You can produce 100,000v by a common solar panel as well if you want. Voltage is completely irrelevant, what counts is energy.
> Thus we can scale it.
I don't follow. What does voltage have to do with anything?
> Did you and everyone think I was proposing to use gigawatts and electrolyse 1% of ocean water in a few seconds? O_o
Um, yes. Do you have the slightest idea how much energy it would take to electrolyze 1% of the ocean? I did some math for you: you need 1.752×10^26 joules. If you had a gigawatt available to you it would take 5,552,000,000 years.
Did you and everyone think I was proposing to use gigawatts and electrolyse 1% of ocean water in a few seconds? O_o