Search found 577 matches

by jimw1960
Apr 23, 2018 8:47 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Wow. Just wow. The ignorance is strong with this one. So strong it has to be willful. Now he's trying to say that calculations are theories? Don't waste your time with this guy.
by jimw1960
Apr 20, 2018 10:24 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

For what it's worth and contrary to an uninformed comment above, the greenhouse effect of carbon dioxide is not a theory. It is an observation. It is measurable. It is a fact. Similarly, the LAWS of thermodynamics are not the theories of thermodynamics. The known greenhouse effect of carbon dioxide ...
by jimw1960
Apr 17, 2018 9:29 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Check out this video about a floating offshore wind turbine project in Scottland. The turbines are 6 MW each and huge! Supposedly has been consistently producing at over 60% of rated capacity. Some serious heavy lift operations going on in the video. Not sure how the cost compares to a coal or gas p...
by jimw1960
Mar 29, 2018 2:45 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I found this analysis relevant to the discussion: The authors analyzed 36 years of hourly weather data (1980–2015) in the US. They calculated the available wind and solar power over this time period and also included the electrical demand in the US and its variation throughout the year. With this in...
by jimw1960
Mar 09, 2018 11:17 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Here is perhaps a better article on wind turbines and bird fatalities, includes links to studies.
https://www.desmogblog.com/2018/02/17/w ... out-be-why
by jimw1960
Mar 06, 2018 5:16 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I found this study encouraging. It's all about getting the right mix for your market and climate conditions. There is a good future to be had with a career in optimization modeling: We model many combinations of renewable electricity sources (inland wind, offshore wind, and photovoltaics) with elect...
by jimw1960
Feb 14, 2018 3:42 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

\Serious question: How many of these next-gen thorium/molten salt reactors have been built as at least a working prototype yet? Just the one at Oak Ridge back in the 1960s. Supposedly it ran for several years with no problems. Problem nowadays is that licensing is a lot more difficult. I used to do...
by jimw1960
Feb 12, 2018 1:46 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Texas Got 18 Percent of Its Energy from Wind and Solar Last Year. "The Texas grid, operated by the Electric Reliability Council of Texas (ERCOT), has seen sustained levels of wind energy penetration above 40 percent for hours at a time without significant issues." https://blogs.scientificamerican.co...
by jimw1960
Jan 02, 2018 3:53 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Back in my grad school days doing field research on the Greenland Ice Sheet, we used solar arrays to power several of the experiments. This was at 78 degrees north, a full 12 degrees above the Arctic Circle, where the sun would just go around in a circle all day. We never had problems with snow cove...
by jimw1960
Dec 21, 2017 4:27 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Cobalt supply.. Ref ..J Petersen ..investment analysist/researcher If true, that represents approx 200GWh of battery storage. Even if its out by a factor of ten , its still a serious limiting factor Petersen is a con artist. He suckered hundreds of people into buying stock in Axion, a maker of lead...
by jimw1960
Dec 21, 2017 3:30 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1850
Views: 49758

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Wind power generation capacity in Texas now exceeds that of coal power capacity. Several coal plants are to be closed next year. https://www.texasmonthly.com/energy/wind-power-capacity-surpassed-coal-texas/ Battery storage for load leveling is still the crux for a bigger portion of energy from renew...
by jimw1960
Dec 21, 2017 11:49 am
Forum: Battery Technology
Topic: Battery Recommendation Request
Replies: 1
Views: 170

Re: Battery Recommendation Request

My trusty old Ping battery from 2009 is still going strong after all these years. Not made in USA though.
http://www.pingbattery.com/servlet/the- ... PO4/Detail
by jimw1960
Aug 04, 2017 1:41 pm
Forum: Items for Sale - Used
Topic: MC2 Chopper bike: Nothing like others
Replies: 2
Views: 447

Re: MC2 Chopper bike: Nothing like others

Oh my gosh, that thing is hideous!
by jimw1960
Apr 25, 2017 2:53 pm
Forum: Battery Technology
Topic: Ping Battery Storage
Replies: 5
Views: 399

Re: Ping Battery Storage

I have a Ping battery that I have stored for over a year without charging or disconnecting the BMS. It held its charge just fine. I wouldn't worry about it if it's just three months.
by jimw1960
Jan 18, 2017 9:33 am
Forum: E-Bike General Discussion
Topic: Battery Cost
Replies: 26
Views: 1653

Re: Battery Cost

I want to add a plug for the Ping battery. I have a 48v 20ah Ping that I bought in 2009. It saw a lot of use the first couple of years with maybe two 30-mile round trip commutes per week. The past 4 years it has only been used a couple times per year and sits for over six months at a time in my shed...
by jimw1960
Sep 28, 2016 3:35 pm
Forum: E-Bike General Discussion
Topic: Oval chainrings
Replies: 12
Views: 435

Re: Oval chainrings

My old Raleigh Technium mountain bike had those. It's supposed to give you more power on the downstrokes. I thought it worked well enough. I didn't really notice it while riding.
by jimw1960
Jun 24, 2016 10:50 am
Forum: EV Business World
Topic: Ideas about opening up an electric bicycle store.
Replies: 37
Views: 3883

Re: Ideas about opening up an electric bicycle store.

How To Make $1 Million

Step 1: Start with $2 million

Step 2: Open an ebike shop.
by jimw1960
Apr 29, 2016 3:07 pm
Forum: Battery Technology
Topic: Walmart Booster Batteries
Replies: 296
Views: 7525

Re: Mounting the Walmart Booster Batteries

That discharge profile looks pretty flat for lipo cells. Could it be some other chemistry?
by jimw1960
Apr 29, 2016 12:12 pm
Forum: Battery Technology
Topic: How long do batteries last?
Replies: 30
Views: 1517

Re: How long do batteries last?

It's hard to tell what the range is now. My round trip commute is about 10 miles. A few months ago, I used it on three consecutive days without a recharge and it didn't cut out. So still has at least 30 mile range. I'm still amazed that sitting in a shed in San Antonio fully charged hasn't killed it...
by jimw1960
Apr 28, 2016 10:19 am
Forum: E-Bike Technical
Topic: Costco Jumper Batteries? Crazy?
Replies: 7
Views: 493

Re: Super Fast Battery Question

In short, yes, you can do that. Parallel would give you twice the AH and discharge current. You'd probably want to put some diodes on the positive power output wires to prevent one pack discharging into the other when they are not at the exact same charge. You'd also want to separate them for chargi...
by jimw1960
Apr 28, 2016 9:54 am
Forum: Battery Technology
Topic: How long do batteries last?
Replies: 30
Views: 1517

Re: How long do batteries last?

That's interesting, seeing as San Antonio is a bit warm in summer. What temp would you say it's stored at? And apparently stored full too. This is the first I've heard of a Ping going much more than 4 years. If the battery is big enough, and the controller modest, it may be you don't notice the ris...
by jimw1960
Apr 27, 2016 8:11 am
Forum: Battery Technology
Topic: How long do batteries last?
Replies: 30
Views: 1517

Re: How long do batteries last?

I have a Ping battery going on 7 years old. I don't ride it that much anymore but every few months when I pull it out, it is still fully charged and still has plenty of range. So probably number of cycles is the determining factor in battery life. Shelf life doesn't seem to be an issue.
by jimw1960
Jan 29, 2016 11:09 am
Forum: General Discussion
Topic: gas price thread
Replies: 695
Views: 39756

Re: gas price thread

The fingers wrote:Regular $2.35, supreme $2.57 per gallon. :D
That's pretty pricey out there in Cali. On my way to work this morning in San Antonio, saw $1.37 for regular. That's just insane cheap. Pretty soon they'll be paying us to take it off their hands.
by jimw1960
Jan 19, 2016 5:02 pm
Forum: General Discussion
Topic: gas price thread
Replies: 695
Views: 39756

Re: gas price thread

Cows also produce tons of CO2 and greenhouse gasses. When it comes to CO2 emissions, I do my part by trying to eat as many cows as possible, and choking stupid people. I dont know if it will change the world, but I feel good knowing that I am doing my part. Cows are effectively carbon neutral. Gras...
by jimw1960
Dec 09, 2015 3:20 pm
Forum: E-Bike General Discussion
Topic: Electra Straight 8 Brake Options
Replies: 18
Views: 1829

Re: Electra Straight 8 Brake Options

The newer Electra Straight 8 models come with front disc brake and a choice of 3-speed or 8-speed rear hub. It would work pretty good for a geared front hub motor. Since you already have your bike, maybe you could call Electra support number and ask how to buy one of the forks from the newer model. ...