Most impressive build I've seen yet, very polished high quality over all the plywood bird houses I've seen.
wow. ... that zip file (attachment) was a waste of my time (for me) .... maybe a *.jpg version might be better next time.You are making me blush!.. thanks
So far the setup has been working perfectly.... if you have the time its a good option but involves a couple of days of work. Ive seen some easier to make setups in this forum, and some guy was even talking about selling them.. Maybe someone else can link it, i remember it was a metallic end platter where you can put your threaded rods.
Anyways, about your questions, the total size its 69 x 22 x 28cm (LxWxH)... and the aluminum spacers are 1/16 (Around 1.5mm).
You can find attached the Blender file, my plan was to improve the setup a little bit (Making it easier to build) and upload this to the forum with nicer diagrams / plans, but i haven't had the time.
The .blend has all the dimensions, if you havent used blender before you can learn the basics in 30m if the model its helfpull.
Greetings!
yea i could not get it to open either... waste of time agreed.
I bet those battery packs are noticably more expensive than the ones we are buying, plus for electric vehicles. The biggest issue I have with this compression idea is having solid bus bars that get clamped in place on the 280Ah cells I have that have slightly wavy or slightly puffed out sides (not perfectly flat planes that were that way I received them); ... that may or might not change when running larger amps in and out of em (mine might only up to 0.5C). What kind of stress might that put on battery terminals? or what what might be easy flex bus bar option? ... I will figure out what I am doing w this compression idea when I build my stack battery rack and integrate 2nd 24v x 280Ah set for 560Ah for a sitting very still solar application.
Good find. I'd like a closer look at one of those packs, I'm assuming the yellow stuff is some kind of foam as mentioned in this thread:
diysolarforum.com
yes, the stress on the small 6mm studs is a major concern - I agree. I also was looking at the idea of more flexible cell interconnects. the breaded ones seem to be a possibility. I also was looking at trying to crimp cables and lugs for interconnects between the cells. the compression jig is still a good idea with some sort of slick insulating dividers.Good find. I'd like a closer look at one of those packs, I'm assuming the yellow stuff is some kind of foam as mentioned in this thread:
In relation to eve lf280:Another Cell Compression Thread, this time about foam
Hi everyone, been lurking in the shadows and finally decided to put up my first thread and post. I've read thru many of compression threads and can say there is much discussion about this subject. My background is automotive, I'll just leave it at that. This is how the EV manufacturers are...
The pressure on the terminals was the first thing I noticed when I test setup my pack, and heard movement when I removed the busbars from a fully charged pack.
I also noticed that a fully charged pack that i'd tightly clamped with 10mm Alu plates and m6 rod, was loose on discharge. Must clamp at the sweet spot of charge/expansion.
As far as the terminals go, from a dismantling video of a 100ah cell I saw, it looks like the connection from terminal to cells is flexible, but I still would be concerned about work hardening and possibly fracture and leaking of the case after multiple cycles.
So all of this brings me to the conclusion that I will be installing 3mm foam between all cells, the Saint Gobain Norseal looks hard to find and expensive, so will be using Zotefoam. I will use springs to get the right clamping force, then remove them one by one.
Also will probably ditch busbars for tube lugs and braided cable. When I assembled my first pack, I noticed the planes of each terminal were not parallel, with only low torque forces on the terminals allowed, there is no way a bus bar would bend to the terminal face, or pull the terminal to the busbar.(I'd love to find out that the terminals are designed to accommodate movement) My observations from trying to hone terminal pairs parallel showed me that without this modification, busbars are only likely to get about 30 to 40% contact area to terminal face, depending on deviations of the terminal plane. But in my case it was pretty consistent.
So, there's my tuppence worth. ?
Hello Andy
What formula are you using for tension -> torque?, want to check my 3/8 rods, maybe i over thighten
Found a calculator on line somewhere and then sanity checked it against some tables. Garlock has a good one.
