Search found 1793 matches

by billvon
Apr 04 2018 4:49pm
Forum: E-Bike Technical
Topic: 2 chargers in paralel...cool?
Replies: 2
Views: 222

Re: 2 chargers in paralel...cool?

I can get 2X2a 36V (42v) chargers for less than $20, while the 4a is $50. I already have a 2a, so any reason I can't buy another (they should be exactly the same charger) and put them together in parallel to make a 4a charger? During constant current charging they should "play well" together. As so...
by billvon
Apr 04 2018 12:23pm
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 144
Views: 7383

Re: Supercapacitors vs batteries. Capacity.

But if this is a con, it's a very strange one. To be clear, I am not saying it's a con. They may well truly believe in their product. But again, I have seen a lot of technologies over the years fail not because they were lying about it, but because of a hidden flaw, a lack of sufficient differentia...
by billvon
Apr 03 2018 5:32pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 190
Views: 24609

Re: The end of BionX?

I mean, at some point, you could hack enough crap onto the system to make it sort of work, but the draw of BionX, at least in my experience, is the integrated system. Having one console over here, another one for monitoring the battery, no regen, etc... not going to be popular among the crowd that ...
by billvon
Apr 03 2018 5:04pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 190
Views: 24609

Re: The end of BionX?

This will work, sort of, but you won't have any battery status indication on the console, will have error codes, and if I had to guess, I'd say it would probably disable regen without any clue how full the battery is (to avoid overfilling a battery). So add a cycle analyst. Basically, all the 48V s...
by billvon
Apr 03 2018 4:12pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 190
Views: 24609

Re: The end of BionX?

Car people exemplify the very worst and weakest things about us. Just get out on the street as a human being and see for yourself. To me, you might as well ask why serial killers do the things the way they do. Which is equivalent to saying "consumers exemplify the very worst and weakest things abou...
by billvon
Apr 03 2018 2:14pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 190
Views: 24609

Re: The end of BionX?

This isn't a new lesson to learn. Sanyo, SRAM, Wavecrest, and others have entered and left the e-bike market already with more or less proprietary systems. Approximately nobody is still using them. Some modular equipment from the same time periods is still in service. Some contemporary manufacturer...
by billvon
Apr 03 2018 10:52am
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 144
Views: 7383

Re: Supercapacitors vs batteries. Capacity.

It's going to be mildly amusing to watch the naysayers here backtrack when this turn out to be exactly what they say it is. That would be great, but unlikely. I designed my first lithium ion battery pack back in 1996; I used 1300mah 18650's (the best cells on the market at the time.) Since then I c...
by billvon
Apr 02 2018 11:00pm
Forum: Battery Technology
Topic: Mixing lipo and lithium ion batteries
Replies: 2
Views: 432

Re: Mixing lipo and lithium ion batteries

Lithium ion batteries have high specific energy and lipo have high c rating (high power). Is it possible to put lipo and lithium-ion batteries in parallel if they are at the same voltage and protected by charge control or BMS circuitry? Sure. I've done it with both Lipo+LiFePO4 and Lipo+NiMH. As lo...
by billvon
Apr 02 2018 3:34pm
Forum: General Discussion
Topic: Small Solar Proposal
Replies: 60
Views: 2749

Re: Small Solar Proposal

The data was from Environment Canada and what it stated was "peak sun hours of 6 per day, average, for that area in June. We measure about 1000 watts/square meter in the area so I equated it to that. I then tacked on an hour on each side of that for the other 12 hours of daylight and a PMMT. Perhap...
by billvon
Apr 02 2018 1:04pm
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 144
Views: 7383

Re: Supercapacitors vs batteries. Capacity.

In that video HillHater posted that guy talks about the fact that these li-caps have a constant voltage like a battery and don't massively drop like a traditional capacitor. And again emphasizes its an electrostatic charge and not an electrochemical charge like a traditional battery. Those two sent...
by billvon
Apr 02 2018 1:02pm
Forum: General Discussion
Topic: Small Solar Proposal
Replies: 60
Views: 2749

Re: Small Solar Proposal

I found data showing >1000 watts per square meter, 6 hours per day on average for that area, at that time of year. That is very, very unlikely. I have never seen a location (outside of some extreme cases, like high altitude glaciers) where you get >1000 watts per square meter for any length of time...
by billvon
Apr 02 2018 12:44pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

bill von, while i agree cars have gotten better maintenance wise paint on new cars is super thin and chips/ scratches easily My first car (inherited from father) was a silver 1973 Datsun 610. By the time I got it it had 100K miles on it and was gray and brown; the paint was falling off and it was r...
by billvon
Apr 02 2018 12:27pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

Todays autos cost relatively twice as much or more than that 50-70s era,.... Not really. Average cost of a car in 1968 was around $23,000 (in 2016 dollars) - 2016 average cost was around $25,000. yes, we get twice the miles (or more) of use from them, somewhat more dependable, less maintenance, don...
by billvon
Apr 02 2018 11:52am
Forum: Items Wanted
Topic: Eplus
Replies: 3
Views: 285

Re: Eplus

miro13car wrote:
Apr 02 2018 11:23am
EPLUS E+ electric bike working or dead or any parts for EPLUS.
Do you want them? Are you trying to sell them?
by billvon
Mar 30 2018 9:38pm
Forum: E-Vehicles General Discussion
Topic: Tesla crash Mountain View California
Replies: 54
Views: 2829

Re: Tesla crash Mountain View California

markz wrote:
Mar 30 2018 6:19pm
If a driver takes control of the vehicle, autopilot should be off no matter what.
It is. If you do more than nudge the steering wheel the autopilot disconnects. (Also if you touch the brake.)
I dont think autopilot should over ride manual operation.
It doesn't.
by billvon
Mar 30 2018 9:36pm
Forum: E-Vehicles General Discussion
Topic: Tesla crash Mountain View California
Replies: 54
Views: 2829

Re: Tesla crash Mountain View California

If he complained that the auto pilot malfunctioned at that spot repeatedly then he used it many times at that spot. Not such a big assumption that he was using it his last time. It would be just even safer to assume that since it malfunctioned there, he no longer used it in that area. It would be u...
by billvon
Mar 30 2018 5:03pm
Forum: E-Vehicles General Discussion
Topic: Tesla crash Mountain View California
Replies: 54
Views: 2829

Re: Tesla crash Mountain View California

e-beach wrote:
Mar 30 2018 1:33pm
He trusted technology too much. The poor guy.
That's assuming that the autopilot was on (which is a big assumption.)
by billvon
Mar 29 2018 9:26pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

Even the basic flooded wet-cell batteries have benefited from recent technologies, and are far better than in their former basis of the not so distant past. Of course glass-mats and gels can hardly be called an advancement given their "disposable" nature of a relatively short life due to consumers ...
by billvon
Mar 29 2018 9:20pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

Correct me if I'm wrong, but isn't petrol necessary for electricity production? Petrol as in oil? Not here. The only place the US uses oil for electrical power to any degree is Hawaii because that's the only fuel we can ship there. Petrol as in any fossil fuel? Depends where you are. Here in San Di...
by billvon
Mar 29 2018 6:00pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

I was considering cutting the cord to the power company completely. I am not even sure if they allow you to upload power to the grid in Italy. For a much lower cost (and lower hassle) way to do that consider a "net zero export" grid tie system. It is a system that will never export power to the gri...
by billvon
Mar 29 2018 11:23am
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

Why not use your own solar panels to charge your battery? Just one 4' x 2' solar panel can easily charge a 48v 20ah battery in a day (generates up to 200w per hour). Get a few panels and you can power your home lighting and maybe even the movie projector too :) That's what we do. Although usually t...
by billvon
Mar 28 2018 11:58am
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

An electric car is not much greener than a combustion car. Unless it is half the weight and size, it is not a significative improvement. I think it's a pretty significant improvement in terms of energy and resource usage, but it's not a complete solution - just another step along the path to "bette...
by billvon
Mar 27 2018 4:11pm
Forum: Alternative Energy
Topic: An off-grid install in the city
Replies: 18
Views: 1707

Re: An off-grid install in the city

Or just buy a 24 volt / 48 volt fridge. Only has to keep a carton of beer cold :) That is mission critical, agreed. Generally DC fridges tend to be pretty expensive (low demand.) Peltier junction (car) fridges are tempting but are horrendously inefficient. If you are going to go the DC route, consi...
by billvon
Mar 27 2018 2:08pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

Yep. I was talking about the world. The use of cars is spreading in countries that are very populated. Our way of life, that is abusing resources to the point of making them pay by our grand children, will crash. Those who believe it can last forever, are dreaming. I think it will change, not "cras...
by billvon
Mar 27 2018 1:06pm
Forum: E-Bike General Discussion
Topic: Could Electric Bikes Be Killing Off America’s Car Addiction?
Replies: 79
Views: 2698

Re: Could Electric Bikes Be Killing Off America’s Car Addiction?

Total U.S. gasoline consumption has (on average) stayed about the same over the last 20 years despite substantial increases in population. Per capita consumption is on a generally downward trend in the U.S. Yep. The substantial increases in efficiency have largely counteracted the increase in miles...