Search found 805 matches

by billvon
Apr 18, 2018 1:18 am
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 32
Views: 890

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

MPPT controller is like 10x in complexity (part count) and 1/10x in reliability of PWM and like infinitely unreliable compared to direct system ex. diode. Well, no. A direct system also requires a switch (or linear regulator) to prevent overvoltage. And linear regulators add the complication of the...
by billvon
Apr 17, 2018 3:48 pm
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 32
Views: 890

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

Oh awesome. Those cells are less expensive than I was expecting. It wasn't quite on the radar to build up a panel from scratch cells but you've got me is tempted by this for both a) the DIY aspect, and b) the possibility to configuring them in a series string that is effectively optimized for max p...
by billvon
Apr 16, 2018 10:01 pm
Forum: General Discussion
Topic: Help me ID this controller and what voltage I can use it with
Replies: 5
Views: 69

Re: Help me ID this controller and what voltage I can use it with

unclejemima wrote:
Apr 16, 2018 9:44 pm
If the battery has a bms and it physically works...what’s the worst that can happen???
Overcurrent. Unexpected LVD or HVD. Controller burnout (if phase resistance/inductance is different than what the controller expects.)
by billvon
Apr 16, 2018 5:46 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 277
Views: 16771

Re: Tesla Model 3

I work and buy plenty . . . . Do you work for free, and buy materials at the highest possible cost? and would way rather see every penny possible getting reinvested into scaling the mfg volume while demand is currently effectively unlimited. So would I (and I have Tesla stock as well.) But that's b...
by billvon
Apr 16, 2018 12:56 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 277
Views: 16771

Re: Tesla Model 3

liveforphysics wrote:
Apr 14, 2018 11:36 pm
Who even cares about profits?
Pretty much everyone who works, or buys stuff.
by billvon
Apr 11, 2018 10:16 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Off-road EV idea... need lots of help
Replies: 12
Views: 218

Re: Off-road EV idea... need lots of help

I think 15 mph would be good. As far as rocks I'm not thinking anything huge mainly what you might find on a trail as far as rolling over. And for steepest slope between 15% and 20% grade to tackle the more difficult climbs. Sounds like you want a geared hub without a clutch then. They are not read...
by billvon
Apr 10, 2018 11:43 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Off-road EV idea... need lots of help
Replies: 12
Views: 218

Re: Off-road EV idea... need lots of help

I hope the pictures work. My plan is to have the wheel on the outside. My current model is very crude but might work for a base model. In my sketch the boot strap holds the foot an undecided distance above the stub. With the stub attached to "jumping stilts" assembly. To assist with hopping and giv...
by billvon
Apr 10, 2018 6:06 pm
Forum: E-Vehicles General Discussion
Topic: Tesla crash Mountain View California
Replies: 50
Views: 1278

Re: Tesla crash Mountain View California

TheBeastie wrote:
Apr 08, 2018 6:55 am
Obviously, Tesla/Uber management/engineers decided to just put these cars out and see how many people they kill before it becomes a problem.
Probably. Every other car company out there has done the same.
by billvon
Apr 10, 2018 3:12 pm
Forum: Motor Technology
Topic: Sine VS Square wave efficancy?
Replies: 50
Views: 6584

Re: Sine VS Square wave efficancy?

eCue wrote:
Apr 10, 2018 2:39 pm
This video demonstrates that square wave starts out rough/ noisy and smooths out as frequency is increased.
That's due to the (probably unintentional) filtering provided by the signal generator and test setup.
by billvon
Apr 10, 2018 11:36 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Off-road EV idea... need lots of help
Replies: 12
Views: 218

Re: Off-road EV idea... need lots of help

My main concern is the side mounted wheels. My weight being held by only one side of the wheel. Is there a high possibility of breaking the hubs? Nope. Plenty of stub axle designs are way more durable than your tibia. (i.e. your leg will break before the axle.) I plan on putting these through rigor...
by billvon
Apr 09, 2018 2:57 pm
Forum: E-Bike Technical
Topic: Power keeps shutting down
Replies: 8
Views: 154

Re: Power keeps shutting down

327ren wrote:
Apr 09, 2018 2:54 pm
Hey guys thanks for the replies. There’s another fact I forgot to mention: the 48 volt battery has a reading of 56 volts when fully charged.
That's common (and expected.) 48 volts is nominal voltage, not max (or min) voltage.
by billvon
Apr 09, 2018 1:02 pm
Forum: E-Bike Technical
Topic: Power keeps shutting down
Replies: 8
Views: 154

Re: Power keeps shutting down

However, tne wheel would not turn smoothly. When I disconnected the green phase wire, the wheel turns smoothly. When I reconnect it, it turns rough. Please help! I already sunk $275 into repairs and cannot afford more! What's going on here? Yep, blown FET. If you are lucky it was just a bad part an...
by billvon
Apr 09, 2018 12:37 pm
Forum: E-Bike General Discussion
Topic: E-bike restricted trail access and hate
Replies: 185
Views: 5505

Re: E-bike restricted trail access and hate

"Must yeild to pedestrian in cross walk" Has gone way too far in my area. They painted a cross walk across a 4 lane state highway at the edge of town. Now the college students believe hey don't even have to look up from there phone to wait for a safe break in the traffic. They just walk right into ...
by billvon
Apr 09, 2018 12:34 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 277
Views: 16771

Re: Tesla Model 3

lester12483 wrote:
Apr 09, 2018 11:56 am
Ok so why are they deep in the red then?
See above; all that money is going into the next product.
by billvon
Apr 09, 2018 10:47 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 48v to 60v switch
Replies: 2
Views: 184

Re: 48v to 60v switch

I thought of a simple indicator switch that has 48v one side and 60v the other, so the switch is basically adding on the extra 12v battery then taking it away from the 48v, but the current just was too much for the switch and it burnt out. Very bad idea. You will end up with a badly unbalanced batt...
by billvon
Apr 08, 2018 4:17 pm
Forum: Battery Technology
Topic: Is regen still possible with this kind of bms?
Replies: 12
Views: 271

Re: Is regen still possible with this kind of bms?

However, regular overcharge at slightly higher voltage encourages dendrite growth, and this leads to battery fires eventually. True, but it's easier to prepare for that eventuality (design of battery containment, location of bike or vehicle parking/storage, etc) than any kind of sudden issue on the...
by billvon
Apr 08, 2018 4:09 pm
Forum: E-Bike General Discussion
Topic: E-bike restricted trail access and hate
Replies: 185
Views: 5505

Re: E-bike restricted trail access and hate

If you want to go faster than 20 mph, class three requires pedal operation. Right; that's the definition of class 3. I was just commenting on the idea that all non-car-drivers have to pedal. The other part is that the roads are generally not designed to accommodate cyclists well. Traffic signal sen...
by billvon
Apr 08, 2018 12:48 am
Forum: E-Bike General Discussion
Topic: E-bike restricted trail access and hate
Replies: 185
Views: 5505

Re: E-bike restricted trail access and hate

wturber wrote:
Apr 07, 2018 1:57 am
But it is sad that we must "keep the peace" with folks in heavy automobiles, trains, buses etc. who somehow think we should pedal while they don't have to?
I don't think anyone says "you have to pedal." Motorcyclists don't, and are 100% legal.
by billvon
Apr 08, 2018 12:34 am
Forum: Electric Watercraft
Topic: Inflatable Kayak 200w pv panels with trolling Motor
Replies: 7
Views: 274

Re: Inflatable Kayak 200w pv panels with trolling Motor

eCue wrote:
Apr 07, 2018 8:52 pm
To try and get the same efficiency ordered this 40A PWM with a on/off reverse switch.
You don't need both (new controller plus DC/DC.) A decent controller will limit to a max voltage.
by billvon
Apr 08, 2018 12:32 am
Forum: E-Vehicles General Discussion
Topic: NASCAR has announced it's going all-electric by 2021
Replies: 11
Views: 360

Re: NASCAR has announced it's going all-electric by 2021

So I'm picturing the Formula E approach where they switch cars. They'd need 10, because with their boot in it the whole way the Tesla would make 50 miles. Or maybe less. So allow fast charging. There are cells that will handle 50C charge rates now. And you can bet that if that's allowed, overnight ...
by billvon
Apr 08, 2018 12:28 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1823
Views: 48267

Re: Wind and Solar vs Coal, Gasoline, Nuclear

....Over all, 1,600 coal plants are planned or under construction in 62 countries, according to Urgewald’s tally, which uses data from the Global Coal Plant Tracker portal. The new plants would expand the world’s coal-fired power capacity by 43 percent. And even with all that - solar is growing fas...
by billvon
Apr 07, 2018 7:30 pm
Forum: Battery Technology
Topic: Is regen still possible with this kind of bms?
Replies: 12
Views: 271

Re: Is regen still possible with this kind of bms?

--sudden braking failure causing possible loss of control or collision with someone in front of me There's no "sudden braking failure." In unusual conditions (100% charge) you can lose regen, which is generally a small percentage of the total braking power available from your brakes. So you squeeze...
by billvon
Apr 06, 2018 11:00 pm
Forum: Battery Technology
Topic: Is regen still possible with this kind of bms?
Replies: 12
Views: 271

Re: Is regen still possible with this kind of bms?

First is that if the BMS cuts off the battery from the controller to protect it from overcharge during regen down a hill, the bike/etc will suddenly begin accelerating down the hill. Agreed - however - a two port BMS will often not protect the pack in such a manner. (i.e. the discharge port will ge...
by billvon
Apr 06, 2018 10:48 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1823
Views: 48267

Re: Wind and Solar vs Coal, Gasoline, Nuclear

We have built a staggering amount of things and a staggering amount of people over the last 150 years due to consuming a staggering amount of stored fossil energy. This one time gift will soon be leaving us, Long before we are ready to leave it. The biggest transition in human history will be force...
by billvon
Apr 06, 2018 5:00 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1823
Views: 48267

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Yes. And we will learn to control the weather to eliminate snow storms. Nope. Just use tracking mounts. Or get a snow removal robot. Or a guy with a broom. No need to "control the weather." And be able to build 3,000 more 600 MW solar plants and 10,000 more BigF'nBatteries just for the USA. Yep. We...