Had problem of in summer exporting spare electric. Sometimes house load was more than solar output so had to buy day time and over night electric. Have just had Powerwall 2 fitted.
My summer usage has dropped to £0.02 day. Finding that I can charge my EV car free also.
If needed powerwall 2 can charge from grid at any time of day or night. Helps grid and cut my electric cost but at £9800 fitted my take time to pay for its self. The most important thing to me allowing me to cut my carbon output. So do we need fossil fuels, just south facing roof and British sunshine. Sorry title should be “ Get more from solar bank” Stupid forum wont let me change it😥