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Batteries aren't the only way to store energy. Here's another. - Technology Connections
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this post was submitted on 08 Oct 2023
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That being said, Technology Connections does a great deep dive into numerous topics and he is a fun host. Most videos, while very long, are great edutainment.
Yes, there's a lot in there. I wish his side mention of having an insulated box of bricks that is heated up during the night and opened to heat the house during the day had more information.
This concept was already actively used but mostly abandoned. A friend of mine has a (in Germany) so called "Nachtspeicher Heizung" (lit. translates to night storage heating), the English term is storage heater. https://en.wikipedia.org/wiki/Storage_heater
It is an electric heating system that has high heat capacity stones in it. If you turn it on it will use a fan to output hot air. It was invented to use the overproduction of fossil fuel plants during the night when demand was low. They have a separate meter and cheaper tariffs. With the switch to renewables they could have a second chance.
I believe the main challenge is making then somewhat smart to only store when the energy is cheap, in the past it was a very simple time based system.