That would be too much work. I plan on using the existing 10 cell holders and just snip the negatives within a pack, turn them around parallel with the others and make 20 4.2v ~13.5ah blocks in series. Easy peasy. I may go 18s too as I have a 75.6v charger. We'll see what fits in my triangle.999zip999 wrote:You can make 10p3s blocks for 12v and make a long string 6 blocks = 74v and have an extra 12v block for replacemant. Yes replacement. Or 21s for 86v. These are used cells.
Think I'm going to tweak one of my chargers to around 4.16-4.18v as that's what all the V cells want to settle at anyway. 4.1v isn't enough to trigger the "self balancing" I don't think. On VTs sure. Think I need to up my tab welder to 18-20v from the current 16v also as I'm not super happy with the penetration I'm getting. Might experiment with making my copper rod contacts more fine point also.999zip999 wrote:Charge blocks to 4.1v
I'm always amazed at the packs that are completely rusted... like did they leave them in the ocean or something? And the packs that have tons of crap in them like black soot or sawdust. It's amazing what gets in there.Teh Stork wrote:Bottom line, if you have enough cells - you'll encounter a few weird ones.
I'll upload once I've finished it all up Middle of exams here too, not enough time!pwbset wrote:
I'm always amazed at the packs that are completely rusted... like did they leave them in the ocean or something? And the packs that have tons of crap in them like black soot or sawdust. It's amazing what gets in there.
Got any photos of your pack? My 18s10p triangle pack should be done by tonight after about 20hrs of labor. Hope I don't have any bad welds or anything anywhere.. was pretty thorough, but ya never know until you throw a few thousand watts through it.
I used to use hot glue between cells and found that the hot glue can easily just tear the green covering off the cell if mishandled/bumped, hits the cell with unnecessary heat and adds an appreciable amount of weight to the pack. For my lastest build I just kept the existing cell spacers and tab welds for simplicity.Punx0r wrote:If you want to prevent movement between cells, would a string of hot glue not be a quick and easy solution when assembling the pack?
Yeah I dremel off the excess pos side stuff... the above photo that hasn't been done yet. Helps prevent shorts for sure.999zip999 wrote:pwbset I cut the overhang on the pos. end so it wouldn't touch the neg. case of the cell.
You're not hitting them hard enough yet to "self balance". If you have the ability charge your pack to 4.2v/cell and cycle it like that a few times. I bet you notice that the cells come into balance with each other better on their own and rest down to around 4.15-4.16v/cell. That's just what these cells do on their own, which is why people don't bother with balancing them. I only ever monitor pack HVC/LVC and have never had a problem in 100s and 100s of cycles over the years.999zip999 wrote:I hooked the sense wires as 6s or 24v. and hooked a hyperion EOS pack sentry and bulked charged on a kingpan to 74.4v. But was having a lot of balance troubles difference cells random. So left it on the charger with sentries. I found that 5 and 6 cells where at 4.135v and the rest at 4.099v - 4.111v ? So balance with bulb without sentries and will see how they keep balance.
I guess my point was that if you take the pack to 4.2v it will "balance" itself. You're doing a lot of manual balancing work that's been proven over and over to not need to be done (with good cells anyway... runts are a different story). Just trying to save you some time that's all.999zip999 wrote:Thanks once I like it's balance at 74.4v I will turn it up and balance 4.2v to see if they like it.