Endless Sphere

still available. price flexible.

i found similar limitations on my fat ebike. around 7in (your 20cm ) it gets very squirrely (and fun). i stay away from snow covered sidewalks and iced over areas without studs.

What studs did you buy? i found a few small ones on aliexpress but never ordered.

youd need to make a harness to connect the two packs for use in the bike. for series youd connect the + of one pack to the - of the other and then the remaining + and - are your overall pack leads. just use whatever gauge the leads on the batteries are, or one step larger (smaller #) for charging, j...

I find it hard to believe that your cells are within 1.5% after repeated use and charging cycles. By that logic we shouldn't use any complicated electronics cause they're more likely to fail.... it technically does have 20x the failure points, but it was worth it to me if every cell hit 4.2v on ever...

I added a 12v brake trigger to my hydraulic brake handle and was in the process of setting up regen braking on a Sabvoton 72150 when i found this weird issue. As the title says, regen mode makes the bike gain speed. I had the bike on a stand, gave it a bit of throttle, triggered the brake switch ......

I did end up finally making this. The theory was right as I expected. I did add heatsinks to the TP4056 ICs just to make sure they dont current limit due to heat. Now they sit at 40-50degC The main problem is the 4.20v +- 1.5% shut off variance (that's 4.26v max). I would have much preferred a 4.2v ...

I have a new unused D7500-K1 kit from eastgem for sale. $700 obo with shipping from the US. 20191106_182506.jpg This hasn't even been powered up, but i can assemble it quick for a test if you'd like. Rated power: 7500W Peak power 15000W Voltage 48V - 72V Max speed: 4500 RPM Weight of full set: 8.5 k...

Nice build. The QS205 50H looks small on compared to those tires and wide dropout. That rig is going to be a crazy horse. :bigthumb: Thanks, I had no idea. By the calculations it was 0-30mph in 6seconds w/ a 45mph top speed. Thank god i was cautious when i was trying this out cause it pops wheelies...

Made up the torque mounts like a month ago and then plated them yesterday: 20191020_175816.jpg Installed on the bike: 1.jpg Last thing to do was to bleed the brakes because i switched the front/rear brakes between the left and right bars as i ride motorcycles as well. Problem is that the check valve...

I have pretty much everything i need to finish the bike except for the last few custom bits: torque arms, sabvoton mounts, cover panels etc. got the rear wheel laced up with Sapim strong spokes, brass spoke washers, and SS spoke nipple washers 20190921_190846.jpg Also designed up these torque arms a...

Looks like WYE to me. the three ends are tied together right there in the black heatshrink.

Is that a qs hub motor?

You should go for a 150/200A controller if ya can for better acceleration. And a higher rated bms for sure

(Imo)

600A that must be on your 250 clone?

I should buy one of those, they look pretty good!

I would think you could use two 10s chargers concurrently for one 20s pack as long as the chargers are isolated like how my idea works. Meaning, the chargers couldn't share an AC-DC converter, they'd both have to plug into the wall separately. It almost certainly would not work with the dually 10s c...

That's a pretty good setup you have outlined there. those dual 10s chargers are only $350, so not bad at all.

Wish i could find a good solution to the low voltage protection during use though.

Not sure what size pack you have, but for the several hundred++ you're already spending on cells, spending an extra hundred or so on a bms over the cost of what you're suggesting a here shouldn't be a big problem, and will save you a lot of trouble. Or bulk charge and monitor your cell voltages man...

So i've been looking into how to charge my 20s pack for my ebike... Heres the predicament: -Cheap BMSs are scary, quality boards cost $$$$ -I couldn't find a simple monitor/equalizer that would bleed off high cells as well as notify me when any cell reached 3.2v (they all trip at ~2.5v for what ive ...

That looks sweet! I'm in the middle of building a fat tire e-bike as well. Going hub drive with a QS205 50H Though

Hi all, new to the forum and this is my first ebike build. It's still in progress Specs: Dynacraft Krusher 26X4 Fat Tire bike -Steel Frame -36 spoke 80mm rims -165mm rear dropout -Upgraded to M445 Shimano hydraulic brakes from stock mechanical -5" riser bar for more comfort -Slightly modified Rad Ro...

ABS is trickier to print but will hold up better outside. Especially from heat. PLA would probably be ok outside if it was a lighter color and not contained within a box where heat could build up.

hias9 wrote: ↑

Aug 26 2019 4:59pm

Ideal would be two waterproof 3way mini toggle switches on a bicycle handle bar mount.
Any ideas how to make this?

I just bought some on ebay with waterproof boots. I'm 3D printing holders that clamp onto the bars.

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