Live data from Hacker News

Newly discovered formula explains efficiency gains from bifacial solar cells

purdue.edu

11–16 of 16 posts

Re: Newly discovered formula explains efficiency gains from bifacial solar cells

#11
post #4

We need a variety of cell that is transparent to wavelengths plants use, so they could be used above farmland and pasturage. Many plants could probably be grown under them in places where it would otherwise be too hot, maybe even needing less water.

That’s a great idea. They could hold in heat at night too which could be useful. Maybe prevent frosts in winter.

Re: Newly discovered formula explains efficiency gains from bifacial solar cells

#12
post #4

We need a variety of cell that is transparent to wavelengths plants use, so they could be used above farmland and pasturage. Many plants could probably be grown under them in places where it would otherwise be too hot, maybe even needing less water.

I imagine different plants need multiple different wavelengths.

Most of the plants I know about are green, and rely on chlorophyll electrochemistry.

Re: Newly discovered formula explains efficiency gains from bifacial solar cells

#14
post #12

Earlier quoted context omitted.

I imagine different plants need multiple different wavelengths.

Most of the plants I know about are green, and rely on chlorophyll electrochemistry.

Don't they look green because they reflect most green wavelengths?

Re: Newly discovered formula explains efficiency gains from bifacial solar cells

#15
post #5

Surely a small stepper motor will still consistently win? I mean this is cool for fixed structures but overall finding some empty space and pointing the thing straight at the sun seems better.

Sun trackers are marginally more efficient, but the complexity of motors and a moving frame make it less desirable.

Re: Newly discovered formula explains efficiency gains from bifacial solar cells

#16
post #14
post #12

Earlier quoted context omitted.

Most of the plants I know about are green, and rely on chlorophyll electrochemistry.

Don't they look green because they reflect most green wavelengths?

Yes, they don't use green. Or infrared, beyond 700nm. I don't know if they reflect the IR like they do the green.

Conversion efficiency of the part they do use can't be more than a few percent, so they probably radiate in IR. Converting IR radiating from plants, as suggested in TFA, thus seems like a good idea.

Post reply on HN