Search found 14203 matches

by John in CR
Aug 07 2020 10:41am
Forum: Motor Technology
Topic: Surron Motor tuning with datalogs! FOC experts needed
Replies: 11
Views: 506

Re: Surron Motor tuning with datalogs! FOC experts needed

It looks like that knee in the battery current occurs as the field weakening kicks in, so I'd definitely start with the FW turned off. That will give you a more gradual tapering of battery current with rpm due to BEMF. FW is for extending top speed, and your graph seems to confirm what I've suspecte...
by John in CR
Aug 05 2020 7:36pm
Forum: E-Bike General Discussion
Topic: UK will be electric bike capital of the world!
Replies: 43
Views: 884

Re: UK will be electric bike capital of the world!

https://petition.parliament.uk/petitions/332333?fbclid=IwAR2AiPM7IPVMjQwtguEGP0a2r68S_xJGqvE8q9gRdX3qFyxac1OR2a_Z4Ls Petition to increase the 25kmh limit on electric bikes in the UK. Let's go guys, I already signed I got stopped for going 27kph in a 10kph zone on a multi-use pathway, at the bottom ...
by John in CR
Aug 02 2020 4:46pm
Forum: E-Bike General Discussion
Topic: Cycle Analyst V3 CA3 no display after firmware update
Replies: 6
Views: 77

Re: Cycle Analyst Setup Utility

curlyblondlover wrote:
Aug 02 2020 12:56pm
Suggestions please?
Free yourself from the Apple cult.
by John in CR
Jul 30 2020 8:17pm
Forum: General Discussion
Topic: Just had an earthquake in Los Angeles
Replies: 118
Views: 13554

Re: Just had an earthquake in Los Angeles

English needs 2 words like in spanish. 4.2 is just a bit of a wiggle, which we call a "tremblor" , like the 4.4 we had off the pacific coast yesterday. AFAIC the small ones like that the more the better, so pressure is being released. The word for the big ones we don't want is "terremoto" . To me th...
by John in CR
Jul 29 2020 11:10am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2430

Re: ”The barge” efoil build

larsb wrote:
Jul 25 2020 9:33am
I smacked into the water like 50 times so i feel quite beat up but still extremely happy with this build
Congrats on getting it flying. We've gotta come up with a multi-foil design that flies with stability but still leans to turn, something anyone can ride.
by John in CR
Jul 28 2020 7:58pm
Forum: E-Bike General Discussion
Topic: UK will be electric bike capital of the world!
Replies: 43
Views: 884

Re: UK will be electric bike capital of the world!

"UK will be electric bike capital of the world!"

LOL!!!
by John in CR
Jul 27 2020 8:09pm
Forum: E-Bike General Discussion
Topic: Why fat tires on a street ebike?
Replies: 81
Views: 2111

Re: Why fat tires on a street ebike?

Why fat tires on a street ebike?

Only for their looks, and to me only the kids size with the 20" fatties look cool. Big mooshy (compromised safe handling) air brake high rolling resistance low speed limit tires have no good place on a street ride. In soft sand or snow sure, but otherwise a big no.
by John in CR
Jul 26 2020 7:59pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1407
Views: 146554

Re: Nucular electronics - complete kit for ev! [beta]

This will be the first time I update firmware, so I will check first that the new ones (display and controller) are later than the exist versions in the display and controller. My question is does it retain all of my existing settings, so I don't have to worry about wheel off the ground as well as w...
by John in CR
Jul 26 2020 6:49pm
Forum: Motor Technology
Topic: Greentime controllers
Replies: 992
Views: 132381

Re: Greentime controllers

On my controller it acts the same way, both hbrake and low brake do the same. On my bike, it takes 12vdc, because basically it taps into rear brake light. Enabling eabs would mean regen braking, if you don't have that enabled, it just cuts off motor power. Exactly. Ebrake low is just a short to bat...
by John in CR
Jul 26 2020 6:42pm
Forum: Motor Technology
Topic: Leafmotor 2000w
Replies: 14
Views: 319

Re: Leafmotor 2000w

...I'll reiterate: when you know the voltage and power you're working with, using a slower motor winding will give you more range, better climbing, and a lower top speed. This is true and you know it. That's the most ridiculous set of qualifications I've seen anyone use on ES to try to prove their ...
by John in CR
Jul 26 2020 2:19pm
Forum: Motor Technology
Topic: Leafmotor 2000w
Replies: 14
Views: 319

Re: Leafmotor 2000w

...I'll reiterate: when you know the voltage and power you're working with, using a slower motor winding will give you more range, better climbing, and a lower top speed. This is true and you know it. That's the most ridiculous set of qualifications I've seen anyone use on ES to try to prove their ...
by John in CR
Jul 25 2020 3:45am
Forum: Motor Technology
Topic: Leafmotor 2000w
Replies: 14
Views: 319

Re: Leafmotor 2000w

... You'll get more range and better climbing with a slower winding, but at the expense of cruise speed.... These kinds of statements are patently incorrect. You surely knew I was talking about using the same battery and controller, because I said so in the part of the paragraph you trimmed out. Bu...
by John in CR
Jul 25 2020 3:07am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 1972 Honda CB350F conversion process
Replies: 12
Views: 805

Re: 1972 Honda CB350F conversion process

Nice ebike. How are you making 100% sure those battery poles can't make contact with the metal side covers? I would absolutely use plastic, wood, or composite side covers...anything except metal or carbon fiber (since it's electrically conductive too).
by John in CR
Jul 25 2020 2:52am
Forum: Motor Technology
Topic: Leafmotor 2000w
Replies: 14
Views: 319

Re: Leafmotor 2000w

... You'll get more range and better climbing with a slower winding, but at the expense of cruise speed.... These kinds of statements are patently incorrect. Otherwise identical motors wound to different Kv's are capable of identical performance (speed, torque, efficiency, hill climbing, etc.) They...
by John in CR
Jul 25 2020 2:43am
Forum: Motor Technology
Topic: Leafmotor 2000w
Replies: 14
Views: 319

Re: Leafmotor 2000w

Long slow steep climbs are not the domain for any direct drive motor without gearing them down with either a small wheel or getting them out of the wheel and using a gear reduction. It is very load dependent though, as light people can get away with much more before heat problems arise. The Kv of th...
by John in CR
Jul 25 2020 1:13am
Forum: E-Bike Technical
Topic: Need a list of Ebike electrical components I may have missed for my build
Replies: 19
Views: 310

Re: Need a list of Ebike electrical components I may have missed for my build

Ebike tester - a cheap tool that performs simple functions not easily duplicated that is of great use to diagnose ebike problems that is often a process of elimination. eg Is the throttle working? are all 3 of the hall sensors functioning? is there a short in the motor phases? Jumper wires with alli...
by John in CR
Jul 25 2020 1:05am
Forum: E-Bike Technical
Topic: Splicing an 8 conductor motor wire: how to make an elegant slender splice?
Replies: 7
Views: 205

Re: Splicing an 8 conductor motor wire: how to make an elegant slender splice?

They make high performance heat shrink also, I use it on boat wiring. High temp glue lined, 3 to 1 shrink ratio. 51Ou2mga04L.jpg Thanks for pointing that stuff out, since I didn't know it existed. That's a must buy for me, and will actually save me time and money with less double shrinking and no n...
by John in CR
Jul 24 2020 11:31am
Forum: E-Bike Technical
Topic: Splicing an 8 conductor motor wire: how to make an elegant slender splice?
Replies: 7
Views: 205

Re: Splicing an 8 conductor motor wire: how to make an elegant slender splice?

They make high performance heat shrink also, I use it on boat wiring. High temp glue lined, 3 to 1 shrink ratio. 51Ou2mga04L.jpg Thanks for pointing that stuff out, since I didn't know it existed. That's a must buy for me, and will actually save me time and money with less double shrinking and no n...
by John in CR
Jul 24 2020 11:26am
Forum: E-Bike Technical
Topic: Splicing an 8 conductor motor wire: how to make an elegant slender splice?
Replies: 7
Views: 205

Re: Splicing an 8 conductor motor wire: how to make an elegant slender splice?

I typically go the route AW said with the staggered cut and splice points, but rarely end up with something I'd call elegant. To me the way to get it truly elegant and exactly the right length is to cut the harness at the appropriate point(s) and redo the connector(s) at the end.
by John in CR
Jul 23 2020 11:58pm
Forum: E-Bike Reviews & Testing
Topic: Arrow-7 Review... NYC's most prevalent eBike
Replies: 35
Views: 28131

Re: Arrow-7 Review... NYC's most prevalent eBike

Through the Chinese manufacturers and wholesalers sites that I've been a member for over a decade, there are literally hundreds, if not thousands, of ebike models priced in the $300-600usd range, and unlike just a few years ago almost all of them have lithium batteries. Of course that's bulk order ...
by John in CR
Jul 22 2020 8:49pm
Forum: E-Bike Reviews & Testing
Topic: Arrow-7 Review... NYC's most prevalent eBike
Replies: 35
Views: 28131

Re: Arrow-7 Review... NYC's most prevalent eBike

there's a wide range of solid ebikes in the $400-600 cost range. Can you give examples? Heck, I’d even be interested in a solid lightweight ebike conversion kit for $400-600, not sure how that’s possible, as em3ev batteries start at $275!! em3ev sells batteries only to customers outside of China, n...
by John in CR
Jul 21 2020 5:54pm
Forum: Battery Technology
Topic: Adjustable voltage Li-ion battery pack chargers - why uncommon?
Replies: 13
Views: 373

Re: Adjustable voltage Li-ion battery pack chargers - why uncommon?

Adjustable voltage chargers for lithium packs are uncommon, because most consumers can reliably be considered retards, and setting the charger at the wrong voltage can easily kill a battery pack or worse, start a fire.
by John in CR
Jul 21 2020 5:47pm
Forum: Battery Technology
Topic: Most foolproof chemistry for cold weather use?
Replies: 24
Views: 504

Re: Most foolproof chemistry for cold weather use?

Keep the ebike inside in reasonable temps, not a freezing garage. Charge only while he can monitor it, since it's indoors. Then install the pack in a manner so that it's well insulated, so the inherent heat created during discharge keeps it warm enough to obtain full capacity. When weather is warmer...
by John in CR
Jul 21 2020 5:40pm
Forum: Battery Technology
Topic: Automatic Fire Ball Extinguisher?
Replies: 36
Views: 668

Re: Automatic Fire Ball Extinguisher?

To avoid fires mount your battery pack made of quality cells securely and semi-permanently to your ebike with protection to prevent damage from a crash. Then use conservative charge and discharge levels, as well as monitor proper balance, and you won't have a fire. Copious amounts of water to dissip...
by John in CR
Jul 21 2020 9:07am
Forum: E-Bike Reviews & Testing
Topic: Arrow-7 Review... NYC's most prevalent eBike
Replies: 35
Views: 28131

Re: Arrow-7 Review... NYC's most prevalent eBike

I can't believe how people are flipping out about that bike at $1500+ . That's a sub $100 motor including controller, a $200-250 battery, a $15 charger, on a $100 bike and to be generous throw in another $100 for miscellaneous stuff. A shitton of them will fit in a container so shipping is next to n...