[controversial97]

If that thing goes seriously wrong it could be an impressive incendiary device.

I would want that to be in it's own separate brick outhouse or on a concrete pad twenty feet from anything that should not be sprayed with fire.

See this video of taking apart a USB power pack that runs on hydrogen.

https://www.youtube.com/watch?v=y48wCuC3KcA

Lavo seems to be claiming that one of their devices will last 30 years, which is better than a flooded lead acid battery system, if that is actually true.

[orev]

Many, many places that are not served by gas lines have external propane tanks now, and those are right next to the house. How would this be any different?

[exhilaration]

One major difference is that hydrogen tanks are subject to embrittlement: https://en.wikipedia.org/wiki/Hydrogen_embrittlement

[marcosdumay]

For a start, propane does not leak through solid metal.

It also requires much smaller pressures to be useful.

[controversial97]

I think that a better analogy would be a big tank of acetylene connected to a complicated chemical reactor.

Propane does not concern me. A big tank of acetylene would be of concern to insurance companies, the fire brigade and the local safety agency.

[random42_]

At least in the US, there are regulations for placement of a propane tank that depends, among other things, size and capacity of the tank.

[Manuel_D]

natural gas is a lot easier to store than hydrogen gas. Hydrogen atoms are small, permeate most materials, and rust metals into hydrides.

[c_o_n_v_e_x]

>Hydrogen atoms are small, permeate most materials, and rust metals into hydrides.

Hydrogen also has very low ignition energy, wide band of flammability (LEL to HEL), and requires usage of comparatively more expensive materials for handling.

[tppiotrowski]

https://youtu.be/y48wCuC3KcA?t=1020

TIL: hydrogen soap bubbles float up