Endless Sphere

the dewalt "protection" can be "fixed" with a simple resistor to fake the battery temp sensor. measure the T and negative resistance port of a working battery and grab a regular resistor and put that in the matching side of the tool. i just put a resistor in the handle of my tools so it always works...

you cn change the voltage with the trim pots on the top right.

but do NOT do this unless you have a smart bms you can set the balance voltage on.

compressing the gel makes it less effective....

rg12 wrote: ↑

Oct 13 2019 6:57pm

It's pretty hard to calculate as it's so random, for me it's about 5 second long bursts that come let's say every 20-30 seconds but still super hard to estimate...

mount a analog ammeter. just a regular "ye olde" meter. the needle with even out the readings.

any data on how to program the speed or voltage range?

why do you stop recording after stopping the discharge? in my experience the temperaure continues to rise in high amp testing as the heat takes time to travel to the outside of the cell.

open the bms and look at the fet numbers.

and ask the guy what currents he will be using.

i use the same one. but callibrating is a b itch. i also got a single channel one that can do 50A for testing big cells or large parrallel cell blocks. I don´t like ZKETECH calibration, in fact I hate ZKETECH calibration :-) I killed my EBC-A10H tester by incessant calibration, I killed also one ch...

if you have the 300A 32S bms from the bms thread then it wont get hot under 100A. if you are going to do a 100+ amps continous you will see "uncomfortable" temperatures. but those can be set in the firmware so it simply cuts out so you dont blow the fets. if you go beyond 100A continous i might reco...

Looking for a quality lithium carver for my lithium golf cart pack. Need to charge to 62v. Prefer a voltage selectable unit. Thought about the Chargery 1500w model. But some poor Chargery comments have me questioning this option. Thx you need to give actual specs. do you want only voltage or also a...

the download link is several pages back posted by me

ElectricGod wrote: ↑

Oct 11 2019 10:50am

lol...figures...the one resistor of an impossible to scrounge value...

if its on mouser or digikey its just another number on your BOM list.

all non-smart/programmable bms have a balance voltage above 4.2V so that wont work in most cases.

ZKETECH EBC-X0510 is 8 – channel equipment for long term cycling obtainable at Aliexpress. Allows full control of testing parameters : charge and discharge currents, charge cut-off, charge and discharge voltage, waiting time between cycles. Accuracy better than 0,3 %. i use the same one. but callib...

you need to disconnect ALL users before callibarating the shunt. ANY current flow will mess up the reading.

john61ct wrote: ↑

Oct 10 2019 9:13am

if it ain't broke, don't fix it

if it aint broke: mess with it until it is.

i built a couple batteries for 24v and even a 3kW inverter. the amps and voltage drops are just nuts 300A+ for a 3kW inverter at 12V, 150A for 24V and just 75A at 48V. its also considerably more effcient to have 48v just in usable battery capacity as the sag is much more controllable under load so y...

i would consider breaking the packs apart and build 1 big 48v pack and get a inverter for that.

36v inverters dont exist or are at leat very rare

these bms are not generally cost effective for small battery banks so its reasonable to assume you have/want a big and high voltage battery and something considerably more substantial then a ebike and probably have a battery with a weight to match. for smaller sub 100v batteries this bms is not a co...

Flippy I gave my reasons very clearly. Nothing EV nor commercial is relevant i understand that. but please understand as well that its simply not a good idea to have big machinery have modulair batteries and try to make some frankenstein bms style setup. if you want something like that to work you ...

can you make a model of those handles so they can be 3d printed? i got some high temp filament i would like to try on this application.

does the thicker leads also help with the cable length performance

you need to treat them as separate strings and only connect the end of the strings. when doing that when 1 battery string fails you can still run the machine to limp back home for example.

or just make it 1 big battery wich is certainly the better option.

why would you ever change battery capacity on the fly? i cannot see any commerical reason to make a vechicle or device that can do that wich the size of battery this bms is designed for.

what do you find important? range? price? power output? lifepspan?