Nominally, yes, but the actual economical value of doing so is most likely an order of magnitude below what buying the power would cost (sun shining and grid ne

Nominally, yes, but the actual economical value of doing so is most likely an order of magnitude below what buying the power would cost (sun shining and grid needing more power is only loosely correlated, and batteries take significant time to pay off). Subsidies have a large impact here though.