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Non-lithium energy storage is probably the best theoretically, e.g. https://en.wikipedia.org/wiki/Gravity_battery

I did mathhs on it. To cope with daily peaks of generation and usage, a family that spends modest 100-150 kW*h/mo will need a 30-meter tall tower and a 5*5*5 meter cube of concrete inside as a load. Not to mention mechanisms to drive this up and down. Just one household! Which is completely unfeasible for an apartment building.*

Pareto principle - optimize for 80% of the load and you probably can get by with 20% of the effort.

Connect a few V2G cars to the apartment building as well to soak up the excess supply in the daytime and demand at night, and pretty soon we have a robust solution.

> Connect a few V2G cars to the apartment building as well to soak up the excess supply in the daytime and demand at night, and pretty soon we have a robust solution.

V2G (or generally, electric) cars are absurdly expensive even in Western countries.

Fully agree, but if we put in the groundwork now to be able to connect these cars to give back to the grid now, they can already help in peak load situations.

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