Search found 37 matches

by nickceouk
May 22 2020 4:19pm
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 6
Views: 200

Re: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

It seems that To(Texas instruments) have interesting GaN charging reference designs.

I am guessing that some of them can be used or adapted for a nice 99% efficient, lightweight and portable charger.

Would appreciate any comments
by nickceouk
May 21 2020 1:34pm
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 6
Views: 200

Re: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

Option 3) Can some of the hub controller circuitry be reused to charge the battery. Let's say I unplug the hub motor leads and plug AC 230v to another connector on the controller...It's all linked up to the battery anyway :wink: As far as I understand the GaN stuff is used as a first stage from AC T...
by nickceouk
May 21 2020 12:47pm
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 6
Views: 200

Re: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

Here is one 100watt compact GaN charger https://cdn.vox-cdn.com/thumbor/nz4_cVnSm04kvQ0hGISUbmfsbMc=/1400x1400/filters:format(jpeg)/cdn.vox-cdn.com/uploads/chorus_asset/file/19367168/100W_GaN_Charger__vs_credit_card_showing_ports_.jpg https://cdn.shopify.com/s/files/1/0872/6416/files/41c9a7f2f9eb303...
by nickceouk
May 21 2020 12:30pm
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 6
Views: 200

Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

I plan on E-Bike Touring and need to keep weight to a minimum. I will be carrying AC charger with me to top up where possible. Everything that can be made lighter is welcome and hence focusing on the charger. Two Batteries is 14s each. At the moment I use 2x 58.8v 4amps brick chargers either in para...
by nickceouk
Feb 03 2020 11:49pm
Forum: E-Bike General Discussion
Topic: New Gallium(GaN) chargers -any tangible benefit to ebike battery charging?
Replies: 3
Views: 331

Re: New Gallium(GaN) chargers -any tangible benefit to ebike battery charging?

There are other things like reference designs for GaN rectifier but 54.6v are not to be found :roll: Eltek Flatpack SHE have GaN transistors and achieve almost 98%. https://www.eltek.com/globalassets/media/downloads/brochures/she_brochure.pdf I checked the Eltek Flat pack SHE against the Huawei R48...
by nickceouk
Feb 03 2020 12:02pm
Forum: E-Bike General Discussion
Topic: New Gallium(GaN) chargers -any tangible benefit to ebike battery charging?
Replies: 3
Views: 331

New Gallium(GaN) chargers -any tangible benefit to ebike battery charging?

The newer GaN wall chargers have been making rounds at CES 2020. The question I have is if there are any clear benefits to be had for portable ebike charging - 13s - 54.6v DC. 99% efficiency is what these things advertise ...how does this compare with standard brick charger used before GaN - weight ...
by nickceouk
Feb 03 2020 9:48am
Forum: Items for Sale - New
Topic: 20Ah li-on NMC cells UK London new boxed £10 each on box of 50 limited stock
Replies: 101
Views: 12669

Re: 20Ah li-on NMC cells UK London new boxed £9 each on 50

Used the cells I bought from James today and they performed very good indeed.
The voltage drop I experienced(ebike) with other chemistry cells was much less noticeable with these.

:thumb:
by nickceouk
Feb 03 2020 9:40am
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Ride a folding bike long distance? Nope! ... and Street AC/DC recharging in 40mins ... As to 25kg+ battery it's not a deal breaker on its own ... 25kg (by the time it's built into a sturdy pack you're looking at ~30kg) on a bike frame is a lot. Before commiting to something like that I really would...
by nickceouk
Feb 03 2020 9:40am
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Ride a folding bike long distance? Nope! ... and Street AC/DC recharging in 40mins ... As to 25kg+ battery it's not a deal breaker on its own ... 25kg (by the time it's built into a sturdy pack you're looking at ~30kg) on a bike frame is a lot. Before commiting to something like that I really would...
by nickceouk
Jan 25 2020 10:31am
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

AW is right you live in the UK I would buy those eig cells in a heartbeat. They look easy to bolt together I got 13 cells off James to test today. Come well packaged and from a new stack of 50. Female terminals are M3 size from what I found and I also ordered copper rivets to then thread myself wit...
by nickceouk
Jan 23 2020 3:19pm
Forum: Items for Sale - New
Topic: 20Ah li-on NMC cells UK London new boxed £10 each on box of 50 limited stock
Replies: 101
Views: 12669

Re: 20Ah li-on NMC cells UK London new boxed £9 each on 50

amberwolf wrote:
Jan 23 2020 2:06pm
nickceouk wrote:
Jan 23 2020 8:33am
Not sure if the pm I sent you works as it s in Outbox and not going to Sent :?
viewtopic.php?f=13&t=15521
Thanks :D
by nickceouk
Jan 23 2020 8:33am
Forum: Items for Sale - New
Topic: 20Ah li-on NMC cells UK London new boxed £10 each on box of 50 limited stock
Replies: 101
Views: 12669

Re: 20Ah li-on NMC cells UK London new boxed £9 each on 50

Not sure if the pm I sent you works as it s in Outbox and not going to Sent :?

Can I do a local London pickup - 14 cells ? Pm me how with details - can do same day too.
by nickceouk
Jan 22 2020 6:31pm
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Had to recheck on the 30 min charge - 20ah cells charged at 10a(0.5c as per spec) would actually take 2 hours right? yeah, sorry, i'm still exhausted from nightmares (from peanutbutters' death three weeks ago), so math is not my friend right now (actually, it never is, but especially now). I would ...
by nickceouk
Jan 22 2020 5:32pm
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

just some stuff to run by you, as food for thought: if those are like most of the nmc cells i've seen / used, they'll only have a 0.5c charging rate, meaning it will take about 30 minutes to charge to mostly full, with the appropriate charger. probably about 45-50 minutes for "really full", assumin...
by nickceouk
Jan 22 2020 4:25pm
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

I have a 24s A123 20ah pouch cells charge as 2 12s with mean well 24v turned to 28.8v and a 12.6v HP 550 power supply times two. This is the limit for my garage outlet. Any more juice it will trip breaker. I think 42.3v @ 14mps each in 50 min. For 6.5 years 1,480 cycles 24,00 miles still going stro...
by nickceouk
Jan 22 2020 3:37pm
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Zesty 240vdc 400amps to my folding bikes 🔋 for a 15 min charge.how long do you think it takes you to run into circle k and get a coffee and donut ? Can you say floating plasma ball. Small mushroom cloud and a flying folder. I am laughing with you on this one :lol: :lol: :lol: 2160 wh NMC battery + ...
by nickceouk
Jan 22 2020 3:26pm
Forum: E-Bike General Discussion
Topic: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...
Replies: 21
Views: 1557

Re: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...

It strikes me that more than 3 phases may or may not benefit towards my goal. What did you have in mind? This was a directed at hub motor design. No specifics unfortunately Interesting. Can you post a link with more info on a hub motor with more than 3 phases? Curious about how that works. There is...
by nickceouk
Jan 21 2020 3:29pm
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Ride a folding bike long distance? Nope! ... and Street AC/DC recharging in 40mins ... As to 25kg+ battery it's not a deal breaker on its own ... 25kg (by the time it's built into a sturdy pack you're looking at ~30kg) on a bike frame is a lot. Before commiting to something like that I really would...
by nickceouk
Jan 21 2020 3:01pm
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Glad to hear you're getting realistic, dropping the 10-min charging in this case. If the light weight and folding portability is important, start out with say a pair of packs mounted so they're easy to swap out. Then after you've logged a few thousand miles, got all the other issues sorted, you'll ...
by nickceouk
Jan 21 2020 11:19am
Forum: E-Bike General Discussion
Topic: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...
Replies: 21
Views: 1557

Re: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...

Re charging in the wild, unfortunately my town pretty much locked up all the plugs in city parks and such, preventing no hassle charging on the go. It definitely makes sense to be capable of using a tesla charge station if you have them, using some kind of converter down to a reasonable bike voltag...
by nickceouk
Jan 21 2020 11:07am
Forum: E-Bike General Discussion
Topic: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...
Replies: 21
Views: 1557

Re: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...

If we're gonna play silly buggers with lethal voltages of electricity, you REALLY gotta work hard to find a novel way to die. Assumptions - OP has said he wants around 3kwh of battery at 48-72 volts, totaling 3kw, that can be charged in 10 minutes, without massive chargers, and using off the shelf ...
by nickceouk
Jan 21 2020 10:45am
Forum: E-Bike General Discussion
Topic: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...
Replies: 21
Views: 1557

Re: Hub motor on 240v DC ebike? Controller(MOSFETs), windings(phases)...

E-HP wrote:
Jan 21 2020 3:22am
nickceouk wrote:
Jan 20 2020 4:21pm

It strikes me that more than 3 phases may or may not benefit towards my goal.


What did you have in mind?
This was a directed at hub motor design.
No specifics unfortunately
by nickceouk
Jan 21 2020 10:01am
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

I get nothing on eBay when I search with the above number or the number in your previous post. Maybe because you're trying on a Euro site rather than eBay.com? https://www.ebay.com/sch/i.html?_nkw=124046844135&_trksid=m5467.l1311 https://www.ebay.com/sch/i.html?_nkw=143034247371&_trksid=m5467.l1311...
by nickceouk
Jan 21 2020 9:51am
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

Ride a folding bike with a 25kg+ battery? Nope! Ride a folding bike long distance? Nope! 10min charge (6C) can be achieved on LiCO cells - just look at the RC world. Not all foldable bikes are flimsy and feeble : https://i.redd.it/dgktsm2ohom31.jpg https://o.aolcdn.com/images/dims?resize=2000%2C200...
by nickceouk
Jan 21 2020 2:22am
Forum: Battery Technology
Topic: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver
Replies: 65
Views: 4087

Re: Practical advice on achieving the 10min full charge LTO(Titanate) cells are meant to deliver

john61ct wrote:
Jan 20 2020 8:45pm
Also # 124046844135
I get nothing on eBay when I search with the above number or the number in your previous post.