My understanding of it is that massive objects do not affect the speed of light at all, not even black holes.

They bend space itself meaning that light will always travel at the same speed, even in proximity of a black hole, but over a distance that becomes, from the local point of view, more and more vast, to the point where, seen from the "undeformed" space outside, it looks as if it took it longer to traverse that stretch of space (because we cannot perceive and have a hard time even imagining the fact that "there is more space" there), or it doesn't come out of it at all.

Maybe someone more into these aspects can tell me if I am oversimplifying or outright wrong.

Yep, i did exactly that. Ok, so we are down from "sustaining a family" to "keep phones charged".

Ok, trying to make sense of those numbers.

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Water is clearly indicated as daily production. 750 g of water per square meter per day, means that 2 square meters can sustain the drinking water of a person, if you also want to wash and cook, you may want to scale up, still not too shabby if you pave a roof of it a family can probably get enough to be self sustaining... my only qualm is that this will not be drinking water probably, unless you can assure it is free of contaminants and add minerals I guess.

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For the electricity part as far as I understand the 685 mW are the average instant production in day time. This probably rounds down to about 4Kw/h per square meter per day, which if I understood correctly, is not too shabby, again a decent roof mounted installation could easily cover the needs of a family.

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Sooo... where is the catch? There must be a catch...

EDIT: as u/AnimiLimina ponted out, the catch is that I got lost between Watts and kiloWatts, I got carried away by the wish fir this to be a game changer apparently (watever, it remains a stupid mistake, sorry everybody).

This is dumb on a fundamental logic basis and also doesn't fit in this subreddit not even sideways and pushing.

On mobile, the space rpg series, I played both the 3 and the 4 for hours on end, don't be fooled by the graphics.