Search found 88 matches

by transposon
Feb 12 2020 10:17pm
Forum: Battery Technology
Topic: Thoughts on this battery harvesting scenario?
Replies: 16
Views: 1328

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: 1328

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: 1328

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: 481184

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: 1471

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: 327

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: 1328

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: 819

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: 3810
Views: 323219

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: 819

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: 819

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: 819

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: 1471

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: 1328

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: 2
Views: 230

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: 1328

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: 1328

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: 1328

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: 609

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?
by transposon
Dec 16 2019 7:48pm
Forum: E-Bike General Discussion
Topic: Reliable throttle and controller options
Replies: 3
Views: 609

Reliable throttle and controller options

I am considering a long distance, multi-day ebike trip once it warms up a bit. I am looking for reliable options for throttles and controllers. They don't need to be top of the line because I plan on carrying spares, I just want to reduce my chances of needing to use the spares. I searched, but didn...
by transposon
Dec 16 2019 6:30pm
Forum: E-Bike Technical
Topic: Motor stopped working, need some help.
Replies: 12
Views: 814

Re: Motor stopped working, need some help.

In your initial problem report you notice that the problem increased over time, presumably a single ride. Roughly how long was this, minutes, hours, continuous ride or a stop in the middle? Also, was it continuously raining or did the problem continue to get worse after the rain stopped, if so, for...
by transposon
Dec 15 2019 6:58pm
Forum: E-Bike Technical
Topic: Motor stopped working, need some help.
Replies: 12
Views: 814

Re: Motor stopped working, need some help.

Do throttles commonly fail? Is it a good idea to have a spare on hand? I may just order another if it is a part that will likely need replacement soon anyway.
by transposon
Dec 15 2019 6:47pm
Forum: E-Bike Technical
Topic: Motor stopped working, need some help.
Replies: 12
Views: 814

Re: Motor stopped working, need some help.

The controller was in a triangle bag that does tend to collect a small amount of water. The bottom of the bag was wet to the touch when the issues began. I was also not using fenders, so a small amount of water and salt spray may have reached the controller through the inch or 2 of open zipper on th...
by transposon
Dec 14 2019 1:33am
Forum: E-Bike Technical
Topic: Motor stopped working, need some help.
Replies: 12
Views: 814

Motor stopped working, need some help.

While riding in the rain, my motor began to cut out and then start up again with no change to the throttle. The periods of no power became longer and longer to where now the motor is off more than it is on. I wasn't able to go above 10 mph. Here are my specs: 1000W DD generic rear hub motor KT LCD 5...