Search found 745 matches

by DogDipstick
Jan 15 2021 12:05pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Building A Ludicrous 14s2p SPIM08hp battery
Replies: 40
Views: 3757

Re: Building A Ludicrous 14s2p SPIM08hp battery

I bought two of these cells to evaluate and am measuring Ir from 2.2 -> 3.0 mOhm with my PowerLab6. The cells I bought are in the holder. I did a 40A discharge and the cell only got a little bit warm. Has anyone built a pack using the holders yet? I don't know if the tabs are close enough together ...
by DogDipstick
Jan 15 2021 11:55am
Forum: Vendor Relations Corner
Topic: Battery Clearing House
Replies: 11
Views: 864

Re: Battery Clearing House

oops i mean .0008 ohms or 0.8 mohms. They are not that " .0008 ohms or 0.8 mohms." I have tested many many. From a few different batches. They are 4mOh in good, condition, and ( higher) 8 mOh or more, in used,. Could you show us this reference to the figure you state? I can show you 22 ce...
by DogDipstick
Jan 10 2021 2:21am
Forum: Vendor Relations Corner
Topic: Battery Clearing House
Replies: 11
Views: 864

Re: Battery Clearing House

A few weeks ago, I bout a 100+ SPIM08HP from them. Never buying from them again. https://drive.google.com/drive/folders/1E7bgGbxKzkBvIHm7e5A7g1guDpsVqqsP?usp=sharing I'm going to buy the 70 pack of SPIM08HP when it comes back in stock. For $2/cell as long as most of the cells are still around 0.8mo...
by DogDipstick
Jan 07 2021 10:09am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 18
Views: 678

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

Yes, lubricity is a big concern. Lol Half fill it with alcohol free gasoline and suck the O2 out. Replace it with Hydrogen under pressure of about 200KPA. Mmmmm Phase change. Lubricity. Lubricity is for valves. Grease is for bearings, and I hear bearing come with labrynth seals. Containing the grea...
by DogDipstick
Dec 27 2020 9:11am
Forum: E-Bike Build Threads / Photos & Video
Topic: Another full suspension build
Replies: 272
Views: 4144

Re: Another full suspension build

I like Cannons. Machined Cannons. I cannot afford a Fluke. My optocouplers are just gonna have to live with Harbor Freight. Resistors, get in line. Likely because I spent 780$.. wait.. no.. well, yeah around there.. maybe over a 1.2 grand by the time i'm done... daisey chaining the Uarts on my quad-...
by DogDipstick
Dec 23 2020 11:21am
Forum: Items Wanted
Topic: WTB large 48V packs
Replies: 5
Views: 143

Re: WTB large 48V packs

I could certainly build them if you make them worth my time. How much do you want to pay for ea.? Expect 400$ / Kwh. Plus shipping and insurance.. I have all options available. UPS, or freight. I can get you a competitive rate quote on both. If you want new. Used I could probally do half that or a l...
by DogDipstick
Dec 23 2020 2:06am
Forum: E-Bike General Discussion
Topic: TX and RX
Replies: 2
Views: 129

Re: TX and RX

There is an easy way to check your Serial port and configuration using "Hyperterminal" and performing a "loopback". At least then you knjow the port and that the port is working correctly.
by DogDipstick
Dec 22 2020 1:08am
Forum: E-Bike Technical
Topic: KT controller, 9 fet , not an even number ?
Replies: 1
Views: 151

Re: KT controller, 9 fet , not an even number ?

Show us a pic of the board. That might tell us what does what.
by DogDipstick
Dec 16 2020 6:52am
Forum: E-Bike General Discussion
Topic: LiPO PSA - How Not to Bun Your House Down
Replies: 15
Views: 501

Re: LiPO PSA - How Not to Bun Your House Down

Problem is dont parallel charge lipos in bulk. Lol. Parallel charging is dangerous, well known, in the hobby world. We started with pigtails.. and they were quickly found to be dangerous.. then moved to supposedly " safe parallel" boards.. and they are even not the best, even though they a...
by DogDipstick
Dec 16 2020 6:02am
Forum: E-Bike Build Threads / Photos & Video
Topic: Another full suspension build
Replies: 272
Views: 4144

Re: Another full suspension build

People are likely misinterpreting the subject line. The ebike build is fully suspended. Just check back when the suspension is lifted :thumb: Thankyou for the clarification. Understood. So After careful analysis that took me 4.2 seconds -> ... and thank you also, for the honor, friend. Yes m in it ...
by DogDipstick
Dec 14 2020 2:24am
Forum: E-Bike Build Threads / Photos & Video
Topic: Another full suspension build
Replies: 272
Views: 4144

Re: Another full suspension build

What the....?!?!?!??! I just wanted to see a bike, man. ........ not the ramblings of a ... madman, or someone on drugs... WTF is this thread full of? Lol. Not bikes, thats for sure. Maybe, nobody will ever know. Yeah pretty sure thats it. Tl:Dr; You're on drugs, right? Lol
by DogDipstick
Dec 09 2020 12:04pm
Forum: E-Bike Technical
Topic: Burnt resistor 20A 6 Fet (36-52V, IRFB3077)
Replies: 5
Views: 292

Re: Burnt resistor 20A 6 Fet (36-52V, IRFB3077)

it would seem my short was somewhere on the connections in my wiring harness that involved the cycle analyst throttle, ebrake, pas, on off switch so i am rewiring all those Thanks Be careful hooking that PAS back up again.. if you are on 72v or the like. I just took out two CA3 ( one brand new) wit...
by DogDipstick
Dec 05 2020 5:12pm
Forum: Battery Technology
Topic: Waste Heat Calculation Help
Replies: 8
Views: 357

Re: Waste Heat Calculation Help

I guess it would be easier to just run 10A through my conductor with a thermistor stuck to it... Yeah, that's probably what I would do. Lol. Sounds like the best plan. Heres another person, whom comes to mind, knows a tom more than I, and deserves the credit, when thinking along critical lines of t...
by DogDipstick
Dec 05 2020 12:00pm
Forum: Battery Technology
Topic: Waste Heat Calculation Help
Replies: 8
Views: 357

Re: Waste Heat Calculation Help

Just R * I^2, so at 10A 0.8W for copper or 3.2W for nickel. Umm...how do I convert that to temp rise in the conductor? Empirical or Virtual? Virtually you can use BTU/Min calculations. Empirical; https://www.digikey.com/en/videos/t/tensility/what-is-a-temperature-rise-test Thermal equations get ver...
by DogDipstick
Dec 04 2020 12:28pm
Forum: Battery Technology
Topic: Spim08hp 3.7v 8ah 200amp cell
Replies: 29
Views: 3530

Re: Spim08hp 3.7v 8ah 200amp cell

Here are mine. I am selling them too. If anyone is interested. 1-100, just pm me. As many as you may need. On another note, what do you guys think these are worth? 1$ ea.? 2$ea? 1.50$ ea.? Regardless,, Made in the USA. They stack, tessellate, in module, and or can be used in a parallel application, ...
by DogDipstick
Dec 03 2020 9:58pm
Forum: Battery Technology
Topic: jonescg's cylindrical cell build thread
Replies: 24
Views: 1299

Re: jonescg's cylindrical cell build thread

Lemme guess.. Fill hole?

Yah packing efficiency is what it is.
by DogDipstick
Dec 03 2020 9:52pm
Forum: Battery Technology
Topic: jonescg's cylindrical cell build thread
Replies: 24
Views: 1299

Re: jonescg's cylindrical cell build thread

These are laser cut aluminium, but I will be getting them nickel plated. The process is electroless, and uses a zinc stage in between. I'll be paying someone else to do it... Yes. That was mentioned. Yes many ways to plate. I was wondering the grade, honestly. ok. Still wondering about that blank h...
by DogDipstick
Dec 03 2020 9:39pm
Forum: Battery Technology
Topic: jonescg's cylindrical cell build thread
Replies: 24
Views: 1299

Re: jonescg's cylindrical cell build thread

Jonescg, have you seen the threads using the copper/nickel sandwich method for series? I dont know if it would be appropriate for this build, but I thought it was worth mentioning. I have always wondered about the long term integrity of such, bare copper used anywhere in an assembly. I feel like th...
by DogDipstick
Dec 02 2020 2:48pm
Forum: E-Bike General Discussion
Topic: Running higher voltage and relation to power, amps, resistance, heat...
Replies: 9
Views: 290

Re: Running higher voltage and relation to power, amps, resistance, heat...

I do that, have for about 3000 miles.... I get 8,000w from 100A @ 72v from a 1000w motor... In the winter the hubsinks keep the temp down but in the summer I need thermal rollback. Not much to gain once its hitting its thermal limit all the time. I can easy hold 35-40mph contin though. 50A with a 10...
by DogDipstick
Dec 01 2020 7:59am
Forum: E-Bike Technical
Topic: Help with Xiaoxiang BMS settings for Electric Bike Battery 52V/23AH
Replies: 2
Views: 214

Re: Help with Xiaoxiang BMS settings for Electric Bike Battery 52V/23AH

Raise your discharge current to something greater than 35 A....

You bike probably hits 45 A or more for an instant on a starting throttle application. The shunts in those BMS are not the most accurate, and the threshold of hysteresiscan make it trip when unwanted. So start with that.
by DogDipstick
Nov 30 2020 7:16pm
Forum: E-Vehicles General Discussion
Topic: Hydraulic rpm reduction
Replies: 26
Views: 561

Re: Hydraulic rpm reduction

ZeroEm wrote:
Nov 30 2020 6:49pm
The liquid can "give" like in a torque converter
No!
Yeah .. "Under pressure " is not the same as "compressed"
by DogDipstick
Nov 30 2020 6:38pm
Forum: Battery Technology
Topic: Charge controller for li ion 20S
Replies: 7
Views: 348

Re: Charge controller for li ion 20S

I use a "Hawkeye 808" to monitor the input current and stop the charge at undercurrent ( of the line) or overcurrent ( of the line). Trips a relay disconnection at a certain mA adjustable. Does it work for DC ? The datasheet doesn't say. Seems to imply AC (since it is line powered by indu...
by DogDipstick
Nov 30 2020 10:40am
Forum: E-Bike General Discussion
Topic: QS205 rim and RCP2S 265mm 750lb
Replies: 11
Views: 324

Re: QS205 rim and RCP2S 265mm 750lb

I got a set of 18" x 1 .6... I can do 80$ ea shipped. Look for Akront. Akronts are the bomb ( and Spanish, so you may find some... ) If I had the money I'd get a 2.5 by 18 36 hole and a 1.6x19 36 hole in chrome Akront aluminium. https://www.ebay.com/sch/m.html?_odkw=&_ssn=valtermotousa&...
by DogDipstick
Nov 30 2020 10:32am
Forum: Battery Technology
Topic: Shipping Battery Packs by Air?
Replies: 19
Views: 648

Re: Shipping Battery Packs by Air?

Highly regulated as HazMat goods, need to take courses to become a certified shipper. Apparent Damn... What about the demand for custom built packs? I See I'm in the niche market, We can ship anything internationally with our hazmat capable UPS shipper. It cost about $150 to ship from Florida to Qu...