Search found 1479 matches

by flippy
Oct 20 2019 2:05pm
Forum: General Discussion
Topic: 48v Ebike battery powering cordless 40v chainsaw or trimmer?
Replies: 11
Views: 344

Re: 48v Ebike battery powering cordless 40v chainsaw or trimmer?

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...
by flippy
Oct 16 2019 9:42am
Forum: Battery Technology
Topic: Changing the voltage on the 13S charger from 54.2V to 54.6V
Replies: 5
Views: 184

Re: Changing the voltage on the 13S charger from 54.2V to 54.6V

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.
by flippy
Oct 15 2019 2:48am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 884
Views: 101567

Re: kWeld - "Next level" DIY battery spot welder

compressing the gel makes it less effective....
by flippy
Oct 14 2019 12:42am
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 92
Views: 2020

Re: Samsung 40T and other cells like it?

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.
by flippy
Oct 13 2019 2:51pm
Forum: Battery Technology
Topic: AliExpress battery pack unboxing (for my eZuma project)
Replies: 226
Views: 11931

Re: AliExpress battery pack unboxing (for my eZuma project)

any data on how to program the speed or voltage range?
by flippy
Oct 13 2019 3:58am
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 92
Views: 2020

Re: Samsung 40T and other cells like it?

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.
by flippy
Oct 13 2019 2:45am
Forum: Battery Technology
Topic: How Hot Do BMS Fets Get?
Replies: 9
Views: 215

Re: How Hot Do BMS Fets Get?

open the bms and look at the fet numbers.

and ask the guy what currents he will be using.
by flippy
Oct 12 2019 9:39am
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 92
Views: 2020

Re: Samsung 40T and other cells like it?

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...
by flippy
Oct 12 2019 8:32am
Forum: Battery Technology
Topic: How Hot Do BMS Fets Get?
Replies: 9
Views: 215

Re: How Hot Do BMS Fets Get?

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...
by flippy
Oct 12 2019 5:39am
Forum: Battery Technology
Topic: Lithium variable voltage charger needed to 62v
Replies: 9
Views: 229

Re: Lithium variable voltage charger needed to 62v

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...
by flippy
Oct 12 2019 2:08am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1131
Views: 98619

Re: bluetooth BMS?

the download link is several pages back posted by me
by flippy
Oct 11 2019 12:02pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 884
Views: 101567

Re: KWeld modding

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. :wink:
by flippy
Oct 11 2019 7:22am
Forum: Battery Technology
Topic: 13s charger for low SOC charging
Replies: 29
Views: 442

Re: 13s charger for low SOC charging

all non-smart/programmable bms have a balance voltage above 4.2V so that wont work in most cases.
by flippy
Oct 11 2019 6:37am
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 92
Views: 2020

Re: Samsung 40T and other cells like it?

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...
by flippy
Oct 11 2019 4:35am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1131
Views: 98619

Re: bluetooth BMS?

you need to disconnect ALL users before callibarating the shunt. ANY current flow will mess up the reading.
by flippy
Oct 10 2019 11:56am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1131
Views: 98619

Re: bluetooth BMS?

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. :mrgreen:
by flippy
Oct 10 2019 11:29am
Forum: Battery Technology
Topic: 36v DC to 240v AC(uk)
Replies: 8
Views: 188

Re: 36v DC to 240v AC(uk)

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...
by flippy
Oct 10 2019 8:52am
Forum: Battery Technology
Topic: 36v DC to 240v AC(uk)
Replies: 8
Views: 188

Re: 36v DC to 240v AC(uk)

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
by flippy
Oct 09 2019 2:21am
Forum: Battery Technology
Topic: ENNOID-BMS for 48V to 400V lithium-ion battery pack
Replies: 120
Views: 11031

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

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...
by flippy
Oct 08 2019 3:33pm
Forum: Battery Technology
Topic: ENNOID-BMS for 48V to 400V lithium-ion battery pack
Replies: 120
Views: 11031

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

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 ...
by flippy
Oct 08 2019 3:24pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 884
Views: 101567

Re: kWeld - "Next level" DIY battery spot welder

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.
by flippy
Oct 08 2019 9:36am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 884
Views: 101567

Re: kWeld - "Next level" DIY battery spot welder

does the thicker leads also help with the cable length performance
by flippy
Oct 08 2019 6:06am
Forum: Battery Technology
Topic: ENNOID-BMS for 48V to 400V lithium-ion battery pack
Replies: 120
Views: 11031

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

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.
by flippy
Oct 08 2019 4:52am
Forum: Battery Technology
Topic: ENNOID-BMS for 48V to 400V lithium-ion battery pack
Replies: 120
Views: 11031

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

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.
by flippy
Oct 07 2019 3:08pm
Forum: Battery Technology
Topic: lightweight < 2 kg electric scooter battery
Replies: 6
Views: 212

Re: lightweight < 2 kg electric scooter battery

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