Search found 462 matches

by pwd
Mar 08 2021 4:16pm
Forum: Battery Technology
Topic: 36v jetson hoverboard battery
Replies: 1
Views: 21

Re: 36v jetson hoverboard battery

You *may* not want to use those packs again if the cells have dipped below a safe voltage of roughly 2.5V. The first thing I would do is check each cell groups voltage. A 36V Lithium Ion pack is usually made up of 10 cells in series, so there will be 10 groups to check. I cannot tell from the photo,...
by pwd
Mar 08 2021 8:40am
Forum: EBike Build Threads
Topic: PWD's Rocky Mountain Blizzard - mid drive
Replies: 36
Views: 5382

Re: PWD's Rocky Mountain Blizzard - mid drive

Thanks, it is my go to activity during the winter now. You are correct about needing the patch due to wear from a larger chainring. However, on top of that; I was having chain suck issues where the chain wouldn't let go of the chainring as is spun around. This caused the chain to grind up against th...
by pwd
Mar 07 2021 12:15pm
Forum: EBike Build Threads
Topic: PWD's Rocky Mountain Blizzard - mid drive
Replies: 36
Views: 5382

Re: PWD's Rocky Mountain Blizzard - mid drive

This bike has now over 3200km and is being ridden almost daily. I've learned the hard way that it is important to keep the drivetrain clean and well lubed especially in sticky/dirty/salty snow. IMG_20201222_090837.jpg IMG_20201222_090953.jpg Made patch with some aluminum plate and JB weld; which nee...
by pwd
Feb 28 2021 8:29am
Forum: Battery Technology
Topic: A question for any battery builders, DIY 72v 48ah 20S16P build.
Replies: 7
Views: 198

Re: A question for any battery builders, DIY 72v 48ah 20S16P build.

Take a look at this thread for the topic of "current sharing" : https://endless-sphere.com/forums/viewtopic.php?f=14&t=84412 I'm not sure how much current you plan on drawing from the pack but 16P has potential for some pretty high current. Some of the series connections only have 3 ce...
by pwd
Feb 26 2021 7:52pm
Forum: Items Wanted
Topic: 18650 Suppliers
Replies: 2
Views: 142

Re: 18650 Suppliers

Hi Terry,

if I was in the UK Id probably order from here: https://www.fogstar-wholesale.co.uk/
by pwd
Feb 25 2021 2:41pm
Forum: Items for Sale - Used
Topic: LiitoKala Lii-500S Charger / Tester - Canada only
Replies: 0
Views: 295

LiitoKala Lii-500S Charger / Tester - Canada only

I am only shipping to Canadian addresses. I have two LiitoKala Lii-500S units purchased in April 2020 these are used but in like new condition with original box and power supply $30 CAD each or both for $50 CAD, buyer pays shipping or pickup in North Bay, Ontario. I can give you a quote on shipping ...
by pwd
Feb 19 2021 5:59pm
Forum: EBike Non-hub Motor Drives
Topic: 'lightest.bike' 1.7kg 1000w mid drive
Replies: 89
Views: 11476

Re: 1.7kg 1000w mid drive

pwd wrote:
Feb 09 2021 11:24am
Just wondering if there have been any updates with this project and expected release schedules etc...?
Just found updates here: https://www.indiegogo.com/projects/ligh ... pdates/all
by pwd
Feb 18 2021 4:14pm
Forum: Battery Technology
Topic: First Battery Build 21700 Molicel P42A
Replies: 36
Views: 1103

Re: First Battery Build 21700 Molicel P42A

I've been wondering the same thing about measuring P42A's before assembling. The meter is a good idea but unfortunately the SM8124 seems to be unavailable, would you have any other recommendations for a meter? Does anyone use Allosun? Many available here (may take a while to ship from China): https...
by pwd
Feb 17 2021 1:33pm
Forum: Battery Technology
Topic: First Battery Build 21700 Molicel P42A
Replies: 36
Views: 1103

Re: First Battery Build 21700 Molicel P42A

Good to know about the SM8124 or similar. I will probably pick up something similar for my next pack build.
by pwd
Feb 16 2021 10:19am
Forum: Battery Technology
Topic: First Battery Build 21700 Molicel P42A
Replies: 36
Views: 1103

Re: First Battery Build 21700 Molicel P42A

It is good that you are testing each cell although they are new. I did the same when building my pack. The P42A may be what I use for my next pack. Have you considered the "per slot" deviation on those chargers? For example, I was using a couple of cell chargers similar to those but found ...
by pwd
Feb 15 2021 9:34am
Forum: Battery Technology
Topic: 40T cycle test
Replies: 29
Views: 2166

Re: 40T cycle test

Not sure if you've seen this but there is a new revision of the 40T cell labeled as the 40T3. https://cdn.shopify.com/s/files/1/0481/9678/0183/files/Samsung_Introduction_of_New_40T_v3.pdf?v=1612843210 From one of the comparisons in; it seems it may be slight better under freezing temps as well as so...
by pwd
Feb 09 2021 11:24am
Forum: EBike Non-hub Motor Drives
Topic: 'lightest.bike' 1.7kg 1000w mid drive
Replies: 89
Views: 11476

Re: 1.7kg 1000w mid drive

Just wondering if there have been any updates with this project and expected release schedules etc...?
by pwd
Feb 07 2021 4:28pm
Forum: EBike Non-hub Motor Drives
Topic: Cyclone BB size, I just dont understand
Replies: 8
Views: 373

Re: Cyclone BB size, I just dont understand

One thought I have is that the Cyclone BB spindle *may* be a tad longer than a stock BB spindle to allow a motor bracket to be fitted on each side between the bottom bracket shell and the threaded flange on the bottom bracket. Can anyone confirm that? Otherwise it also makes me wonder why replace th...
by pwd
Feb 07 2021 1:27pm
Forum: E-Vehicles General Discussion
Topic: Hub motor suddenly feels like a rubbing tyre..
Replies: 10
Views: 382

Re: Hub motor suddenly feels like a rubbing tyre..

If your motor has hall sensors, check the connector to make sure it is fully seated.
by pwd
Feb 07 2021 11:17am
Forum: EBike Non-hub Motor Drives
Topic: Cyclone BB size, I just dont understand
Replies: 8
Views: 373

Re: Cyclone BB size, I just dont understand

For reference here are the "bottom bracket" spindles available from Cyclone:
https://www.cyclone-tw.com/product/12/data/36

and a couple of others here:
http://sickbikeparts.com/bicycle-parts-and-tools/
by pwd
Jan 31 2021 9:03am
Forum: Battery Technology
Topic: Molicel P42a cycle test
Replies: 45
Views: 2109

Re: Molicel P42a cycle test

Thanks for the info, glad to hear that about 18650battery.com.
by pwd
Jan 31 2021 9:00am
Forum: EBike General Discussion
Topic: Durable 10 speed cassette and chain?
Replies: 21
Views: 413

Re: Durable 10 speed cassette and chain?

Nope, I was just going through my options, wanted to hear how robust 10speed cassettes and chains really are in real world usage. How much mileage you get out of those? These are rough figures but I'd say I get about 800km out of a chain (X10) before it reaches 0.5% wear and probably around 1800km ...
by pwd
Jan 30 2021 7:44pm
Forum: EBike General Discussion
Topic: Durable 10 speed cassette and chain?
Replies: 21
Views: 413

Re: Durable 10 speed cassette and chain?

The CSMS3 works pretty well for me on my 2kw mid-drive. I'm running a basic KMC X10 chain and it also works well. Are you looking for a cassette and chain that just doesn't wear out as fast or are you having breakage issues?
by pwd
Jan 30 2021 4:02pm
Forum: Battery Technology
Topic: Molicel P42a cycle test
Replies: 45
Views: 2109

Re: Molicel P42a cycle test

I was wondering if you'd mind sharing where you got your P42A cells from? I was going to do another 40T pack but they seem to be out of stock many places and the P42A would do nicely. The lowest price I can find (shipped to Canada) is https://www.bulkbattery.com/ Your cell testing is also appreciate...
by pwd
Jan 27 2021 11:08am
Forum: Battery Technology
Topic: Battery cooling question.
Replies: 8
Views: 345

Re: Battery cooling question.

No problem. Be careful though, 10-11A per cell *may* be more of an issue with your 18650 cells (unknown cells) if the internal resistance is higher (and likely is). The Samsung 40T is a larger 21700 cell.
by pwd
Jan 27 2021 10:30am
Forum: Battery Technology
Topic: Battery cooling question.
Replies: 8
Views: 345

Re: Battery cooling question.

It depends on the cells/BMS being used in the modals and how long you are pushing them to your controller's max current draw. On my ebike build for example, I'm using Samsung 40T cells that see maximum peaks of 20A per cell for periods of less than 30 seconds. Even on the hottest summer days here; I...
by pwd
Jan 21 2021 7:14pm
Forum: Battery Technology
Topic: Any Car Batteries You like?
Replies: 10
Views: 291

Re: Any Car Batteries You like?

I've had good success with Interstate MegaTron batteries. I've had two in two different vehicles one had over 12 years of service and the other went with the vehicle when I sold it (was at least 5 years old). Look for one with a replacement warranty if you are going through them that often.
by pwd
Jan 15 2021 2:02pm
Forum: Battery Technology
Topic: Battery Voltage
Replies: 3
Views: 176

Re: Battery Voltage

The charger output should measure 58.8V for 4.2V per cell on a 14S pack. Some charges (most of the generic ones) can be adjust via a trim potentiometer inside. For good lithium ion cell treatment though, 4.1V max per cell is recommended.
by pwd
Jan 15 2021 8:39am
Forum: EBike Technical
Topic: pedal assist sensor for press fit bottom bracket
Replies: 4
Views: 122

Re: pedal assist sensor for press fit bottom bracket

You might find this bottom bracket guide useful :viewtopic.php?f=28&t=80319