Search found 897 matches

by DogDipstick
Sep 19 2021 8:02am
Forum: EBike General Discussion
Topic: Cleaning inside of motors
Replies: 14
Views: 246

Re: Cleaning inside of motors

unless it was needing new bearings, and I cleaned only the bearings seats then. Quick off topic but do ya have that bearing part number orrhand? My bearings are getting play. Clunkthunk. Can wobble the rear wheel at least 1/8-3/16 inch. Its distinctly the bearings. Grease probally washed out when w...
by DogDipstick
Sep 18 2021 6:43pm
Forum: Battery Technology
Topic: A123 20AHr Pouch Cell Battery Build & Info Thread
Replies: 1000
Views: 153940

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Ok one more cell went dead. so I have that riveted one and this was a 24s pack and will leave the copper rivet cell and run one as 11s and one as 12s still good for 62v lvc controller cutoff. No bms just balance wires. I don't see there with there would be a problem with running a 12s and 11s in se...
by DogDipstick
Sep 18 2021 4:48pm
Forum: Battery Technology
Topic: One BMS to rule them all
Replies: 9
Views: 306

Re: One BMS to rule them all

Ok. Copy this. Fer less than 146$. Go for 32s. If there is a hobby market. If the market is 96s, coolio.. but isnt a distributed BMS safer there? https://www.ebay.com/itm/114978507669?hash=item1ac540cb95%3Ag%3Ad5EAAOSwcGNhORer&LH_All=1 This BMS will easy peak 600A. Who want a metal oxide semicon...
by DogDipstick
Sep 18 2021 2:14pm
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 84
Views: 2725

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

Brakes are better at braking than non-brakes. You're bending over backwards to do things sub-optimally. I am actually trying to destroy my brakes at the time being ( ready for replacement ) and the front is holding its own.. Shminmo 4 POT.. BUT the rear is trashed. Lil Shimano. Big 8" hub moto...
by DogDipstick
Sep 18 2021 2:12pm
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 84
Views: 2725

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

Regen can be awesome if you have a strong pack. Used to use hobbyking lipos, with a 5C charge rate. No problem dumping 1000W into them. Eliminated my rear mechanical brake because it wasn't necessary anymore :lol: great breaking!! *Braking. I LOL @ hobbyking lipos. They are weaksuace. Sure they say...
by DogDipstick
Sep 18 2021 1:52pm
Forum: Motor Technology
Topic: Kelly Controller power ratings
Replies: 7
Views: 170

Re: Kelly Controller power ratings

I know how this works. I can tell you absolutely, I think.,. Tractive effort ( curve ) load, battery ability, RPM rang and kV, all have an effect. Time, current demand, whats what... On how Kelly lays out the power. For instance: Here is a KEB72801X: 2018 controller. 8Kw rated by Kelly. 350A peak, 1...
by DogDipstick
Sep 17 2021 3:24am
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 84
Views: 2725

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

I got a MAC mid drive geared motor. With just about any electric motor pole switching speed plays a huge part of efficiency. It starts at 0 RPM where efficiency is zero. BLDC motors can't pack enough poles to be efficient in a hubmotor envelope to be very efficient below 150 RPM or so, and even Thsi...
by DogDipstick
Sep 15 2021 11:39pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

see we which translates very stressful need feeding from ought was what you have? respectively. known #cycles lifespan, maybe only 1-2% NBD But lucky you Lol No John. OP ( Original Poster) confirmed for us that in fact, the are 3.62vn LION cells,.... NOT LFP, and they have a nominal voltage of 3.62...
by DogDipstick
Sep 15 2021 9:25pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

Let me guess. You SET the Power supply to ( 4.2)v... but MEASURED the terminal @ 3.6v. Watch that EEEVBLog vid relating to DC compliance. Yes? Compliance voltage. Watch that EEVBlog vid relating to the nature of power sources and DC compliance.. The nature of electrical nodes. Ect. An electrical eng...
by DogDipstick
Sep 15 2021 8:51pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

Addy buddy.. If it was a foot of wire.. ( 1/1000)(1000)... ( 1) 4.2v power source at one end.. and the resultant voltage read at the other end of the wire..As 3.7v... ( losing 0.5v, through 1 foot, a resistance of 200mOh, @ ) That wire is .... very very small... 1.25w ( 0,5(v) x (2.55(A))... would b...
by DogDipstick
Sep 15 2021 8:11pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

It's not false, it's basic electronics. How about you provide some kind of reasoning or proof before you go around mistakenly telling people that they are wrong? [/quote] You are not dropping half a volt on 20 gauge wire with 2.5A through it at 3.6 volts. .. That is the first clue. . This is the ba...
by DogDipstick
Sep 15 2021 7:43pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

bymannan wrote:
Sep 15 2021 7:23pm


I'm betting my house it's nominal lol
Yeah. Its a shame they quite often destroy the QR codes. The solar forums are literally RIDDLED with questions about the QR code deciphering and destruction.
by DogDipstick
Sep 15 2021 7:21pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

Looks very close to a ( slightly puffed, b/c of the valve pressure or a vacume.. because of the valve pressure. is optical illusion) lifepo cell. Lemme guess the positive is black and the negative is tan? Maybe? Yeah 3.62v185wH say right there. I do hope thats nominal, lol. Ty. I guess its lithium i...
by DogDipstick
Sep 15 2021 7:06pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

I meant for each cell, not for all of them. In any case, I do not have anything the can remotely provide 50A :) [/quote] Understood. In parallel it IS one big cell. Please tell me they are Lithium -Ion, NOT LIfePo4, like I am assuming, and the inherent 4.2v charge voltage vs the 3.65v charge voltag...
by DogDipstick
Sep 15 2021 6:57pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

So here's the scenario. I have 5 50Ah cells in parallel. They can do 1C of charging which means they can pull 50amps. THis one statement shows your misunderstanding. My friend. Whn you place cells in parallel. 5x ( 1c, 50Ah cells in parallel... ) = 250A. Two-Hundred and Fifty amps. Is a "1C&qu...
by DogDipstick
Sep 15 2021 6:49pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

The question is, can I set the PSU to say 20V and charge faster provided that the cell internal voltage does not exceed 4.2V? I know it means I need to keep sampling the cell to make sure they don't go over, probably to reduce the voltage to 4.2 when they get close. DO NOT DO THIS. THIS NEGATES THE...
by DogDipstick
Sep 15 2021 6:46pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

I'd recommend getting some better leads for that power supply. If the power supply is putting out 4.2V and 2.5A, yet the voltage at the cells is still 3.69V, that voltage difference is being wasted in the wires. With better wires you'd be able to put out higher current with the same 4.2V setting. T...
by DogDipstick
Sep 15 2021 6:38pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

I'd recommend getting some better leads for that power supply. If the power supply is putting out 4.2V and 2.5A, yet the voltage at the cells is still 3.69V, that voltage difference is being wasted in the wires. With better wires you'd be able to put out higher current with the same 4.2V setting. O...
by DogDipstick
Sep 15 2021 5:08pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

john61ct wrote:
Sep 15 2021 3:01pm


But offering 40A to a 3Ah cell is a recipe for disaster.
yup. cetrainly.
by DogDipstick
Sep 15 2021 1:52pm
Forum: Battery Technology
Topic: How do fast chargers work?
Replies: 33
Views: 547

Re: How do fast chargers work?

What you see, is the term, " compliance voltage of a circuit." I can hit any cell with a CC power up to (infinite? ) amps if the source can pull it.. but.. if the cell reaches the (chargers CV phase) 4.2v.. the top voltage, current transmission will drop... as long as the circuitis not pro...
by DogDipstick
Sep 15 2021 11:31am
Forum: Electric Watercraft
Topic: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor
Replies: 79
Views: 10144

Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

"averaging 700-900 watts" That is alot of power for a set of solar panels, right? 5+kWh in the day? Seems like alot ( of power). God Damn. Look at those ball screws. Them are some ballscrews. I have a teacher inthe family who does nothing but CAD and 3d printing destign and schooling. I h...
by DogDipstick
Sep 13 2021 8:40am
Forum: Items for Sale - Used
Topic: LIQUIDATION SALE! $1.5 per cell NCR 18650 GA 3450 mAh 92%-98% UNUSED
Replies: 5
Views: 505

Re: LIQUIDATION SALE! $1.5 per cell NCR 18650 GA 3450 mAh 92%-98% UNUSED

Is there any affiliation with the JAG35? Are you a retail seller, or an ebiker? Do you have an ebike?
by DogDipstick
Sep 13 2021 8:38am
Forum: Items for Sale - Used
Topic: LIQUIDATION SALE! 36v 10s4p 12.8ah Okai es200G battery $70 (sold out everywhere else)
Replies: 2
Views: 126

Re: LIQUIDATION SALE! 36v 10s4p 12.8ah Okai es200G battery $70 (sold out everywhere else)

https://jag35.com/collections/lithium-batteries/products/copy-of-40-cell-ncr18650bd-18650-lithium-scooter-battery-pack-w-case-1 PLEASE READ THE DESCRIPTION BEFORE BUYING OR ASKING ANY ADDITIONAL QUESTIONS 1 Flat horizontal.jpg2 back flat.jpg3 flat connector.jpg4 side.jpg5 connectors.jpges200g-pack-...