Search found 13359 matches

by John in CR
Nov 29 2018 10:05pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Let's design a body for a Rhoades Car
Replies: 58
Views: 2031

Re: Let's design a body for a Rhoades Car

Nice one Dauntless. That's the kind of thing I've been hoping would pop up in this thread. While I'd be perfectly fine with exactly that without the gasser grill, where are the artsy design types when we need them to take that 3 wheeler and give it a bit of modern touch and better ergonomics for a r...
by John in CR
Nov 29 2018 9:55pm
Forum: E-Bike Technical
Topic: Elegant solution for 72v main power switch
Replies: 15
Views: 780

Re: Elegant solution for 72v main power switch

Elimination of unnecessary components is always the most elegant solution to me. I definitely see the appeal of this approach. Even my 20-30kw builds don't have or need main power switches 20-30kw? Wow, that's serious power! What voltages are these builds operating at? I'm using a Phaserunner on my...
by John in CR
Nov 29 2018 9:35pm
Forum: E-Bike Technical
Topic: Elegant solution for 72v main power switch
Replies: 15
Views: 780

Re: Elegant solution for 72v main power switch

If your motor is a 3 phase brushless, then there should be no need for a main power switch. Instead put a simple, cheap, reliable key switch on the low power input to the controller's logic section of the controller. Are there no possible fail-on modes for brushless controllers? Without power to th...
by John in CR
Nov 29 2018 8:56pm
Forum: Motor Technology
Topic: wich choice motor qs273
Replies: 5
Views: 255

Re: wich choice motor qs273

the wheel size is 18 inch wich better 18 or 19inch? 16 or 17. Smaller wheel diameter is always better with direct drive hubbies unless you're primary use is longer distances at relatively constant high speed, but it's pretty rare that the savings in core losses of a lower rpm for a given speed exce...
by John in CR
Nov 06 2018 8:58pm
Forum: E-Bike Technical
Topic: Elegant solution for 72v main power switch
Replies: 15
Views: 780

Re: Elegant solution for 72v main power switch

If your motor is a 3 phase brushless, then there should be no need for a main power switch. Instead put a simple, cheap, reliable key switch on the low power input to the controller's logic section of the controller. Even my 20-30kw builds don't have or need main power switches. Safety features incl...
by John in CR
Oct 24 2018 12:32am
Forum: E-Bike Technical
Topic: Known to Work Brushless Motor/Controller Wiring Diagrams
Replies: 135
Views: 49882

Re: Known to Work Brushless Motor/Controller Wiring Diagrams

I've read thru all the diagrams people have posted.& can't seem to find the diagram Im after. anyone running a q.s v3 motor with crystalytes 72v 60amp controller.. thanks in advance. So much time wasted on something I'd never trust anyway. With a few alligator clip jumper wires it's so easy to be c...
by John in CR
Oct 20 2018 10:45pm
Forum: E-Bike General Discussion
Topic: Lines erased E-Bike / E-Scooter / E Motorcycle
Replies: 172
Views: 4921

Re: Lines erased E-Bike / E-Scooter / E Motorcycle

This thread might as well be a debate about helmets, with one side being unwilling or incapable of a complete risk assessment that doesn't fit their preconceived notions. Conditions dictate what speed is or isn't safe.
by John in CR
Oct 15 2018 3:04pm
Forum: E-Bike General Discussion
Topic: Lines erased E-Bike / E-Scooter / E Motorcycle
Replies: 172
Views: 4921

Re: Lines erased E-Bike / E-Scooter / E Motorcycle

Those motorcycle statistics are badly distorted by idiot riders, and that's whether they're riding like asses or simply riding in an insufficiently alert and defensive manner. I'll take riding at traffic speeds in a manner where my survival is up to me riding mistake-free over being a slow moving ob...
by John in CR
Oct 12 2018 8:22pm
Forum: E-Bike Technical
Topic: Best rear torque arm design/layout?
Replies: 18
Views: 839

Re: Best rear torque arm design/layout?

If you use regen braking, then torque arms that clamp onto the axle are the only acceptable type using anything above very modest power. All non-clamping types will eventually deform or worse, deform the axle, resulting in a loose fit and rocking motion of the axle in the dropout. Any exceptions req...
by John in CR
Sep 15 2018 10:25pm
Forum: E-Bike General Discussion
Topic: Disadvantages of higher Battery Voltage
Replies: 38
Views: 1391

Re: Disadvantages of higher Battery Voltage

I find that the fun factor increase of running higher voltage for a given system far outweighs any detriment. 31s with the smallest wheel I could find with over 100 foot-pounds of torque with a pretty flat curve up through 80kph due to current limiting, and a top speed around 115kph depending on SOC...
by John in CR
Sep 09 2018 3:09pm
Forum: Battery Technology
Topic: High balance current BMS please help
Replies: 6
Views: 337

Re: High balance current BMS please help

I strongly recommend testing and matching used batteries before assembling a pack from them. A BMS can't fix or lengthen the life of a poor cell, and as previously mentioned one bad cell can quickly make a whole pack useless with or without a BMS. Building from used cells is fine, and it's even poss...
by John in CR
Sep 07 2018 5:53pm
Forum: E-Bike General Discussion
Topic: How resilient are hub motors to wet and bumps?
Replies: 20
Views: 1182

Re: How resilient are hub motors to wet and bumps?

Water ingress is why I prefer hubbies with wires coming out of the axle instead of a channel for the wires between the axle and bearing. Then starting on the axle I wrap electrical tape in one continuous piece with a lot of overlap from the axle to 2-3" of the wire harness down the drip loop. I've r...
by John in CR
Sep 07 2018 5:23pm
Forum: E-Bike Technical
Topic: Help troubleshooting odd ebike power issue
Replies: 5
Views: 173

Re: Help troubleshooting odd ebike power issue

Ping batteries need to be left on the charger for a long time so the BMS can balance the pack. The charger will cycle on and off numerous times during the balancing stage as the BMS drains a little out of the highest voltage cells, so the low voltage cells can be brought up to full voltage. If you f...
by John in CR
Sep 07 2018 5:08pm
Forum: E-Bike Technical
Topic: What would happen if batteries with a voltage difference of 0.1v are paralleled?
Replies: 10
Views: 449

Re: What would happen if batteries with a voltage difference of 0.1v are paralleled?

What would happen if batteries with a voltage difference of 0.1v are paralleled? [/b] Nothing other than the batteries will eventually reach an identical voltage. I've done it many times with batteries up to a 1V difference. The voltage differential is so small that the current flow between them wi...
by John in CR
Sep 06 2018 5:34am
Forum: E-Bike Technical
Topic: Kv * turns = constant?
Replies: 10
Views: 430

Re: Kv * turns = constant?

So in general, to maximize the system's power, pick the highest Kv you practically can. At some point you wont be able to fit the gearing to convert the power from high w, low T to a more useful low w, high T at the wheels You also need to consider the inefficiency of gearing. Real-world (suboptima...
by John in CR
Sep 01 2018 12:59am
Forum: E-Bike Technical
Topic: Two hub motors and controllers one throttle
Replies: 60
Views: 10482

Re: Two hub motors and controllers one throttle

DDDDDD, the CA doesn't have a shunt. It has wires that need to connect to both sides of the shunt. They're commonly connected to the shunt inside the controller, but that doesn't work if using 2 controllers (the topic of this thread), so a separate stand alone shunt is required through which the cur...
by John in CR
Aug 31 2018 7:33am
Forum: E-Bike General Discussion
Topic: electric bicycle observation - pedal cadence
Replies: 9
Views: 392

Re: electric bicycle observation - pedal cadence

I find drivers are more courteous when I ride with a video camera prominently displayed on top of my helmet. YRMV, since drivers here are reasonably accommodating to those of us on two wheels. I'm actually more worried about being smacked by a motorcycle than a car. In 10 years of riding electric th...
by John in CR
Aug 30 2018 8:58pm
Forum: E-Bike General Discussion
Topic: Electric hub for an alternative project
Replies: 21
Views: 577

Re: Electric hub for an alternative project

A pair of direct drive wheelchair hubmotors is what you're looking for. Since most of those have worm gear drive, they'll hold fast when stopped, without back-driving the motor. That seems like a good virtue for the application. One drawback is they'll constrain the depth and width of the load bed ...
by John in CR
Aug 29 2018 9:05pm
Forum: E-Bike General Discussion
Topic: Electric hub for an alternative project
Replies: 21
Views: 577

Re: Electric hub for an alternative project

A pair of direct drive wheelchair hubmotors is what you're looking for.
by John in CR
Aug 27 2018 8:12pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Crystalyte mid drive motorcycle.
Replies: 5
Views: 536

Re: Crystalyte mid drive motorcycle.

Nice clean build. How's that suspended seat using a rear shock working out for you? I love the better handling of a hardtail and have long wanted to try a suspended seat using a method like you used.
by John in CR
Aug 27 2018 8:02pm
Forum: E-Bike Build Threads / Photos & Video
Topic: The Mid Drive Hub Motor Media Group
Replies: 124
Views: 43438

Re: The Mid Drive Hub Motor Media Group

Properly geared adequately powered ebikes have no need for multi-speed setups unless you have drastically different riding uses, eg normal riding as well as low speed mountain climbing or otherwise hauling big loads. My solution has always been more power on tap, but some day I'll build a retro-dire...
by John in CR
Aug 27 2018 7:52pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Solar Cargo Bike
Replies: 18
Views: 843

Re: Solar Cargo Bike

Cool bike. I'm with SolarEbike and don't understand the full length winding of the bamboo. Cured boo is strong and rigid, so I'd think it only needs reinforcement fiber and resin at the joints.
by John in CR
Aug 27 2018 7:43pm
Forum: E-Bike General Discussion
Topic: Full suspension semi recumbent for long range
Replies: 28
Views: 908

Re: Full suspension semi recumbent for long range

What else can I do to increase range or comfort? Buy a welding machine and start working on the next one with a longer wheelbase for better weight distribution and a lower riding position. Except on large bumps my hardtail semi-recumbent with a much lower and more forward riding position (and batte...
by John in CR
Aug 27 2018 7:15pm
Forum: E-Bike General Discussion
Topic: Another Stealth bomber (clone) build
Replies: 144
Views: 6475

Re: Another Stealth bomber (clone) build

Too much phase current? Yep. I run much lower resistance (16mOhm phase to phase) higher efficiency motors at much higher peak power (28kw real peak input) and only run slightly higher phase current with 390A split between 2 controllers running a 19.25" OD wheel. The big wheel on your motor hurts to...
by John in CR
Aug 23 2018 5:54am
Forum: E-Bike Technical
Topic: High power ebike frame
Replies: 26
Views: 949

Re: High power ebike frame

For "rough trail riding" you want a mid-drive rig (motor out of the wheel). About the only one I know who does serious offroad with a hubbie is MadRhino, but he's a veteran downhiller who doesn't mind the maintenance to keep it tuned and in good working order and is willing to open the pocketbook fo...