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diy solar

Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review

cinergi said:
While mine aren't XUBA (they're Shenzhen)
Click to expand...
Minor but worthwhile clarification:
I suspect you are referring to Shenzhen Basen (from context), Shenzhen is a huge city in China, roughly the size of New York. It is not the name of any one company. Virtually every reseller of the EVE cells either has Shenzhen or Dongguan (a sister city that is also a huge export and manufacturing hub) in its name. For example:
  1. Shenzhen Xuba
  2. Shenzhen Luyuan
  3. Shenzhen Basen
  4. Shenzhen Senberry
  5. Shenzhen Unis
  6. Shenzhen Haomi
  7. Dongguan Lightning
  8. Dongguan Billion
  9. Changsha Deligreen
 
Received my 16/280ah today from Amy. Here's 1,120ah 12v setup for the charger I have.
Going to parallel them in three stages 3.4v,. Then 3.5 and then 3.6 on the dc bench supply shortly.
 

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Kommy000 said:
Egg, do t have enough to double them. Anybody knows where maybe I can get heavy duty busbars copper tin plated on American side? Dont want to wait again for boat shipment. Or should I just make my own out of copper pipe? Any recommendations on how , what size, for 200a max current on 48v system?
Click to expand...
Find out what gauge of wire you need. From there you can figure out the cross sectional amount of wire you need.
Which in your case is a LOT less than a pipe made of copper. :)
Many make their own out of copper pipe and to be honest, I have never heard of one being less than they need if they hammer the sheeeet out of the pipe to flatten it out. :)

I hope this helps. :)
 
I ordered my xuba cells with double busbars.
My question is this, if you double up the busbars and add a BMS/balance lead, do you need to replace the supplied screws with slightly longer ones or will they still have enough threads in contact? I'm assuming you do not need to use a locking washer as well?
 
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Solarfun4jim said:
I ordered my xuba cells with double busbars.
My question is this, if you double up the busbars and add a balance lead, do you need to replace the supplied screws with slightly longer ones or with they still have enough threads in contact? I'm assuming you do not need to use a locking washer as well?
Click to expand...
I am using 280 Ah cells and I have doubled up the bus bars and using it on my mobility scooter. In spite of the jostling they are still holding up just fine. :)
 
It is a pity the supplied busbars are not slightly longer, that way you could connect the cells in either direction. The inside of the slots to connect the cells side by side and the outside of the slots to connect length ways!
(Maybe a suggestion for AMY) ;)(y)
 
Solarfun4jim said:
It is a pity the supplied busbars are not slightly longer, that way you could connect the cells in either direction. The inside of the slots to connect the cells side by side and the outside of the slots to connect length ways!
(Maybe a suggestion for AMY) ;)(y)
Click to expand...
Amy can supply longer busbars for an 8s square pack, as well as wider busbars
 
Solarfun4jim said:
I ordered my xuba cells with double busbars.
My question is this, if you double up the busbars and add a BMS/balance lead, do you need to replace the supplied screws with slightly longer ones or will they still have enough threads in contact? I'm assuming you do not need to use a locking washer as well?
Click to expand...
I highly recommend using stud and locknut no matter what, you ensure you have full thread engagement. You want as much as you can get with these small aluminum threads. Still need to be careful to not tighten too much.

These are long enough for double bar and balance lead:
www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com
www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com
 
theo886 said:
I highly recommend using stud and locknut no matter what, you ensure you have full thread engagement. You want as much as you can get with these small aluminum threads. Still need to be careful to not tighten too much.

These are long enough for double bar and balance lead:
www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com
www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com
Click to expand...
Yeah, I agree. I also decided to use some red thread locker on the studs. Was going to use blue but I don't want to worry about the nut turning the stud when I tighten it. Also I got my hardware from Amazon.



I bought 20mm grub screws. Plenty long enough for me.
 
David S said:
Cells all tested within .006 of one another at:
13.293
23.299
33.296
43.299
53.298
63.296
73.296
83.298

All cells in good repair, all packaging excellent. Bus bars not what I'd hoped for, but otherwise nicely done Xuba.
Click to expand...
Yes, the bus bars you can blame on EVE rather than Xuba. That's what the manufacturer sends with them. They are supposed to be plated copper.
 
Gazoo said:
Yeah, I agree. I also decided to use some red thread locker on the studs. Was going to use blue but I don't want to worry about the nut turning the stud when I tighten it. Also I got my hardware from Amazon.



I bought 20mm grub screws. Plenty long enough for me.
Click to expand...
You confuse me now. Wasn't it you [maybe I am wrong probably] that said to put some sort of oxide protector on the bolts? And now you say locktite?
I maybe have the wrong person though soooo, apologies ahead of time Gazoo. :)
 
theo886 said:
I highly recommend using stud and locknut no matter what, you ensure you have full thread engagement. You want as much as you can get with these small aluminum threads. Still need to be careful to not tighten too much.
Click to expand...

Speaking as someone who has stripped the threads in his cells, this gets a BIG PLUS ONE from me. :)
 
ghostwriter66 said:
C'mon man ... lightly sand?? ... so we get our batteries ... unpack them ... hit the terminals for a second with a grinding brush on a dewalt cordless drill .... then dip a rag in some gas (yeah we seem to have allot of that available just laying around - LOL), wipe off the terminal -- throw on some homemade copper busbars from plumbing cooper pipes we get at HD - and call it a day -- and it all works perfect .... I actually was starting - or trying - to follow a previous thread of the best cleaner to use on the terminals and on like page 300 i was like - WTH !! -- some of these guys are drinking waaaaaay to much soy milk ... and figured gas would work fine ...
Click to expand...
I'm going to use some industrial/scientific grade 99.5% isopropyl alcohol I have plenty of (thanks, covid). Makes great hand sanitizer mixed with aloe gel, and a few drops of vitamin E oil, but have to order it by the gallon. Yes, my wife works in a lab.
 
SherylinRM said:
You confuse me now. Wasn't it you [maybe I am wrong probably] that said to put some sort of oxide protector on the bolts? And now you say locktite?
I maybe have the wrong person though soooo, apologies ahead of time Gazoo. :)
Click to expand...
My build will be stationary in my apartment so I really don't need to use anything to prevent oxidation. The reason I am using red Loctite is so the stud (grub screw) won't turn when I tighten the nut.

I think you got some great suggestion to prevent oxidation for your build. No need to apologize... :)
 
Gazoo said:
My build will be stationary in my apartment so I really don't need to use anything to prevent oxidation. The reason I am using red Loctite is so the stud (grub screw) won't turn when I tighten the nut.

I think you got some great suggestion to prevent oxidation for your build. No need to apologize... :)
Click to expand...
I did and yes thanks.
Ok I mixed you up with someone else. Sorry about that. :)
 
@Steve_S

With regards to the busbars supplied with the xuba 280Ah cells, i believe they are rated for 300A. In my 24V system they are only going to see a working maximum of 125A continuous(250A peak for a few seconds surge loads) but day to day, much lower values that this. I know we are meant to derate the busbar values for margin of safety, hence folks doubling up, but what is the opinion on the single supplied busbar to handle 125A?
I wouldn't think this should be an issue. Anyone care to put me right?
 
cinergi said:
How big are they? The ones I got are 2mm by 15mm which is like 110 amps
Click to expand...
Yes, mine are the same. Where did you manage to get the spec details showing 110A?
It surprises me, for a 280Ah cell that can discharge 1C , that the single busbar sold, would only be rated for 110A
I thought i had read previously on this forum that they were rated for 300A, but that it would be wise to derate them for a safety margin!
Obviously i would have liked this confirmed, but now you have thrown my assumptions into question. :cry:
Thanks for the feedback.
 
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