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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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On a smaller scale, you can use several gallons of water as a thermal buffer ("battery") for a greenhouse, grow tent or small room. No, it's not convenient to have gallons of water around, but it can be useful for growing things that need to stay in a specific temperature range over the course of a day.
For example, I'll be doing this for my mushroom grow tent as we get into winter here. (Lows of 35°F up to 80°F during the day.) Mycelium development and/or fruiting is partially controlled with temperature.