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by neptronix
Mar 20 2019 9:02pm
Forum: Battery Technology
Topic: What battery to choose after your last one burned your house.
Replies: 43
Views: 1307

Re: What battery to choose after your last one burned your house.

Also, kudos for getting back on the electric steel horse, dogman.
by neptronix
Mar 20 2019 8:59pm
Forum: Battery Technology
Topic: What battery to choose after your last one burned your house.
Replies: 43
Views: 1307

Re: What battery to choose after your last one burned your house.

I remember when liveforphysics sorted this out many years ago. The one really impressive cell in his tests were the ungodly heavy headways lifepo4 cells. But who wants those on their bike? worse than a ping.. 18650s and pouch cells contain the same flammable elements and respond the same when abused...
by neptronix
Mar 20 2019 8:00pm
Forum: E-Bike Technical
Topic: Mid drive with GT i-Drive
Replies: 3
Views: 90

Re: Mid drive with GT i-Drive

I had one of those bikes for a nanosecond. Beautiful looking bike, but i heard about the frame weakness after i bought it.. then looked it over.. and decided it was a no-go for a hub motor.

Mid drives weren't really a thing at the time. But i think the BB area made things a bit complicated.
by neptronix
Mar 18 2019 10:49am
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang i thin I hate you... ( HALP ME!)
Replies: 5
Views: 285

Re: Bafang i thin I hate you... ( HALP ME!)

I was going to say it might be built on a friday ( bad case or something else ).. because it sounded like you gave it a hell of a try..

The QS is enormously heavy and many smaller DD hubs can be just as reliable.. and a little more efficient and a whole lot lighter.
by neptronix
Mar 18 2019 8:47am
Forum: General Discussion
Topic: using voltage sag as indication of bad battery
Replies: 11
Views: 167

Re: using voltage sag as indication of bad battery

Yes.. voltage sag will increase as IR goes up and capacity goes down. The biggest variable will be temperature, as temperature has a sizeable influence on IR. So the before and after tests need to be done at roughly the same temps.
by neptronix
Mar 17 2019 2:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang i thin I hate you... ( HALP ME!)
Replies: 5
Views: 285

Re: Bafang i thin I hate you... ( HALP ME!)

I'm no bafang mechanic but i can tell you that seeing these broken is no surprise. You may be able to fix it but another part will eventually go. The drive has multiple weak points. Over half the parts are known to not be strong enough for perpetual use. If you have access to machine shop goodies, i...
by neptronix
Mar 15 2019 9:15am
Forum: E-Bike General Discussion
Topic: Odd thing
Replies: 4
Views: 213

Re: Odd thing

You should really get a watt/volt/amp metering device. It will teach you a lot about power consumption. Whatever display you have will not indicate much of use ( what does a bar represent, exactly? :roll: ). These have always been cheap and pretty reliable: https://hobbyking.com/en_us/turnigy-180a-w...
by neptronix
Mar 15 2019 9:03am
Forum: E-Vehicles General Discussion
Topic: Is this correct to say ?
Replies: 2
Views: 90

Re: Is this correct to say ?

Yes, as long as the half-sized battery has the same internal resistance ( and thus double the load doesn't double the voltage sag )

IE.. the 2kwhr battery is 2C capable and the 1kwhr battery is 4C capable.. therefore the efficiency which the battery delivers power to the controller is unchanged..
by neptronix
Mar 13 2019 12:03pm
Forum: E-Bike Technical
Topic: Help with Magic Pie Edge
Replies: 6
Views: 156

Re: Help with Magic Pie Edge

Have you contacted the seller for support?

broken front forks with front motors is not uncommon. What kind of fork was it?
by neptronix
Mar 07 2019 9:36pm
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6744

Re: Revolt RV-series motor review and comparisons

The disappointing part with them is when they went to thinner lams, the motors didn't get any better. Since then I've always visualized them as some Israelis using ultra-cheap labor Palistinians to wind their motors. Hmm... did they lie about the laminations? I don't see how the motors couldn't hav...
by neptronix
Mar 07 2019 8:36pm
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 145
Views: 6744

Re: Revolt RV-series motor review and comparisons

I encountered this company sometime around 2014 when they started spamming the endless sphere facebook page. I remember thinking... okay, let's give these guys a chance because they're a small motor manufacturer and it seems like a cool item for ES users.. I asked for a standard dyno sheet and what ...
by neptronix
Mar 07 2019 8:17pm
Forum: Items for Sale - Used
Topic: Aden Sports Race Kit 7KW Downhill eBike 75kmh [EU]
Replies: 2
Views: 376

Re: Aden Sports Race Kit 7KW Downhill eBike 75kmh [EU]

Hell of a deal. Good luck with the sale.
by neptronix
Mar 07 2019 8:04pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 70% throttle deadband
Replies: 8
Views: 211

Re: 70% throttle deadband

This is what controllers do when they cannot handle the eRPM of the motor. They act as an on/off switch. The effect gets worse, the higher the voltage goes. If this controller came off a bike with a hub motor, it would be surprising that the motor would even run at all. My old MAC motor ( 16 poles x...
by neptronix
Mar 07 2019 4:39pm
Forum: Battery Technology
Topic: jump starting caveat - Warning!
Replies: 16
Views: 432

Re: jump starting caveat - Warning!

Yikes. watch out for idiots on youtube and facebook. This place has enough electrical engineers ( hobbyist or professional ) to keep most of us out of trouble. Generally on the internet, the more lo-fi the discussion format is, it seems like the higher the IQ is.. There are many reasons this is a ba...
by neptronix
Mar 05 2019 1:30pm
Forum: Forum Rules and Features
Topic: The future of our forum - facebook versus web forums
Replies: 50
Views: 3215

Re: The future of our forum - facebook versus web forums

Having said all of that, none of this should apply to Endless Sphere - as far as I'm aware (I haven't bothered to look deeply) there's no advert platform or user tracking analytics (aside GA which is fairly lightweight). This forum is optimized as much as phpbb can be optimized, and then there's so...
by neptronix
Feb 25 2019 3:51pm
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 1109

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

That's insane.

While we're at it, here's a picture from CERN showing the difference between a copper wire and a superconductor designed to carry 12500A.
800px-CERN-cables-p1030764.jpg
800px-CERN-cables-p1030764.jpg (91.84 KiB) Viewed 517 times
by neptronix
Feb 23 2019 12:09pm
Forum: E-Bike General Discussion
Topic: Suggest 48V 1000W hub motor & efficiency > 90%
Replies: 6
Views: 285

Re: Suggest 48V 1000W hub motor & efficiency > 90%

leafbike is the only company i know of who has published a dyno graph on any DD hub motor showing >90% efficiency in the 1500w motor. Real world testing on the motor thread has confirmed it's capable of doing that. YescomUSA is just an average mid quality clone of a clone motor and it's very unlikel...
by neptronix
Feb 22 2019 12:03pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 739
Views: 45836

Re: Tesla Model 3

https://www.glassdoor.com/Reviews/Tesla-Reviews-E43129.htm Here's an interesting snippet.. If you look at the SEC filings, you can see that the top people are basically compensated the same as the other employees, which is a pleasant surprise. Right, so just what i expected. You work for Tesla beca...
by neptronix
Feb 21 2019 10:51am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 739
Views: 45836

Re: Tesla Model 3

In this executives leaving fiasco, are there any explanations as to why people left? There has been so much smoke and mirrors on the bull and bear side of this company that i never know what to think. Ive just been buying their stock when people freak out and selling it when they get overjoyed. Buyi...
by neptronix
Feb 20 2019 8:32pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 739
Views: 45836

Re: Tesla Model 3

A lot of people pooh pooh electric cars based on current technology, assuming it won't change. I've been hearing the 'electric cars won't work because x' argument since i got interested in them in 2006. The number of reasons why they can never work keeps getting shorter. I wonder what the reasons wi...
by neptronix
Feb 20 2019 1:28pm
Forum: E-Bike General Discussion
Topic: Cheapest used bikes to make E-bikes?
Replies: 6
Views: 313

Re: Cheapest used bikes to make E-bikes?

I built everything using $50-$100 10-20 year old mountainbikes from craigslist early on. And i typically bought used parts from my local bicycle collective.

Only recently did i start spending.. gasp.. $200-$800 on used full suspension mountain bikes and semi recumbents on ebay.
by neptronix
Feb 20 2019 12:31pm
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 1109

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

Hey cool and thanks for sharing that. This is a refreshing break from all "new battery" breakthroughs we're used to hearing about. There are several other aspects of the EV drivetrain that are all deserving of improvements and it's good to see permanent magnets getting some R&D love too! NP! what i...
by neptronix
Feb 20 2019 12:02pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Good for the environment? Maybe not so much
Replies: 8
Views: 426

Re: Good for the environment? Maybe not so much

How do you stop lazyness and stupidity, mother nature used natural selection we need to emulate that without killing. George Carlin had some excellent solutions in mind. This isn't just a scooter problem. It's the fact that the cost of disposal and production of goods is extremely out of whack with...
by neptronix
Feb 20 2019 11:48am
Forum: E-Bike Build Threads / Photos & Video
Topic: High performance & durability Cannondale Semi Recumbent
Replies: 47
Views: 1404

Re: High performance & durability Cannondale Semi Recumbent

Being able to run for the first time in my life is good enough! ( i wobble and move at half the speed of most people when i try ) It turns out i get to keep the rings and hardware after the surgery because of stupid laws preventing them from being recycled and reused, even though they're easily sani...