It is not visible on the picture, but the stud has a little weld to the bolt. They won't come off.
This is a stationary battery, and the studs are 10 mm away from the cells, so i have no fear for damage to the cells
Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review
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It is not visible on the picture, but the stud has a little weld to the bolt. They won't come off.
This is a stationary battery, and the studs are 10 mm away from the cells, so i have no fear for damage to the cells
Stud to nut that is
chicagoted
New Member
No worries, let's do it.
Let's assume you're using M6 threaded rod, typical low carbon steel and zinc coated stuff you'd get at the DIY center.
M6x1.00 is the normal coarse thread form, you will use 4 rods of this with matching nuts.
We will assume lubricated threads because even normal handling transfers moisture and oils to the threads.
The good enough ciphering to be used here is T = KDP
Torque (N-mm)
K is the friction constant, in this case 0.15 for lubricated threads (0.2 for dry and clean threads)
D is the bolt diameter in mm
P is the clamp force in N
T = (0.15) * (6 mm) * (2942 N)
T = 2647.8 N-mm or 2.647 N-m
Not much! Basically get 'em all finger tight, another scootch and you're done.
HEADS UP!
2 sellers, wich one of them is xuba, notitied me today EVE will stop selling these cells to agents. So it means when the stock is empty, it is done with buying eve cells at this price. That being said, they are looking for alternatives.
2 sellers, wich one of them is xuba, notitied me today EVE will stop selling these cells to agents. So it means when the stock is empty, it is done with buying eve cells at this price. That being said, they are looking for alternatives.
Very interesting news. I wonder what the reason is.
They already do, and their prices are roughly 2-4x the price of the grey market sellers (at least list price is), but cells sold through official channels have some substantial benefits for the increased price (trusted seller, matched cells, support, verified condition/grade, possibly warrantied (true of some manufacturers not sure about EVE).
See Steve's post
Heads Up Alert: Li-Ion & LFP prices going UP this month.
This is a General Heads Up for all considering to buy new Cells & Battery Assemblies. September 11, 2020. I received word this afternoon from some suppliers that Battery Cell prices are going up by the manufacturers. They are citing the increasing demand for supplies & materials. Apparently...
diysolarforum.com
There are alternatives, but if you want a spare EVE 280Ah cell in case of bloating/damage later, you might not be able to get an EVE 280Ah replacement cell. I'm going to order some spares just in case.
. Great info in this thread.
Ampster
Renewable Energy Hobbyist
That is very important. The aluminum case under that thin shrink wrap film is connected to the positive pole. Not a problem if all your cells are in parallel.
The New JC777
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Depending on your inverter and controllers, you may be able to change all of the charge/discharge parameters to allow for the loss of 1 cell at 48 volts thereby loosing only 1/16 capacity. If you loose a cell at 8S2P you loose 50% capacity, but you have plenty of backup cells.
I'm betting that grey market cells eventually show up as black market cells.
The New JC777
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In this scenario, I would consider 15s it a "quick fix" giving you ample time to find a black market cell. If you cant find a cell it will operate at reduced capacity until (if) another cell gives up the ghost.
The New JC777
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You are right. I misread your post. My bad. 2P8S 24v works similar to 15S 48v in the case of a failed cell. From my lead acid days, with older batteries loosing a cell meant that others weren't far behind. But that may be different with LFP.
The New JC777
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I think I just talked myself into 24 volt.
I'm building a system to power my home in the Philippines where parts are hard to get and slow to arrive so everything needs backups. I can parallel 2 24v mpp units so if one fails I can always quickly reconfigure to run on just one. I'll have back bms and connectors all on hand too. I keep looking to 48v because one 48v invertor is cheaper then 2 24s but Im thinking the 24s is the way to go
Maybe I'll get ahold of any to get 8 more maybe. I felt bad not buying my 16 from her, she just couldn't match the price. But for 8 the difference is mess of an impact. She really is a greater help then any of the other sellers I've spoken to
Maybe I'll get ahold of any to get 8 more maybe. I felt bad not buying my 16 from her, she just couldn't match the price. But for 8 the difference is mess of an impact. She really is a greater help then any of the other sellers I've spoken to
The New JC777
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Go with what is best for you. There is no wrong answer as it pertains to redundancy, just options. Sometimes too may options.
Well I finally placed an order for 16 cells, total price including shipping by sea to Mesa, AZ:
Product price + freight = $330.68*4+$348=$1670.72 DDP
I was surprised my credit card went through with no hassle, just entered the information and it was done.
Previously they (my credit union) had blocked an $8k charge to Allied Van Lines about 3 years ago, I guess the call asking what use is a card you can't use was effective!
Product price + freight = $330.68*4+$348=$1670.72 DDP
I was surprised my credit card went through with no hassle, just entered the information and it was done.
Previously they (my credit union) had blocked an $8k charge to Allied Van Lines about 3 years ago, I guess the call asking what use is a card you can't use was effective!
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