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  1. tjobapuerh

    Parallell fusing

    Thanks! and sorry for the late reply I had some computer issues here. I actually had a chance to test it accidentally, as I was assembling this into the box I managed to short the battery real quick -- there was a powerful spark, but the fuses didn't blow. I guess the BMS took care of it before...
  2. tjobapuerh

    Parallell fusing

    Hey guys! i’m setting up a battery pack of 29.4v / 30Amph. i couldn’t find locally appropriate fuses, and made this parallell set up with 3 fuses of 20A each. Will this work? cheers!
  3. tjobapuerh

    7S10P Li-ion build ,, insulation?

    Alright! To be clear tho speaking about burning, are you thinking of the risk from outside, or is that a safety measure "from within", let's say -- considering the fact that li-ion batteries potentially can self ignite? I saw Jehu built some batteries, separating inside the box two packs from...
  4. tjobapuerh

    7S10P Li-ion build ,, insulation?

    it's for spacing/holding the cells in place, as well as a little extra padding/protection for handling/bumps. Are there any materials recommended for this use, and types of materials NOT TO use, that I should look out for? I'm afraid that the heat or something like that can be problematic. Thanks!
  5. tjobapuerh

    7S10P Li-ion build ,, insulation?

    Hey guys! I'm putting together this battery here: It's 29.4v 7S10P Li-ion 18650 as you can see from the photos. I have a 100A Daly BMS, a DIY fuse solution of 20A car fuses in parallellx3, and one shunt for an Amp/V meter. I've made the connections I needed to do; Now I need to make a box for...
  6. tjobapuerh

    Breaker fuse @ Amp or Wattage? + Individual cell fuse question

    Hey there! I have just finished soldering together a 7s10p li-ion 18650 battery of pretty new second hand Panasonic NCR18650B cells, and I am about to solder onto it a Daly BMS for 7S100A. In a conversation with a friend about which fuses to add at the output power from the BMS, he told me...
  7. tjobapuerh

    Small pack 3S only 4.15v -- What am I doing wrong?

    (Managed to embed the photos, thanks Korishan!) It seems like a combination of your answers somehow are correct. Altho @Korishan: for the record the plus/minus were wired on each opposite corner, like you say. (Imagine while looking at the photos, I spun the cube 180 degrees towards the...
  8. tjobapuerh

    Small pack 3S only 4.15v -- What am I doing wrong?

    Hey guys! I'm sure the answer is ridiculously simple. But I'm assembling here my first pack as a little experiment, from used laptop batteries, that I have tested and rated for Ah, and assembled accordingly. At the outset they were all around 4.15v, and I've assembled them in 3s3p. I've used...
  9. tjobapuerh

    DIY Charger for 7S/29.4V ?

    Thanks man for your feedback! I will do as you suggest, I've located a local dealer for electrical scooters that sell a 29.4v (7s) charger at 3a. I guess that'll do the job -- because if I understand correctly the BMS should do the balancing during charge. The 6S iMax alternative would mean...
  10. tjobapuerh

    DIY Charger for 7S/29.4V ?

    Hey guys! I am about to assemble a battery I've been planning for a while, that was supposed to be 7S 24V li-ion. The project has been infinitely delayed because of crazy shipping times due to the whole covid situation, obviously. My problem now, is that I don't have a charger that would work...
  11. tjobapuerh

    Maximizing battery capacity question

    Great answers guys! Thank you both!
  12. tjobapuerh

    Maximizing battery capacity question

    Thank you! that's exactly the kind of answer I was looking for. But I was left wondering: If the 12v configuration of li-ions are able to use 60% capacity, what would be the percentage of 24v? (4.2 * 7 = 29.4, i suppose would be considered too high, also?), where is the "high cut-off" for 24v?
  13. tjobapuerh

    Maximizing battery capacity question

    Hey! I'm trying to harvest information on the advantages/disadvantages of different volt systems in battery builds. As I have 100x 18650 li-ion cells of 3000mah each to play with, I'm trying to determine what's the best set up. I've been dwelling over a 12v 4s set up or a 24v 7s set up. I...
  14. tjobapuerh

    Experimental battery pack set-up? Or well tested/functional format?

    damn! it's never that easy as you'd think ey! it's a technical tower of babel anyway thanks for your feedback! appreciate it!
  15. tjobapuerh

    Experimental battery pack set-up? Or well tested/functional format?

    Great! So with a two-pack configuration of 12V/37.5Ah each -- I could swap it around, (given I provide the right connections), into one 24V/37.5Ah battery?
  16. tjobapuerh

    Experimental battery pack set-up? Or well tested/functional format?

    I don't know if it works, but the 99A would in my head be divided an run by 3 different BMSes (so 120A) -- 3S11P (12V/33A per pack). Anyway I am considering to go for 4S. I have 100 cells (@3000mAh) to play with. So I am considering to make then 2x 37.5A (total 75A) -- with each a 40A BMS. But...
  17. tjobapuerh

    Experimental battery pack set-up? Or well tested/functional format?

    Hey! I'm about to assemble together a battery pack of 99x18650 (3A) li-ion cells. I am thinking a 3S configuration, and I was thinking to make the pack in three. In other words three packs of 3S 11P, with each a BMS of 40A range. And then connect them all with XT60s. I am fairly new to...
  18. tjobapuerh

    New iMax B6 Evo

    Hey ! Does anyone have experience with the new iMax B6 Evo? https://www.skyrc.com/Charger/b6evo I suppose it does the same as the old model, just better UI and whatnot. But regardless of the model, I was uncertain whether or not this also charges LiFePo4? For the Li-ion it reads 1-6 cells...
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