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by spinningmagnets
Nov 18 2019 5:48pm
Forum: Battery Technology
Topic: Is a 24s battery dangerous?
Replies: 24
Views: 508

Re: Is a 24s battery dangerous?

There is a frequent argument about how to attain "X" amount of watts from high-voltage-low-amps, or....low-voltage-high-amps... LFP made the argument that...if you plan ahead to use "enough" watts, then...you will spend very little time drawing max watts, so... If you choose low volts and higher amp...
by spinningmagnets
Nov 18 2019 3:56pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: I sewed a seat for my Sur-Ron
Replies: 7
Views: 269

Re: I sewed a seat for my Sur-Ron

The large central panel of a leather seat is a perfect canvas to create art, and there us a small percentage of owners who will gladly pay big bucks for a custom seat. When I retire, that will be one of the hobbies I planned on taking up. The tools for leather work are affordable for starting out. h...
by spinningmagnets
Nov 18 2019 3:46pm
Forum: Battery Technology
Topic: Is a 24s battery dangerous?
Replies: 24
Views: 508

Re: Is a 24s battery dangerous?

Years ago, the next performance upgrade for ebikes from 48V was 36V X 2 = 72V.

DIY packs and retail 72V packs are now more available, so dual-36V has become rare.
by spinningmagnets
Nov 18 2019 2:59pm
Forum: Battery Technology
Topic: Is a 24s battery dangerous?
Replies: 24
Views: 508

Re: Is a 24s battery dangerous?

I have read of, and seen old electricians checking AC mains voltage across two fingers on the same hand using a certain technique. If you use the wrong technique, the muscles in your hand contract, which is bad. Also, current running through your hand can "cook" the muscle tissue. Decades ago, I had...
by spinningmagnets
Nov 16 2019 7:02pm
Forum: Motor Technology
Topic: More than3 phases
Replies: 9
Views: 451

Re: More than3 phases

Fisher & Paykel makes 7-phase motors. Falco makes 5-phase motors.

Somewhere around here there is a thread that has large six-phase motors, which allows the option of running it on two common 3-phase motors.
by spinningmagnets
Nov 13 2019 11:23am
Forum: Battery Technology
Topic: Bilding a 'distributed' 3s 6p Li-Ion pack
Replies: 9
Views: 256

Re: Bilding a 'distributed' 3s 6p Li-Ion pack

Years ago, LiPo from the RC world was the easiest option for a high-amp pack. Plenty of ebikes were built with no BMS on the bike. All the lipo packs were balanced by the RC charger. Many of the packs were bulk-charged by seriesed Meanwells several times before the owner would do a balance charge. (...
by spinningmagnets
Nov 11 2019 1:15am
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 2639

Re: Why not comfort bikes?

How tall are you and what's your weight?
6-foot, 200-lb
by spinningmagnets
Nov 10 2019 6:41pm
Forum: Battery Technology
Topic: Nishi 18650 pack building kit
Replies: 43
Views: 2311

Re: Nishi 18650 pack building kit

I'm not selling Nishi kits, or Vruzend. I have no axe to grind. You can ask Micah for verification that I've owned every Vruzend version if you like. I'm un-impressed by the high price and poor customer service from Nishi, but I liked the product. I'm curious about the quality deficiencies you found...
by spinningmagnets
Nov 09 2019 5:35pm
Forum: Battery Technology
Topic: Nishi 18650 pack building kit
Replies: 43
Views: 2311

Re: Nishi 18650 pack building kit

I have a Nishi kit and also a Vruzend V2 (*I needed them for the pictures in the article). I found the quality of both to be good.
by spinningmagnets
Nov 08 2019 7:54am
Forum: Battery Technology
Topic: Super Capacitors for "Burst Mode"?
Replies: 27
Views: 540

Re: Super Capacitors for "Burst Mode"?

Maxwell has some patents that would be useful for Tesla batteries. If another company bought them, Tesla and others would be locked out. Since Tesla makes their EV patents open to the world, this was a very good thing.
by spinningmagnets
Nov 06 2019 12:53pm
Forum: E-Bike General Discussion
Topic: E-S LMX 64 Bike Owners
Replies: 269
Views: 15208

Re: E-S LMX 64 Bike Owners

I am under the impression that the 12T drive sprocket is louder than the 14T. Is there a big difference in noise, or just a little?
by spinningmagnets
Nov 06 2019 11:24am
Forum: Battery Technology
Topic: Spot welder
Replies: 7
Views: 279

Re: Spot welder

If you havent bought the VTC cells yet, seriously consider Nissan Leaf cells as an option. If you already have the VTC cells, buy the kWeld, and practice on junk cells first.

https://www.electricbike.com/yuba-nissan-cells/

https://www.facebook.com/groups/KWeldNorthAmerica/
by spinningmagnets
Nov 06 2019 8:02am
Forum: General Discussion
Topic: E-Curious Petrolhead
Replies: 4
Views: 269

Re: E-Curious Petrolhead

Welcome. The 240SX is a beautiful car. It seems the LS V8 is being swapped into everything these days. If I had a 240SX, I'm a bit more casual. I'd look for an all-aluminum narrow-angle V6 to use as a daily driver (Nissan VQ35HR?). Or an electric conversion? Anything would be better than crushing th...
by spinningmagnets
Nov 06 2019 7:49am
Forum: Battery Technology
Topic: Spot welder
Replies: 7
Views: 279

Re: Spot welder

I don't recommend 0.30mm nickel. What cell are you using, and how many amps per cell do you need?

viewtopic.php?f=14&t=89039&start=925#p1508612
by spinningmagnets
Nov 05 2019 8:16pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 961
Views: 109937

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

My current thinking (no pun intended) is to weld a copper series connection along with a nickel parallel connection on top of it at the same time but with the two tabs running 90 degrees to each other (i.e., the copper bar in the series row and the nickel bar in the parallel row). BatteryCopperSeri...
by spinningmagnets
Nov 03 2019 11:51am
Forum: Motor Technology
Topic: Honda Civic Hybrid motor, 12" x 2" pancake inrunner
Replies: 6
Views: 438

Honda Civic Hybrid motor, 12" x 2" pancake inrunner

Title says it all, pulled from a junkyard very cheap. Located between engine and transmission, so you have to pull the engine to get at it. Designed for 10kW, 144V (70A peaks?) Fast Forward to 5:00 mark for motor removal (second motor pull shown at 9:20) Fast Forward to 6:40 for 144V battery removal...
by spinningmagnets
Nov 02 2019 8:34am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 961
Views: 109937

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

Interesting, thanks for sharing. How could I avoid this when using a transformer?
by spinningmagnets
Nov 01 2019 1:05pm
Forum: E-Bike Technical
Topic: DIY custom frames, home carbon-fiber method simplified
Replies: 65
Views: 32202

Re: DIY custom frames, home carbon-fiber method simplified

Some great tips for fiberglass. This is for a DIY boat, but I think its applicable to bike frames.

https://www.youtube.com/watch?v=3Pc-Sd_J26E
by spinningmagnets
Oct 29 2019 7:09pm
Forum: Motor Technology
Topic: MagnaChip new 100V mosfet
Replies: 2
Views: 390

Re: MagnaChip new 100V mosfet

I don't know. I like to wait for a 3rd party test from a trusted source before embracing a position on a new product. I only posted this because it looks like news.

As far as I know, It could be crap. Waiting to see...
by spinningmagnets
Oct 29 2019 2:39pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 961
Views: 109937

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

When using copper strips with nickel over it, I am certain the nickel does not need to be as thick as 0.30mm, but of course it certainly would not hurt. "...would you mind commenting on probes. I imagine somewhere in the thread you have, but I''m at a loss finding that. Are any of these materials a ...
by spinningmagnets
Oct 26 2019 4:12am
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 26
Views: 1401

Re: JP spot welder open source

I'm sure anyone here can order the welder electrodes from kWeld and try them on a JP welder. I am certain they would work fine.
by spinningmagnets
Oct 23 2019 8:57am
Forum: E-Bike Technical
Topic: Hub motor re-wire in 10 GA
Replies: 4
Views: 298

Re: Hub motor re-wire in 10 GA

Look for Teflon insulated wire. Thin, tough, and resistant to high temps. Also called PTFE.