Search found 112 matches

by Username1
Mar 06 2021 9:16pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

That's good to hear that it only refers to the set voltage (CV phase). I didn't realize it was a 3 phase input. I guess that's what it meant by "3 ψ" . I know 3 phase is industrial so looks like i won't be using this power supply. So looking at Mean Well's other power supplies, it seems th...
by Username1
Mar 06 2021 5:19am
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

It's been a while since i put this on the back burner, but I've returned to it. I'm wondering would the power supply linked below be suitable for charging these cells? The reason I ask is because the voltage has a narrow field, and doesn't go to 0 like other switching power supplies I've seen. For e...
by Username1
Mar 03 2021 6:01am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1577
Views: 177031

Re: Nucular electronics - complete kit for ev! [beta]

I hope it's not a dumb question but... I see you can charge through the controller. The 24F says up to 10kw continuous and 300 battery amps. Does this mean it's possible to charge using 10kw (or close to that)? For example using 250+ amps for a 36v system, or would it cause problems for the controll...
by Username1
May 15 2020 10:42pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

I believe this test was talking about charge absorbed without the CV phase, meaning fast charging with a constant current until the maximum voltage was reached then stopping. Should have made that more clear. I'm just trying to say it looks like it could be ≥90% at 6c, which i would be quite happy w...
by Username1
May 15 2020 9:34pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

Been gathering some more information on these cells... It appears that the larger version (66260 60ah) may no longer be in production. This size appears for sale much less often, and i haven't found any actual 60ah cells (just 55ah probably implying old/used stock). I was originally considering this...
by Username1
May 13 2020 10:56pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

I know that stopping the charge at the cc/cv transition point is somewhat arbitrary, but that's the point where it begins going progressively slower, and 80% at full speed is enough for me. So i can call that "fully charged" for my purposes. I'm not sure how many cycles this will last at 6...
by Username1
May 13 2020 9:28pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

First reason is just because i want to. It's really cool and useful to charge an ebike in 6-10 minutes (and still have it last 10k+ charges). Secondly this ebike will be used heavily, and instead of fitting a massive conventional battery (which could also go empty and need a long recharge), i have t...
by Username1
May 13 2020 9:02pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

Sorry if I forgot, but why are you in **that** much of a hurry? I'm not in a huge hurry, i just have a clear goal in mind. I want max charge speed on LTO and i'v been extensively researching what parts to use. I think i'v pretty much sourced everything i need now. I think you'll find that 10C rate ...
by Username1
May 13 2020 7:31pm
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

After much research and thinking, i'v decided on 10 x 40ah cylindrical cells (960wh). They will be made into 2 x 5s packs which are charged separately (12v), but discharged in series (24v). I'v found a proper CC/CV 400a adjustable power supply for a good price. This works well because i'v since real...
by Username1
May 11 2020 12:07am
Forum: EBike Technical
Topic: Unloaded vs Loaded Speed?
Replies: 22
Views: 962

Re: Unloaded vs Loaded Speed?

So is there any efficiency penalty for selecting a kv that's way higher than you need? For example if your top speed was only 50% of the kv, limited using either the controller or just manual throttle control.
by Username1
May 09 2020 10:25pm
Forum: EBike Technical
Topic: Unloaded vs Loaded Speed?
Replies: 22
Views: 962

Re: Unloaded vs Loaded Speed?

I know 5s is a better "12v" match, but surely that doesn't matter as long as i''m not exceeding a controllers limit with my extra few volts. It seems like a 2T leaf motor matches perfectly with 20mph on 6S. I"m happy to use that motor because of it's good efficiency which helps offset...
by Username1
May 09 2020 1:56pm
Forum: EBike Technical
Topic: Unloaded vs Loaded Speed?
Replies: 22
Views: 962

Re: Unloaded vs Loaded Speed?

Thanks for the replies. So if my desired top speed is 20% below my kv, that should basically guarantee i can actually reach the top speed, and operate near peak efficiency? This is the specific example i'm looking at doing... I want to use a large 6s LTO battery to go 20mph on 20 inch wheels. I want...
by Username1
May 08 2020 10:38pm
Forum: EBike Technical
Topic: Unloaded vs Loaded Speed?
Replies: 22
Views: 962

Unloaded vs Loaded Speed?

I know that KV is the unloaded rpm/volt. But what about when you are riding? Does kv accurately represent your top speed when taking the wheel size into account? (dd hub motor) Or is the top speed actually less than the kv would suggest?
by Username1
May 05 2020 9:10pm
Forum: Motor Technology
Topic: Homopolar Switched Reluctance Motor
Replies: 15
Views: 1993

Re: Homopolar Switched Reluctance Motor

https://anofol.de/en/products/anodised-aluminium-strips-and-foils/ Here's a company i found that makes anodized aluminum strips for electrical purposes like this. Their website has lots of information about the claimed advantages. If you scroll down, their technical details link explains everything ...
by Username1
Apr 30 2020 4:22am
Forum: Motor Technology
Topic: Homopolar Switched Reluctance Motor
Replies: 15
Views: 1993

Re: Homopolar Switched Reluctance Motor

Being 2 pole too makes me think of torque ripple too, something thats a common issue with SRMS, so its likely to be a noisy motor too? particularly when its so easy to add a 3rd (or more) phase to the motor to smooth it out, just copy paste a single phase in parallel, seems they are sticking with a...
by Username1
Apr 28 2020 5:50am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1577
Views: 177031

Re: Nucular electronics - complete kit for ev! [beta]

Ok great. One more question, do you think the waiting time on the website of 4 months is still accurate, or could it be delayed longer from the virus? I just found this project so i'm not informed on these things.
by Username1
Apr 28 2020 5:01am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1577
Views: 177031

Re: Nucular electronics - complete kit for ev! [beta]

Can this controller work well for a 24v battery? I see the voltage range is 20-90. Will it still work perfectly even if i drain my battery to the 20v limit? These are high power batteries, so i may use the full 300a at times.
by Username1
Apr 28 2020 4:48am
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 702

Re: Low Power, High Regen?

Since you own that controller, maybe you can answer a question for me... It says the voltage range is from 20-90. I'm currently thinking about doing a 24v battery with a low turn motor for 20mph top speed. I wasn't planning to drain the battery below 20v anyway, so you you think this controller woul...
by Username1
Apr 28 2020 2:49am
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 702

Re: Low Power, High Regen?

I won't be replacing the mechanical brakes. Just not using them most of the time. I was already planning to not charge the battery to 100% so no problem there. That Nucular controller looks awesome. It has everything i need and the top version supports 300a. It's not even crazy expensive. Hopefully ...
by Username1
Apr 27 2020 9:21pm
Forum: EBike General Discussion
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 2003
Views: 261166

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

Is the 1500w available with 3t winding? How can i check the top speed in various voltages, i only see the 5t in the simulator.
by Username1
Apr 27 2020 5:45pm
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 702

Re: Low Power, High Regen?

Also note that the controller has to boost motor voltage above pack voltage, to feed current back into the pack. As the motor slows to a stop, it becomes increasingly difficult to extract that braking power and convert to electricity. So regen effectivness is reduced at very low speeds. Some contro...
by Username1
Apr 26 2020 5:03pm
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 702

Re: Low Power, High Regen?

You seem to think i'm expecting massive energy gains. Not the case. The main reason is like you said, to negate wear on the brakes. But it's also the case that a heavy, wide tire, 10c charging capable ebike is perfectly suited to take advantage of regen energy. I could just get a 30 amp controller (...
by Username1
Apr 26 2020 4:50pm
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 702

Re: Low Power, High Regen?

I hope you don't think activating brakes unnecessarily will be a net gain? 8-D Of course not. Why do you still think that? For the umpteenth time, carrying around a lot of extra weight means you need to use **more** power. I never said more weight doesn't use more power, of course it does. I'm sayi...
by Username1
Apr 26 2020 11:16am
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 702

Re: Low Power, High Regen?

No i don't have the cells, i'm just interested in using this chemistry due to it's characteristics. The AH of the cells are relevant, because these are massive 40ah cells that cannot be paralled due to lack of space. And i mention their capacity because of regen braking... I was under the impression...
by Username1
Apr 26 2020 9:32am
Forum: Battery Technology
Topic: Charging LTO at Max Speed?
Replies: 118
Views: 8583

Re: Charging LTO at Max Speed?

Sorry to keep repeating, but forget the focus on the super fast charging aspect for now, prep all your infrastructure to withstand it, but get everything else solved using a 0.1-0.2C rate first. Will do. I actually think that's the more accurate way to describe the charger hardware . The charger is...