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 > Battery wiring question

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Jay58

Melbourne (central east coast) Florida

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Posted: 12/29/21 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

When hooking up batteries together (lithium) to make a bank of 2 - 12v and in a year 2 more with the goal of 20 in 2 years

What size welding wire would one use to reduce loss. Keeping in mind all same length


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naturist

Lynchburg, VA

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Posted: 12/29/21 03:20pm Link  |  Quote  |  Print  |  Notify Moderator

Depends on wire length and peak current drawn.

Google wire gauge and find one of the calculators/tables online.





2oldman

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Posted: 12/29/21 04:26pm Link  |  Quote  |  Print  |  Notify Moderator

20? Seriously? Are these tiny batteries?

Jay58

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Posted: 12/29/21 06:26pm Link  |  Quote  |  Print  |  Notify Moderator

Yes really.
To each their own.

Ok

18inch each.

This is only to join the positive and negative terminal to create the battrry bank. 4/0 or 2/0 ?

time2roll

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Posted: 12/29/21 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

20? Connected to bus or just to each other?

Connected to each other I would use maybe one size smaller than the largest main cable.

Connected to a bus I would go smaller but large enough to handle max current from each battery.


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pianotuna

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Posted: 12/29/21 10:32pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

That may depend on the capacity of the battery management system. If it limits to 1C then there is little point in having thicker wire from the battery to the buss bar.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

sehunter

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Posted: 12/29/21 10:45pm Link  |  Quote  |  Print  |  Notify Moderator

If you go to the 2nd page of this "12v side of life" is what I used to make up my cables.

The 12volt side of life


Stan
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wa8yxm

Davison Michigan (East of Flint)

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Posted: 12/30/21 05:01am Link  |  Quote  |  Print  |  Notify Moderator

Ok there is a point of diminishing returns but the general rule is the bigger the wire the lower the loss.

However.. if you are only drawing say 20 amps.. 2/0 (not 20 but 2/0) is overkill
if you are drawing 200 amps 2/0 is the smallest I'd recommend.

For battery to battery at least the same size as battery to RV.


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2oldman

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Posted: 12/30/21 09:51am Link  |  Quote  |  Print  |  Notify Moderator

..

* This post was edited 12/30/21 10:01am by 2oldman *

Lwiddis

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Posted: 12/30/21 11:09am Link  |  Quote  |  Print  |  Notify Moderator

Wire size in RVs is NO time to penny pinch.

See the WindyNation chart at: https://www.windynation.com/jzv/inf/choosing-right-wire-size


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AMP Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


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