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 > Daisy chain cable size?

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naturist

Lynchburg, VA

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Posted: 09/01/22 06:29pm Link  |  Quote  |  Print  |  Notify Moderator

small detail: do not daisy chain a bunch of batteries. Doing so will cause them to carry uneven loads, ware out unevenly and make headaches down the line. If you have a "bunch" of them, connect them all to a single common connection point using carefully measured cables of matched lengths. To be sure, this will have the closest batteries with excessively long cables (or so it will appear), but the resistance will match, they will carry the load equally, and work much better in the long run.





swimmer_spe

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Posted: 09/01/22 06:57pm Link  |  Quote  |  Print  |  Notify Moderator

wolfe10 wrote:

If in doubt, larger gauge is better.

Can't believe there is enough difference in cost that you would go with smaller gauge wire.


About double.

Horsedoc

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Posted: 09/02/22 06:07am Link  |  Quote  |  Print  |  Notify Moderator

Why was I under the impression that with the 4 batteries sketched the wire going to the device being powered should be fed from between the two sets of 2? Same with the grounding wire.

CA Traveler

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Posted: 09/02/22 09:06am Link  |  Quote  |  Print  |  Notify Moderator

Horsedoc wrote:

Why was I under the impression that with the 4 batteries sketched the wire going to the device being powered should be fd from between the two sets of 2? Same with the grounding wire.
IF your referring to the smartgauge link and I understand what you are asking then the 2 inside batteries would supply/draw more amps than the 2 outside batteries, hence not balanced.


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Posted: 09/02/22 09:24am Link  |  Quote  |  Print  |  Notify Moderator

Wiring calculator: 4ga wire, 12.7V, 15A and 10' one way results in 12.6V at the load. Small voltage drop. Smaller wire could certainly be used.

Horsedoc

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Posted: 09/02/22 01:19pm Link  |  Quote  |  Print  |  Notify Moderator

TRaveler - Not trying to beat a dead horse. With that rationale, would the end battery in the sketch be more 'unbalanced' than the other end?

CA Traveler

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Posted: 09/02/22 03:46pm Link  |  Quote  |  Print  |  Notify Moderator

The 2 inside batteries would be the same and the 2 outside ones the same if the 2 inside batteries are connected in a balanced manor.

However I apply the term balanced to mean all batteries having the same amp draw or charge.

valhalla360

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Posted: 09/05/22 05:42pm Link  |  Quote  |  Print  |  Notify Moderator

wolfe10 wrote:


Can't believe there is enough difference in cost that you would go with smaller gauge wire.


Did a quick check:
- $1.70/ft vs $4.00/ft.

Assuming 15ft X 2, it's an extra $70.

Assuming 5amps, it's a 0.05v drop.

With 1 gauge, it's a 0.025v drop.

Really not worth the cost.


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wolfe10

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Posted: 09/06/22 07:11am Link  |  Quote  |  Print  |  Notify Moderator

When the OP said "daisy chaining batteries", I ASSUMED they were in the same location and were referring to a couple of feet of wire.


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valhalla360

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Posted: 09/06/22 07:35am Link  |  Quote  |  Print  |  Notify Moderator

wolfe10 wrote:

When the OP said "daisy chaining batteries", I ASSUMED they were in the same location and were referring to a couple of feet of wire.


If true, it's even less critical. A big part of voltage drop has to do with the length of the cabling.

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