Search found 113 matches

by owhite
Oct 29 2020 9:18pm
Forum: EBike Build Threads
Topic: 5kW ebike motor / controller testing
Replies: 24
Views: 2745

Re: 5kW ebike motor / controller testing

Thank you for your comments. I calculate the weight of the swing arm to be 7 pounds. The frame (with old swing arm) is 6. I did a ballpark estimate and all up weight of the bike (motor, batteries, wheels, forks) to be in the 75 pound range. Thanks for advice on weight costs for building solid parts ...
by owhite
Oct 29 2020 9:07am
Forum: EBike Build Threads
Topic: 5kW ebike motor / controller testing
Replies: 24
Views: 2745

Re: 5kW ebike motor / controller testing

More notes just to have a record of progress: I grabbed up this 2007 frame on ebay: https://i.imgur.com/yyEgZCn.jpg It wont fit my fat tire wheel so I designed parts to get cut by water jet https://i.imgur.com/oYWNBs2.png That I will weld partly with a shit welder in my basement, and then take to a ...
by owhite
Oct 03 2020 10:45am
Forum: EBike Build Threads
Topic: 5kW ebike motor / controller testing
Replies: 24
Views: 2745

Re: 5kW Rattan Fat Bear Conversion

Another installment on setting up my build. This topic is "So your system isnt working and youre trying to figure out if it's the motor or the controller or something else." or "Beginner's notes on popping a MOSFET". There's lots of posts about this on ES, but maybe this will be ...
by owhite
Sep 29 2020 12:28pm
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 173
Views: 39348

Re: BESC - beefed up VESC motor controller for high power ebikes

People. PCBway does Printed Circuit Board Assembly (PCBA) and the prices really arent that bad. In general you pay around $50 for the assembly per board. Additional costs include the cost of the PCB, and the parts. I've done it before and am familiar with the whole process. The main issue would be s...
by owhite
Sep 23 2020 5:38pm
Forum: EBike Build Threads
Topic: 5kW ebike motor / controller testing
Replies: 24
Views: 2745

Re: 5kW Rattan Fat Bear Conversion

Thanks for the comments guys. It's refreshing for an uninitiated person to be able come to a site and get constructive information about a build.
by owhite
Sep 20 2020 8:50pm
Forum: EBike Build Threads
Topic: 5kW ebike motor / controller testing
Replies: 24
Views: 2745

5kW ebike motor / controller testing

Hello folks I'm posting this so I'll have a chronicle of some testing I'm doing for an eventual final build. This is going to involve a bunch of prototyping before I get to the final setup, so here goes. Right now I'm starting with a Rattan Fat Bear as a test platform: https://imgur.com/McRF5dY.jpg ...
by owhite
Sep 20 2020 4:01am
Forum: EBike General Discussion
Topic: Fat tires for class 3+ urban utility bikes?
Replies: 20
Views: 2118

Re: Fat tires for class 3+ urban utility bikes?

On the Chaoyang tire, what's this interior portion that's shown in the picture?

Image

is that just a rim with no spokes that will not ship with the tire?
by owhite
Sep 09 2020 12:13pm
Forum: EBike General Discussion
Topic: 24s build - can anyone suggest a good headlight?
Replies: 4
Views: 236

Re: 24s build - can anyone suggest a good headlight?

thanks all - i am planning on a step down converter to be on board, but it seemed sort of silly / inefficient to do that for the headlight. but both of you make the point there are more options to convert to 12v. My use will be for street and i need to be nice to the on-coming traffic, so hi/lo is a...
by owhite
Sep 08 2020 2:54pm
Forum: EBike General Discussion
Topic: 24s build - can anyone suggest a good headlight?
Replies: 4
Views: 236

24s build - can anyone suggest a good headlight?

Yes, I could use two 48v headlights in series but I'm curious if anyone knows of an alternative for the 100v DC range.

thanks.
by owhite
Aug 30 2020 7:04pm
Forum: Battery Technology
Topic: Open source BMS for 48V to 400V lithium-ion battery pack
Replies: 325
Views: 59888

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

We make a lot of training videos at my research facility. Trust me, I completely understand. And by all means, take time for your kid. :-)

Again, it's a great product. Thank you for this great effort!

owen
by owhite
Aug 27 2020 5:24pm
Forum: Battery Technology
Topic: Open source BMS for 48V to 400V lithium-ion battery pack
Replies: 325
Views: 59888

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

ENNOID, thank you for all of this fantastic hardware and all of your amazing effort. I'm sure youre very busy, but I was wondering if you have any videos showing how the ENNOID-BMS configuration tool works. My application would be to do balance charging of a 24S set cells, that are 16Ah, and 12C. I ...
by owhite
Aug 26 2020 7:44pm
Forum: Battery Technology
Topic: design for an arduino balancer , what do you think ?
Replies: 8
Views: 266

Re: design for an arduino balancer , what do you think ?

The op-amps may not be a hack. Take a look at this: https://circuitdigest.com/microcontroller-projects/multi-cell-voltage-monitoring-for-lithium-battery-pack-in-electric-vehicles The idea here is that you can use op-amps to measure battery voltage, instead of using voltage dividers. I believe you wi...
by owhite
Aug 26 2020 2:20pm
Forum: Battery Technology
Topic: design for an arduino balancer , what do you think ?
Replies: 8
Views: 266

Re: design for an arduino balancer , what do you think ?

So I agree with your point about stacking voltage dividers - each channel would definitely need to be calibrated. I've been thinking about making a multiplexed ADC to arduino, not for balancing really, but to at least monitor each cell. Some of what i've been reading on here is that most people char...
by owhite
Aug 25 2020 5:47pm
Forum: EBike Technical
Topic: A123 cells BMS off the shelf?
Replies: 4
Views: 172

Re: A123 cells BMS off the shelf?

Again, I am NOT an expert, I came here to learn. For example one member pointed out the role of the BMS is NOT to help with balanced _charging_. Hey, I thought it was, but my mistake there. However, on this thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=107913 the point is being ...
by owhite
Aug 25 2020 4:04pm
Forum: Battery Technology
Topic: Feedback for ebike battery build: 20s lithium polymer pouch
Replies: 13
Views: 582

Re: Feedback for ebike battery build: 20s lithium polymer pouch

my mistake i thought the purpose of the BMS was to monitor charging.

i'll do some research for balanced chargers.
by owhite
Aug 25 2020 3:08pm
Forum: EBike Technical
Topic: A123 cells BMS off the shelf?
Replies: 4
Views: 172

Re: A123 cells BMS off the shelf?

I know these links dont last very long but I'm considering using one of these: https://www.aliexpress.com/item/4000822738214.html?spm=2114.12010612.8148356.1.395470ec6syKag search on the terms: "bms 77.7V lithium polymer daly" on google. bear in mind I'm on another thread where we are disc...
by owhite
Aug 25 2020 12:49pm
Forum: Battery Technology
Topic: Feedback for ebike battery build: 20s lithium polymer pouch
Replies: 13
Views: 582

Re: Feedback for ebike battery build: 20s lithium polymer pouch

So I really appreciate input from both of your posts. The posts are interesting in their contrast. I completely agree with idea of doing something modular. Youre right it's a mistake to make one 24S2P big mega-block of batteries all soldered together, and one pack goes out and I'm screwed. i complet...
by owhite
Aug 25 2020 8:26am
Forum: Battery Technology
Topic: Feedback for ebike battery build: 20s lithium polymer pouch
Replies: 13
Views: 582

Re: Feedback for ebike battery build: 20s lithium polymer pouch

Thanks for this information. My situation will be a bit more complicated. I am considering purchasing getting a total of something around 20 - 26 Ah, by using 10,000-13,000mAh packs in parallel. I just contacted Richard at rcbattery.com to see if he'd sell me individual 1s pouches that are used to c...
by owhite
Aug 24 2020 12:48pm
Forum: Battery Technology
Topic: Feedback for ebike battery build: 20s lithium polymer pouch
Replies: 13
Views: 582

Re: Feedback for ebike battery build: 20s lithium polymer pouch

Wow that performance data is incredible! Thanks a lot. That is really helpful. The other thing that I've been think should be possible is the idea using the JST balance plug of premade plugs to connect to a BMS. So for example, suppose I was using four, 6s premade packs in series to create a 100v, 2...
by owhite
Aug 23 2020 10:31am
Forum: Battery Technology
Topic: Feedback for ebike battery build: 20s lithium polymer pouch
Replies: 13
Views: 582

Feedback for ebike battery build: 20s lithium polymer pouch

Folks, i'm looking for feedback for on the upsides and downsides of pouch cells. The following is a summary of ratings for a number of pouch cells, and a comparison to two popular 18650 cells: https://i.imgur.com/2EAcuES.png The links for each row are posted below. So what I'm taking from this infor...
by owhite
Aug 23 2020 9:21am
Forum: EBike Technical
Topic: Feedback for ebike battery build: 20s 40ah lithium polymer pouch
Replies: 9
Views: 495

Re: Feedback for ebike battery build: 20s 40ah lithium polymer pouch

So, this thread doesnt seem to be gettin a lot of traction but I figured I'd post some more information. The following is a summary of ratings for a number of pouch cells, and a comparison to two popular 18650 cells: https://i.imgur.com/2EAcuES.png The links for each row are posted below. So what I'...
by owhite
Aug 20 2020 9:37pm
Forum: EBike Technical
Topic: Feedback for ebike battery build: 20s 40ah lithium polymer pouch
Replies: 9
Views: 495

Re: Feedback for ebike battery build: 20s 40ah lithium polymer pouch

are there more reliable sources for lithium pouch batteries? where does turnigy get them for their packs?
by owhite
Aug 20 2020 6:58pm
Forum: EBike Technical
Topic: Feedback for ebike battery build: 20s 40ah lithium polymer pouch
Replies: 9
Views: 495

Re: Feedback for ebike battery build: 20s 40ah lithium polymer pouch

Okay, might as well shout out some some additional information I've learned from looking around on endless-sphere. Searches using the keywords: "SPIM08hp" and "A123 Pouch Cell" and "SPIM08hp" has some useful hits on youtube. Right now I'm not drawn to the SPIM08hps beca...
by owhite
Aug 20 2020 1:28pm
Forum: EBike General Discussion
Topic: Identifying a motor: WP30039X
Replies: 33
Views: 1336

Re: Identifying a motor: WP30039X

Master Rhino,

I posted a comment here:
viewtopic.php?f=2&t=107873
about pouch cells and I'd be interested in your comments.

o