Search found 1456 matches

by billvon
Oct 26 2017 12:36pm
Forum: Alternative Energy
Topic: Using an old car alternator to generate electricity...
Replies: 28
Views: 6877

Re: Using an old car alternator to generate electricity...

That's a good point. With the electromagnet, the field could be made weaker and therefore the rotor would be easier to turn. No sense in putting work into electricity I don't need. There ain't no such thing as a free lunch. You get the power out that you put in, minus efficiency. Changing field str...
by billvon
Oct 26 2017 11:28am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Too bad there is no currently available effective way to make liquid fuel from the brief but increasing RE excesses. Here in San Diego there's a very effective way to make water from RE excesses. We have a desalination plant that supplies about 10% of our water - and since it's RO based, it can be ...
by billvon
Oct 25 2017 6:06pm
Forum: Motor Technology
Topic: High side vs Low side PWM
Replies: 74
Views: 4097

Re: High side vs Low side PWM

I have just been having another look over things and I noticed that there seems to be a large section where the high side is switched on. But looking at my pwm, this is not the case. Is this the motor generating the voltage? Well, sort of - the inductance of the motor is. What problem are you tryin...
by billvon
Oct 25 2017 12:02pm
Forum: E-Vehicles General Discussion
Topic: Cowardlyducks Prius - mods/conversion to Plugin/Solar PEHV
Replies: 49
Views: 6079

Re: Cowardlyducks Prius - mods/conversion to Plugin/Solar PE

So instead I've managed to find an entire replacement battery from a wrecked 2008 Prius with 117000kms on it. Picked it up for $1000 delivered which is an extremely good deal from what I've seen. It was delivered today, but I probably won't be installing it any time soon as I'm currently recovering...
by billvon
Oct 24 2017 10:21pm
Forum: E-Vehicles General Discussion
Topic: The 2017 EV's
Replies: 73
Views: 10646

Re: The 2017 EV's

Arlo1 wrote:Bahahahaha without Tesla you would not have any other EVs.
Hmm. Not sure that's true. Drove my first EV in 1992, rented my first EV in 1998 and bought my first EV in 2011. Tesla's definitely had a big effect on the market but they certainly didn't create it.
by billvon
Oct 24 2017 10:18pm
Forum: Alternative Energy
Topic: Using an old car alternator to generate electricity...
Replies: 28
Views: 6877

Re: Using an old car alternator to generate electricity...

Dauntless wrote:Is this good while you're still using it on a car? If so why do they build them the way they do?
Because the field winding allows you to regulate voltage without a separate buck/boost converter. With a permanent magnet, your output voltage is set by alternator speed.
by billvon
Oct 24 2017 2:02pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

How about if we were talking 30% of the population (of a planet. not a spaceship) forced to displace to keep from freezing to death from a lack of energy? Good solution - keep them warm in a way that does not kill anyone else. Bad solution - just keep killing people because it's cheaper. Or 70% slo...
by billvon
Oct 24 2017 12:16pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Never??? How do you figure natural gas will never become scarce? ?? I didn't say it will never become scarce. I disagreed with your claim that natural gas shortages will make it impossible to heat and power cities. Because: 1) We will use less of it over time as we replace natural gas generation wi...
by billvon
Oct 24 2017 11:05am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I didn't say it. eia.gov said it. When do you think natural gas will tip over peak availability so as to become too expensive to heat and supply overnight electricity to megacities in North America and Russia? Never. As renewables increase in capacity, natural gas use will go down. It will be releg...
by billvon
Oct 23 2017 10:46pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

sendler2112 wrote:90 years left. Then What? It gets mighty cold in the winter.
Passive solar. Biomass. Sewage digesters. Thermal dissociation/Sabatier process conversion of CO2 and water to methane.
by billvon
Oct 23 2017 10:44pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

That is the whole point of a licencing system.. Plants would not get a licence extension if there was any possibility of a safety risk. San Onofre reactors 2 and 3 got 20 year extensions in 2009 and 2010 respectively, after a lot of upgrade work to improve safety and performance. The leak began in ...
by billvon
Oct 23 2017 10:34pm
Forum: E-Bike General Discussion
Topic: Criminalizing e-biking
Replies: 56
Views: 4675

Re: Criminalizing e-biking

We e-bikers should be proud to expose this devastating decease with rock-solid proof. We could also help with the problem by doing things like obeying traffic laws. One of the problems in NY is that cops are finding people on ebikes doing 40mph the wrong way down one way streets, and on sidewalks. ...
by billvon
Oct 23 2017 1:15pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

To a point. Maybe solar can even go as high as 40% of current electricity in sunny areas of the world with smart grid control of thermostats, ect. Not in the NE USA though. Maybe near shore wind can takes it's place in such areas. Yes, every location will have its own ideal mix of generation. Plus ...
by billvon
Oct 23 2017 12:28pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Modular GenIV designs will be much better and cheaper if we were smart enough to choose to develop them. Sure; they are the "energy source of the future." I'm all for research and development. For now we go what's clean, cheap and working. Solar farms have no storage and cannot be compared to nucle...
by billvon
Oct 23 2017 10:48am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

PV generation plants are NOT cheaper on a MWh pa capacity basis. They are now. Quoted prices for solar - on bids that have been accepted - are lower than prices for nuclear power. Again refer to the eia .gov costings From eia.gov: Estimated LCOE (weighted average of regional values based on project...
by billvon
Oct 23 2017 10:38am
Forum: General Discussion
Topic: world's first graphene ship
Replies: 12
Views: 888

Re: world's first graphene ship

liveforphysics wrote:it may be in the next decade or two even disposable drink containers will be made from graphene, possibly grown into a can shape with no adhesive required in our lifetimes.
Disposable, lightweight oxygen and air canisters. (An application where graphene's strength would really shine.)
by billvon
Oct 22 2017 10:34am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

1)... That assumes a common 30 year working life....way too long for unproven PV systems I've got panels that have been in the sun for 30 years, and no problems yet. About a 5% reduction in output. , and way too short for established Nuclear technology ! We've got a reactor on the beach out here th...
by billvon
Oct 22 2017 10:30am
Forum: Battery Technology
Topic: BMS with LCD?
Replies: 11
Views: 740

Re: BMS with LCD?

My battery will be 13s2p (total 54V 3Ah) with 18650s and vruzend modular kit. I would like to add a BMS to it, and something I would really like is to monitor cell groups voltage, not only when charging, but also when riding. I was thinking of using a regular BMS like this one: can easily design it...
by billvon
Oct 22 2017 12:26am
Forum: Motor Technology
Topic: Paralleling MOSFETs and IGBTs?
Replies: 7
Views: 714

Re: Paralleling MOSFETs and IGBTs?

This I've anticipated. I have a potentially very clever or very stupid idea for reducing gate drive losses that I'm going to post so no asshole goes and patents it: bounce the gate charge to/from an inductor. That's resonant gate drive. We use that for our very high frequency (>2MHz) inverters. Unl...
by billvon
Oct 21 2017 11:40pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Ever heard of Sundrop farms? Yeah and that's a great approach. But I was thinking of something even simpler - PV arrays made with bifacial (i.e. semitransparent) panels to allow light to reach the ground below; then just normal ground cover (grass, shrubs.) Crops would be great in installations tha...
by billvon
Oct 20 2017 7:10pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

According to EIA.gov in end of year 2016 USA solar electric was at .9% of 400,022,000 total MWh/y. And 2016 was a very high year for solar build out due to worries of the federal 30% rebate going away. 2017 will be barely more than half of 2016. Long way to go to make any sizable contribution. Like...
by billvon
Oct 20 2017 1:06pm
Forum: Battery Technology
Topic: Plausible to build custom variable voltage Lion charger?
Replies: 30
Views: 1998

Re: Plausible to build custom variable voltage Lion charger?

Could you please explain how leaving a power supply connected to a battery at the end of charge is detrimental, even though zero current is flowing, the voltage remains stable and doesn't increase? Thanks. Worst case for lithium ion batteries is maximum voltage at maximum temperature. They will deg...
by billvon
Oct 20 2017 12:47pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3005
Views: 101779

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Basically it points out the madness of covering up large amounts of land that can sustain forests with solar farms . . . . Why not do both? Cover roads, buildings, parking lots, mine pits, deserts etc with solar, leave the open arable land for sequestration. Better yet - design solar farms that bot...
by billvon
Oct 20 2017 11:31am
Forum: Motor Technology
Topic: hub with 6 phase wires
Replies: 76
Views: 4217

Re: hub with 6 phase wires

So what relation between phase amps increase and volts decrease. What volts we get out of 72v batt when throttle is fully open. 72 volts. At wide open throttle there is no (or almost no) PWM effect; the battery is connected directly to the coils one phase at a time. So total phase amps is very clos...
by billvon
Oct 20 2017 11:24am
Forum: Motor Technology
Topic: hub with 6 phase wires
Replies: 76
Views: 4217

Re: hub with 6 phase wires

But ... you knew it was coming right? ... what about a step-up converter? Good question - but it gets more complicated. For a boost converter, you need an inductor, a switch and a diode again. But this time you connect one side of the inductor to the power source, and use the switch to short the ot...