Search found 125 matches

by multifrag
Aug 10 2020 5:15pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1527
Views: 192967

Re: bluetooth BMS?

My ant bms broke when I turned it on at last ride: I took it apart to get a closer look at what is going on. It looks ok at first glance, but when I measure the discharge fets are shorted. It looks like all of them are driven from the same source, with just an individual resistor to each mosfet. I ...
by multifrag
Jul 17 2020 4:15pm
Forum: E-Bike Technical
Topic: Design suggestions on polyurethane stopper for bbso2
Replies: 6
Views: 399

Re: Design suggestions on polyurethane stopper for bbso2

Why didn’t you rotate the BBS02 all the way until it made contact with the frame? If I would have just left it connected to the frame, the motor housing would eventually bend the frame tube. I can tighten it stationery, but the second I would apply the throttle the torque that would rotate the moto...
by multifrag
Jul 17 2020 10:28am
Forum: E-Bike Technical
Topic: Design suggestions on polyurethane stopper for bbso2
Replies: 6
Views: 399

Re: Design suggestions on polyurethane stopper for bbso2

Why didn’t you rotate the BBS02 all the way until it made contact with the frame? a rubber bumper allows a lot more relative movement than that to loosen the lockrings and chafe the bottom bracket shell. Motor housing directly against the bike’s downtube is the most immobilized you’re going to get....
by multifrag
Jul 16 2020 4:35pm
Forum: E-Bike Technical
Topic: Design suggestions on polyurethane stopper for bbso2
Replies: 6
Views: 399

Design suggestions on polyurethane stopper for bbso2

Long story short, bafang lock nut chewed up my first ebikes bottom bracket(aluminum). The motor wasn't holding very well as a result I've made polyurethane stoppers and went with clamping force coming solely from a hose clamp around the frame tube(images below). Worked great for the past 2 years. I'...
by multifrag
Jun 04 2020 9:25am
Forum: Battery Technology
Topic: Which BMS is better: ANT or JBD?
Replies: 11
Views: 402

Re: Which BMS is better?

Interesting that the first link provides a gps tracking device for your ebike(though you have to buy it separately). I only used smart bms with Xiaoxiang app and they work pretty well. Don't forget to buy a Bluetooth module as the first link does not provide one(based on the description). BBS02 does...
by multifrag
Feb 07 2020 10:29am
Forum: Battery Technology
Topic: 3D Printed Hailong/Reention Style E-Bike Battery Case
Replies: 12
Views: 1289

Re: 3D Printed Hailong/Reention Style E-Bike Battery Case

I'm only using 3d printing for prototyping and would never use it as a final build. There are too many problems with layers based plastic prints... Printed parts only strong in one direction. There will be problems with making it water tight The problem of trapped heat from the cells not to mention ...
by multifrag
Dec 12 2019 5:06am
Forum: Battery Technology
Topic: Improving Sunko 709A (220V) Current capabilities
Replies: 2
Views: 626

Re: Improving Sunko 709A (220V) Current capabilities

I had the same problem using one of the 12 volt welders. When I upgraded the probe cables from 8 gauge copper clad to 6 gauge pure copper welding cable it was a huge improvement. No more hot cables to hold, with copper clad I was barely doing a few welds before they got too hot to hold. In the lowe...
by multifrag
Dec 11 2019 9:36am
Forum: Battery Technology
Topic: Improving Sunko 709A (220V) Current capabilities
Replies: 2
Views: 626

Improving Sunko 709A (220V) Current capabilities

I've watched a video on how to improve a Sunko spot welder. Found some premade spot welding tips for £15 and made an upgrade. J2noz_7PGsA Works like a charm. If you have the tools, patience and find the original pen lacking in performance this might be for you. Unfortunately I don't have a clamp met...
by multifrag
Dec 05 2019 7:18pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1217
Views: 109861

Re: APL's DIY axial-flux motor

I ordered out some axle aluminum, so at least I can get going on that. Hopefully I can do a better job this time and get this thing to spin straight. I think the hardest part of turning the axel is to get the bearing ID to fit just right, and wind up with somewhat of a press fit. Other than that, I...
by multifrag
Nov 25 2019 4:28pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 51477

Re: Li-ion cells cycle ageing

Thank you for your thoughts, they are helping me to assort my own. I don´t want to go to 1 000 cycles, my idea was to finish somewhere at 600 – 700 cycles. Another testing fixture arrived this week, so from Friday is 30Q already running on fifth channel at the same parameters. MJ1 will start next w...
by multifrag
Nov 25 2019 3:04am
Forum: Battery Technology
Topic: Physical damage to the cell, happy I'm not on fire
Replies: 6
Views: 1146

Re: Physical damage to the cell, happy I'm not on fire

I had something similar happen, but the cells aren't physically damaged that I can see (battery was padded), but the twisting force cracked some of the heat shrink on the cells. Any suggestions? https://imgur.com/a/VfJzdd5 Do I have to buy a spot welder to fix this "safely"? If heat shrink is damag...
by multifrag
Nov 21 2019 8:35am
Forum: Battery Technology
Topic: Physical damage to the cell, happy I'm not on fire
Replies: 6
Views: 1146

Re: Physical damage to the cell, happy I'm not on fire

If I ever wore a battery pack on my back besides better protection for the batteries , I Would protect my back / Spine , as well I would be wearing something like this ... http://www.rideicon.com/gear/mens/protective/field-armor-stryker/green or this ...http://www.rideicon.com/gear/mens/protective/...
by multifrag
Nov 20 2019 9:04am
Forum: Battery Technology
Topic: Physical damage to the cell, happy I'm not on fire
Replies: 6
Views: 1146

Re: Physical damage to the cell, happy I'm not on fire

I suspect you "dodged the bullet" on that one. specifically about 70 rounds of ammo in your backpack. Suppose you bumped your head and were a little dazed, could you have gotten the backpack off quickly enough? Buy a new cell and fix the battery but please find a better way to protect it. Maybe if ...
by multifrag
Nov 19 2019 1:31pm
Forum: Battery Technology
Topic: Physical damage to the cell, happy I'm not on fire
Replies: 6
Views: 1146

Physical damage to the cell, happy I'm not on fire

Pictures of internals below I could never find the time to build a hard casing for my 14s triangular battery, so just had it in my backpack for the time being. Recently fallen off my bike and damaged one of the cells. Happy to say that I did not become crispy chicken... :flame: 1.jpg 3.jpg From vis...
by multifrag
Nov 14 2019 8:02am
Forum: Battery Technology
Topic: Building 13S17P battery, need some criticism on layout
Replies: 9
Views: 984

Re: Building 13S17P battery, need some criticism on layout

The cell arrangement looks good. With that big of a battery pack and chemistry you could easily push 80 to 90 Amps. Are you planning on using a BMS? The leftover area limits the size of your controller and BMS. I assume you’ve taken that into account. If you ever want to upgrade to a more powerful ...
by multifrag
Nov 11 2019 2:59pm
Forum: Battery Technology
Topic: Building 13S17P battery, need some criticism on layout
Replies: 9
Views: 984

Building 13S17P battery, need some criticism on layout

I'm planing on retiring by old 13S battery and replacing it with 13S17P of LG M29 cells. For now the pack will only be pulling 25A, maybe some day I will look into pushing 40A if range won't suffer much. Well above what the cells can do, but that's just half the story. The limiting factor is my layo...
by multifrag
Oct 28 2019 10:02am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 560
Views: 72910

Re: QS 3000w midmotor

Planning on ordering this to the UK. https://www.aliexpress.com/item/33056354249.html?spm=2114.12010612.8148356.30.543563f84Jjq7c Anything I should know before I do? Thanks Not related to the product, but due to shipping taking long time we have no idea what will be with brexit. Your parcel might b...
by multifrag
Oct 18 2019 7:42am
Forum: Battery Technology
Topic: ANT BMS High Pitch Sound
Replies: 3
Views: 317

Re: ANT BMS High Pitch Sound

Does it sound like GPU coil whine? If yes it's probably your inductors and there is little you can do about it apart replacing them. It doesn't affect the work of the BMS.
by multifrag
Sep 13 2019 10:25am
Forum: Motor Technology
Topic: Ashwoods Axial Flux motors
Replies: 6
Views: 6180

Re: Ashwoods Axial Flux motors

Marky116 wrote:
Sep 09 2019 3:11pm
just spotted 2 that have came on eBay for sale, are they cheap or expensive? Item number 113882732493
I'm amazed that in the booklet they only state continuous power of 3KW for a 15KG motor...
by multifrag
Jun 18 2019 7:33am
Forum: Battery Technology
Topic: ULtra Compact 1800W charger + Eltek programming
Replies: 291
Views: 56147

Re: ULtra Compact 1800W charger + Eltek programming

I'm having trouble with reading CAN data after plugging in my battery. The charger stops sending CAN data in CV state. When battery charging switches to CC the data starts appearing. Electrically everything works, but I can't display the data on the screen for the CV period.
by multifrag
Apr 24 2019 2:23am
Forum: E-Bike Technical
Topic: Series connection Charges/Discharges quicker
Replies: 3
Views: 318

Re: Series connection Charges/Discharges quicker

Could be anything that reduces the capacity of the group, so either of those is possible. Is also possible that the channel on the BMS has a balancing shunt stuck "on" so it's always draining that group. This can be tested by measuring voltage across teh shunt resistors. Any resistor with a voltae ...
by multifrag
Apr 23 2019 2:57pm
Forum: E-Bike Technical
Topic: Series connection Charges/Discharges quicker
Replies: 3
Views: 318

Series connection Charges/Discharges quicker

I have a 13s9p battery. One of the series connection get's easily out of balance. Either when charging it reaches 4.2V quicker and goes beyond, or when discharging it goes into LVC and stops the battery from discharging fully. My question is, could this be just the nickel strip having loose connecti...
by multifrag
Apr 17 2019 5:53pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang i thin I hate you... ( HALP ME!)
Replies: 18
Views: 1641

Re: Bafang i thin I hate you... ( HALP ME!)

Made it home, though. 8 miles hanging a foot off the crank arm and bashing gears. Can anybody recommend replacement crank arms? Ones without sucha " reputation" ...? TIA. Jp I use Shimano FC-E6000. Cheap and better quality over Bafang. Only problem is to find them in stock, had to import mine from ...
by multifrag
Mar 22 2019 5:02pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1527
Views: 192967

Re: bluetooth BMS?

Hello! Friends, tell me, please, have you encountered the problem of reading and changing data in the BMS from a computer? In my PC version of the software, the first tab with cells info works fine, but if I try to do a calibration on the third tab or read the data on the second tab, I get a connec...
by multifrag
Mar 19 2019 9:25am
Forum: Battery Technology
Topic: Looking for 1s custom size LiPo battery
Replies: 0
Views: 307

Looking for 1s custom size LiPo battery

I've already tried aliexpress. Got a battery close to required size, but Wh/l is lower than the battery it was suppose to replace. Right now my device uses ''653850 samsung phone cell'' from 2012. It has 5Wh and 381.7Wh/l. The battery I received from aliexpress was suppose to be 8.9Wh and 555Wh/l, b...