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But, apart form installation costs, a low voltage DC power network inside homes might make sense (e.g. 12V or 24V). There's a lot of modern electronics that doesn't depend on the regular powerline voltage anymore. Unifying their power supplies into a central unit should have some benefits.

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> a low voltage DC power network inside homes might make sense (e.g. 12V or 24V).

It wouldn't work. The needed wires would be like garden hoses.

Yup, there's a reason even POE is 48 volt in a lot of applications

I recall seeing somebody that did exactly that, largely because it was way more efficient for solar setups. It is a bit ridiculous to take DC power from solar panels, convert to AC power, then plug a standard home electronic power supply into it which... converts it back to DC.

Might not work for everything (eg, refrigerator? Microwave?) but it could be worthwhile to run a secondary DC network.

It will certainly not work for devices with high power requirements. So ovens, washing machines, etc. are out. But computers, TVs, routers, phone chargers and all the other small stuff might profit.

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