Endless Sphere

Pulled a peak of 6.5 Kw today. I dont know if its the cold, or what, that is giving me high numbers, but this is fun. 20s @ 82V and 15.5Ah gives me 15 miles on 100 Amp peak, and like 30+ miles on 20-25 amps. I bet I couldd hit 40 pretty easily if I could just stay off the throttle. 90(A) X 80(v.)= 7...

silentflight wrote: ↑

Oct 30 2019 2:11pm

I use a West Mountain Radio CBA IV. It is well known, but I'll add a mention here.


http://www.westmountainradio.com/produc ... ts_id=cba4

My Powerlab6 can export to Western Mountain CBA format for using their graphing programs. Good stuff.

I use a Powerlab6. Configurable taper to .001A, Safety codes, This is cell level testing I want something to test the entire pack Ah as a whole, reliably and efficiently. Hobby grade charger ( compare to your average high end iCharger) Anything that gives me a consistent IR read tell me alot. Pretty...

Grin got the TCDM and the THUN in stock right now. Canada.

5-6 volts. It never sits there for long. Goes right up to 20% of no-load rpm. Draws 2 amps no load, with about 45mph. MPH seen is often hovering around 37- 38mph. I think the motor is a 8.5kV, and the wheel is a 24.5" final rolling diameter. At top speed it draws 1700W-2200W continious. The peak I h...

Well guys, Just an update. I would like to hear from Raygo about his pack, his choice as to whether or not to post. Personally, I have been riding these batteries for quites some while. Logged ~1100 miles on the BBS02 last season, wore out the intermediate drive one way bearing, ( problly helped by ...

Is the bike "weaving" and "wobbling?"

or just "wobbling"? If you are weaving, too, there are bigger problems.

Is it a "tank slapper" that gets worse ? Or does it go away at a certaing speed?

Ir tells the story. My CA3 tells IR of the pack. The hobby Powerlab charger I use has a IR graph. The BMS I use looks at cell health, and rates it on a 1-100 scale. There are three ways I check thae condition of my batteries. My batteries are 5 plus years old and no real change in the past year. At ...

Yeah just use two brushless motors end to end.

You can find a long nipple 12-13-14gauge from "Yojimbos Garage" on eBay cut to length for 40$ shipped. Sapim, brass, long or short.

Or here: http://www.yojimbosgarage.com/blog/?fbc ... Q0hSNq6IGU

https://www.ebay.com/str/yojimbosgarage

They are in the early Volts, albiet USED......

I have done extensive testing on them.

My contribution: Aug 2019. Sur Ron 19" x 1.4 alu rim Sur Ron hub, 110mm x 20 mm, 3mm hub holes, 5 mm offset, 11g spokes, 212mm from Treatland.tv w/ nipps 2.9 mm (lets face it, this is a MC ebike ( qs 205 bike), not a 13g spoke ebike) Duro HF319 2.5" x 19" street classic MC tire, 4lbs... 9.7 lbs tota...

Torque steer is something you see on things like trikes with two powered wheels in parallel with each other (like having motors on a tadpole trike's front wheels, or a delta trike's rear wheels), and you apply more power to one wheel than the other--then you get pulled toward teh side with more pow...

Run the current through a mechanical contacter with a resistance across the terminal? Or manually use a short piece of wire connect a piggy back precharge resister into the circuit... before connecting the main leads.. Or buy an antispark connector... or a ssr, maybe would do it. The inrush of curre...

Mr. Jones: Let me ask you this, in your 10yrs of experience, have you ever seen an internal short in a large pouch cell lipo?

I never have.

I have always wondered. Why do you build with such small cells (...5Ah), when 15, 24 or even 50Ah cells are readily available? Why parallel (9)cells when one can do the same with one cell strings, or two, cells running in parallel? There are powerful enough NMC I do believe, or am I wrong? My NMC EV...

I drop about a volt ( 1v ) when pulling 20 amps @ 58v. 15 Ah Lipo NMC pack. To know the amps used you need to know more than the voltage droop and the capacity.

For you guys who have problems with lipos... Who need to rebuild them.. ... I keep blowing my lipos, will i reduce the time required to make the weld by increasing their voltage? And there by reducing the heat and stress on the thin aluminum terminals Im currently at 3s and can make a 5s batters fro...

I wonder if it has Active freewheeling for low loads ( sycronious rectivication)....
For 550$ it better lol.

But I shoudln't get political here, just wanted to share this. I have recently upgraded the kWeld production tester 8) IMG_20190523_121819.jpg Hello again friend... I have to ask... excuse me if this is superfluous... but being an engineers son, and laboring for his small establishment... I have to...

NO. Resistance will be jacked... It says in the sheet, 500mOh / copper to copper.. and more any other metal. Ive tried this before, with different kinds of taps, and concluded adhesive is no good for amps and sheet doesn't connect easy. I have seen foil thick enough to solder to. When you study copp...

This graph here shows the unloaded crank RPM as a function of the power supply voltage. BBSxx rpm vs V Graphs.jpg The BBS02 is a faster motor winding at about 3.27 RPM/V, compared to ~2.71 rpm/V for the BBS02. Justin, Am I reading this graph incorrectly? It looks like the BBSHD is the faster windin...

Old sheet metal workers trick for spot welding aluminum too...

This is awesome.

Problem with Greentecauto is that they do not provide specs of batt modules very bad for DIY crowd. You have to dig yourself on Google to find out specs Not like HibridAutocentre which provide detailed specs of every module they sell I have had a good discussion with GTA... He is nice once he figur...