closed hydrogenelectrolyzers.com + similar domains

[The Name You Know]

Hello all,

After looking around for quite a while, this is my first post here. I would like opinions on the following:

I own the domains:
hydrogenelectrolyser.com
hydrogenelectrolysers.com
hydrogen-electrolysers.com
hydrogenelectrolyzer.com
hydrogenelectrolyzers.com
hydrogen-electrolyzers.com

I don't really have a direct need to sell them. But since I don't understand much about hydrogen technology, I have no idea of the potential of the names.

Parking (first at SEDO; now at ND) hasn't brought me much.

There is a working web site (in German) at:
http://www.hydrogen-electrolyzer.com

Would it be worth my while to make (or order) a ppc site on one domain, for instance hydrogenelectrolyzers.com, and redirect the rest? Or do the names seem of little value? Any ideas?

Any response will be highly appreciated!
The Name You Know.

 

[The Name You Know]

I asked a valuation from premiumdomain.com, and their answer was:

"Unfortunately none of the names you submitted have a DomainScore over 300.
This means they cannot be considered for a deeper review to be certified as Premium Domain."

So I guess they're not enthusiastic? Anyone else?

A hydrogen electrolyzer -by the way- is a machine that makes hydrogen from water and oxygen. It uses electricity to do so. These machines seem not to be very efficient, but in the "Hydrogen Economy", as envisioned by some, IF it will become reality, they will be mass-produced, and thus a marketable item.

Any ideas about what the domain is worth?