Search found 906 matches

by www.recumbents.com
Oct 29 2019 11:31am
Forum: E-Bike General Discussion
Topic: Carbon e-mtb build
Replies: 16
Views: 697

Re: Carbon e-mtb build

People are reading this, but mostly just lurking. You seem to know what you want. If you ask questions, people will jump in...

Warren
by www.recumbents.com
Oct 22 2019 12:36pm
Forum: Battery Technology
Topic: Aluminum-Air Battery
Replies: 6
Views: 309

Re: Aluminum-Air Battery

If you read the article, while it claims 4x-ish the stored energy of lithium, it's not a rechargeable battery. The aluminum gets used up in a chemical reaction to produce electricity. Maybe these would be good for some military purpose or for some other expendable purpose, but it looks stupid for tr...
by www.recumbents.com
Oct 17 2019 3:12pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang bbs02 speed sensor
Replies: 6
Views: 206

Re: Bafang bbs02 speed sensor

You could also mount the magnet to the hub on the front or rear wheel if that's easier.
by www.recumbents.com
Oct 17 2019 10:18am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Need help with an "As-Is" e-Scooter
Replies: 12
Views: 438

Re: Need help with an "As-Is" e-Scooter

If the new controller only has two wires that go to the motor that means it's for a brushed motor. It sounds like you want a brushless controller.
by www.recumbents.com
Oct 03 2019 12:59pm
Forum: General Discussion
Topic: Epic fail- tried to pull out a tree stump, dug it out in 45 min- pulse 144
Replies: 30
Views: 1021

Re: Epic fail- tried to pull out a tree stump, dug it out in 45 min- pulse 144

I have dug out a lot of weed trees and bushes. I have had had good luck with cutting them off with about 5 feet of trunk left, then digging around the trunk and cutting the roots as I find them with a full size axe. Eventually you can wiggle the trunk more and more until it lays over enough to cut t...
by www.recumbents.com
Oct 02 2019 11:56am
Forum: E-Bike Technical
Topic: How to access and remove the battery of this ebike?
Replies: 36
Views: 804

Re: How to access and remove the battery of this ebike?

Or you can use an old cell phone charger to charge each cell group separately at very low current.
by www.recumbents.com
Aug 21 2019 11:38am
Forum: General Discussion
Topic: Go Cedric!
Replies: 14
Views: 710

Re: Go Cedric!

Wow, that vehicle was built in 1991??!!
by www.recumbents.com
Aug 19 2019 2:36pm
Forum: E-Bike Build Threads / Photos & Video
Topic: High performance & durability Cannondale Semi Recumbent
Replies: 273
Views: 14378

Re: High performance & durability Cannondale Semi Recumbent

velomobiles.ca has something like what you are describing.
by www.recumbents.com
Aug 19 2019 10:38am
Forum: E-Bike Build Threads / Photos & Video
Topic: High performance & durability Cannondale Semi Recumbent
Replies: 273
Views: 14378

Re: High performance & durability Cannondale Semi Recumbent

You are apparently looking for a velomobile. There are lot$ that are available. Take a look at the Quest velomobile. That's my current favorite for being a good compromise between aerodynamics and practicality.
by www.recumbents.com
Aug 16 2019 7:51am
Forum: Battery Technology
Topic: 20AH 48V pack using Samsung 25R + Agniusm modules + Generic BMS
Replies: 51
Views: 4045

Re: 20AH 48V pack using Samsung 25R + Agniusm modules + Generic BMS

After leaving it on the charger overnight, cell voltages are now between 4.07 and 4.17. Still not great. One thing I didn't mention before is that half of the 25R cells were purchased in 2015 (Luna) and only used a few times, and half were purchased in 2018 (batterybro). I imagine the 2015 ones are ...
by www.recumbents.com
Aug 15 2019 6:10pm
Forum: Battery Technology
Topic: 20AH 48V pack using Samsung 25R + Agniusm modules + Generic BMS
Replies: 51
Views: 4045

Re: 20AH 48V pack using Samsung 25R + Agniusm modules + Generic BMS

Just checked the cell pack voltages and they are all over the place between 3.7V and 3.92V. I'm charging the pack now, and will check it again when that's done.
by www.recumbents.com
Aug 15 2019 2:45pm
Forum: Battery Technology
Topic: Building a LiPo pack with high discharge (burst 300A) and BMS
Replies: 19
Views: 510

Re: Building a LiPo pack with high discharge (burst 300A) and BMS

Everything is a compromise. If he's using this battery for racing 100 cycles may last him 5 years. Be sure he knows that LiPo has much higher power density and less voltage sag but that it's more volatile than the newer cell formulations. There are lots of instructions on the web about the care, fee...
by www.recumbents.com
Aug 15 2019 2:09pm
Forum: Battery Technology
Topic: Battery issues
Replies: 3
Views: 201

Re: Battery issues

Try leaving the charger plugged in overnight and check the battery voltage in the morning. If that doesn't work it may be that the battery pack has been discharged below the point where the Battery management system will allow the pack to be charged. There are ways to charge the battery manually but...
by www.recumbents.com
Aug 15 2019 1:52pm
Forum: Battery Technology
Topic: Building a LiPo pack with high discharge (burst 300A) and BMS
Replies: 19
Views: 510

Re: Building a LiPo pack with high discharge (burst 300A) and BMS

15Ah is pretty small for a motorcycle. You should be able to find 22V 8ah 30C LiPo packs at Hobby King, or maybe even larger now, I haven't checked in a while. 4 of those packs (2P, 2S) will give you 16Ah 44V. (52V at max charge). That should give you a max of 480A. That's 300A with some headroom. W...
by www.recumbents.com
Aug 15 2019 8:35am
Forum: E-Bike General Discussion
Topic: How do i work out the range at 17 amp 58 v battery pulling a 1000 watt hours
Replies: 16
Views: 466

Re: How do i work out the range at 17 amp 58 v battery pulling a 1000 watt hours

And if the motor is really pulling an average of 1000 watts the entire time, and you have 900 WH available, then you can ride for .9 hours at whatever average speed it's pulling an average of 1000 watts at. That's 54 minutes which is probably realistic in your average riding environment.
by www.recumbents.com
Aug 15 2019 8:29am
Forum: E-Bike General Discussion
Topic: How do i work out the range at 17 amp 58 v battery pulling a 1000 watt hours
Replies: 16
Views: 466

Re: How do i work out the range at 17 amp 58 v battery pulling a 1000 watt hours

If the motor is rated at 1000 watts, it's not going to draw that amount all the time, so I'm going to throw that out the window. I'm going to take a WAG by estimating 20 wh/mi. This is assuming that you are just cruising along and not going up big hills or making jackrabbit starts or riding at 30+ M...
by www.recumbents.com
Aug 13 2019 3:54pm
Forum: E-Bike Build Threads / Photos & Video
Topic: High performance & durability Cannondale Semi Recumbent
Replies: 273
Views: 14378

Re: High performance & durability Cannondale Semi Recumbent

And never remove the lawyers lips. You may forget to tighten the front wheel and crash! :roll:
by www.recumbents.com
Aug 13 2019 1:10pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Spare parts E-BMX Build "Deathbike Junior"
Replies: 50
Views: 4454

Re: Spare parts E-BMX Build "Deathbike Junior"

Ordered the taps to clean out the crank arm pedal threads and the aforementioned cheese-free pedals. Plans for a new faster e-bike to replace this one for the kid are solidifying. I'm going to use my old BMC "600 watt" motor and its Crystalite controller with an existing inexpensive steel hardtail M...
by www.recumbents.com
Aug 12 2019 11:06am
Forum: E-Bike Build Threads / Photos & Video
Topic: Spare parts E-BMX Build "Deathbike Junior"
Replies: 50
Views: 4454

Re: Spare parts E-BMX Build "Deathbike Junior"

According to the speedo on the bike he's got close to 300 miles on the bike so far. Top speed is now down to about 13 MPH, so the ol' Ping is slowly losing juice. The latest failure is that the left pedal completely stripped out the threads and fell off. I have never seen anything like that before! ...
by www.recumbents.com
Aug 09 2019 3:02pm
Forum: E-Bike Non-hub Motor Drives
Topic: Converting B'twin Bike to Electric
Replies: 59
Views: 1936

Re: Converting B'twin Bike to Electric

I did it for you -
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bad.png (38.99 KiB) Viewed 172 times
Now do you see it?
by www.recumbents.com
Aug 09 2019 2:45pm
Forum: E-Bike Non-hub Motor Drives
Topic: Converting B'twin Bike to Electric
Replies: 59
Views: 1936

Re: Converting B'twin Bike to Electric

Because you are a student we are trying to help you learn.

Redraw your schematic to show that you are using one power supply instead of multiple power supplies. Now do you see it?
by www.recumbents.com
Aug 08 2019 12:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: Converting B'twin Bike to Electric
Replies: 59
Views: 1936

Re: Converting B'twin Bike to Electric

If either input and output are shorted together it won't work. That means it's not isolated. Do you understand why that is a problem?

Just google "isolated buck converter" for an explanation.
by www.recumbents.com
Aug 05 2019 2:00pm
Forum: E-Bike Non-hub Motor Drives
Topic: Converting B'twin Bike to Electric
Replies: 59
Views: 1936

Re: Converting B'twin Bike to Electric

At the very least, don't tie the input [-] to the output [-] !

You should be able to read the Buck converters technical specs to see if they are isolated.