Search found 3052 matches

by speedmd
May 25 2022 6:55am
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89348

Re: gas price thread

Agree, hard to generalize with all the factors. Looks like much of the potential savings are in the margins (paying as little as possible and doing a bunch of work on your own) and charging direct certainly a big advantage. For most of my driving (mostly parked at home all day), it could potentially...
by speedmd
May 24 2022 10:09pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89348

Re: gas price thread

Anyone know the avg cost out in $/kwh for the average home roof top setup if you can afford the roof? Running around $3/watt. In Cali, the best selling cars now are the Mod Y and Mod 3. @ 21812, 21506 units. Rav4 was third @15990. Anyone know the avg cost out in $/kwh for the average home roof top ...
by speedmd
May 24 2022 7:54am
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89348

Re: gas price thread

In Cali, the best selling cars now are the Mod Y and Mod 3. @ 21812, 21506 units. Rav4 was third @15990. Anyone know the avg cost out in $/kwh for the average home roof top setup if you can afford the roof? :lol:
by speedmd
May 23 2022 8:19pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89348

Re: gas price thread

BYD Seagull $9000 -12000 USD. Next gen LFP Blade battery. Deliveries latter this year.
Image
by speedmd
May 10 2022 10:20am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1819
Views: 289677

Re: Thread for new battery breakthrough PR releases

Good video summary on "graphene" potential starting 2'30".

https://www.youtube.com/watch?v=iEzgNh50-1w
by speedmd
May 10 2022 10:12am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1819
Views: 289677

Re: Thread for new battery breakthrough PR releases

More on Theion li sulfur graphene battery construction and growing a crystal structure vs slurry construction. https://www.chemengonline.com/sulfur-batteries/
by speedmd
May 06 2022 7:39am
Forum: Battery Technology
Topic: When will 4680 cells be available to the public?
Replies: 38
Views: 1938

Re: When will 4680 cells be available to the public?

Certainly if your looking to pack every nook and cranny with active material, the flat pack has advantages to the can style builds. But if fast charge - discharge is premium, the continuous tab design of the 4680 with closer proximity to active layers and vast connection points should have some majo...
by speedmd
May 04 2022 12:49pm
Forum: Battery Technology
Topic: When will 4680 cells be available to the public?
Replies: 38
Views: 1938

Re: When will 4680 cells be available to the public?

WHO will win the Battle between Tesla (Musk) and the BIG BOYS (cyclindrical cell vs pouch cell)? Musk may find out that even his new lithium 4680 doesn't offer the right competitive muster as does the lithium pouch cell for cars. Is there even one other major car manufacturer in the world that uses...
by speedmd
May 03 2022 8:32am
Forum: Battery Technology
Topic: When will 4680 cells be available to the public?
Replies: 38
Views: 1938

Re: When will 4680 cells be available to the public?

Tesla Fans reporting :lol: that Berlin factory will shut down for three weeks to switch over from 2170 cells to the 4680 cells. No date announced but some time this year. Claim also that all models will switch over in 2023. Also noted a new brand working with them on a 5 min to 80% cell charge. http...
by speedmd
May 03 2022 8:15am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

We could eliminate the speed throttle all together if speed ramps could be fed back to limit current control in some way. Much like traction control works on some systems. Once a specified amount of slip is detected, the speed is not increased significantly. Time (Ramps), intensity, and slip angles ...
by speedmd
May 02 2022 7:41am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

Using the clutch lever to switch modes could be valuable but simple speed throttle is pretty twitchy and accelerates an unloaded wheel violently. At least on high amp cheap older controllers. The throttle would default to speed only when clutch is pulled. You would tame the twitchy behavior (mostly...
by speedmd
May 02 2022 7:33am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

Using the clutch lever to switch modes could be valuable but simple speed throttle is pretty twitchy and accelerates an unloaded wheel violently. At least on high amp cheap older controllers. The throttle would default to speed only when clutch is pulled. You would tame the twitchy behavior (mostly...
by speedmd
May 01 2022 5:42pm
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

So I can't work out what actually signals the switch between modes. Thinking, when clutch level is out (fully engaged), you would be in current throttle mode. As soon as you pull the lever, it would default to speed throttle. When pulled, you are effectively limiting torque (current) drive force wi...
by speedmd
May 01 2022 9:40am
Forum: Battery Technology
Topic: When will 4680 cells be available to the public?
Replies: 38
Views: 1938

Re: When will 4680 cells be available to the public?

I would be surprised if we do not see significant improvements in drivability. The structural pack is claimed to be significantly stiffer which should add torsional and bending stability to the body. Also adding the nicely cored out large one piece aluminum cast front motor- suspension structure wit...
by speedmd
Apr 29 2022 7:55am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

speedmd wrote: ↑Apr 28 2022 12:24pm Given the much higher torque of the electric motor at low rpms, they should (spin up the flywheel faster) be able to out perform the ICE setup with equal rotating mass. Therein lies the problem - you don't want it to spin up too fast. It's one of the problems peo...
by speedmd
Apr 28 2022 11:24am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

I'm still hung up on the idea that if a controllers current ramp is too slow then dumping the clutch wont increase the instant power hit without a flywheel at least equal or more massive as its ICE counterpart. Ultimately the controller gets the final say regarding the time it takes the torque to r...
by speedmd
Apr 28 2022 10:17am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1819
Views: 289677

Re: Thread for new battery breakthrough PR releases

Another article on the porous carbon/sulfur composite cathode. Grandma always said, everything is a bit better with a bit of sugar. :D
https://www.sciencedirect.com/science/a ... 1122002645
by speedmd
Apr 28 2022 8:38am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

So it seems that effectively the EM is running a ratio well up around 5th on an ICE bike. No wonder it tends to be underwhelming off the clutch! Dropping the clutch at 7000rpm in 5th gear on the Beta would be positively leisurely. Interesting. I'd love to see how an EM rode with a huge rear sprocke...
by speedmd
Apr 26 2022 8:17am
Forum: Battery Technology
Topic: When will 4680 cells be available to the public?
Replies: 38
Views: 1938

Re: When will 4680 cells be available to the public?

What I am seeing in reports, is that Tesla is currently planning on switching over to the 4680 in the US Mod Y later in the year and other models as supply can hold. Leaks showed only a small pre production batch of cars went to employees just recently with them. No word on exact chemistry in the ca...
by speedmd
Apr 26 2022 7:41am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 174
Views: 14551

Re: Observed trials bike designing

Vertigo looks like a very nice bike. I have a Sherco 290 which does get away from me at times :oops: . Would like to try a modern 250 to compare. Most likely a 250 would be a better fit for my level of riding. I am not seeing any reasonably priced used bikes anywhere around. Good points on the flywh...
by speedmd
Apr 23 2022 8:45pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1819
Views: 289677

Re: Thread for new battery breakthrough PR releases

Berlin-based Theion, a developer of lithium-sulfur cathode technology, appointed Dr. Ulrich Ehmes as CEO and announced the upcoming commercial availability of its Crystal Battery for applications, beginning with the aerospace sector. Dr. Ehmes, who has a long track record of industrializing battery...
by speedmd
Apr 21 2022 7:09am
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 248
Views: 38918

Re: Chevy Bolt first drive

Battery university did some summary of various charge discharge cycle scenarios. https://batteryuniversity.com/img/content/DST-cycles-web2.jpg batteryuniversity.com/img/content/DST-cycles-web2.jpg for some reason image is not posting? Figure 6 illustrates dynamic stress tests (DST) reflecting capaci...
by speedmd
Apr 20 2022 1:28pm
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 248
Views: 38918

Re: Chevy Bolt first drive

What's the mileage lifespan of the typical battery on an electric car? With or without Thermal management? Climate and average SOC also important questions. Saw a Model 3 drivers posting pack capacity of his with 200K miles with better than 80% of initial stock capacity. I have not heard of any of ...
by speedmd
Apr 19 2022 9:59am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1819
Views: 289677

Re: Thread for new battery breakthrough PR releases

The battery "investment" side, is talking up "Nanopowder" as the latest greatest development in potential higher energy density Li batteries. Following a few of the links so far has led to technical dead ends for real details. Graphene and silicon blends were noted on several non...
by speedmd
Apr 15 2022 7:54am
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89348

Re: gas price thread

ultimately it's all about power Exactly! :lol: In many more ways than one. BTU/gal, $/KW, wholesale vs retail costs (price at pump -charger). The entire refining and generation industries are under significant strain with high rates of independent generation capacity coming online. Unfortunately fo...