this post was submitted on 17 Sep 2025
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Neat breakdown with data + some code.

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[–] humanspiral@lemmy.ca 1 points 2 hours ago

you really need scale for sand batteries to work

Not at all. First, (hot) water batteries are excellent for home heat storage. Sand/dirt is even more storage per volume required, and completely complimentary in sending hot water through it (pipes) to make it hotter. No combustion heat means less air exchanges, and a 300C rock/dirt/sand pit has losses that radiate through house.