Endless Sphere

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...

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...

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...

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...

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...

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...

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.

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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 ...

A pair of direct drive wheelchair hubmotors is what you're looking for.

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.

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...

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.

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...

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...

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...