Which battery solution to choose for a existing oversized PV?

I have a big roof solar. It has 63 kW peak. It was built “as an investment” back when you could get a contract lasting 20 years that guaranteed a fixed much above market price per kWh. So it was built as big as possible. The roof is filled completely. Now the contract will end soon and we want to use the energy to power the house. To continue selling the power is not worthwhile (you get next to nothing). So first power the house – then feed the excess to the grid @ 8 Cent per kWh. The system has 11 SMA tri power inverters that can only feed into the grid.

• Option 1: hybrid inverters and a battery – I could buy only 1 and connect existing strings or replace all inverters. But that would be expensive.

• Option 2: getting an “AC battery” – It would be cheaper and easier to implement but erffiecency is worse.

GOAL: Be as independent from the grid as possible at reasonable cost. In spring, summer and autumn there would be enough power from even one hybrid inverter + battery I guess. But in winter when there is not much power produced it would be nice to use the whole potential of the 63kW peak in order to buy as less power as possible from the energy provider. My guess is it would be best to just get an AC battery. Do you know better solutions?