Endless Sphere

EL wire?

I originally said 18650 cells.... they are in fact 26650 M1A's That makes a lot more sense...I have yet to handle an 18650 LiFePO4 cell that could do what those 26650s could, regarding current flow vs voltage sag/heat. (all the ones i've run into were "generic" stuff, as have been the ones I've rea...

Enter a smaller wheel size That would make it slower; assuming the OP wants a faster bike he'd need a larger diameter wheel on the motor. Regarding removing the speed limit itself, I don't know how, but I'd guess that it would require access to the dealer programmer/software. There are some Bionx p...

but is is possible to use a pattern here every fourth rim hole is skipped in order to lace a 36 hole hub to a 48 hole rim ... and still have a solid, stable and strong assembly? With symmetrical skipping of one hole, it seems like it might work well. It'd work, and for most uses it'd be perfectly o...

I just upped my spokes to 12G from 13-14 double butted. I wont go much bigger in size then that. It's usually good to do that--to go from a too-large size that goes slack too easy (or breaks the rim trying to tension them enough) down to a smaller thinner size that can stretch and be tensioned corr...

I can't see the imgur page, but the CL ad pics show me enough to say that for ride quality and maneuverability, you'd be better off copying the basic idea of either SB Cruiser (first pics below) or my brother's Raine Trike (second pics), which I built based on what I learned from SB Cruiser combined...

Cvin wanted to change settings in various Rad bikes she has, and Rad said their controllers are preprogrammed and not alterable. The only way she was able to change how they worked was to replace the entire controller, wiring harness, and LCD with a new set from Rad that they'd ordered from the manu...

you might ask here
viewtopic.php?f=3&t=94543&hilit=gearsensor

FWIW, I have a 64oz "swig savvy" (also sold under other names I forget) SS vacuum bottle that using 10 regular ice-tray icecubes out of the deepfreezer, will still have ice in it (and very cold water or whatever liquid) in it 10-12 hours later, when it's in my SB Cruiser's wooden seatbox cargo area,...

AFAIK, a "50 watt" panel will only get you 50w max at the best perfect illumination conditions at noon on the equator. ;) If you need actual 50w at the load, you need to figure the efficiency hit between the panel and the load in whatever conversion electronics there are, and in the panel itself und...

Guess it depends on the kind of wax--if it's paraffin, normal Phoenix temperatures can begin to melt it. ;) Road surface temperatures, especially if sitting in the middle of a bunch of cars/etc at a traffic light, can be 130-140F or higher (on a 120F+ day at zenith I once measured 150F a few inches ...

Sounds like the BMS got wet and was damaged, causing ssome cells to be drained, and the rest to no longer be drained during balancing/charging. I would guess that the cells were damaged by overcharging (well, all the ones over 4.2v; the 3v cells might be the only ones still ok). You could test the v...

Years back, I had a peltier-type fridge with about a cubic foot and a half space inside, and IIRC it took 2 or 3 amps or more while running off it's 12v power supply; it ran a lot more than not, to keep stuff just about 60F inside, in a 90F+ environment. Adding a 5"+ computer case fan to cool teh pe...

If there's space for it, you can even use the existing hubmotor as a middrive (see the Hubmotor Mid Drive Media Group thread for a good starting point, or Rassy's old trike thread). Without pics of the trike itself, I couldn't make any specific suggestions. Or if it's a manufactured unit (rather tha...

Dunno if the Kelly's canbus can output anything useful--you'd have to check with them about that. Assuming it's a brushless setup, then you can tap off any one of the three hall sensors of the motor, to monitor it's RPM. This can be used with a frequency counter (some multimeters have this, or you c...

If the battery has the blades on it, rather than slots for them, you could make your own blades out of brass strip (or copper), and either 3d-print a holder for them or make one from strips of wood, plastic, or other insulating material, glued together to secure the blades in the right spacing and p...

And if it's a geared hub, then it can (lke my Fusin) have a speed sensor on the inside of the casing that detects speed of the outer motor shell (and thus the wheel itself, rather than the motor speed). This usually means having 9 wires in the cable vs 8, for a sensored motor, and 6 wires vs 3, for ...

Main outputs in parallel, yes. And if they're separate, then the charging inputs in parallel. I don't know if it would work to parallel the balance lines or not; I guess it depends on how the BMSs work and levels they switch on/off at. (if some switch on balancing before others, by just a tiny amoun...

If there's no exposed shaft for the magnet ring, you could glue it to the inboard side of the granny gear, and mount the sensor to the frame. Might require cutting the ring in half, possibly removing material around the core, to clear the BB shell/etc. Might also require taking the sensor off the mo...

How much current does the startup need? If it's anything like that needed by a car, you may not find an affordable BMS that can handle it, even with several in parallel. But you could run the gate control line of the BMS output to a contactor driver, and use the contactor to perform the cutoff. This...

I can't help with the sur-ron stuff, but just figured you might want to consider power needs to feed it first, to be sure you could put all that on the one bike. :) (sometimes it turns out a project isn't practical simply because of the amount/size/weight of the battery vs the carrying capacity of t...

What I don't understand is why if a PSU is adjusted to put out a constant voltage why it can't be directly hooked up to the battery or BMS? It can, as long as it also limits current in a non-hiccuping way. If there si no current limiting, then either the battery will be damaged (if the PSU can supp...

I don't have any idea how many wh/mile your usage scenario would require. For my very heavy (few hundred pounds with me on it and typical cargo) and unaero trike, my typical commute at cruising of 20MPH and average around 15ish, takes between 45 and 60Wh/mile, on level ground. Hauling a piano on the...

what kind of power usage do you expect?

if you typically use say, half that hp on average all the time thats about 10500w per hour, meaning 42000wh for a 4 hour range. A 42kwh pack is on the large and heavy side. :/

even 1/4 of that is a lot.

If your battery needs ventilation, then it is insufficient for the loads placed on it, and probably needs a lot more parallel cells.

I'd worry more about water ingress, if the battery doesnt get warm / hot.