ghostwriter66
"Here - Hold my Beer"
Mine bulged out in the middle a tiny bit.
You know you have been out in the South Texas oil fields to long when you laugh at this - for all the wrong reasons ...
Mine bulged out in the middle a tiny bit.
It's in the latest eve lf280N data sheet. Bottom of section 6OK - i had to delete my first response(s)(s) -- deep breath -- WHAT ARE YOU BASING THIS ON???
I am basing it on the EVE spec sheet. There are may discussions about how to do this in the forum. I asked EVE and they basically told me to mount the cells in a fixture to keep them from expanding. It helps to keep the pouch within the aluminum case from delaminating.OK - i had to delete my first response(s)(s) -- deep breath -- WHAT ARE YOU BASING THIS ON???
It's in the latest eve lf280N data sheet. Bottom of section 6
From what I am gathering yes....around that voltage.So you are saying after 48hrs resting they are all at 3.58? Is that what they should be?
I've interpreted that as an enclosure that can withstand 300kgf. But then I suspect at that force the sides would pop? Anyway, mine are going between two end plates of 10mm aluminium plate and 8 no. 6mm stainless threaded rods to hold them together. ??Not arguing the compression theroy -- arguing that you can go from 2500 to 3500 cycles if you put the battery under 300kgf of force. I am going to call them Sunday night (my time) and see how they came up with that cycle number and kgf ...
How did they get that 2500 to 3500 number is my question ...
300kgf - if i am doing my math right .. equals ~662 POUNDS of force.... that's pretty snug
From what I am gathering yes....around that voltage
I will be interested what they tell you vs. what they told me. Please let us know.Not arguing the compression theroy -- arguing that you can go from 2500 to 3500 cycles if you put the battery under 300kgf of force. I am going to call them Sunday night (my time) and see how they came up with that cycle number and kgf ...
How did they get that 2500 to 3500 number is my question ...
300kgf - if i am doing my math right .. equals ~662 POUNDS of force.... that's pretty snug .. can you even compress plywood that much??
I've interpreted that as an enclosure that can withstand 300kgf. But then I suspect at that force the sides would pop? Anyway, mine are going between two end plates of 10mm aluminium plate and 8 no. 6mm stainless threaded rods to hold them together. ??
I think their figures are dubious, the cells would split at that force. I will be snugging the nuts until they are just tight, I'm a recovering over torquer'. I will happily cherry pick their info and just go with keeping them compressed makes them last longer. Will be interested what they say to you though. It's often a long chain between who you speak to and who knows wtf the specs mean.From the datasheet "The battery cell is under the action of preset 300kgf force" ... that means that there is a 300kpf force pressing on the battery - squeezing it ... They are recommending 662 lbs ... my torque wrench here at work only goes to 600 and honestly - its as tall as i am and i have to get one of the bigger guys to do anything over 150 so I can only imagine 662... Our DIESEL GENERATOR bolts goes in at 600 ...
Another question for them is what are the breakaway numbers?? .. meaning .. if we get 3500 cycles at 300kpf, then what increase would we get at 200 or 100kpf, if anything.
The torque on the bolts will be a lot less than the force exerted via the threaded rod and plywood .... There was another post about this where they actually determined the bolt torque need. I think it varies depending on size of threaded rod and thread count also.From the datasheet "The battery cell is under the action of preset 300kgf force" ... that means that there is a 300kpf force pressing on the battery - squeezing it ... They are recommending 662 lbs ... my torque wrench here at work only goes to 600 and honestly - its as tall as i am and i have to get one of the bigger guys to do anything over 150 so I can only imagine 662... Our DIESEL GENERATOR bolts goes in at 600 ...
Another question for them is what are the breakaway numbers?? .. meaning .. if we get 3500 cycles at 300kpf, then what increase would we get at 200 or 100kpf, if anything.
LOL ok.You know you have been out in the South Texas oil fields to long when you laugh at this - for all the wrong reasons ...
You know you have been out in the South Texas oil fields to long when you laugh at this - for all the wrong reasons ...
Out there corrupting the innocent minds of all those poor gentle oil field workers, are yaYou know you have been out in the South Texas oil fields to long when you laugh at this - for all the wrong reasons ...
Who is the them in this case? EVE proper?I am going to call them Sunday night (my time) and see how they came up with that cycle number and kgf ...
This was my reaction at first also, but once you spread it over the surface area of the broad side of a cell, it didn't seem so excessive, I don't recall what the value was, someone else might. But as Gazoo and others have previously noted, I think the main purpose is keeping the cells from expanding/bulging/deforming.300kgf - if i am doing my math right .. equals ~662 POUNDS of force.... that's pretty snug ...