Search found 812 matches

by billvon
Apr 21, 2018 6:16 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 308
Views: 17633

Re: Tesla Model 3

In Germany battery systems from BYD, LG or Sonnen (for example) are cheaper (and most likely better) than a Powerwall II. Interesting. Here in the US they are much cheaper than their local competitors - Tesla PWII: $437/kwhr BattleBorn - $741 Panasonic RESU10 - $735 Iron Edison - $1225 SimpliPhi - ...
by billvon
Apr 21, 2018 6:09 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 308
Views: 17633

Re: Tesla Model 3

Alan B wrote:
Apr 21, 2018 11:16 am
With the resulting fire hazard we cannot tolerate dead cells in a pack.
Why? Once the fusible link is blown and the cell is at zero volts, why is there a fire hazard?
by billvon
Apr 21, 2018 5:56 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1847
Views: 49296

Re: Wind and Solar vs Coal, Gasoline, Nuclear

... His was a "calculation". ( or Theory in other words) not even using his own data , and not from experimental work. And if you are so well informed, you should also know that his calculation (theory) has been criticised by many for its lack of rigor and omission of such factors as cloud influenc...
by billvon
Apr 21, 2018 12:48 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 308
Views: 17633

Re: Tesla Model 3

I don't think the data backs up that statement. Tesla now has the cheapest to manufacture battery in the EV world. What data do you have to substantiate that statement.? Cost of the Powerwall. It has the lowest $/kwhr of any lithium based home power storage system. (And uses the same technology/ass...
by billvon
Apr 21, 2018 12:46 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1847
Views: 49296

Re: Wind and Solar vs Coal, Gasoline, Nuclear

There has never been a verified, controlled , repeatable, scientific experimment, to quantify , Or even measure, the "Greenhouse effect" of CO2 The first one was in 1896. Svante Arrhenius used data on IR losses through the atmosphere (taken by Samuel Pierpont Langley and Frank Washington Very at th...
by billvon
Apr 20, 2018 1:42 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1847
Views: 49296

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Since when is questioning unproven "scientific" statements considered trolling ? Do you realise how much you sound and behave like those arcitypal fanatical characters with "sandwhich boards" on claiming.."THE END OF THE WORLD IS NYE". you should not accept everything you read/hear without question...
by billvon
Apr 19, 2018 6:01 pm
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 33
Views: 1021

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

Yeah, since it's a rooftop canopy I can't see any advantage to doing anything other than a perfectly flat panel with all the cells on exactly the same plane and getting the same incident light. Curved panels arguably look better, but in this case make little sense. That makes things a lot easier (s...
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: 33
Views: 1021

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: 33
Views: 1021

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: 79

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: 308
Views: 17633

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: 308
Views: 17633

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: 253

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: 253

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: 1307

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: 6669

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: 253

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: 159

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: 159

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: 5737

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: 308
Views: 17633

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: 206

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: 275

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: 5737

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: 5737

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.