1155
Supply and demand (thelemmy.club)
submitted 5 months ago by [M] to c/memes@slrpnk.net
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[–] 12 points 5 months ago (8 children)

Maybe I don't know enough about electricity at large scale, but at small scale you can just cut the circuit. Electricity isn't like water that just sits in the pipe when you close a valve, right?

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  • [–] 9 points 5 months ago (5 children)

    It is a lot more like water than you think. The solution of “just cut the circuit” is like solving the problem of overflowing storm drains by “just plug the pipe”.

    The power has to go somewhere. If you don’t do anything about it, the voltage in the cables will rise until things start to fry. Real world power balancing involves adjusting the output of power plants (e.g. how much fuel to burn) in response to changes, and in some cases, dumping power into the ground as safely as possible. This problem gets complicated when power grids span vast distances and involve many different power plants that all need to be in sync or things catch on fire.

    In the case of solar power, this is part of why improved large-scale battery technology is so important. It lets you absorb the excess power at peak generation times, and then release that power at night.

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  • [–] 4 points 5 months ago (4 children)

    Can't you cut the power at each individual solar panel? I assume that the amount of electricity out there is low enough to not cause that kind of problems?

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  • [–] 7 points 5 months ago* (2 children)

    You're pretty much describing what hybrid inverters do for home solar panels. They can disconnect and not export to the grid when you don't need it and just power your house and charge your batteries.

    But hybrid inverters are quite a bit more expensive than standard grid-tied inverters that are always pumping into the grid.

    For instance, I just had to replace my home inverter that died and I got a cheap 6 kilowatt inverter for about $1,300. A hybrid inverter would be at minimum 3 or 4k.

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  • [–] 2 points 5 months ago (1 child)

    Im not that guy, but im picturing moreso just that solar panels come preinstalled with the glass that turns opaque when it recieves voltage. When your batteries are full and the grid isnt pulling power, that would progressively look more and more like either a short citcuit or, more likely, an open circuit. When the voltage rises too much due to na open circuit, the solar panel shuts off by turning the glass opaque, which also adds a load to the battery hopefully trickling its voltage down.

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  • [–] 2 points 5 months ago*

    Again, that would increase cost significantly. I didn't think of this at first because my array doesn't have RSD because it's older but all new solar arrays in the US and elsewhere have what's called rapid shutdown technology for firefighter safety and it is a device that is mounted to each solar panel and does effectively reduce the output to zero or near zero on each solar panel in the event grid power is lost or somebody hits the rapid shutdown emergency button. So the technology is already in place to do what you're describing but more cost-effective and less elaborate.

    Also, something I should have mentioned is that newer inverters like my own, even though they are grid-tied, can be configured to export nothing and only power the home even without a battery. But the problem with this whole line of thinking is that it would screw over homeowners who should be getting money for the solar they put into the grid, but would be getting nothing in these scenarios.

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  • [–] 1 point 5 months ago

    That's exactly what is done. The electricity market operator orders solar farms to limit how much they generate, home solar gets told not to export any power, it is done automatically

    It is much easier to stop or limit solar power production compared to other technologies

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