Search found 7758 matches

by Chalo
May 18 2021 5:01pm
Forum: EBike Technical
Topic: I Am Buying A Kit For My Trike
Replies: 4
Views: 63

Re: I Am Buying A Kit For My Trike

Will 48 volts and 20 amps get me 40-45 miles on a trike. I weigh 170 pounds. Is their any advantage to getting 52 volts and 20 amps? That's about 1 kWh, and it could easily carry you 40 miles (or not) depending on your trike's configuration, your local terrain, and how many stops and starts you hav...
by Chalo
May 18 2021 12:33pm
Forum: EBike Troubleshooting
Topic: Controller overheating! Could it be wrong phase/hall combo?
Replies: 3
Views: 48

Re: Controller overheating! Could it be wrong phase/hall combo?

The only incorrect Hall/phase wire combination that works at all, spins much too fast and with very low torque. If that's not the behavior you were getting, then that's not the problem.
by Chalo
May 18 2021 12:09pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1676
Views: 270002

Re: Thread for new battery breakthrough PR releases

Aluminum-air batteries have been promising tech since the '80s, but they're non-rechargeable. The idea is they're "reloadable" with fresh aluminum plates. I doubt that anyone would want to advance that kind of technology for EVs today. I hope that's not what this new battery development is...
by Chalo
May 18 2021 11:01am
Forum: EBike Technical
Topic: kids bike: minimal assist lightweight pedelec option?
Replies: 5
Views: 158

Re: kids bike: minimal assist lightweight pedelec option?

https://bmsbattery.com/ebike/568-16163-q75-36v200w-front-v-brake-e-bike-kit-with-lcd-display-ebike-kit.html The hub motor weighs only 1.2kg. If the kit won't run without the throttle plugged in (like some I've set up), then tuck the throttle into the battery bag. Alternately, you could get the hub o...
by Chalo
May 18 2021 10:39am
Forum: EBike Technical
Topic: I Am Buying A Kit For My Trike
Replies: 4
Views: 63

Re: I Am Buying A Kit For My Trike

Miami Sun Trike. I want 20 mph, slightly plus. I may never ride it that fast, but I want it available. I've worked on a whole lot of trikes, and believe me when I tell you-- you really don't want to go that fast, ever, on a granny trike. They get very treacherous and you will hurt yourself. Your He...
by Chalo
May 18 2021 2:41am
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

Well, keep in mind that dragging a trailer costs energy, so that big expensive mass of batteries won't get you as much extra range as its kWh capacity would otherwise suggest. It's all fine until your batteries give up 50 km from your destination, and you're left pedaling a 120 kg rig. If the recomm...
by Chalo
May 18 2021 1:34am
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

The OP's question isn't about a bike; it's a trailer. Yes but it is more like cargo trailer than a camper! I am intending to carry additional weight on the trailer. Recommended max weight for the trailer is 25kg. Oh dear. :lol: There's no way for you to install 48V x 100Ah of any kind of battery an...
by Chalo
May 18 2021 1:02am
Forum: EBike Technical
Topic: 48v Battery with 60v e-motor.
Replies: 4
Views: 183

Re: 48v Battery with 60v e-motor.

Motors don't have a specific voltage; they have a specific RPM per volt. If your controller is happy with 48V, and your motor can accept all the current your controller can send it, then everything is fine.
by Chalo
May 17 2021 10:50pm
Forum: EScooters/EMotorcycles
Topic: Compleate noob
Replies: 2
Views: 48

Re: Compleate noob

Having to cut power to restore the bike's function is characteristic of the BMS doing what it's supposed to do. You probably have a weak cell group that drops enough under load for the BMS to say "nope", but you keep waking it back up and continuing to beat on it anyway. If you can probe y...
by Chalo
May 17 2021 5:04pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

My only vape cell packs were commercial ones from Luna, but they became troublesome. All my larger format packs have been homemade by me, and have been reliable. Make of that what you will. I think 18650s for high energy packs are silly not only because of the huge numbers required, but because you ...
by Chalo
May 17 2021 3:38pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

I already did the math for you using cells that compare more relevantly to each other. no, you picked and choose the cells that to fit your narrative and you failed. and there are 50+ cells in a regular ebike battery. they seem to work just fine on a bike. even ignoring the 8000+ in a tesla.... I t...
by Chalo
May 17 2021 3:14pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

Anyway, making a multi-kWh pack out of vape pen cells is silly. tell that to tesla. you are being dumb. they are not even vape cells. Okay, flashlight cells. Whatever. Something you need 400 to 600 of to make the OP's desired pack. And sure, you can compare a limited power, limited life portable de...
by Chalo
May 17 2021 2:40pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

I don't know what rationale you base your assertions on. Maybe you assume the use of a bike that isn't competent to carry weight? 120lbs on lifepo versus 40-ish lbs on 18650's is QUITE the difference, especially on a bike, trailer or not. its a LOT of dead weight to be dragging along. even ignoring...
by Chalo
May 17 2021 2:19pm
Forum: Electric Watercraft
Topic: Canoe powered trailer/mobility device.
Replies: 4
Views: 68

Re: Canoe powered trailer/mobility device.

I don't think stretchy belts are going to do what you want. Better plan on using a gang of them on each tire if you go that way.
by Chalo
May 17 2021 2:16pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

100ah 3.7v Lipo pouch cell looks very attractive being 1/10th weight of the LIFEPO4 cells. 10000mah 25C:10564155,Dimensions is Thickness x Width x Length =10.5x64x155mm,weight:196g That's 10 Ah, not 100. So the weight sort of makes sense. 37 Wh / 0.196 kg = 189 Wh/kg As opposed to A123 AMP20 LiFePO...
by Chalo
May 17 2021 2:03pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

recommending lifepo on a bike is just flat out bad advice. especailly with a $15 bms. The OP's question isn't about a bike; it's a trailer. I used a briefcase-sized LiFePO4 pack on my cargo bike for a while (made of old low performing cells), and it was fine. It gave me more range than my NMC prism...
by Chalo
May 17 2021 1:46pm
Forum: Electric Watercraft
Topic: Canoe powered trailer/mobility device.
Replies: 4
Views: 68

Re: Canoe powered trailer/mobility device.

slomobile wrote:
May 17 2021 1:27pm
I wrote this up today because I am about to call up belt suppliers to see what belts are appropriately high tension, abrasion resistant, yet high friction enough to be driven on 2" pulleys with <180 degree wrap.
I'd start by looking at 8mm pitch toothed belts and sprockets.
by Chalo
May 17 2021 1:30am
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 31
Views: 360

Re: Building a large capacity battery for bicycle trailer

If you use 18650 cells, you're looking at a pack of 400 to 600 cells. It doesn't make any sense; there are too many opportunities to have a faulty connection. If you really want a 5 kWh pack (which will be big, heavy, and expensive), then you should probably be looking at prismatic cells in the Ah r...
by Chalo
May 16 2021 6:42pm
Forum: EScooters/EMotorcycles
Topic: Undervolting.. how much topspeed would i loose?
Replies: 7
Views: 154

Re: Undervolting.. how much topspeed would i loose?

It’s linear, you’ll lose 10% top speed. No other effects like poor efficiency. Why switch to lower voltage? I’d buy a new 20s battery. The difference in real world top speed will be a little less than that, because the power required to maintain a certain speed diminishes faster than the speed does...
by Chalo
May 16 2021 4:09pm
Forum: EBike General Discussion
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1974
Views: 256464

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

For electric motors "low performance" often means fault tolerant and reliable, something that won't burn up as soon as it departs its intended operating envelope. It's worth giving up a lot of power density in exchange for something that always works.
by Chalo
May 16 2021 11:42am
Forum: E-Vehicles General Discussion
Topic: Aptera is gone for good. :'(
Replies: 120
Views: 13347

Re: Aptera is gone for good. :'(

TrotterBob wrote:
May 16 2021 2:39am
Um... thanks Hillhater? I see a window and a play button in your post but its giving me an error message.
Trim away the URL except for the specific video code. In your case, kIyJ2BmHPQI is the text you need to embed the video.

by Chalo
May 16 2021 12:47am
Forum: Motor Technology
Topic: Hub motor rewinding, what thickness of enamelled copper wire?
Replies: 67
Views: 1841

Re: ....................................

Yes, having needless offspring can drive you to your wits' end. Nonetheless, it seems like a good example of your problem, not ours.
by Chalo
May 16 2021 12:30am
Forum: EBike General Discussion
Topic: Gadgets on your eBike that you couldn't live without
Replies: 74
Views: 4622

Re: Gadgets on your eBike that you couldn't live without

As for me, I need a basket. My cargo e-bike has an 18 gallon, frame mounted front "basket" (tote bin) that carries 100 pounds (and more) often. My ho-hum e-bike has the biggest plastic front bike basket I could find, zip tied to the front of the BMX bars. It feels really confining sometime...
by Chalo
May 16 2021 12:18am
Forum: EBike Technical
Topic: Building Electric Moped. Battery Questions
Replies: 19
Views: 301

Re: Building Electric Moped. Battery Questions

Enduro frame. https://imgur.com/a/ljLWAGv It says it has a drop out of 155mm. So I'm thinking the maximum I will ever need to go as a registered motorcycle is 50MPH So any motor that could do that and I guess for the time being I can just limit it to meet UK regulations for a moped and then once I ...
by Chalo
May 15 2021 7:37pm
Forum: EBike Technical
Topic: Building Electric Moped. Battery Questions
Replies: 19
Views: 301

Re: Building Electric Moped. Battery Questions

So food for thought since the price difference between the 1.5kW and 2kW or even 3kW isn't much at all and I'd rather be sure and pick a good one than have to buy a new laced motor or buy the hub motor myself and lace it myself (Trying to avoid that). Do you have a frame picked out already? If so, ...