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diy solar

I WARNED YOU ALL! MB31/MB30 huge issue terminal snapping off

ok guys....seriously now...I'm talking about 16x280k shipping from a warehouse in Poland and delivery to Greece all included in the price....final price 1060 euros
 
So that's about 69.56 USD per 280AH cell delivered, or 0.248 USD/AH. I'm paying 84.79 USD per 314AH cell delivered, or 0.27 USD/AH. So youre paying about 8% less than I am per amp hour.

Of course, we don't know what the differences in shipping costs, taxes, and customs duties really are between our two countries.

But from my perspective you are getting a a good deal. Congratulations!
 
I see we have to be mind readers now ;)

I just paid £890 for 16 LF280V3 delivered all taxes included.
 
Another thread ruined by "THE CHATTERS"

TOPIC -

I WARNED YOU ALL! MB31/MB30 huge issue terminal snapping off​

 
Well well well, didn't I tell you all, you better wait for these new cells to establish some cred before buying

Haaa now that’s funny… how many times have we all wished we had the pleasure of saying that…
One of the few Rich pleasures in life..

Doesn’t matter the topic , it’s just a rare time that one can really smile when it happens..!

J.
 
Looks like 18650 store finally looked at their reviews .....the review about the terminal breaking off is gone.
Did you notice the 4 star review by Richard K.? He stated that one of his lugs fell off.

"I'm running a 48V (16S) System using EVE MB31 Grade A Cells - 3.2V LiFePO4 314Ah Batteries to make up my bank.Great batteries with the exception of the mounting lugs.I reached up to unbolt the + lead from the bank and when I did the lug popped right off.It was not overly tight and I had attached/removed the lead more than once but a slight torque on the system and I suddenly don't have an attached lug anymore.As far as the batteries doing what they're supposed to - store energy - they work beautifully but the tender lugs keep me from giving them five stars.
Richard K."
 
Looks like 18650 store finally looked at their reviews .....the review about the terminal breaking off is gone.

18650's fall from grace is complete as far as I'm concerned.

I feel duped, I would cheerlead for them as they were giving out test reports and had excellent prices.
Then they stopped sending reports despite claiming they would on their site.
They constantly do BS on the shipping prices.
They falsely claim there grade B cells would test to rated capacity (but hey at least they admitted they were grade B)
Now instead of acknowledging this terminal problem they are deleting reviews and sweeping this issue under the rug. Chinese Tactics 101.

Unacceptable! Back to Luyuan!
 
how are you guys snapping the double termanals off. I have been putting them togeather and taking them apart for a year now and no issues, but I use a torque wrench to tighten them to the proper amount if that makes a difference. I spicificly wanted these termanals for the larger contact areas.
Can I ask what torque setting you are using? Thanks
 
On my Winston cells I am using 30 ft pounds of torque they are 14mm x 1.75 thread for the people worrying about how much torque to apply BUY BETTER CELLS
30 foot lbs, are you serious? that's like a torque setting for a tie rod end haha
 
Can I ask what torque setting you are using? Thanks
4Nm or 36 in lbs is all I ever use on Eve or CATL cells for threaded post, welded stud or double hole terminals. One 6mm bolt or nut on grub screw torqued to this exerts 800lbs of force. Buff both contact surfaces with Scotch bright (maroon pad) just enough to remove the oxides, gently blow off surface and taped holes using care to not direct air at pressure vents. Use a thin layer of No-Ox-Id A special grease on the contact surface. Note if it’s cold you may need to warm it up to spread. Absolutely no contamination on the contact surface like cat hair. Torque and check torque a few hours later and a few more times in the future.
 
Would be interesting to see a test with cat hair between the connection surfaces. Oh, without the hair still attached to the cat of course.
Actually it’s measurable, I don’t remember the value. I always use an internal resistance meter from terminal to terminal when I build. One was off from the others so I removed it and looked closely there were a couple of orange hairs attached that were extending from the edge of the buss. I cleaned it off and scraped out the top layer of the antioxidant grease before using it again. Now I’m a bit OCD and kinda have a clean operating theatre when connecting cells. Dang cat hair gets everywhere. I’m a freaking fur magnet.
 
Actually it’s measurable, I don’t remember the value. I always use an internal resistance meter from terminal to terminal when I build. One was off from the others so I removed it and looked closely there were a couple of orange hairs attached that were extending from the edge of the buss. I cleaned it off and scraped out the top layer of the antioxidant grease before using it again. Now I’m a bit OCD and kinda have a clean operating theatre when connecting cells. Dang cat hair gets everywhere. I’m a freaking fur magnet.
How about just getting on of these?
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14mm x 1.75 threads in aluminum... the copper side rates higher. buy junk, deal with junk.. your choice.

14mm x 1.75 threads in aluminum... the copper side rates higher. buy junk, deal with junk.. your choice.

so I looked it u[p copper threads on a M6 is still max 23ft-lbs aluminum is 14ft-lbs but I still don't go anywhere near the limit as I am only using about 5 ft-lbs or the recommended value. but why are you talking M12 do the Winston's have bigger terminals?

there is a big issue where everyone seams to think tighter is better, and yes in some applications it is, well most really, but we are not holding two frame pieces together, we are only torquing to a value to hold electrical components snug which in most cases is a lower value than what we are using.
 
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so I looked it u[p copper threads on a M6 is still max 23ft-lbs aluminum is 14ft-lbs but I still don't go anywhere near the limit as I am only using about 5 ft-lbs or the recommended value. but why are you talking M12 do the Winston's have bigger terminals?

there is a big issue where everyone seams to think tighter is better, and yes in some applications it is, well most really, but we are not holding two frame pieces together, we are only torquing to a value to hold electrical components snug which in most cases is a lower value than what we are using.
winston uses a 14mm x 1.25 thread pitch not 6 or 8 mm.
 
18650's fall from grace is complete as far as I'm concerned.

I feel duped, I would cheerlead for them as they were giving out test reports and had excellent prices.
Then they stopped sending reports despite claiming they would on their site.
They constantly do BS on the shipping prices.
They falsely claim there grade B cells would test to rated capacity (but hey at least they admitted they were grade B)
Now instead of acknowledging this terminal problem they are deleting reviews and sweeping this issue under the rug. Chinese Tactics 101.

Unacceptable! Back to Luyuan!

@Will Prowse Battery terminal stress test video?

Some talking points:
- Does adding a bus bar across double bolt terminals with bolts in all 4 holes help stability/strength when tightening? How much?
- Post vs. double bolt terminals, torque ratings from mfg, destructive testing on a few samples
- Measure torque required to twist off a double bolt terminal
- Comments from mfg/resellers?
 
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