff
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« Reply #2 on: July 02, 2009, 10:15:05 PM »

hi steve,
       wot about the bit that says,,"its necessary to keep the connections as short as possible",?,
            stir.errr,    biff whistlie
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Justme
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« Reply #3 on: July 02, 2009, 10:31:43 PM »

hi steve,
       wot about the bit that says,,"its necessary to keep the connections as short as possible",?,
            stir.errr,    biff whistlie

Thats only cos people dont use nice thick costly cables. With the right sized ones you can use longer cables. You really need to minimise the number of connections to reduce losses (after using thick cables that is).
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SteveH
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« Reply #4 on: July 02, 2009, 10:55:41 PM »

hi steve,
       wot about the bit that says,,"its necessary to keep the connections as short as possible",?,
            stir.errr,    biff whistlie

 So are you suggesting I put the battries under the PV & the wind turbine on the roof just to make the cable runs short...? Grin

  whistlie
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Ivan
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« Reply #5 on: July 13, 2009, 12:53:30 AM »

If you're planning on drawing high currents from your battery cables, it's well worth keeping the length of cable between each battery terminal and the common point, the same length, otherwise the slightly different resistance of different cable lengths will mean cause power to be drawn preferentially in favour of the paths of least resistance. I think there were some threads a year or two about this, with diagrams.

Personally, I like the idea of ring main on low voltage DC. It makes sense to me, although the diagram didn't.
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