Recent content by kZs0lt

Please consider the accuracy of the TP4056 module is pretty low, the datasheet says Charge Voltage with 1.5% Accuracy. This means you can end up anywhere between 4.137v and 4.263v. While an RC charger has a typical 0.2% accuracy, charge voltage 4.2v +- 10mV. You can find some real life test info...

Guys, can you give details about the underlying solution to this problem? Is this the k-partitioning problem? What optimization tools/algorithms can be used? I'm having problem matching my cells, because the cells have high internal resistance and a sort of 'residual capacity', meaning that...

The term 'Prismatic' refers to the form factor(shape) of the battery cells. Laptop cells come in either cylindrical or prismatic form. By far the most common cell geometry used in laptop batteries are the 18650 cylindrical cells, which are a cylinder with 18mm diameter(9 mm radius) and 65mm...

Thanks for the additional info gwhy! My understanding is that phase amp is what really matters for FET durability. When a controller is fully loaded set to say 100A phase will generate the same amount of heat in a FET with no regard to battery voltage if it is 24v or 100v. I'm not sure how...

It is more simple, but not as explicit, it could be that you are running 100v with 100amp phase and 48amp battery, or 50v with 200A phase and 96A battery. For a FET that is limited in current (and voltage) is not the same. So, Thanks, Zsolt

Could you please add some detail? What type of controller do you have, what FETs is using, what are your settings (battery/phase amps), are you using the stock shunt(aprox resistance if you know), what battery and motor are you using?

I want to bring out maximum performance from my 12 FET controller. What would be the max. safe Phase/battery current? It is a EB212 controller with stock shunt(2 wires, aprox 2.5mOhm), fitted with (12) 4110 FETs. Battery and Phase traces have been beefed up considerably, battery wires are aprox...

I'm experiencing cutouts as well with my 6Fet and 12Fet controllers fitted with 4110 FETs. I'm using 9C 9x7 motor. The 6FET controller works fine with 20A battery, but set to 40A battery/100A Phase it cuts out. The 12 FET controller I have set to 57A battery (max in Parameter designer) on the...

I have about 6-8 cycles on them, one or two were deep discharges, to what I call 100% DOD. I'm running them without a BMS, on charge they are about max 0.02-0.03v apart, but I do not charge them to full 4.20v/cell. At the low end they are still in balance of 2-3 mV difference to about 15Ah, but...

These are well engineered cells, probably made by Panasonic, they are manufactured in Japan, in aluminum cases, every cell has it's own fuse, so they should be Ok. Yes, they are old technology/chemistry, they have not been maintained/conditioned correctly, so they are to be handled with care and...

These batteries came in original factory packages, so very probable they have never been used, just self discharged very very slowly. It's a big difference compared to DISCHARGING them to 0.0v or even reverse them for some moments. And 85% capacity for 0 cycles is not a good thing, taking into...

Sorry, it is actually 14P12S as one laptop battery consists of 2P3S prismatic cells. Originally rated 10.8v, 3.6Ah, so cells were 1.8ah nominal when new. Based on my testings, cells deliver around 1.5-1.6Ah when charged to 4.2v on low current consumption(controller is limited to 20A, so <1C...

I have completed the battery few weeks ago. I have built it from 28 laptop packs, paralleling 7 batteries, and putting 4 in series. Making a total of 12S7p. First ran consumed 19.6Ah, around 850Wh, on 63km distance, controller limited to 15A. At that point one of the cell groups was almost...

Ok, thanks for your responses, I have learned some from this mistake. I have installed every component on the new pcb, so I am using it for now. I will come back and troubleshoot the old one, if I get some new FETs and voltage regulators. New pcb cuts out from a stand on high current(set to 40A...

Is the Crystalyte skewed stator design smoothing out torque ripple and reducing motor noise or it has effect only on cogging?