Endless Sphere

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 ...

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...

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...

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.

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.

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 ...

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...

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...

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.

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.

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...

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 ...

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.

I'm looking to buy a 48v battery for my TSDZ2 and have the option of a 13s4p Samsung (2600 mah cells) and a 13s3p (3600 mah cells) Sanyo. The 13sp3 is smaller due to less cells and will fit my frame bag better. Is there any disadvantage with the 13s3p rather than the 13s4p battery ? Lower current h...

tomtom50 wrote: ↑

Nov 11 2018 8:02pm

Recommendation for a linear regulator to use for 20A?

I would use a LM431 regulator for control and a P-channel MOSFET to pass the current, so you don't need an additional supply. (Probably need an NPN transistor in there somewhere too) Set to regulate to 55 volts.

Since the BMS are connected simultaneously would they interfere with each other? Depends on the BMS. They will almost certainly discharge the 14th cell at a different rate. It would be important to charge it the way it had just been used (13S or 14S) so all parallel groups being charged are at simi...

Whatever they're trying to do to the #Tesla official forum, I don't think this is what they want people to see on the first page. I just took a look and here's what's on the real first page (i.e. newest posts in the Model 3 forum) - ==================== Flawless Model 3 pick up Wifi doesn’t work ? ...

Is lidar the best sensor for autonomous driving cars? It's pretty good. Ranging solutions around that frequency range (i.e. millimeter wave, IR) work fairly well. There are some slight differences in weather penetration. Have often wondered on this autonomous driving who is liable The driver is alw...

I am thinking this might be due to the low amount of capacitance in the FET's, and may be fixed by adding addition capacitance across the gate/ source to stabilise the voltage difference? And then go for a lower gate resistor value? The ringing is likely not real; the FET isn't seeing it. You are s...

I have an electrical bike (https://www.sprinter2000.ro/cumpara/bicicleta-electrica-sprinter-st1402-736; use a translator from romanian to english) My bike has control display LED model 810, battery is 36V 21A, hub mounted motor 36V/350W and on controller is write 13+/-1A. The bike is limitated elec...

Do you know off hand how hot are the actual battery internals at the end of your ride? We find that on most ebikes they're rarely more than like 10-20 above ambient, and it's not really much of a concern. Not directly. The case feels like it's about 30F above ambient (i.e. 100F on a 70F day) but I ...

My October utility bill just arrived, and I cracked 5 digits in credits, 10,273 KWH's in the bank. November is typically when my production falls behind my consumption. Yep. Around this time of year production starts lagging behind generation. This month we are averaging 3kwhr a day net usage, incl...

Unfortunately water cooled reactor cores and pumped cooling ponds need to be superceded with something that is indefinitely passive and walk away safe. There are several LWR designs that are passively safe; decay heat is taken care of by natural convection with no intervention. The AP1000 comes clo...

Punx0r wrote: ↑

Nov 06 2018 8:07am

It looks like Barakah is the only plant under construction in the UAE and it uses APR1400 reactors.

Disappointing. I'd hoped to see more inherently safe reactors developed.

1) Most setups, for example 7S4P, wire the parallel groups together first in sets of 4 then series-connect the 7 parallel sets. My scheme depends on series-connecting strings of 7, then paralleling the 4 strings. Electrically the two choices are identical in terms of voltage & capacity to deliver p...