June 10, 20233 yr Here's my simplified STL for the clips, allows it to be printed upright with minimal support. SVoltBatteryClip.stl
June 10, 20233 yr These cells need very little top balancing - they are all within 1% is capacity and initial charge . I would just charge them all in series with your BMS and let the BMS top balance it if you have a BMS with decent balancing current
June 11, 20233 yr On 2023/06/09 at 8:17 AM, NoordSolar said: Has anyone had busbars made using laser cutting copper? Copper is one of the more challenging materials to laser cut, for the same reason that it is used for the mirrors in CO2 lasers. So it might be difficult to find a supplier that can do it. Water jet cutting will work, but at a much higher cost.
June 11, 20233 yr I would get some copper flatbar. Cut to length and drill. Then have them nickel plated.
June 11, 20233 yr 2 hours ago, Chris_S said: I would get some copper flatbar. Cut to length and drill. Then have them nickel plated. I think I have found a crowd in Pinetown that will do it
June 11, 20233 yr Author On 2023/06/10 at 9:23 AM, Brushless said: Bought some of these cells new yesterday from Telenetix in Centurion (0861887847) for R1140 each (incl. VAT). Pity the busbars and clips aren't available here yet but I'm having some busbars CNC cut from aluminium. Will try 3D print some clips after modifying the STP file (*thanks NoordSolar for the link). Top balancing large capacity cells like these is going to be a challenge though as my biggest charger only does 15A. Anyone in JHB have a high amp LFP charger? Can't see that on their website, do you have a link? Or do I have to phone them? Do you know how many they have in stock?
June 12, 20233 yr Just phone them, speak to Andre. When I was there on Friday they still had a container full left.
June 12, 20233 yr Author 32 of these cells coming my way 😍. We'll need to share tips and tricks on how to put them together. Unfortunately my build will have to wait till end of the year... ish
June 19, 20233 yr 9 hours ago, Froggy said: https://flic.kr/p/2oJ2Qz2 Looking good Mr Froggy, what BMS is that and how do you plan to connect all the batteries? I am also keen to see how you finish it off as I am seriously considering building such a battery for myself (and later maybe another 1 or 2).
June 19, 20233 yr On 2023/06/08 at 9:05 AM, NoordSolar said: HAve you come across a decently priced DC breaker with a 10 -20 KA+ fault current rating ? I used these.
June 19, 20233 yr 7 hours ago, PsyCLown said: Looking good Mr Froggy, what BMS is that and how do you plan to connect all the batteries? I am also keen to see how you finish it off as I am seriously considering building such a battery for myself (and later maybe another 1 or 2). Thanks PsyCLown! It's a JK BMS. I'm busy making the busbars with good old 22mm copper water pipe. Some might scoff at the idea,but it served me well so far. One just needs to ensure they are 100 % flat. I just have to decide if I'm going to nicke plate. I'll be using stainless washers, spring washers and nut torqued to 8nm.
June 20, 20233 yr 1 hour ago, NoordSolar said: Is the pipe simply squashed , so its two layers ? To me it looks as if it was cut (so a single layer) then flattened so it is no longer circular. Can someone who purchased from Telenetix confirm that the threaded studs are already installed on the cells. Edited June 20, 20233 yr by PsyCLown
June 20, 20233 yr 31 minutes ago, PsyCLown said: To me it looks as if it was cut (so a single layer) then flattened so it is no longer circular. Can someone who purchased from Telenetix confirm that the threaded studs are already installed on the cells. Yes those are welded studs
June 29, 20232 yr Just got 16 of these too! As mentioned previously, all pretty much perfectly balanced (within 1-2mv) Just waiting on the clips + bus bars too now.
July 1, 20232 yr Author On 2023/06/29 at 12:16 PM, reapster said: Just got 16 of these too! As mentioned previously, all pretty much perfectly balanced (within 1-2mv) Just waiting on the clips + bus bars too now. Where are you getting clips and Busbar from?
July 2, 20232 yr Personally I would want to compress just a tiny bit so clips don't seem like a good idea for that.
July 2, 20232 yr On 2023/07/01 at 7:31 PM, gimme_power said: Where are you getting clips and Busbar from? Altergrid mentioned they expecting them around mid-August
July 4, 20232 yr Author Reminder to anyone who has two of these cells spare (like me) that I will be interested. I have two spare as I am building two 15 cell packs but had to buy 16 cells. I can make a 12V battery if I can lay my hands on another two cells Thanks
July 4, 20232 yr 4 hours ago, gimme_power said: Reminder to anyone who has two of these cells spare (like me) that I will be interested. I have two spare as I am building two 15 cell packs but had to buy 16 cells. I can make a 12V battery if I can lay my hands on another two cells Thanks Or you can use all 16 of them.
July 4, 20232 yr Author 31 minutes ago, Tim003 said: Or you can use all 16 of them. Or that... Except I need to match it with other 15cell packs as they will be in parallel. Or do you have a solution for that? Like a big DC to DC converter, bi-directional😀 Edited July 4, 20232 yr by gimme_power
July 4, 20232 yr 57 minutes ago, gimme_power said: Or that... Except I need to match it with other 15cell packs as they will be in parallel. Or do you have a solution for that? Like a big DC to DC converter, bi-directional😀 Why in parallel?
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