What cost are we talking for batteries?Excess energy can go to storage batteries, Tesla Powewall being one type. Our local council has just started a group buy scheme for those who wish can join up and benefit from significant discounts on purchase and installation (not necessarily Tesla) . So one can still receive payment for excess generated electricity (in my case deemed to be 50% of the total generated) and store it for use later at home. Win, win
I am also paid at 50% generation but use as much as the max 25kw a day I can from my 11 panels (24.7kw today) - I need another 6 panels !
My bespoke software/hardware switches appliances on/off remotely as power becomes available. I still have times between switching that could be stored but the cost is just not worth it.
A neighbor of mine still has the old type meter which goes backwards when more power is available than used - the ultimate free battery storage...