Search found 1456 matches

by billvon
Nov 19 2018 11:48am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Wet bulb temps above 40C can be lethal to elderly people. Yep. And with temperatures climbing globally, that's just going to get worse. Indeed, air conditioning will be one of the fastest growing uses of electricity over the next 40 years or so. Fortunately there are several organizations out there...
by billvon
Nov 16 2018 7:17pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 28
Views: 743

Re: A portable gasoline generator for long range

But those are fan-less sealed chargers, and for that I believe they have an excellent power/weight density. (but correct me if I am wrong here) Agreed. They are great chargers, and the sealed case is an advantage if you are going to be all-weather touring. Forced air cooling power supplies can use ...
by billvon
Nov 16 2018 5:33pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 28
Views: 743

Re: A portable gasoline generator for long range

My so far working practical solution, which works well at the moment, is using 4 Satiator-chargers as one big brick. I can rapidly charge at any place with electricity at 360*4=1440W of power. (But only because my battery can accept that fast charge rate without being deteriorated) That is great - ...
by billvon
Nov 16 2018 5:19pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Germany is importing slightly from several countries tonight. Including France. So France exports at night when demand is low (and renewables are not generating much) and Germany exports during the day (when demand is high and renewables are producing.) That sounds like an example of a working syst...
by billvon
Nov 16 2018 11:30am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 28
Views: 743

Re: A portable gasoline generator for long range

Do you know of a small generator (that can produce about 700W) so that it won't be so heavy? For that you don't want a generator. You want a direct drive gas engine, geared for cruising speed (i.e. 25mph.) If you have a DD hub motor you already have a generator. You might consider a pusher trailer ...
by billvon
Nov 16 2018 11:23am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

TheBeastie wrote:
Nov 16 2018 1:49am
Just to be clear, before I read a post I check to see if there are any URLs
Aha I have figured it out, all I do is add their profile to "Foe".
Probably a good move on your part. Some people can't stand being exposed to any facts that contradict their own preconceptions.
by billvon
Nov 15 2018 3:56pm
Forum: E-Bike General Discussion
Topic: Slower with bigger chainring?
Replies: 6
Views: 254

Re: Slower with bigger chainring?

What could be going on here? Have I "topped out" the amount of assist the tsdz2 can supply or something? It feels like its giving less assist than it did with the smaller ring, and the speedometer readings seem to support that too. You are running out of torque. The larger chainring reduces the tor...
by billvon
Nov 15 2018 12:21pm
Forum: Motor Technology
Topic: What kind of motor is this?
Replies: 6
Views: 295

Re: What kind of motor is this?

gotgraham wrote:
Nov 15 2018 12:14pm
Yep! The case side of the rotor has small magnet(s) for the halls.
Good; that will make it easier to interface to a "conventional" controller.
by billvon
Nov 15 2018 12:11pm
Forum: General Discussion
Topic: List of small hatchback cars
Replies: 103
Views: 3328

Re: List of small hatchback cars

Lebowski wrote:
Nov 15 2018 12:03pm
A prius is much bigger than a small hatchbar car and roughly 3 times the price...
The Prius-C is pretty dang small. And with so many of them out there, you can get a used one for very cheap.
by billvon
Nov 15 2018 12:10pm
Forum: Motor Technology
Topic: What kind of motor is this?
Replies: 6
Views: 295

Re: What kind of motor is this?

Is this a brushless DC motor? Can someone direct me to some generic documentation for driving this type of motor? Yep. SRM motor, characterized by large, nonmagnetic salient poles on the rotor. No windings on the rotor. Are there separate (small) magnets for the Hall sensors? If not they will work ...
by billvon
Nov 15 2018 11:38am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Its called "compromise" bill,... Xactly. Just as the cold, heat, road accidents, malnutrition, etc etc .....all kill millions needlessly , but could be prevented by different human decisions. Correct. And we make "different human decisions" all the time to prevent those things. Public assistance fo...
by billvon
Nov 15 2018 11:31am
Forum: Motor Technology
Topic: Brushless motor efficiency
Replies: 16
Views: 665

Re: Brushless motor efficiency

I have had the motor running on 50v and the no load current is 5.5amp. When I run the motor on 75volts I am getting 10.5 amp no load current and the motor is heating up quite rapidly. Does this indicate that 75v is to much for the motor and it is loosing its efficiency? What speed is it running at?...
by billvon
Nov 14 2018 10:48pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

You are showing a lack of vision there bill, if the viability of coal is the worst reality you consider might occurr. ?? We could all be killed by a big meteor tomorrow. That's certainly worse. But less likely. Coal will be available , and viable , way longer than it will be needed to keep society ...
by billvon
Nov 14 2018 7:26pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Bill, ..you argument points are getting even more rediculous ! Capacity factors are all a little pointless anyway , as most of the general public, nearly all politicians, and many so called "experts".... All still consider a GW of installed PV or wind , is exactly the same as a GW of Nuclear, Gas o...
by billvon
Nov 14 2018 6:39pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

There is always 1 outlier out of 448. Well, and Three Mile Island. Pretty low average availability there. And Davis-Bessie, of course. Its availability is around 70% as a result of a football-sized hole in the reactor core that the operators overlooked for a few years. It took two years to fix that...
by billvon
Nov 14 2018 6:02pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

sendler2112 wrote:
Nov 14 2018 5:50pm
Lifetime average capacity factor of nuclear is over 90% for 60 years.
For the past 6 years or so, the availability of the nuclear power plant nearest to me has been 0%. And supposedly it was going to last until 2030.
by billvon
Nov 14 2018 11:17am
Forum: Battery Technology
Topic: Taking prebuilt pack out of casing to fit in smaller space?
Replies: 10
Views: 291

Re: Taking prebuilt pack out of casing to fit in smaller space?

My thought was to perhaps buy a battery pack and take it out of the bulky plastic casing and hopefully have a much smaller pack to work with. I'd consider modification of the case rather than replacing it. A 3D printed replacement for part of the case - or even fiberglass/resin - might work for you.
by billvon
Nov 14 2018 11:15am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 42
Views: 2567

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

If i look on the circuit diagram of a power stage, if BEMF is going up above battery voltage it should work like a bridge rectifier and would charge your battery. This would stress the diodes but it should not hurt the Mosfet's itself (in terms of max voltage rating). Yes, with a minor caveat - in ...
by billvon
Nov 14 2018 12:30am
Forum: Motor Technology
Topic: Solid State relays Controller?
Replies: 3
Views: 202

Re: Solid State relays Controller?

Please forgive my noobness if this is a silly question, but I was wondering if, according to you, it would be possible to build a controller power stage out of DC-DC Solid state relays. Nope. They are specialized devices intended to turn DC power on and off fairly slowly. You want something that wi...
by billvon
Nov 13 2018 10:31pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

It's crazy that these LCOE charts are still even made. I really think its due to no other reason than traditional point of view that has come conventional energy, but doesn't fit with RE. It should be abandoned or even made illegal to mention or list wind/solar RE in any other term that its "expect...
by billvon
Nov 13 2018 4:44pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Looking for compact high voltage DC-DC
Replies: 5
Views: 336

Re: Looking for compact high voltage DC-DC

TilmanBaumann wrote:
Nov 13 2018 5:57am
Output 12V ~30A

The MeanWell RSD series stops at 160V, and it would be quite a pain to weatherproof that.
The SD Series also doesn't seem to go to 144V only. May I ask which model you meant?
ERPF-400-12. 127 to 370VDC in.
by billvon
Nov 13 2018 4:38pm
Forum: General Discussion
Topic: gas price thread
Replies: 729
Views: 50068

Re: gas price thread

fechter wrote:
Nov 13 2018 4:19pm
I don't get why gas is over $1/gal cheaper there than here. Sure, the formulation is a little different, but not $1/gal different.
Tax structure. Differences in gas formulation. Distance to refineries. Things like that.
by billvon
Nov 13 2018 3:38pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 42
Views: 2567

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

So if you were to coast at 30mph with no field weakening currents, does this mean you could blow your controller or expose it to high voltages? That is possible but unlikely. You would not see overvoltage because the diodes would freewheel and direct the current to the battery. However, it is possi...
by billvon
Nov 13 2018 11:14am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101757

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Sadly, Lazard seem to think that a levelised comparison can be drawn between conventional, reliable, continuous, power sources,....... and unreliable , intermittent , sources, without storage or backup. To compare those, you can use LACE rather than LCOE (levelized avoided cost of energy.) By that ...
by billvon
Nov 12 2018 5:55pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Looking for compact high voltage DC-DC
Replies: 5
Views: 336

Re: Looking for compact high voltage DC-DC

TilmanBaumann wrote:
Nov 12 2018 5:45pm
I'm looking for a 144V nominal (180V max) DC-DC converter for a 40s motorbike/scooter.
What output voltage? And what current needed?

Many Meanwell supplies will accept inputs down to 127V DC and go up to 370V or so DC. Look at their spec sheet.