Just Place new Order on Alibaba- 280AH x 8 for 1260.00 USD Delivered, Grade A to Canada
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Sgt Raven
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0.001V I'd say they're pretty well matched. Are you going to top balance them in parallel to 3.65V, before building your battery/ies?
Sgt Raven: those are M6 - 25mm brass bolts. (off of ebay). I got them a wee bit longer as I wanted the double nuts on there to make sure it is nice and tight. (I don't remember but this approach was a good recommendation from someone else on this site. It might have been Steve_S). you'll also notice that the top nut is a nylon thread locking nut. I thought these were all good approaches because the threaded hole on each of the cells is very very shallow. (only 10mm ) I don't want these vibrating loose while in the 5th wheel. I also made sure the top of the battery case comes off quickly without any wire removal issues so I can do a quick inspection.
Sgt Raven
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Thanks for getting back to us on this. That is a prefect picture of what you did.
I was thinking of using stainless bolts, with a brass washer under the nuts.
FYI, a #14 brass machine screw washer is listed having a 0.24 hole and should work with a M6 bolt.
That is the specs I've seen and they carry #14 brass washers at Home Depot.
M6 is listed as 0.2362 in. diameter.
ETA: I saved your pic to my computer, so I don't have to hunt it down in the future.
Sgt Raven
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Yes, M6 Grub/set screws would be perfect, if you can find them in a reasonable time frame. Or use bolts like this, till the studs arrive. Another poster here suggested screwing them in till they lightly bottom out and backing them off 1.5 turns. Then hold the bolt/stud while tightening the nuts. That way you not putting to much pressure on the bottom of the terminal.
tim0shel
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I have been thinking about this as well for a 3D printed top but also bottom that the batteries could sit in. Just make strapping them easier. Unfortunately I just dont have the time to design this and or fix my 3D printer. But could maybe print from one at work.
tim0shel
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Oh look how pretty!! So is that for 8 cells? I need to go this route as I will be putting mine in a Pelican 1440 case but like to have a good top and bottom and clamped for the 4 cells.
No this is a knockoff of the fortune cell. If I did this I was going to make a bottom for each cell to glue into. Similar for the top too. Then there is a knockout in them to allow threaded rods to hold them all together. This was just a prototype to see if I could make one in my new printer.
offgriddle
"FOREVER BEGINNING"
What kind of BMS and SCC will you use?
Carly
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I'm leaning toward bottom balancing to start with (single 8s). Still have a month or so until I receive my capacity tester and power supply. I'm learning as I go, and I'm going very slowly!
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
My batch is supposed to arrive today so I better get my driveway snow blowed (Ol Ma Nature dumped 5" if wet'n heavy ick on me last night). I have yet to receive my 180W Load Tester or 3-14V 50A Charger units - well apparently the Charger is at my post office waiting on me. I decided I want to test each cell independently before I put together packs. I'll be posting my finding in my Xuba thread. I was hoping that I had my orders placed / timed so they would come in close together... BMS' and a lot of the needed stuff has arrived though but not in the right order darn it.
tim0shel
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Mine came yesterday and sent message to Amy this morning that the packaging was perfect and the inner box really protected them because the external one was torn some. Then the each individual cells wrapped adds to the protection. Each tested perfect and all looks great!! I cant wait to start putting things together but still need to decided on charger etc. I'm still waiting on my BMS too. I have a Pelican 1440 case coming that these will go into.
Just out of curiosity, how soon after dispatch have you been able to track your orders in your country (or continent) . My order is coming to US with Fedex, left on 2/26 by air and Fedex still doesn't show any tracking data. Just shows "tracking number can not be found..."
Is it financially worth 3D printing cases for these packs? I suppose you use a lot of filament that is not exactly cheap. Unless you just like to play with it and cost is not an object. I'm thinking making my case out of either solid wood or plywood, we'll see.
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Once it arrives on the US Coast and get's logged, the tracking begins.
My label was created on the 20th of Feb, tracking commenced n the 27th when things hit Richmond BC (I'm in Canada EH ! ) BUT there was also the delay as no air flights out were allowed at that time, so it added a couple of days till that was sorted by the air freight companies.
I decided to build my battery cases out of 3/4" Ply with a clear Perspex (polycarbonate) top. I do cabinetry work and such, so not a big deal.
Based on your dates I should see the tracking status moving any day now, hopefully soon.
For case, I'm thinking some type of wood, maybe combined with aluminum angles for corner/edges reinforcement, I'll see what I find laying around, I think there is some kind of plexi glass in the garage as well. I used to do cabinetry as a profession for many years as well, now I make drawings and programming CNC machines for the same industry, so that part is not a problem.
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
YOU CHEATER !
I have to use the table saw, circ saw, hand saws & chisels & router etc... only "jig" trick I use is I fell in love with KREG tools years ago and their pocket screw system is 'da bomb' IMO... BTW, I built my home, did all the wood trims, casings and everything myself... no synthetics in the house either, all of it is wood, not one spec of particle, mdf, or other crud here.... even built my cupboards & cabinets out of rough mill cut 1" red pine. Home is quite rustic and suited for being in a mixed coniferous forest. (my "avatar" is on the peak of the house) Live edge white cedar exterior, all hand processed.
Haaah, yeah I wish I was this cheater and had access to all the machines, but I don't, I work remotely from home so I rely on the hand tools in my garage. And I don't even have a table saw, so who's the cheater now ?
But I'm pretty handy with what I have , so a battery box is a piece of cake. Nice work on the house btw, sounds like a great place. Kreg makes some nice pocket screw tools, I've never used them though, when I worked on the bench back a decade or two, we used industrial drills for pocket screw joints, made specifically for that one operation, all adjustable.
No I wouldn't print a whole case even if I could, this was just a piece to add to the individual cells.
bostonbuzz
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I’d love to see some nice shots of people securing these cells.
I have 4 coming to be my only batteries in my sailboat (and start my diesel) with a chargery.
I have a nice pelican waterproof box I will have the BMS batteries and relays inside of, but I’m not sure how to secure the batteries themselves.
Plan is to use g-10 board and stainless giant hose clamps to hold cells together. But how to secure them to the box is a mystery. I have some hard foam that may work since the fit will be tight in two dimensions, but I want the box to be able to go upside down and obviously lean 45 degrees with no possible problems whatsoever.
Any ideas?
I have 4 coming to be my only batteries in my sailboat (and start my diesel) with a chargery.
I have a nice pelican waterproof box I will have the BMS batteries and relays inside of, but I’m not sure how to secure the batteries themselves.
Plan is to use g-10 board and stainless giant hose clamps to hold cells together. But how to secure them to the box is a mystery. I have some hard foam that may work since the fit will be tight in two dimensions, but I want the box to be able to go upside down and obviously lean 45 degrees with no possible problems whatsoever.
Any ideas?
I think I can only laugh about this now because the rage inside me is too much.
Yesterday I got notification from UPS that my package was set to be delivered [today]. I thought I would avoid the possibility of porch theft and chose their option to pick it up at their depot. I get a notification this morning that the package has been delivered AND picked up. But get this. Not at my house, not at their depot. At another address. UPS apparently "regrets" this and has opened an investigation and will get back to me in 1-8 days. What kind of an outfit is this!?!
Yesterday I got notification from UPS that my package was set to be delivered [today]. I thought I would avoid the possibility of porch theft and chose their option to pick it up at their depot. I get a notification this morning that the package has been delivered AND picked up. But get this. Not at my house, not at their depot. At another address. UPS apparently "regrets" this and has opened an investigation and will get back to me in 1-8 days. What kind of an outfit is this!?!
That sucks, similar thing happened to me several times with Amazon drivers delivering my packages to other people in the neighborhood, but mostly smaller items and they were replaced quickly. This coming from China, what a mess.... Hope they find out what happened and package gets back to your hands.
John Frum
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Sorry to hear your troubles
UPS is currently the penultimate courier on my stack ranked list.
I will pay a premium to avoid using them.
If anyone is interested, Sprintstar is dead last.
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