Search found 1587 matches

by billvon
Jan 21 2019 4:53pm
Forum: Battery Technology
Topic: High amp output bms
Replies: 6
Views: 82

Re: High amp output bms

I was a bit confused on the awg wire carrying capacity. On one page they say 4/0 can handle about only 250a, and on another welding awg chart, it says that for 600a at a 100% duty cycle you would need 2 1/0 wires, which wouldnt be to far from one 4/0 wire. Take a look links below. Im aware that len...
by billvon
Jan 21 2019 2:38pm
Forum: Battery Technology
Topic: High amp output bms
Replies: 6
Views: 82

Re: High amp output bms

Hey guys as you may or may not know ive been trying to figure out exactly which cells and what size battery back ill be doing for my build and ive concluded that i want to do a 20s 20p battery pack with 3000mah cells. And each cell is capable of 20A discharge continuous and 30A for a short few seco...
by billvon
Jan 21 2019 12:34pm
Forum: E-Bike Technical
Topic: [Help Requested] Reverse-Engineering an undocumented conversion kit
Replies: 18
Views: 275

Re: [Help Requested] Reverse-Engineering an undocumented conversion kit

gutyex wrote:
Jan 21 2019 12:23pm
It's more than simply detecting problems, because as I've said previously if it's set wrong the motor will not run correctly even at no load. I can upload a video demonstrating this if anyone is interested.
So what does it do? Run slowly? Just twitch at random? Do nothing?
by billvon
Jan 21 2019 12:22pm
Forum: Battery Technology
Topic: Toyota and Panasonic form huge battery R&D & production partnership
Replies: 7
Views: 213

Re: Toyota and Panasonic form huge battery R&D & production partnership

I think this sounds like a high up corporate decision, and not something sparked from an innovation in a lab. Solid state batteries were sparked from innovations in a lab. I can think of half a dozen players that contributed it to being a reality, from Goodenough to Ionic to Solid Power to MIT to 2...
by billvon
Jan 21 2019 12:06pm
Forum: E-Bike Technical
Topic: [Help Requested] Reverse-Engineering an undocumented conversion kit
Replies: 18
Views: 275

Re: [Help Requested] Reverse-Engineering an undocumented conversion kit

In that case I have no explanation for why the KT controllers require the P1 value to run properly, but I know from experience that they do. A few possible reasons: It uses the P1 signal to detect a stall, and when the motor stalls, it reduces/cuts power to prevent overheating. It uses the P1 signa...
by billvon
Jan 21 2019 12:44am
Forum: E-Bike Technical
Topic: [Help Requested] Reverse-Engineering an undocumented conversion kit
Replies: 18
Views: 275

Re: [Help Requested] Reverse-Engineering an undocumented conversion kit

other controllers can make do with just the phase wires & hall sensors because they are capable of FOC Most controllers are far simpler and do direct (i.e. combinatorial) control. When the Hall sensors say the motor is at angle 1, then output + + -, when at angle 2, output + - -, etc etc. No comput...
by billvon
Jan 20 2019 6:03pm
Forum: E-Bike Technical
Topic: [Help Requested] Reverse-Engineering an undocumented conversion kit
Replies: 18
Views: 275

Re: [Help Requested] Reverse-Engineering an undocumented conversion kit

The kit came with a C300 display (C300-1303-D601 36V). Given that these displays communicate via UART, is there some way I can hook it up to a PC and read the configuration from it to figure out the correct settings to use the motor with a KT controller? Unlikely. You'd have to get the original con...
by billvon
Jan 20 2019 12:05pm
Forum: Battery Technology
Topic: Toyota and Panasonic form huge battery R&D & production partnership
Replies: 7
Views: 213

Re: Toyota and Panasonic form huge battery R&D & production partnership

Good to see this. Solid state batteries are promising but that field of study is a very new one, and it will be great to see some bigger players get involved.
by billvon
Jan 19 2019 12:49pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

GDP is probably more closely correlated to useful energy CONSUMPTION now that efficiencies from electrification are starting to creep in. With the emphasis on "useful," yes. The main reason we have seen some energy uses per capita decline of late is due to that effect. When energy is cheap efficien...
by billvon
Jan 19 2019 11:13am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

sendler2112 wrote:
Jan 17 2019 3:17pm
Economy. energy, population, are correlated nearly 1:1:1.
Energy USED can be sorta correlated in that way. Energy EXPENDED cannot be.
by billvon
Jan 17 2019 5:53pm
Forum: Battery Technology
Topic: Why does my 12v charger output 24v?
Replies: 4
Views: 96

Re: Why does my 12v charger output 24v?

I have a black and decker 12v drill, and I wanted to use it’s charger for a custom 12v battery pack I built. I measured the voltage with my multimeter, and it shows and output of 24v (same as is labeled on the charger). Why is this? Is there some way this is safe for my battery? What chemistry is y...
by billvon
Jan 17 2019 5:45pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

sendler2112 wrote:
Jan 17 2019 5:37pm
And electrified heavy rail replacing diesel rail, cross country trucking and air freight.
Or electrified trucking using catenaries. That allows the US to continue their love affair with road-based transport and solves the last-mile problem at the same time.
by billvon
Jan 17 2019 11:23am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I don't think this will be an issue as we can make endless amounts of stationary energy that can be transferred through the grid to manufacture on a global scale Given the problems countries have with blackouts, high power prices and grid stability - I don't think that's true. And much of it depend...
by billvon
Jan 16 2019 6:41pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The day is still young, they can declare bankruptcy again. As a dozen solar companies have. That doesn't mean that the technology behind solar-PV is a failure - just that people made bad business decisions. As for Chinese... those guys operate under completely different parameters, I wouldn't try t...
by billvon
Jan 16 2019 6:39pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 38
Views: 620

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

So, for both types, units connected serially, need to be actively, explicitly balanced, whether done manually or automated. Not really. For serial connections of lead acid you just have to charge them. You can equalize charge if you want, but usually that's not needed due to the self-balancing aspe...
by billvon
Jan 16 2019 5:10pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 38
Views: 620

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

Even if now **larger** Voltage / SoC differences exist between the 2V cells, (as above, no charge source), no current will flow when paralleled? When cells are paralleled, current will flow until the voltages in each cell are identical. This will do a good job of balancing paralleled LiFePO4 batter...
by billvon
Jan 16 2019 4:17pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 38
Views: 620

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

Two sets of battery cells #1. 6x lead cells vs #2. 4x LFP cells within each set, each cell resting at slightly different voltages / SoC, small enough any "self balancing flow" current rate issues are minor. Two separate intra-pack wiring configurations: A. the set connected in series, both sets at ...
by billvon
Jan 16 2019 2:51pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

cricketo wrote:
Jan 16 2019 2:15pm
We might be settling on Mars before that stuff happens :)
We are settling Mars within 3 years? Why was I not told?
Work on that is already ongoing.
Agreed. Vogtle 3 will be open by 2021, Vogtle 4 will be open a year after that. The Chinese AP1000's are already up and running.
by billvon
Jan 16 2019 1:29pm
Forum: General Discussion
Topic: Fiat Chrysler pays millions...
Replies: 17
Views: 261

Re: Fiat Chrysler pays millions...

If the emissions laws were more reasonable the clean deisel would be cheaper and I could get something like the deisel Mazda 6 wagon which seems to be available everywhere else but "coming soon" for about 6 years here. What is unreasonable about them? I'll go ahead and repeat that the current laws ...
by billvon
Jan 16 2019 1:23pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

cricketo wrote:
Jan 16 2019 1:17pm
Sure, but reactors aren't happening for non-technical reasons. I guess that's another major difference.
Well, except they are happening, just slowly. We should start working on things that are possible today and see where it gets us.
by billvon
Jan 16 2019 1:14pm
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 38
Views: 620

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

So I assume you mean a series'd unit, say 6V, rather than separate 2V cells like Rolls Surrette, which could be put in parallel before serial. Yes, a large string in series, not parallel. Are you saying that works differently for lead than it does for LFP? Yes. LFP don't need to be fully charged to...
by billvon
Jan 16 2019 1:09pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

How about we stop fantasizing, and start working on things that are possible today and see where it gets us first ? Exactly, that's been my argument. In engineering we have to experiment and try out things, push the boundaries. There have been people like you in the past, who had well-supported pos...
by billvon
Jan 16 2019 11:18am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I agree. Cars kill more people in US than guns. We're trying to ban guns, not cars though :) Well, I'd say we're trying to regulate both. Cars have seen more success with regulation than guns. We are more likely to accept elevated risks when it is truly the only choice and/or a great necessity. I t...
by billvon
Jan 16 2019 12:53am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3228
Views: 109673

Re: Wind and Solar vs Coal, Gasoline, Nuclear

You can certainly make a reactor to any level of safety. No, you can't. Of course you can. You can design a reactor to any level of safety you like - if you are willing to pay for it. MSR's dump their entire core into a big concrete pit if temperatures exceed safe levels, for example - with no inpu...
by billvon
Jan 16 2019 12:40am
Forum: Battery Technology
Topic: LFP mobile House bank - xSyP serial vs parallel design thoughts
Replies: 38
Views: 620

Re: LFP mobile House bank - xSyP serial vs parallel design thoughts

but going past three **strings** in parallel can lead to balancing issues. I believe that is true, even with a proper balanced wiring scheme using buss bars in place, as per "Method 3" here: You're applying lead acid rules to LiFePO4 here. Since LiFePO4 does not have an inherent balancing mechanism...