Presumably you can discharge the batteries while pv is also producing at full tilt.
But that'll rarely happen.
I absolutely hate the current state of energy reporting in general. The writers of these articles are not even trying to make sure they report accurately.
E.g. the battery stats: Is it MW or MWH? Both are very different and the distinction is important. A battery that can deliver 380MW but only for 10 mins is pretty useless.
This is the EIA. They are in charge of pretty much all energy tracking in the US. They are reporting the right units, and if they seem wrong, it's because the numbers are being used for something useful, but perhaps different than what you have in mind.
(That said, I do dislike units like BTU or "billions of kWh," but they are at least correct units for the quantity measured)
But that'll rarely happen.
I absolutely hate the current state of energy reporting in general. The writers of these articles are not even trying to make sure they report accurately.
E.g. the battery stats: Is it MW or MWH? Both are very different and the distinction is important. A battery that can deliver 380MW but only for 10 mins is pretty useless.