Search found 1685 matches

by flippy
Jan 23 2021 4:33pm
Forum: Battery Technology
Topic: 26s BMS for 600A max?
Replies: 15
Views: 1204

Re: 26s BMS for 600A max?

why would you? for a 600A rating you can just buy a 750A megafuse and holder for a couple of [insert local currency] at a marine shop. its a LOT cheaper, safer and just works. ig you rely on the bms over overcurrent you have a problem further upstream. people tend to forget the bms is a failsafe, no...
by flippy
Jan 23 2021 2:57pm
Forum: Battery Technology
Topic: Any Car Batteries You like?
Replies: 8
Views: 163

Re: Any Car Batteries You like?

just buy 2 12V winston/thundersky that fits. search for LP12V90AH, it will probably fit. if price is an issue just get the 60Ah version (LP12V60AH), its still big enough to crank a V10 schoolbus without issue at -20. and shop around, pricing is "bend over and cough" if you dont look around...
by flippy
Jan 02 2021 12:07pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1225
Views: 182531

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

I think depends on your tips. I've been doing fine after like 1000 welds
That is like <20% of a single battery for me.
by flippy
Jan 02 2021 6:21am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1225
Views: 182531

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

The 0.10mm thick copper may sound thin, but since copper is four times more conductive, with 1/4th the resistance (compared to nickel), the 0.10mm copper is equal in current-carrying ability to 0.40mm thick nickel. It's also cheaper and more readily available locally than nickel, plus easier to cut...
by flippy
Dec 29 2020 7:02am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1225
Views: 182531

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

get rid of the connector, bolt the welder to the capacitor block and make the leads longer. then you can probably also weld at a lower votage or use the voltage to better regulate the available current.
longer leads are more practical for making bigger batteries.
by flippy
Nov 03 2020 9:14am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1225
Views: 182531

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

Is there a way to connect 2 kWelds together to be able to handle more current? I don't need to double what one welder can do but I certainly feel the need for mine to handle probably 20 or 30% more juice to weld .20mm, pure nickel strips WITHOUT sticking electrodes. if the kweld is not enough for ....
by flippy
Oct 16 2020 4:34am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 211932

Re: bluetooth BMS?

broken connection. check the wire from the battery right up to the connector and check the connector itself.
by flippy
Oct 13 2020 12:48pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration
Replies: 10
Views: 466

Re: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration

max discharge current is set to 100A. that needs to be increased to the maximum.
by flippy
Oct 12 2020 12:19pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration
Replies: 10
Views: 466

Re: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration

no, you need to either stop charging at 4V or raise the upper voltage limit that the bms engages at. so 4.3V or higher so the battery can absorb the power you put back in during regen.

this is only an issue when you are fully charged. once you have driven a bit the problem will go away.
by flippy
Oct 04 2020 6:27pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration
Replies: 10
Views: 466

Re: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration

turn the regen off until the bms settings are changed. the speed hunting comes from the kelly not wanting to do the brick wall style that sevcon does and it just tapers off the acceleration. that jo-jo's a bit until the speed is stable. its mainly due to putting high voltage and currents in a motor ...
by flippy
Oct 04 2020 3:23pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration
Replies: 10
Views: 466

Re: 2500w / 100Ah Lifepo4 / KLS4812S controller e-scooter configuration

first focus on the bms. what limits do you have on that? a shutdown is basically always a bms that shuts the party down due to overvoltage during regen or overcurrent during acceleration. change settings on your bms to prevent a shutdown. does the speed hunting happen during driving or with the whee...
by flippy
Oct 01 2020 5:02am
Forum: Battery Technology
Topic: 0-120V 0-30A variable rectifier/amps/charger, is it ok?
Replies: 14
Views: 986

Re: 0-120V 0-30A variable rectifier/amps/charger, is it ok?

the reason you dont find them any is because they blow up. too small a package with shitty chinesium parts that need to work oustide optimal range means you blow the arse out of them in a few months. if you need a changer for a certain battery you need to get a charger that is optimized for that vol...
by flippy
Sep 29 2020 6:18am
Forum: Battery Technology
Topic: How to recell Bosch Powerpack batteries?
Replies: 15
Views: 7599

Re: How to recell Bosch Powerpack batteries?

its not a rumor, its very real. the bms has all its programming in RAM, not ROM/flash memory. removing the board from the batteries will cut the power to the ram and then all the programming is gone instantly. large recellers simply have a specilized 10 output power supply to keep the bms active dur...
by flippy
Sep 17 2020 5:43am
Forum: Battery Technology
Topic: mega copper battery spotwelder
Replies: 28
Views: 2688

Re: mega copper battery spotwelder

supercaps are actually a lot safer, if not in use it does not store power and you only need a small power supply to charge them, very little energy is actually "in use" at any given time.
by flippy
Sep 16 2020 9:48am
Forum: Battery Technology
Topic: mega copper battery spotwelder
Replies: 28
Views: 2688

Re: mega copper battery spotwelder

ridethelightning wrote:
Sep 16 2020 7:52am
as i recall dr bass blew up his spotwelder, i think he reversed polarity or something. he was using supercaps i think
that would happen no matter the power source
by flippy
Sep 15 2020 8:22am
Forum: Battery Technology
Topic: mega copper battery spotwelder
Replies: 28
Views: 2688

Re: mega copper battery spotwelder

i would think a dozen supercaps would be a more effective solution then using batteries. also simpler, safer and more robust then lipo. and more consistent to get insane amps.
by flippy
Aug 04 2020 3:00pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1225
Views: 182531

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

use a few taps of 80+ grit on the tips every 100 welds or so. just clean the cells with IPA before putting the nickel on.
by flippy
Jul 21 2020 8:32am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 81384

Re: QS 3000w midmotor

i see some version with chain drive and others with belt. does QS supply a belt option and what belt model does it have?
by flippy
Jul 11 2020 1:41pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1225
Views: 182531

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

agniusm wrote:
Jul 05 2020 5:03am
Ordered this unit for the odd jobs i have. Was wondering how many weld you get out of 5ah lipo?
just keep a dumb charger on it and keep it floating at 4V per cell.
by flippy
Jul 11 2020 12:56pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Kelly Controller 12V
Replies: 8
Views: 631

Re: Kelly Controller 12V

you can put a standard hall sensor on your existing brake lever and glue a magnet on the lever and set the controller to match so you regen before the pads touch the disk, that way you always use max regen when possible and only if you need more you can use the pads all on the same lever. lots of tr...
by flippy
Jun 29 2020 5:38am
Forum: E-Scooter and Motorcycle General Discussion
Topic: govecs go 3.4 high current warning light
Replies: 13
Views: 1181

Re: govecs go 3.4 high current warning light

Terber wrote:
Jun 29 2020 4:33am
Ok. Then I'll need the can to USB interface and connect to the controller and so on?..

Expensive cable.

Terje
yes, or ask help from a dealership or a forum member in your country that is willing to help that has the cable.
by flippy
Jun 27 2020 4:53pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Kelly Controller 12V
Replies: 8
Views: 631

Re: Kelly Controller 12V

no, you can not. the 12v can only deliver about 100ma. its only for signal.

it says it very clearly in the manual.
by flippy
Jun 17 2020 7:35am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Kelly or Sabvotom? which pure sine wave high amp controller to use?
Replies: 3
Views: 368

Re: Kelly or Sabvotom? which pure sine wave high amp controller to use?

just get the kelly. the advantages outweigh the "stigma" kelly has. they sell a LOT of controllers and its a proper "brand", so if there are issues they will get lots of attention. see tesla for example. 1 car breaks down and its national news depsite they having a million cars o...