Search found 912 matches

by www.recumbents.com
Feb 19 2020 10:15am
Forum: E-Bike General Discussion
Topic: Best Value fast ebike for my commute?
Replies: 24
Views: 402

Re: Best Value fast ebike for my commute?

I had a similar commute (15 miles round trip, in and out of a river valley each way). A 20Ah x 50V nominal battery (60V charged) and a decent hub motor as described by 2old will work great. I went to work and back without charging and cruised at about 30 using a BMC "600 watt" geared hub on a dual s...
by www.recumbents.com
Jan 07 2020 11:39am
Forum: Motor Technology
Topic: Induction motor sevcon gen4 issue
Replies: 4
Views: 431

Re: Induction motor sevcon gen4 issue

It sounds like the controller is having a hard time staying in sync at lower RPMs. Is it using hall sensors to determine the motor phase?

Warren
by www.recumbents.com
Jan 07 2020 11:31am
Forum: Stand-up E-scooters and E-skateboards
Topic: 1000w controller on a 250w motor
Replies: 3
Views: 675

Re: 1000w controller on a 250w motor

It will work fine but you will need to watch your motor temp and avoid jackrabbit starts as it may overheat when you are pushing more current through it.

Warren
by www.recumbents.com
Jan 06 2020 4:22pm
Forum: Forum Rules and Features
Topic: The future of our forum - facebook versus web forums
Replies: 100
Views: 20226

Re: The future of our forum - facebook versus web forums

When that happens they are usually all from the same IP and then I start blocking signups from IP ranges. It's mostly China...
by www.recumbents.com
Jan 02 2020 1:01pm
Forum: General Discussion
Topic: What's with this censoring nonsense happening on the forum?
Replies: 122
Views: 8413

Re: What's with this censoring nonsense happening on the forum?

The bickering often overshadows the content on web forums, and that turns many people off. I have had a lot of experience with the same thing on my forum. The people without the ability to filter themselves or get along with the rest of the community will run roughshod over the community if left unc...
by www.recumbents.com
Dec 23 2019 3:03pm
Forum: Battery Technology
Topic: Battery build question
Replies: 8
Views: 423

Re: Battery build question

If the current is regulated to 25 amps then 25 amps flows through the entire circuit.
by www.recumbents.com
Oct 29 2019 11:31am
Forum: E-Bike General Discussion
Topic: Carbon e-mtb build
Replies: 16
Views: 1139

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: 554

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: 441

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: 921

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: 1637

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: 1484

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: 1195

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: 279
Views: 23814

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: 279
Views: 23814

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: 4982

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: 4982

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: 826

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: 302

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: 826

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: 699

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: 699

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: 279
Views: 23814

Re: High performance & durability Cannondale Semi Recumbent

And never remove the lawyers lips. You may forget to tighten the front wheel and crash! :roll: