• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Pearl Sutton
  • r ranson
  • Nicole Alderman
  • Mike Haasl
stewards:
  • paul wheaton
  • Joseph Lofthouse
  • James Freyr
master gardeners:
  • Carla Burke
  • John F Dean
  • jordan barton
gardeners:
  • Jay Angler
  • Greg Martin
  • Leigh Tate

Battery Balancing w/6, 12v 75aH agm in parallel

 
Posts: 6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

well, like the title says, I have 6 new 12v AGM lead sealed batteries.  75aH each.  Going to wire in parallel.  

I have seen many wiring schematics but they usually show 2 or 4.  If they have more than that, it's usually a series parallel hybrid.

I understand that the + and - mains coming off the ends of the parallel battery bank need to be the same length, but what about the parallel wiring to balance 6 in parallel?

I get the concept, just not sure how to do with 6.

And also, what would be the biggest 0/0 and what would be the smallest gauge I would want to use for the parallel bank?  

Does the overall length of + and - between the batteries need to be the same exact amount of length too, or just the ones going to the inverter and load?

If I was guessing, I'd say I should use 2/0 gauge welding/automotive wire among the battery bank and maybe 8 gauge going to inverter and load on charge controller?

pv goes to 40a mppt renogy
battery bank as described
2000w pure sine inverter peak 4000w

I get the concept of the fuses and where to place them and what size, just need help with the 6, group 24 battery balancing configuration.  

any help is greatly appreciated!  cheers!

ryan
 
Posts: 567
Location: Abkhazia · Cfa (humid subtropical) - temperate · clay soil
66
cat forest garden trees solar wood heat woodworking
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Is the inverter for 12V or 24V?

 
Sebastian Köln
Posts: 567
Location: Abkhazia · Cfa (humid subtropical) - temperate · clay soil
66
cat forest garden trees solar wood heat woodworking
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Assuming it is a 12V inverter, I don't see a problem wiring them all in parallel.
I would probably also run a wire from each battery pole to the inverter to keep the cable size manageable. (AWG 10 instead of 000)
 
ryan hay
Posts: 6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator


12 volt, 2000w continuous, 4000w peak pure sine inverter

i know how to wire in parallel.  i want the batteries balanced, as in this diagram, but with 6 batteries


Screenshot_2020-04-27-balancedcharging-pdf.png
[Thumbnail for Screenshot_2020-04-27-balancedcharging-pdf.png]
 
ryan hay
Posts: 6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Sebastian Köln wrote:Assuming it is a 12V inverter, I don't see a problem wiring them all in parallel.
I would probably also run a wire from each battery pole to the inverter to keep the cable size manageable. (AWG 10 instead of 000)




yeah but im also going to the load on my charge controller to a fuse box for 12v applications + the inverter (straight off batteries)

 
ryan hay
Posts: 6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

I mean I think I know how I would do it... just getting other input from y'all.  thanks!
 
Sebastian Köln
Posts: 567
Location: Abkhazia · Cfa (humid subtropical) - temperate · clay soil
66
cat forest garden trees solar wood heat woodworking
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Oh! Now I see what you mean. I don't think it is necessary. I'd do that if I was building a measuring device any every tiny difference would be relevant.

What you could do: (naming Batteries b1-b6): one wire: b1-b2-b3-b4-b5-b6-inverter, and the other inverter-1-2-3-4-5-6 .
 
ryan hay
Posts: 6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Sebastian Köln wrote:Oh! Now I see what you mean. I don't think it is necessary. I'd do that if I was building a measuring device any every tiny difference would be relevant.

What you could do: (naming Batteries b1-b6): one wire: b1-b2-b3-b4-b5-b6-inverter, and the other inverter-1-2-3-4-5-6 .



could make a huge difference as far as getting the most cycles out of my new battery bank.  check this out-

Screenshot_2020-04-27-balancedcharging-pdf.png
[Thumbnail for Screenshot_2020-04-27-balancedcharging-pdf.png]
 
Sebastian Köln
Posts: 567
Location: Abkhazia · Cfa (humid subtropical) - temperate · clay soil
66
cat forest garden trees solar wood heat woodworking
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Interesting… I did not consider that.

How about this?
3x2.png
[Thumbnail for 3x2.png]
 
pollinator
Posts: 391
Location: NW Montana, USA
127
goat purity foraging rabbit chicken food preservation pig bee medical herbs solar ungarbage
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Never thought about balanced charging before.  How does that work with a  series/parallel setup?
 
pollinator
Posts: 437
Location: North central Ontario
56
kids dog books chicken earthworks cooking solar wood heat woodworking homestead
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
My experience would say make sure that the positive inverter cable goes to the battery on one end and the negative goes on the furthest battery from it. That is how we handle all parrallel strings and how the battery company I deal with suggests. I would make sure to rotate the batteries every 6 months since you cannot equalize...
gift
 
19 skiddable structures microdoc
will be released to subscribers in: soon!
reply
    Bookmark Topic Watch Topic
  • New Topic