I wonder, how hard would it be to make a vacuum insulated oven like a big thermos flask?

I know this is “low-tech” but still think it might be possible to fabricate something even if it means spending some of your power budget maintaining the vacuum with a pump.

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jacknews 4 days ago | parent [-]

maybe vacuum insulated panels.

A big thermos would be much more challenging, though there are already long vacuum bottles/tubes used as solar cookers.

	▲	kragen 4 days ago \| parent [-]
		I have in fact cooked eggs at night by running water over them that was heated in such vacuum-insulated-tube collectors, then held in an insulated tank. This used to be an economical way to get hot water when PV was more expensive.