Recent content by x4dow

based on the first photo alone. looks like a direct short in the cells, where the blue plastic might have been damaged (vibration?) The casing below the blue plastic is basically a negative terminal. so if cells in series rub together and wear the blue plastic, you have a direct short.

active or passive balancing wouldnt save this problem. Its most likely a lose terminal. the BMS would never stop this unless it had a ton of temp sensors on every cell

just prompted me to recheck my battery and 1 terminal wasnt very well tight and the busbar was clearly hotter on that 1 terminal. I bet you had a similar issue. 1 loose terminal, lots of resistances, lots of heat, boom

1 terminal badly tighten can get really really hot. its the only possibility i can think off. I had batteries i finished building and then run 100A+ through them, and then feel the busbars, if 1 of them is clearly warmer , is usually a connection there that isnt 100% tighten.

is it because the ground is bound to the neutral on the AC out?

A little bit confused> I have one of those "all in one" 24v inverters (such as this: https://m.media-amazon.com/images/I/61AP9YfHcmL.jpg ) and when the inverter is on. the "AC IN" ports between Ground and live and Ground and neutral show a voltage of around 80-100V. No voltage between Live...

pack burns because no BMS, The OP insist to talk about carboard and what not.

this looks more like a "why you should use a fuse"

the fact that you top balance them doesnt make them perfect. do a capacity test

anyone thought of pairing a small compatible 16s Lifepo4 battery, and then parallelling that battery to a massive DIY one?

only bought a set of litokala. All shit, some arrived at like 2.0v, swollen, missmatched, used. Also had marker numbers on it like 1 3 3 4. as if they were part of some mismatched packs that were taken apart.

all my daly's so far i just touch P- on B- and it wakes up.

no. the balance between extra drag vs production you'd find you'd need to keep the car parked in the sun for a full month to compensate for 30-60min of driving.

i would also worry with the bottom cells being crushed under the weight

single 4s2p battery with 1 bms.