Charging from solar

Charging from solar

Hello all,

what can TESLA do to enable charging their EVs from solar photovoltaics? I have a special DC circuitry in mind: running 300-500V DC from my PV array directly to the charge port.
The EV on board charge controller then must perform a MPP tracking (=maximum power point) and it must adjust to rapidly changing currents when cloud cover shadows the PV array.
Will the improved overall efficiency pay off the extra hardware?

Second thought, after some years I will have a "worn out" ESS with remaining 25kWh of its initial 53kWh capacity, but far to valuable to discard. I want to use it in my home to buffer electricity demand. Similar requirements here are: do a DC/DC charging with MPP tracking. Feed the surplus energy into the grid via DC/AC inverter. Have an advanced switching unit that runs my home from the ESS if the grid blacks out. And, of course, install a thermal management system for the ESS similar to that in the EV. What do you think, will that pay off?


BYT | 18. Februar 2011

This is what I have done for my home, solar panels on the roof feeding back to the grid during the day! I just wish we had more sun lately!

Brian H | 20. Februar 2011

Well, see I have this ideer. Put the solarcells on mounts with an axle thru the center, and a slight flange on top and bottom, and hook to a small magnet on the mount, which rotates past a solenoid, and when the wind blows you'll get power even tho' there's no sun!

Brian H | 20. Februar 2011

How d'ya like my smileys? I did it the hard way: poached the images from another site.

BYT | 23. Februar 2011

The future for our Solar Powered homes and Model S's?

Brian H | 23. Februar 2011

It's my fervent hope that all that fancy folderol will be economic white-elephant roadkill beginning in about 5 yrs. If succeeds, power will be under ½¢/kwh, which will make all the solar/storage stuff insanely over-priced by comparison.

BYT | 24. Februar 2011

How big is that "IF"?

Timo | 24. Februar 2011

In my opinion it isn't "if" anymore for "can it be done" for fusion, but it is a big "IF" for five year timeframe for aneutronic fusion. Dense plasma focus is the way to generate fusion, cheap, reliable and no-fuss tech to accomplish it. Those tokamak-monsters are pretty stupid devices if you ask me, they will never succeed.

VolkerP | 25. Februar 2011

The good news is that fusion reaction works today.
No radioation hazard, no radiactive waste, no fuel concerns, no maintenance. No bills for the resulting energy.
The reactor runs at a comforting distance of 95 million miles. Energy output is in form of light (and a little flares).

You already guessed it - I talk about the sun.

In Germany, we had the government thrive on nuclear fission reactors back in 1970-1980. They promised "no more meters" because electricity would be sooo cheap. I don't by this stuff. As long as electricity is produced in a central plant, someone will run a network to distribute it and get paid for that. In Germany, we have production costs 4-5 Euro cent/kWh from nuclear and coal, and consumer prices up to 23 Euro cent/kWh. Even if the plant put's out energy at 0 cent/kWh someone will charge me big bucks. No thanks.

Within two generations, we will tell out grand children of today's energy troubles, war on oil and so on - they will stare in disbelief and ask "why, was there no sun in these days?"

Timo | 25. Februar 2011

Unless you are willing to pay big bucks for solar-based electricity by putting solar power satellites in orbit Sun alone will never be enough. It doesn't shine every day, there can be weeks, sometimes over month between sunny days, and here in north it just doesn't shine at all for many months just when it is most needed.

Sun will be there, but it will not be used for energy production for most of the world. There are cheaper and more reliable ways of doing that. If DPF succeeds you get your "no radioactive hazards, no radioactive waste, no fuel concerns and no maintenance" from it ("no maintenance", in same way as "no maintenance" for solar cells) for teeny tiny fraction of the cost and space of solar cells.

Brian H | 25. Februar 2011

The analogy with the Sun rather breaks down when talking about FF. It uses microsec bursts of fusion at 100X the temp of the Sun's core. And extracts current directly.

BYT; The IF is getting smaller all the time. LPP has already come orders of magnitude closer to theoretical break-even than any other approach (according to public data, anyway). Keep track of it over the next year and the IF should shrink to very small proportions. Within 2-4 yrs after that, they should be on the market, and the world changes.

Timo | 25. Februar 2011

There is no doubt in my mind that FF can do it with tritium-deuterium -fusion, that is probably quite easy. What still remains to be seen is is it possible with hydrogen-boron, which would be the ultimate goal (both abundant, produces aneutronic fusion).

Brian H | 26. Februar 2011

T-D or D-D fusion won't cut it with the FF, because they're so rich in "fast neutrons". D-D fuel is being used for preliminary testing only, with thick walls of concrete and other shielding. One of the keys to FF is aneutronic operation, which permits the small size, and bypassing the neutrons-hot stuff-boiling water-steam-electricity steps, which are only about 30% efficient (up to 50% in some advanced designs). They're expecting to move up to boron this year (a few months), with some other heavy gases like nitrogen etc. as part of the testing process.