To make solar power viable, we need a solution for overnight energy storage.
Batteries are complicated.
Do you know what isn't? Water go up. 
To make solar power viable, we need a solution for overnight energy storage.
Batteries are complicated.
Do you know what isn't? Water go up.
The amount of energy stored from raising a very heavy block up is not that much.
About 7kwh if you replaced an elevator with a block of lead in a 10story building
So yeah not much