We should be investing solar in lower income communities, as those people could really use cheaper utilities, and any saving they get would immediately go back into their communities.
One group has insufficiencies that need to be solved, the other, excesses. Lessening dependence on the grid for the ones for whom cost is not a barrier lowers costs for everyone.
Now, having some sort of solar community energy bank would eventually be novel, akin to the replaceable battery charge stations for electric scooters in the Pacific Islands. Take your high density 12VDC canisters up, slot them into the locking wells, and get a text when they're full. Dock them onto your appliance circuit when you're home, and enjoy grid-free power for your home or vehicle.