It's a very cool, back to basics approach. To me it sounds like building a solar freezer makes its own ice (not literally), so it's an ice box when there's no power. When it comes to "when all you have is a hammer" type thinking, HN tends to use high-tech, trendy approaches as its hammer. Sometimes taking a step backwards and looking to simpler solutions gives us the better approach. I read the phrase "once battery technology improves" so much on articles about solar power I've become numb to it, so I found this a refreshing read.

Looks very interesting. Is this you? What are the physical dimensions (LxWxH) of say 5 kWh and 10 kWh batteries?

Edit: Okay, found it [1]. For 2.7KWh it is Height 929mm, Width 313mm, Depht[sic] 329mm. That's large but definitely within acceptable usage.

Follow up question: What are stacking limitations? How much clearance do you need between different two modules or wall and module? Can you stack vertically?

[1] https://www.bluesky-energy.eu/en/salt-water-battery-aib-tech...