Search found 178 matches

by vex_zg
Aug 26 2017 7:54am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 4363
Views: 426898

Re: OpenSource firmware BMSBattery S/Kunteng KT controllers

Whats the best place to buy Kunteng controllers? I can't find them on aliexpress/baba and their web has no webshop http://www.szktdz.com
by vex_zg
Aug 25 2017 8:44am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1271
Views: 273522

Re: Compact Field Oriented Controller, ASI + Grin, limited r

I'm on the outlook for the next controller... Given suitable heatsinking: what is the max continuous battery current phaserunner can handle? From what Justin told me and other experiences from users on the forum, about 70A continuous phase amps. More info here https://endless-sphere.com/forums/view...
by vex_zg
Aug 25 2017 4:57am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

well, the funny thing is that the max unloaded motor speed does not seem to depend on voltage. With battery at 60% it is the same as with battery at 100% which probably means that controller is limiting RPM. So by raising only voltage I would not gain more speed. You need to find out how the contro...
by vex_zg
Aug 25 2017 4:02am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

In the typical BMS, the gates get powered from a tap on cell #3, which is around 12v. No voltage regulator. From the cell 3 tap, it goes through a high value resistor to the gates and there are transistors which can pull the gates to ground. are you saying that BMS "decides" whether to ke...
by vex_zg
Aug 24 2017 3:59pm
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

it's 3x 220u @50v. so way below your 1000u threshold. I think it will be no problem. A while back, I tested a solid state switch that works in a similar manner. Sort of wimpy gate drive to turn on. It worked fine at 60V into 1000uF. I tried a gigantic 10,000uF cap and it blew up. Based on what I've...
by vex_zg
Aug 24 2017 9:18am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

well, the funny thing is that the max unloaded motor speed does not seem to depend on voltage. With battery at 60% it is the same as with battery at 100% which probably means that controller is limiting RPM. So by raising only voltage I would not gain more speed.
by vex_zg
Aug 24 2017 6:37am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1271
Views: 273522

Re: Compact Field Oriented Controller, ASI + Grin, limited r

I'm on the outlook for the next controller...

Given suitable heatsinking: what is the max continuous battery current phaserunner can handle?
by vex_zg
Aug 24 2017 6:26am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

allright, thanks to all for comments, I'll keep you posted how this goes.
by vex_zg
Aug 24 2017 3:38am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

so, with a full battery (10s=42V) and no load (wheel spinning freely in the air) the motor tops out at 26km/h, therefore I believe it to be reaching its max speed restricted by voltage, not amperage. How do you come to that conclusion? You need to try again with a run down battery, say 32v, to see ...
by vex_zg
Aug 24 2017 1:52am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

All answers and info was already given to me in previous posts so it is more of a rhetorical question. I'll decide between 13s / 14s /15s considering the controller-frying-risk mostly. Just keep in mind that many controllers are built with components that are rated for a maximum of 60Volts. The pop...
by vex_zg
Aug 24 2017 1:46am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

velias wrote:Give it up and buy a new one!
You could have flipped burgers for the number of hours you have wasted on this to pay for another one.
I guess most of ppl on this forum are more inclined towards learning and DIY vs. turnkey solutions. Repairing is good for environment :)
by vex_zg
Aug 23 2017 4:15pm
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

regarding the pull down resistor for which fechter is proposing 4.7MOhm. .. ...yeah this value is not that critical. Yes it will cause continuous drain of the gate driver. But 100kOhm @ typically max 20V for Vgs will only incurr 0.2mA current. So I don't thin it would be stressing gate driver. I per...
by vex_zg
Aug 23 2017 4:01pm
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

so, with a full battery (10s=42V) and no load (wheel spinning freely in the air) the motor tops out at 26km/h, therefore I believe it to be reaching its max speed restricted by voltage, not amperage. with the wheel being 29" this equals to some 3,12 rotations per second at max speed, or 187 rot...
by vex_zg
Aug 23 2017 2:02pm
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

in my opinion grounding the FET gate should be done only in conjunction with disconnecting the gate driver (otherwise you could keep the gate driver supplying current trying to keep the BMS on while you are trying to force it off) Yes, that's the idea. It would look like this: Gate Drive Switch.jpg...
by vex_zg
Aug 23 2017 10:11am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

has anyone of you an idea where to add an ON/OFF switch to use the BMS as switch between battery and controller? i put a switch between the thermal control switch which works, but you need to reset the bms afterwards to make it work again, so this method is not appropriate. any other ideas? i'd lik...
by vex_zg
Aug 23 2017 7:55am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

thanks for clarification. i would have directly pulled down GATE to GND to shut down the bms. so a toggle switch in the gate line, toggling the GATE between whatever it was connected to before, and GND. correct? or do i need the resistor? Ok so let’s presume the switch has 2 positions and the mosfe...
by vex_zg
Aug 23 2017 7:04am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

:?: https://endless-sphere.com/forums/viewtopic.php?f=2&t=84856&hilit=bms+switch thanks. funny to see that i posted in that thread as well (w/o having read the first pages of course). imho i already tried to lift the gate signal (2y ago) and put a switch in line. can't remember why it didn'...
by vex_zg
Aug 23 2017 6:02am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

Possible: you have to "intercept" gate signal of the mosfets on the bms
by vex_zg
Aug 23 2017 1:11am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

this guy is an inspiration, really pushed the small hub motor far beyond the limits. Filled the hub with ATF fluid. Stripped the gears then replaced them with metal ones. http://www.bentrideronline.com/messageboard/showthread.php?t=90633 I'll figure out the no loaded/full charged/no speed restricted...
by vex_zg
Aug 22 2017 5:07pm
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

Re: 250W geared hub max voltage?

Safe, continuously? Well it's rated for 250W, so that's the safe rating. Under normal use, maybe a little higher or continuous operation. Voltage won't matter much as long as you don't exceed the wattage. Of course there or other considerations like the gears/clutch stripping, etc., if you give it ...
by vex_zg
Aug 22 2017 6:26am
Forum: EBike Technical
Topic: 250W geared hub max voltage?
Replies: 20
Views: 3862

250W geared hub max voltage?

What do you think is a max safe voltage/current to drive this one continuously? It's rated to 36V / 10s battery.
by vex_zg
Aug 21 2017 6:03am
Forum: EBike Technical
Topic: Magura MT7 caliper dimensions ? (for fitting to hub motor)
Replies: 2
Views: 1210

Re: Magura MT7 caliper dimensions ? (for fitting to hub moto

Thanks. I bought them. It's around 16.2mm in my case, so one needs a tiny bit more clearance than than.

I did manage squeeze this in with Mxus and standard MBT 135mm dropout. Great brakes. Can lock out rear wheel with mxus.
by vex_zg
Aug 21 2017 5:56am
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

ah yes I've seen the thread with the arrow bikes. NYC is quite a busy place to live. Quite the opposite of Stockholm outskirt I am in now. I was thinking to add an array of leds connected to the Balance resistors so one could see when balancing is taking place (on it's own). I sent an email to bestt...
by vex_zg
Aug 20 2017 2:32pm
Forum: Battery Technology
Topic: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS
Replies: 49
Views: 5209

Re: Autopsy of a dead BestTech Power HCX-D131 14S 80A BMS

matador, did you find manage to find anywhere the GCLQ part? I also have a fried BMS / one balancing circuit and would like to fix it, I onlz need one GCLQ element. This was my mini investigation https://endless-sphere.com/forums/viewtopic.php?f=14&t=90054&p=1312647&hilit=besttech+failed...