I could be wrong, but I read totalizing as totalitarian

Just to be clear, you need to live in a place that allows balcony solar or direct plug into wall systems. If you’re in Germany or most of Europe, you’re probably fine, but only Utah in the USA has approved these systems.

I think ecoflow has options to charge from the grid and discharge later. It’s called time of use rates. I know it’s on their regular power stations and the smart electrical panel but not 100% certain it’s on their balcony solar line called ‘stream’. They also have manual and automatic settings to charge up from the grid before large storms, that you might be able to hack to accomplish your goal