$2948 for (32) (280aH)(New) LiFePO4

ArthurEld

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Palm Harbor, Florida

100kwh-hunter

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Direct from them? your link that is?
That is for one cell or 3 or four?
Not really clear to me.
They do sell also bms'es
And 100ah-120ah, to busy atm sorry.

I want to start, they have good promises, but our tax collector and the shipping, raises also questions.
I will sit back and have a good look around there store.(next week sorry busy)
 

100kwh-hunter

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1450 euro for 48v 310ah....with no tax?!?!?!? to the EU....to cheap to be true
Yes i will send them a email.
Thank you Arthur.
 

MattR

New Member
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Nov 26, 2020
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7
Do you think that was just from torque, or from tilt peeling it at one edge?

If you use an extension to the socket and balance it with your other hand, that should eliminate prying force. It also eliminates radial loading on the threads for less friction, higher clamping force for a given torque.




I could imagine it is possible for laser weld to be quite shallow.
QA (pull, torque, or pry test) should keep bad welds from being shipped.
Samples tested to higher force, possibly destructive, should be done for process control.
It's hard to say for sure why the studs broke free. I tested them by using just a bolt and a torque wrench i.e. not connected to a bus bar. The local laser welding vendor has been pretty slow so far, and the Chinese vendor has been asking regularly for updates, which is nice.

The Alibaba vendor sent me a video demonstrating their new QA process which looks like they take an impact wrench to every battery they ship.
 

Hedges

I See Electromagnetic Fields!
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Mar 28, 2020
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10,678
Impact wrench!
That's like the local tire shop where a manager comes by and checks each lug clicks the torque wrench and isn't too loose.
After the gorilla doing the work spun the nuts down with an impact wrench before torquing them.
And of course, for the first lug he put back on, wrench was set to the wrong rotation and spun off. So he spun it back on, starting the threads with the torque wrench and hammering it all the way in :ROFLMAO:
I couldn't remove it without breaking the stud. Fortunately, studs have a flat on the head and Sable has a flat on the hub, so it can be replaced without removing axle like for my Civic.

Try using an extension with the torque wrench like I suggest. At least more of the torque will go to clamping force.
 

Yurtdweller

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USA
Thanks for these two replies and resources. I do plan to make a thread, just don't want to make one that is not sufficiently informed. I appreciate your expedient and considerate replies/suggestions. Thanks for setting more realistic shipping expectations fort lower prices from CH.

@ HRTKD - Once I pull the trigger on the qty of cells and know the post type, I can start right away getting or making the cable lugs, so I think I would have sufficient time to get them in hand. I saw the post with the flexible cable lug made from braided material like grounding strap, I like that idea. Does the Flat Panel Society have membership dues? I'll soon be poor again :D

Thanks in advance for future replies and assistance.
I, too, travel. Usually only in one place for 60 days, and often don't know where to next. Coupled with my bank account occasionally going from 60 to zero in nothing flat, I have had a hard time. Been dying to order 8 280 cells for a while, but while I was waiting, the price shot up:/ I am very close to pulling the trigger right now, and trying to decide between ordering myself or doing a group buy from Michael Caro. I feel ya. Vagabonds and uncertain shipping time is trying to hit a moving target.
 

Just John

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Aug 15, 2020
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No, these vendors are getting the cells that are new old stock as I mentioned.



The only company that we (as in, members of this forum) are pretty highly confident of that sells brand new EVE cells is Shenzhen Luyuan.
I just started a test cycle on the 8 x 105AH Eve cells grade A cells from Amy.
Everything is much improved over the bulk or commodity 280AH cells I have.
Besides the plastic caps, it is obvious a professional drilled and tapped the 4mm threads. Nice and shiny too. I am using my 40 amp tester the EBC-A40L, not 0.5C, but 0.4C.

Screenshot 2021-07-04 005518.jpg
 
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Bud Martin

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Can you please explain the 'Parameter Setting' of step #1? What does 'Cutoff' value of 5.00 mean? I am thinking about getting of of this tester and trying to understand the settings. Thanks!
 

Just John

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Can you please explain the 'Parameter Setting' of step #1? What does 'Cutoff' value of 5.00 mean? I am thinking about getting of of this tester and trying to understand the settings. Thanks!

It says charge with 40 amps, constant voltage. Voltage is 3.65v, and stop when current drops to 5 amps.

Anything else you want to know, just ask.

Screenshot 2021-07-04 073557.jpg
 

Bud Martin

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Thanks!
Do you have the link to the seller you bought it from? There are many sellers on Aliexpress for this unit but I am not sure which one to trust, thanks.
 

Just John

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Thanks!
Do you have the link to the seller you bought it from? There are many sellers on Aliexpress for this unit but I am not sure which one to trust, thanks.
We don't know who you are asking about a link to which product.
If you are speaking about the grade A cells, it's here:


If you are asking about the cheap price for 32 commodity cells, it's on the first page of this thread:


If you are asking about the capacity tester, check out this thread:

 

NMNeil

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Mar 14, 2020
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Prices are going back up ... we are seeing this across the board with testers and batteries and anything related .... with the US in double digit inflation --the world reacts quickly
I just bought a load of 2x4x8' lumber for a project. $3.98 a piece from Home Depot.
It seems the laws of supply and demand are still working, and if people refuse to pay $9 for a single 2x4, they will lower the price. Perhaps the same will apply to batteries soon.
 

rhino

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Jun 6, 2020
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Minnesota
I just bought a load of 2x4x8' lumber for a project. $3.98 a piece from Home Depot.
It seems the laws of supply and demand are still working, and if people refuse to pay $9 for a single 2x4, they will lower the price. Perhaps the same will apply to batteries soon.
I've been tracking plywood prices in USA at Home Depot and it was $66 for 3/4" RTD plywood 3 months ago which was the peek, has now dropped to $33 as of today. Was $19 in late 2019.
 

offgriddave

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Feb 14, 2020
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I've been tracking plywood prices in USA at Home Depot and it was $66 for 3/4" RTD plywood 3 months ago which was the peek, has now dropped to $33 as of today. Was $19 in late 2019.

Last year OSB 7/16 went all the way up to $65. One day last October it dropped to $12 and I bought 700 of them. Its now back to $33.
2x4 are $7 here.. they use to be $2.50
in Southern Oregon using Home Depot prices

Glad I bought a portable saw mill with my stimulus money:)
 
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