Search found 94 matches

by transposon
Mar 21 2020 11:35pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1558
Views: 217670

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Thanks for the input everyone. I think I am going to get the 1500W version in order to be able to pull some cargo. In order to get up and running, I think I am going to get one of the kits. I am confused on the top speeds listed for the kits. I assume they are are dependent on the winding, but of 2 ...
by transposon
Mar 20 2020 2:56pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1558
Views: 217670

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I am in the market for new hub motor and these leaf kits look pretty good. I am not sure what to get between the 1000W nd the 1500W. I plan on using a 26" wheel on an aluminim MTB. I am on the heavy side at 225lbs and would like to carry a bit of cargo from time to time so maybe 270lbs + bike weight...
by transposon
Mar 16 2020 12:32pm
Forum: E-Bike General Discussion
Topic: Hub motor is stuck
Replies: 10
Views: 405

Re: Hub motor is stuck

dogman dan wrote:
Mar 15 2020 8:23am
I'm betting its the freewheel jammed on the motor cover.
It was stuck without the freewheel as well.
by transposon
Mar 14 2020 6:36pm
Forum: E-Bike General Discussion
Topic: Hub motor is stuck
Replies: 10
Views: 405

Re: Hub motor is stuck

You sure you plugged back the phase in correct order ? Crossed phases / hall could explain a stuck motor. If you can even spin the wheel alone (no controller) it could be shorted phases. I cannot spin the motor either with or without the controller. The phase wires use a 9 pin connector that goes t...
by transposon
Mar 14 2020 5:09pm
Forum: E-Bike General Discussion
Topic: Hub motor is stuck
Replies: 10
Views: 405

Hub motor is stuck

So, my frustration with this generic rear hub motor continues. A few months ago after riding in the rain, the motor began to cut out rapidly, reducing my top speed to a jerky 10 mph. I let the motor and controller dry out for a few weeks and it began working again. Soon after that, the freewheel tha...
by transposon
Feb 18 2020 6:53pm
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 290
Views: 51137

Re: Common pack design mistakes, how to avoid?

Voltron wrote:
Nov 02 2019 5:20pm
Yes... More buss bars are better... Some just skip the strips and do full sheets. The only downsides are more materials and time costs, but for a boutique battery designed to be abused, worth it.

IMG_0576.JPG
IMG_0573.JPG
Voltron, where do you buy these nickel sheets?
by transposon
Feb 12 2020 10:17pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

Typically, cell "strips" are standardized, 6x might be 0.20? Keep same "strip" type in series! and use heavier parallel wires? If nearing cell output capability, might want to add "2" strip, but removing "6" strip - not recommended. According to my calipers, they are all 0.15mm in thickness. Why wo...
by transposon
Feb 09 2020 7:38pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

After opening up a few packs, for the series connections, some of the packs use 6x0.15 strip while others use 8x0.15 strip.

Would this make it necessary to pull off and reweld all of the strip so that they all match in cross section/current capability?
by transposon
Feb 09 2020 5:19pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

I am thinking of making a 14s6p 25r pack. My controller is a 26A KT controller. I am assuming 30A max on starts and steep hills. If my math is correct, 30A / 6p = 5A per series string. I took out my calipers and measured the nickel strip. 6x0.15mm. Should I be concerned about the current capacity of...
by transposon
Feb 05 2020 3:24pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1676
Views: 497458

Re: Homemade Battery Packs

I'm glad to hear that you are safe and that we will continue to get your posts in the forum.
by transposon
Feb 04 2020 11:52pm
Forum: E-Bike General Discussion
Topic: New line of budget in-frame triangle bags
Replies: 9
Views: 1710

Re: New line of budget in-frame triangle bags

I was thinking of a 14s 12p or 168 cells without a BMS. Hmm. Seems like it may be a very close call.

Are there any larger options available for quality triangle bags?
by transposon
Feb 04 2020 11:46pm
Forum: E-Bike General Discussion
Topic: NESE cell holders
Replies: 3
Views: 539

Re: NESE cell holders

I had the same concern. I ordered a set thinking there would be connectors on either side of the metal strips, as some photos (for apparently a different product on the website) showed dual connection points. I ordered a full set, printed the enclosures, and now am unsure what to do with everything....
by transposon
Jan 27 2020 5:53pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

Ah, I think I understand now. Thank you.

Is there any guideline on whether or not the nickel strips used in the already assembled packs are adequate for a specific current?

I plan on pulling ~30A peak / ~15A continuous and am not positive the welded strip is up to the task.
by transposon
Jan 26 2020 10:00pm
Forum: E-Bike Technical
Topic: Controller for 52-60V system
Replies: 17
Views: 1072

Re: Controller for 52-60V system

I took a look at the caps in my current controller. They are 63V. Is bumping up the voltage capability of the controller to 67V just a matter of replacing the caps?
by transposon
Jan 24 2020 6:08pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3924
Views: 347726

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

I was thinking of flashing the firmware onto this controller: KT48ZWSRLT-LCD 48V controller with LCD5. Any idea if this controller would work? I think it may be the kind without phase current sensing, but I am not sure.

Thanks!
by transposon
Jan 23 2020 5:12pm
Forum: E-Bike Technical
Topic: Controller for 52-60V system
Replies: 17
Views: 1072

Re: Controller for 52-60V system

Well, that's without the display. There's a Grin 40A programmable sine wave controller that I was considering when I was shopping for a controller with a flexible voltage input. https://www.ebikes.ca/shop/electric-bicycle-parts/controllers/c7240-l10.html I ended up with a Powervelocity controller, ...
by transposon
Jan 23 2020 9:50am
Forum: E-Bike Technical
Topic: Controller for 52-60V system
Replies: 17
Views: 1072

Re: Controller for 52-60V system

That $300 price tag is a bit too high for me right now.
by transposon
Jan 21 2020 5:17pm
Forum: E-Bike Technical
Topic: Controller for 52-60V system
Replies: 17
Views: 1072

Controller for 52-60V system

I am building a couple of new battery packs. Since my cells are coming in 4S1P units, I am thinking of going with a 16S (rather than 14S) battery for ease of construction. This would mean that I will have 12S, 14S, and 16S packs. Is there a controller that can work with all these voltages? Ideally, ...
by transposon
Jan 18 2020 11:51am
Forum: E-Bike General Discussion
Topic: New line of budget in-frame triangle bags
Replies: 9
Views: 1710

Re: New line of budget in-frame triangle bags

I considered the Ibera bag as a possibility for my 17s10p 18650 triangle battery build. I did not think the three thin velcro straps on the Ibera bag would support a 20+lb battery with all the jostling from the ride, so I opted for the EM3EV bag. It is only $35 US and has 8 thick heavy duty velcro ...
by transposon
Jan 17 2020 2:23pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

I am having a hard time visualizing how the layout would work. It seems like you would need a separate BMS for each series string to make sure they are balanced.
by transposon
Jan 17 2020 12:58am
Forum: Battery Technology
Topic: LiitoKala Lii-500 charger restarting at 1a charge
Replies: 3
Views: 367

Re: LiitoKala Lii-500 charger restarting at 1a charge

I had the exact same problem about a year ago. It would be fine if I was charging < 4 cells at 1A but at 4 cells, it would reboot. It was especially frustrating because I was using it for capacity testing, so once all 4 cells were fully discharged, they would begin to charge and I would loose the ca...
by transposon
Jan 16 2020 11:22am
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

Good point on the BMSs. Thanks. I have a hobby charger that can measure total IR for a pack as well as individual cell IR within a pack. I think I will use that to check all of the resistances while the packs are intact. I don't understand how I can build the pack correctly without separating the pa...
by transposon
Jan 14 2020 11:52am
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Re: Thoughts on this battery harvesting scenario?

Thanks for the input DrkAngel. The packs already have a BMS installed on each to keep them balanced during charging. Would this change your strategy? If I am reading this correctly, you say to keep them connected for testing. What about when it's time to build the pack? Should I split them up then?
by transposon
Jan 13 2020 10:01pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1710

Thoughts on this battery harvesting scenario?

So, I was the lucky purchaser of a lot of 4s1p Panasonic 25R battery packs that should have received little use. I would like to use these to build a large ebike pack - 14 or 16s and 6-8P. From what I have read, creating parallel groups first and then putting them in series is the way to go. Unfortu...
by transposon
Dec 17 2019 10:46am
Forum: E-Bike General Discussion
Topic: Reliable throttle and controller options
Replies: 3
Views: 664

Re: Reliable throttle and controller options

Thanks for the reply Dogman,

When you refer to the cheap controllers, are you talking the KT type of controller? This is the variety that came in my DIY kit. Do you know of a good place to buy one of the cheapos?