alternative, economics, electicity, energy, Solar

Tesla Powerwall Explained (mostly to myself)


This is a very subjective post. I was always very keen to know what Tesla Powerwall was, and never actually bothered to read or wiki or youtube about it. Musk made it equals ‘is cool’ means ‘heap’ stands for ‘someday maybe’ really deciphers into ‘not in this part of the world unless one is fabulously well off.’ Summoning my excited pessimism, I have rolled my sleeves up and typed ‘power wall’ in the search bar. Four days later I made it to my laptop again to see ten or twelve tabs all reading tesla power w… A weekend has passed and I made myself find time to read, watch and comprehend.

Then I sketched what I got from all of this (attached).

A) The Sun is needed and conventional grid works well too.

B) PV panels are required too to send DC current to a sleek looking like a model S P85D bonnet cabinet

C) Powerwall either stores or uses electricity.

D) Energy bill is affected: use an off-grid electricity supply from your very own Powerball during peak hours

Internet is a good source till comments start coming along. One is not enough some say. 3.3kW limits the number of appliances used simultaneously. You need to put several batteries together to get a decent household use, they add.

Hey, we might have forgotten: the first iPhone did not record videos too.

The first battery of the kind might be expensive and till date may not be the most practical yet it gives a chance to store your own energy. A user stops just buying a kilowatt that is instantaneously consumed. A user can keep her kilowatt, and if not used, sell it or exchange. This is an economy.



economics, electicity, energy, lighting

1,5 seconds earn you an hour of artificial light

I have stumbled upon an interesting stats while reading Rational Optimist by Matt Ridley. Lighting folks could make good use of it. Mind it was written in 2010!

Ridley poses a question how much artificial light one can earn with an hour work.

  • Sesame-oil lamp in 1750 BC: more than fifty hours of work
  • Tallow candle in eighteen hundreds: around 6 hours
  • Kerosene lamp in 1880: 15 minutes
  • Incandescent lamp in 1950: 8 seconds
  • Fluorescent lamp on the brink of the first decade of the new millennium: half a second

“From six hours to half a second – a 43,200-fold improvement – for an hour of lighting: that is how much better off you are than your ancestor was in 1800, using the currency that counts, your time,” says the author.

Kudos to Tim Ferriss and Naval Ravikant for a great reading tip.

art, brain, electicity, mri, visual

Creepy post on visual images

“Color is the keyboard, the eyes are the harmonies, the soul is the piano with many strings. The artist is the hand that plays, touching one key or another, to cause vibrations in the soul,” said Wassily Kandinski, famous Russian abstractionist artist. The video above is an illustration to this, or is it?

Dr Jack Gallant from University of California, Berkeley, has created a library of images generated in peoples brain during watching hours of random footage in his lab. Guinea cinefiles were put into magnets of MRI scanners, and activity inside their head was meticulously recorded. Geeks will like it: the lab experts coded a so called movie-to-brain mathematical model predicting brain activity evoked by novel visual imaging.

… and I thought I was the one having trouble recognising people’s faces.