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by spinningmagnets
Dec 17 2018 10:05am
Forum: E-Bike Technical
Topic: list of potting brands and conformal coatings for electronics
Replies: 3
Views: 47

list of potting brands and conformal coatings for electronics

The discussion as to whether a builder should add potting to electronics or use a conformal coating is likely to continue, so please don't argue in this thread. If you are the type of ebiker who likes to repair fried electronics, you hate potting. And yet, potting also provides some drop protection ...
by spinningmagnets
Dec 16 2018 2:55pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Dr_Lulz's 8kw Berg Viper
Replies: 23
Views: 1377

Re: Dr_Lulz's 8kw Berg Viper

Buy 63/37 if it's available, 60/40 is OK...I have used the most popular lead-free solder (SAC305), and all I can say is...stock up on 63/37, or 60/40...
by spinningmagnets
Dec 15 2018 7:40am
Forum: Stand-up E-scooters and E-skateboards
Topic: Razor e300 ultra. Technical guide
Replies: 15
Views: 454

Re: Razor e300 ultra. Technical guide

I didn't know something like those split wheels was available, what a brilliant idea. I have changed many flat tires in my life, and having that would have been awesome.
by spinningmagnets
Dec 13 2018 10:17am
Forum: Battery Technology
Topic: My first diy battery pack, need helps!
Replies: 8
Views: 194

Re: My first diy battery pack, need helps!

I've heard of many problems with the 120V version of the Sunkko, but apparently the 240V version seems to be reasonably reliable...
by spinningmagnets
Dec 12 2018 9:07pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Electric Buell racebike build
Replies: 22
Views: 2593

Re: Electric Buell racebike build

The link below is the most well-known first stop. You might get lucky from EBAY, or some other source, but that business is frequently the supplier of lightly used cells. http://hybridautocenter.com/HAC4/index.php?option=com_hikashop&view=category&layout=listing&Itemid=195 "Salvaged EV cells index, ...
by spinningmagnets
Dec 12 2018 2:34pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Electric Buell racebike build
Replies: 22
Views: 2593

Re: Electric Buell racebike build

Beautiful work, I'm looking forward to the finished product. If you don't already have the Leaf cell modules, it's my understanding that the newer ones have a much higher C-rate.
by spinningmagnets
Dec 12 2018 12:36pm
Forum: Large EV General Discussion
Topic: Impending Big big oil and big auto implosion plausible theory (video)
Replies: 21
Views: 389

Re: Impending Big big oil and big auto implosion plausible theory (video)

Whenever the discussion at work turns to EVs, a frequently expressed concern is that an EV can't do everything, but this is usually mentioned by someone who's family has two cars. My wife works close to home, so she is a perfect candidate for an EV. And...when large EV batteries are only cycled in t...
by spinningmagnets
Dec 12 2018 10:12am
Forum: Battery Technology
Topic: Alternative to soldering - How is this done?
Replies: 4
Views: 189

Re: Alternative to soldering - How is this done?

I believe it was likely spot-welded with a large MOT. 2V and 700A
by spinningmagnets
Dec 12 2018 7:02am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 54
Views: 3061

Re: Sensorless at standstill, development updates and status

Congratulations, this is wonderful news. Very impressive work.
by spinningmagnets
Dec 11 2018 8:18am
Forum: Battery Technology
Topic: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc
Replies: 45
Views: 8295

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

Here is an excellent video on removing the Prius hybrid battery. It doesn't just show the Prius battery removal, it is an excellent example of how to script a "how to" video. The actual battery removal is at 11:11 (after removing lots of car-body trim). Individual modules are exposed at 13:40. The n...
by spinningmagnets
Dec 10 2018 5:44pm
Forum: Large EV General Discussion
Topic: Impending Big big oil and big auto implosion plausible theory (video)
Replies: 21
Views: 389

Re: Impending Big big oil and big auto implosion plausible theory (video)

For every giant wind-generator that is built, a certain amount of gas-turbine capacity is added as a back up to ensure a steady stream of power, because the wind fluctuates too much. The gas turbines are jet engines that burn natural gas / methane to spin a generator. The US has so much methane, the...
by spinningmagnets
Dec 10 2018 2:22pm
Forum: E-Bike General Discussion
Topic: Notes on my first build, rear belt drive
Replies: 15
Views: 440

Re: Notes on my first build, rear belt drive

I think the brass pulley is a good next step...
by spinningmagnets
Dec 10 2018 1:30pm
Forum: E-Bike Non-hub Motor Drives
Topic: Do 52V packs increase BBSHD Controller Failures?
Replies: 4
Views: 165

Re: Do 52V packs increase BBSHD Controller Failures?

There is a clear benefit to helping the battery pack last many more months/ years if charged to only 4.1V per cell. There is a bigger benefit if charged to only 4.0V per cell. There is no ageing benefit to limiting the charge to anything below 4.0 V. Due to the sideways "S" shaped discharge curve, y...
by spinningmagnets
Dec 10 2018 10:01am
Forum: E-Bike Non-hub Motor Drives
Topic: Do 52V packs increase BBSHD Controller Failures?
Replies: 4
Views: 165

Re: Do 52V packs increase BBSHD Controller Failures?

My guess is that a 48V / 13S pack would work fine, and would make transient voltage spikes have lower peaks. I use a 52V pack, and if charged to the max 4.2V per cell, it should be 58.8V. I am told the capacitors are 63V max. I only charge to 4.1V per cell (*57V) and I haven't had a problem for abou...
by spinningmagnets
Dec 09 2018 6:18pm
Forum: E-Bike General Discussion
Topic: Need quick answer: rear hub motor wire should exit facing up or down?
Replies: 2
Views: 117

Re: Need quick answer: rear hub motor wire should exit facing up or down?

It should absolutely be mounted so the cable points down, and then curves back up to be zip-tied to the frame. Doing this is called a "drip loop". Its impossible to avoid keeping humidity out of the inside of the motor, but the heat of the motor evaporates almost all of it on a regular basis. If the...
by spinningmagnets
Dec 09 2018 8:43am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1568
Views: 159450

Re: Thread for new battery breakthrough PR releases

https://qz.com/1349245/the-next-major-innovation-in-batteries-might-be-here/ Though other startups have for years made various claims about lithium-metal batteries, none yet have gotten past the development or testing phases; Pellion has already been selling their battery to at least one buyer sinc...
by spinningmagnets
Dec 08 2018 7:28pm
Forum: Battery Technology
Topic: Why large parallel connection in battery packs ?
Replies: 9
Views: 331

Re: Why large parallel connection in battery packs ?

Most buses are laser-cut from a sheet of pure nickel. For "some types" of battery pack builds, the individual cells are not supported enough, so the buses actually provide some mechanical support (which I do not recommend). You are right, the series connections carry the bulk of the current, and the...
by spinningmagnets
Dec 08 2018 11:07am
Forum: Battery Technology
Topic: Fuse-wire for individual cells, DIY Tesla style
Replies: 83
Views: 11031

Re: Fuse-wire for individual cells, DIY Tesla style

An interesting fuse style on this NASA PDF: https://ec.europa.eu/jrc/sites/jrcsh/files/eric-darcy-nasa-lessons-learned-passive-thermal-runaway-propagation-resistant-designs-spacecraft-batteries.pdf A thin fuse, and a thicker fuse, so the entire strand would be running hot at high amps, and as soon a...
by spinningmagnets
Dec 08 2018 7:28am
Forum: E-Bike General Discussion
Topic: Can someone help me find this connector
Replies: 7
Views: 274

Re: Can someone help me find this connector

For a vehicle that would be exposed to the weather, I'd get a male-female Delphi "Weatherpack" connector set from a boat parts supply. You can get them with almost any pin-count.

Image
by spinningmagnets
Dec 07 2018 7:46pm
Forum: E-Bike General Discussion
Topic: Can someone help me find this connector
Replies: 7
Views: 274

Re: Can someone help me find this connector

I wouldn't be nervous to swap both male and female connectors to anything that was keyed (to prevent plugging in the wrong way)

https://www.electricbike.com/connectors ... tle-motor/
by spinningmagnets
Dec 07 2018 4:14pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 471
Views: 58769

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

The XT150 's have less resistance, and work better.

Edit: XT90's work fine, it's just that the 150's are better, and would run a little cooler.
by spinningmagnets
Dec 07 2018 1:07pm
Forum: E-Bike Technical
Topic: Mobipus Controllers
Replies: 170
Views: 13528

Re: Mobipus Controllers

Mobipus is selling a huge volume of controllers to dealers globally. There is the rare customer that owns a soldering and knows how to use it, but...I'm guessing that's less than 1% of their customers. If given a choice, I would source one with no potting, but...my main interest in Mobipus is that.....
by spinningmagnets
Dec 05 2018 9:02pm
Forum: E-Bike Technical
Topic: When to add Statorade?
Replies: 3
Views: 178

Re: When to add Statorade?

It's cheap, I'd say get it. If you ever get the motor "a little too hot" so that it demagnetised the magnets, you will wish you had spent a few bucks on Ferro Fluid when you had the chance. Cheap insurance...