Hello everyone, here is a very interesting rocket stove wood stove project https://www.youtube.com/watch?v=4epE50h6t68 then various modifications made to the rocket stove https://www.youtube.com/watch?v = 5oEdZFCNuQg https://www.youtube.com/watch?v=Xk8idjJR1H0 the videos are not from me, ju ...

The question is in the title: when we compare all the battery technologies available for solar, the best compromise between recyclability / price / availability remains techno lead?

Interesting subject, NIFE-like battery that we could easily design in his garage for almost no round.

http://mavoiescientifique.onisep.fr/des ... uperation/

There is no inexhaustible energy; at most a sustainable energy source ... The means to collect, transport, transform this energy from perennial sources to make it usable are strictly limited, by their cost - therefore their embodied energy -, by their lifespan and by the...

But what is the point of using hydrogen as a substitute for fuel? Hydrogen is made from methane, with a very poor energy efficiency, or by electrolysis (and the efficiency is even worse, especially since in Germany electricity is very carbonaceous) ...

On other articles they explain this choice: It is not to replace the existing electric train but those with diesel. Why ? Because some lines, as in France, do not have an electric line and creating one will cost too much, not to mention maintenance. This hydrogen train ...

Christophe,

The rocketstove has been overtaken by the batchrocket:

http://uzume-asso.org/batchrocket.html

Gimbals on motorcycles have never been a problem so I don't see how on a bike it could be annoying. A universal joint is: Durable No maintenance (possibly the lubricating oil to be changed from time to time) No dirt No derailment On the other hand: Heavier No ...

There is also this subject (in English) that could interest you:

http://solarhomestead.com/making-a-sola ... er-heater/

There are systems already completed across the Atlantic:
http://www.cyboenergy.com/solutions/pvsolarheating.html