Search found 78 matches

by DogDipstick
Nov 10 2019 3:44am
Forum: Items for Sale - Used
Topic: Chevy Volt individual Cells FOR SALE. 10C 15Ah
Replies: 52
Views: 4379

Re: Chevy Volt individual Cells FOR SALE. 10C 15Ah

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...
by DogDipstick
Oct 31 2019 7:51am
Forum: Battery Technology
Topic: Gear for logging C-rate vs Temperature, also capacity
Replies: 8
Views: 424

Re: Gear for logging C-rate vs Temperature, also capacity

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.
by DogDipstick
Oct 29 2019 9:58pm
Forum: Battery Technology
Topic: Gear for logging C-rate vs Temperature, also capacity
Replies: 8
Views: 424

Re: Gear for logging C-rate vs Temperature, also capacity

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...
by DogDipstick
Oct 29 2019 9:08pm
Forum: General Discussion
Topic: Torque sensing bottom bracket
Replies: 2
Views: 159

Re: Torque sensing bottom bracket

Grin got the TCDM and the THUN in stock right now. Canada.
by DogDipstick
Oct 29 2019 8:06pm
Forum: Items for Sale - Used
Topic: Chevy Volt individual Cells FOR SALE. 10C 15Ah
Replies: 52
Views: 4379

Re: Chevy Volt individual Cells FOR SALE. 10C 15Ah

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...
by DogDipstick
Oct 29 2019 9:55am
Forum: Items for Sale - Used
Topic: Chevy Volt individual Cells FOR SALE. 10C 15Ah
Replies: 52
Views: 4379

Re: Chevy Volt individual Cells FOR SALE. 10C 15Ah

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 ...
by DogDipstick
Oct 20 2019 11:56pm
Forum: E-Bike Technical
Topic: ENDURO EEB: Help me get rid of high speed wobble
Replies: 5
Views: 240

Re: ENDURO EEB: Help me get rid of high speed wobble

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?
by DogDipstick
Oct 09 2019 6:29am
Forum: Battery Technology
Topic: observable symptoms as cells degrade
Replies: 10
Views: 340

Re: observable symptoms as cells degrade

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 ...
by DogDipstick
Oct 09 2019 6:25am
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 17
Views: 494

Re: DIY Motor Dyno/load?

Yeah just use two brushless motors end to end.
by DogDipstick
Sep 28 2019 4:55pm
Forum: E-Bike General Discussion
Topic: what's the best nipples to use when rebuilding a hub motor?
Replies: 14
Views: 366

Re: what's the best nipples to use when rebuilding a hub motor?

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
by DogDipstick
Sep 18 2019 8:40am
Forum: Items for Sale - Used
Topic: LG Chem lgx p1 16s1p 15Ah 10C
Replies: 9
Views: 1159

Re: LG Chem lgx p1 16s1p 15Ah 10C

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

I have done extensive testing on them.
by DogDipstick
Aug 27 2019 8:41am
Forum: E-Bike Technical
Topic: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)
Replies: 2118
Views: 286466

Re: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)

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...
by DogDipstick
Jul 23 2019 7:04am
Forum: E-Scooter and Motorcycle General Discussion
Topic: torque steer
Replies: 8
Views: 314

Re: torque steer

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...
by DogDipstick
Jul 22 2019 6:18pm
Forum: General Discussion
Topic: Avoiding spark
Replies: 9
Views: 517

Re: Avoiding spark

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...
by DogDipstick
Jul 22 2019 6:09pm
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 565
Views: 106172

Re: Assembled Hi-Power LiPo battery packs - any interest?

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.
by DogDipstick
Jul 14 2019 8:38am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 565
Views: 106172

Re: Assembled Hi-Power LiPo battery packs - any interest?

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...
by DogDipstick
Jul 13 2019 12:58pm
Forum: Battery Technology
Topic: voltage drop under load (maybe a simple question?)
Replies: 28
Views: 1077

Re: voltage drop under load (maybe a simple question?)

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.
by DogDipstick
Jun 25 2019 7:11am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 949
Views: 106881

Re: kWeld - "Next level" DIY battery spot welder

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...
by DogDipstick
Jun 13 2019 4:22am
Forum: Motor Technology
Topic: RC ESCs in a real size motorbike? How stupid would that be?
Replies: 7
Views: 497

Re: RC ESCs in a real size motorbike? How stupid would that be?

I wonder if it has Active freewheeling for low loads ( sycronious rectivication)....
For 550$ it better lol.
by DogDipstick
Jun 13 2019 3:47am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 949
Views: 106881

Re: kWeld - "Next level" DIY battery spot welder

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...
by DogDipstick
Jun 09 2019 4:58am
Forum: Battery Technology
Topic: Adhesive-backed copper tape ampacity
Replies: 10
Views: 561

Re: Adhesive backed copper tape ampacity

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...
by DogDipstick
Jun 02 2019 8:40am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 51
Views: 4669

Re: BBS02 and BBSHD

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...
by DogDipstick
Jun 01 2019 7:40am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 223
Views: 39882

Re: Spot Welding Copper Strips to 18650 Battery Cells

Old sheet metal workers trick for spot welding aluminum too...
by DogDipstick
May 26 2019 11:27am
Forum: Battery Technology
Topic: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc
Replies: 59
Views: 17342

Re: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc

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...