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  1. tsourorf

    Common pack design mistakes, how to avoid?

    If it's the same for all the cells, it wouldn't make any difference regarding the current contribution of each cell to the pack. To make what I mean obvious, if in a 5P pack, each of the cells contribute the following to the total current: 100%, 95%, 87%, 75%, 60% (Of their maximum contribution...
  2. tsourorf

    Common pack design mistakes, how to avoid?

    Oh, that was for that pack? I hate to say but you've missed a few things there. First of all, the 20mOhm IR is rather optimistic but I wouldn't care about it as it doesn't affect the differences between cell current contributions anyway. The most important thing is that you haven't put any...
  3. tsourorf

    Common pack design mistakes, how to avoid?

    This is nice Buk! Basically, you are using copper to minimize resistance and trying to keep equal distances from root to each parallel cell. I say it's perfect enough for pragmatic applications. After the last complicated 16p pack I've made, I though I should try a much easier and possibly...
  4. tsourorf

    Common pack design mistakes, how to avoid?

    As pointed out in a previous post, connecting the input/output on the first of all these parallel cells is a big mistake. The first 7 cells of the pack will take most and give most of the power, with each one of the rest of the 10 parallel rows contributing less and less as we move farther from...
  5. tsourorf

    Common pack design mistakes, how to avoid?

    So, I have finished my first 16P pack. It went better than I thought. I only used spot welding @40A for nickel strips and @60A for the split copper strips. I only need to solder a wire for the positive and a wire for the negative pole of the pack to finish it. And... do it 12 more times of...
  6. tsourorf

    Common pack design mistakes, how to avoid?

    So, the configuration I am going forward with is the 13S16P with the cells connected as shown in the following images: The connections between cells next to each other will be done with spot welding 7mm wide 0.15mm thick pure nickel strip. Thus, all cells will be connected with the nickel...
  7. tsourorf

    Common pack design mistakes, how to avoid?

    Hello and sorry I haven't replied for a few days. Really busy at work! :) I have created a demo for the various connections seen on the SmartGauge page: This shows two things: 1) The SmartGauge website is right and the first two types of connection are just a pain for the cells. 2) I have...
  8. tsourorf

    Common pack design mistakes, how to avoid?

    Thanks for the replies! Fechter, I have to put the batteries in parallel first because I want to place them in the bicycle triangle. The main problem with that is that I would need more than one BMSs (In fact, up to 15 BMSs). Connecting them in parallel first, I only need one BMS to capture and...
  9. tsourorf

    Common pack design mistakes, how to avoid?

    I really like your tool Buk! I'm gonna have some fun with it as soon as I get some free time. :) I don't know if it's actually a big problem or not... however, even you see differences between the cells in just 4P. I know they are very small, but I have 15P to build and some people build...
  10. tsourorf

    Common pack design mistakes, how to avoid?

    As promised, the schemas of my connections: And the final result on my bike will look like that: In the first picture, you can see the connections. The positive of the 15P pack will come out of the cell no5 and the negative out of cell no13. In theory, if the motor wants to draw 30A, the...
  11. tsourorf

    Common pack design mistakes, how to avoid?

    Hello, I've read though all the posts in this thread and I am puzzled while I am in the process of building my second pack. Maybe someone can give me a couple of suggestions. The first pack I've built was for my brother and it was a 48V 13S6P using cheap Chinese 18650s that had on-board...
  12. tsourorf

    DIY battery keeps blowing charger's fuse

    Hello Punx0r, Thank you for all the info. I have to say though, this discussion has gone off topic as people don't give a few seconds' time to read that it has been resolved. Having said that, there has never been a question of the batteries' performance or any quality issues. E-bikes do have...
  13. tsourorf

    DIY battery keeps blowing charger's fuse

    Hello Hillhater, That is your opinion. Mine is that when your opinion is purely judgemental, you should keep it to yourself. I only asked for some help on a specific point, not anyone calling me stupid for my battery choices. Just for the sake of the argument though, I will provide you with the...
  14. tsourorf

    DIY battery keeps blowing charger's fuse

    My apologies to all. I have built the battery for my brother's bike and my brother lives in another country, so, it was a bit difficult to ask him for photos and measurements. After a few instructions on how to use the multimeter, he managed to get readings from the charger. I was really...
  15. tsourorf

    DIY battery keeps blowing charger's fuse

    You can see the charger I've got in this link: http://www.aliexpress.com/item/48V-4A-Charger-Used-For-Lithium-Battery-Charge-Wholesale-and-Retail-Free-Shiping-Hight-Power-Charger/1352337032.html
  16. tsourorf

    DIY battery keeps blowing charger's fuse

    Mate, I just answered those questions! 48V nominal voltage. 13 batteries of type 18650 connected in series. I hope you know 18650 has a nominal voltage of 3.7V, right? What more detailed would you like as a picture? I sent a complete representation of the battery.
  17. tsourorf

    DIY battery keeps blowing charger's fuse

    This is the schematic of the battery I created. 13 pairs of 18650 batteries. Nominal 48V. The connector is a C14 connector (Male). The C13 (charger side) and C14 (battery side) connectors have the letters 'L' and 'N'. Using my multimeter I can verify that the 'L' of both sides is the one that...
  18. tsourorf

    DIY battery keeps blowing charger's fuse

    The first charger I bought didn't have a fuse and got blown altogether. That one, I connected the AC first and the battery afterwards. Once I connected the battery, a tsaf noise came from the charger along with a burnt smell. I disconnected both as fast as possible. Connecting the charger to AC...
  19. tsourorf

    DIY battery keeps blowing charger's fuse

    Hello everyone! I have built a battery for my brother's bike and I have a problem I cannot figure out how to solve. First of all, I have built 3 identical 13S2P (48V) packs using very cheap Chinese re-wrapped 18650 batteries. They are supposed to hold 6Ah each, but I guess they will be more...
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