Recent content by caza

Am I correct in my reading that these controllers only have on/off regen and there is no way to throttle the regen?

Definitely not going to stop a lipo fire, but maybe it would help the fire from spreading to its surroundings?

You've mentioned pre-tabbed cyllindricals before, do you have any examples or sources worth using? Most of what I see pre-tabbed are either no-name cells of unknown quality, rated for extremely low amp draw, or significantly more expensive than the same cells without tabs. Seems to me that the...

These are the top options I'm considering right now. Molicel P42a's. Two packs side by side, 20S16P. 4.7KWH nominal. $1500~ for the cells alone. These seem like the best choice for "vape pen cells" for my application. At 16P, even at 200A peak load each cell would only see 12.5A, well within...

Here's the bike with the motor in place. The little mount the motor came with bolted perfectly in place to one of the stock mounting points and it's nearly perfectly aligned with where the old sprocket was. I'll be adding a much more robust bracket but for now it's nice to know the motor...

There are a few variables but a calculator is what's going to get you in the ballpark. Your RPM is going to depend on your pack voltage, controller, settings, flux weakening, etc. But you can get a pretty good idea from the datasheet. You didn't specify exactly which motor you're using but I'm...

Welgo terminals seem to be way more space-hungry than what I'm proposing though they are a really interesting solution especially since you could modify your s/p config. It would certainly be less dense than a nickel-strip battery or even a busplate battery, but not by much. It would be thicker...

One of the common complaints I've seen about typical 18650 builds how they are not easily serviceable and require total disassembly to replace a single cell, as well as not being able to check on individual cells. There are options like vruzend and N.E.S.E modules, but they both have some...

I replied to this but it seems the post got lost. I have read that these cells can degrade quicker, but it's hard to find testing data on what kind of degradation to expect. The good news is I don't expect to ride this every day. Maybe a couple cycles a week excluding when it's particularly...

So the short version is just crimp on your connectors, incessantly monitor them, and just hope they don't catch on fire? It just seems like a more high risk way of building a bigger pack. I'm definitely confused as to how you properly run a BMS on cells that are already in series before you...

To be fair streets still sometimes have hills and the ability to deal with them is just as relevant on a street bike. I have some pretty decent hills to get to the other side of town where my mother lives, it would be nice to not be bogged down on them. We also have a small local mountain with...

Personally I enjoy the noise of a chain on an emoto, but I understand not all share my enthusiasm. As you said, maybe a hub would have been a more efficient choice, but the motor is on the way, for better or for worse. It seems more and more likely that I go down the cylindrical route. I would...

I'm not totally against it, but I wanted everything to bolt on without modifying too much of the base bike, and none of the QS hubs I looked at were the right size for the existing swing arm. Between buying a second swingarm to modify, buying and setting up a rear disc/caliper, it seemed like...

Thanks for all the replies. I think your right that I could probably fit those A123 cells, though I think I'd have to have a split pack. Certainly a good option. I'll definitely share pictures once I get the build going. I want to get the ICE out of there and the QS motor in place, after that...

I did some very basic research on hobby packs and quickly decided I don't think they are for me. The seemingly high dud rate, fire rate, totally untrustworthy specs, And generally lack of good info on building bigger packs safely with them all make them seem far too risky to be worth it. I do...