Search found 7307 matches

by Alan B
Apr 23, 2018 3:05 pm
Forum: Battery Technology
Topic: Bluetooth 10-15s bms review
Replies: 40
Views: 2057

Re: Bluetooth 10-15s bms review

That could provide a good value if it is a true 4 wire connection that only involves the FETs voltage drop. Ideally this would be measured on the die with separate bonding wires, this measurement made externally will include all the resistances of the leads and bond wires. The best we can do is to m...
by Alan B
Apr 23, 2018 2:53 pm
Forum: E-Bike General Discussion
Topic: Active pre-charge/inrush control
Replies: 706
Views: 58312

Re: Active pre-charge/inrush control

The dangers of trusting provided component layout libraries...
by Alan B
Apr 23, 2018 2:51 pm
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 39
Views: 1161

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

The varying load (due to the motor and driving conditions) and varying cosine angle to the sun of a solar panel array on an ebike is not consistent with the assumptions normally made when designing an MPPT controller. Of course the details depend on the algorithms chosen and the feedback parameters ...
by Alan B
Apr 23, 2018 12:07 pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 250
Views: 31960

Re: Sabvoton SVMC072150 controller review, variable regen *PICS*

On my setup it required both a switched signal and the variable signal. The switched signal did cut off the power (the throttle would not produce power), then the variable signal controlled the amount of braking (in addition to the settings in the controller).
by Alan B
Apr 23, 2018 5:17 am
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1983

Re: Is REGEN, really worth it ?

In the case of living on a hill and descending first, regen will not be available for this initial descent unless charging is reduced below 100%. But every other hill on the trip would be fine. As was suggested, charging to slightly lower max voltage, which is often done just for battery life, would...
by Alan B
Apr 23, 2018 12:25 am
Forum: E-Bike General Discussion
Topic: E bike Gearing Why Bother
Replies: 15
Views: 291

Re: E bike Gearing Why Bother

One gear for motoring, one for dead battery. Help it out on starts and steep hills. :)
by Alan B
Apr 23, 2018 12:13 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 97
Views: 1495

Re: The ultimate torque arm (For <2kW and standard axles)?

I never said the wedge lock took more torque to release than something else. I said it took more torque to release it than to stay where it is. Read carefully, sorry if I wasn't clear. Actually it looks pretty clear there. This behavior has been verified with experimental results personally every ti...
by Alan B
Apr 22, 2018 3:03 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 97
Views: 1495

Re: The ultimate torque arm (For <2kW and standard axles)?

Wedge Locking washers like the NordLock must engage the two faces on either side to work. [...] so to release the nut takes more torque than for it to stay where it is, Nope. With or without a softer surface to bite into, they release at a lower torque than an ordinary flat washer. WbLS3rGtKDM Chal...
by Alan B
Apr 22, 2018 2:18 pm
Forum: E-Bike General Discussion
Topic: Looking for people that own E-bikes
Replies: 24
Views: 448

Re: Looking for people that own E-bikes

My own preference is to get batteries that you can get serviced, or make your own battery. Shipping lithium batteries is difficult because they have caused planes to fall out of the sky. They can burn so fiercely that automated fire extinguishers cannot stop the blaze. Thus the rules governing their...
by Alan B
Apr 22, 2018 2:13 pm
Forum: E-Bike General Discussion
Topic: Looking for people that own E-bikes
Replies: 24
Views: 448

Re: Looking for people that own E-bikes

Not sure where you are located, good to put in at least general terms where you are into your settings so folks can use that to improve their suggestions. People differ on many things, but one thing everyone agrees on - no lead. At least on an ebike, a lithium battery is a game changer due to weight...
by Alan B
Apr 22, 2018 8:11 am
Forum: E-Bike Photos & Video
Topic: Cowardlyducks Commuter Build - E-bikeE
Replies: 286
Views: 36218

Re: Cowardlyducks Commuter Build - E-bikeE

So frustrating to discover the images missing, and so much work to fix.

You might consider uploading directly to ES, they have been very reliable, and it is very easy to do.
by Alan B
Apr 21, 2018 6:20 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

Small cells are like small chips. They only make sense until you know how to make big ones. It is a stopgap solution. It is surprising that Telsa is moving to rare earth magnets, this is not good for mass production or green manufacturing. The only reason is to increase the range slightly, at a cons...
by Alan B
Apr 21, 2018 6:09 pm
Forum: E-Bike General Discussion
Topic: The ebike parts designing thread with CAD/CAM
Replies: 119
Views: 4925

Cable Throttle to Ebike Throttle Voltage Converter

Another good project for 3D printing might be a cable throttle to voltage converter. Here's an example of a couple of different ones. Apparently the seller isn't making them anymore. The output voltage could be from a hall sensor or from a variable resistor, though the hall sensor should be easier t...
by Alan B
Apr 21, 2018 11:30 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1092
Views: 147592

Re: Compact Field Oriented Controller, ASI + Grin, limited run

Thanks for the glimpse of the future Justin, and know we'll be ready to help with testing. :)

I have very mixed feelings about the Higo connectors. They look nice but aren't something we can DIY on a piece of cable, as far as I've seen. If they are then where are the DIY kits?
by Alan B
Apr 21, 2018 11:16 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

With the resulting fire hazard we cannot tolerate dead cells in a pack. Which is easier to remove? One of many thousands of cells welded deep in a massive pack, or one of a couple dozen in a bolted set? The future is not moving toward more parts in the system. Tesla is making do with what is cheaply...
by Alan B
Apr 21, 2018 9:19 am
Forum: E-Bike General Discussion
Topic: Looking for people that own E-bikes
Replies: 24
Views: 448

Re: Looking for people that own E-bikes

Most folks on here have either built a few kit or scratch built ebikes, or they've bought a much smaller number of commercially built ones. It's hard to find folks with a wide perspective on the commercial bikes. The folks who have that are generally paid reviewers and their opinions may be swayed b...
by Alan B
Apr 21, 2018 8:39 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

Managing thousands of small cylindrical cells is a short term solution. None of the other carmakers seem to be interested in that. For the long haul much larger cells will take over and obsolete all the small cell systems. You have to decide what you want to own. If the technology is not stable, you...
by Alan B
Apr 21, 2018 7:30 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

You cannot tell from the price of a loss leader product.
by Alan B
Apr 21, 2018 12:19 am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 666

Re: Removable method of securing motor's axle nuts

Here's some real DIY testing of lockwashers (including NordLocks) in Australian. :)

Entertaining and informative. He shows how they don't work if the materials are too hard, and explains in some detail why and how they work.

by Alan B
Apr 20, 2018 11:11 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

They also have a huge edge in the cost of battery manufacturing where as the others have to outsource adding a huge cost. True, the gigafactory is their ace card at the moment. I think they will need to keep innovating or die - keep pushing the tech. Performance they have pretty much nailed, but ne...
by Alan B
Apr 20, 2018 10:35 am
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1983

Re: Is REGEN, really worth it ?

Looking at Regen alone isn't the whole question, unless you already have a DD motored bike, and are considering using DD or not there. The OP wasn't clear on this in the initial post. The initial poster, rumme, has made no other clarifications or comments in the thread that I found. Geared motors ar...
by Alan B
Apr 18, 2018 8:06 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 97
Views: 1495

Re: The ultimate torque arm (For <2kW and standard axles)?

Stooping to personal attacks? Wow. I expected better.

Well, you are wrong again. On so many counts.

Eventually you'll figure it all out.

Good luck.
by Alan B
Apr 18, 2018 3:38 pm
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1983

Re: Is REGEN, really worth it ?

what extra weight? A direct drive motor is heavier than a gear reduced free overrunning motor, all else equal. A battery that can store regen energy on demand is necessarily bigger and heavier than a battery sized only for the drive load, all else equal. Apples to oranges. Geared hubs can have rege...
by Alan B
Apr 18, 2018 3:37 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

It has been tried many times in business. Ultimately people burn out.
by Alan B
Apr 18, 2018 12:58 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 323
Views: 17914

Re: Tesla Model 3

One of the classic failures in project management comes from the practice of overworking salaried employees. They put in long hours that don't show in the costs and schedules. Then when making future estimates, all the cost and schedule history that is used for future projections is WRONG because th...