battery storage

I am in UK have a 1800 Watt panels on rear shed about 220 volts feeding a SB1700 grid tie, i want to change the inverter and add batteries ( 4-9kw) I want solar generated first to use in home and when home has no load the excess to charge battery , battery can be used when solar not generating and any excess still fed back to grid, I do not want to charge battery from grid
Can anyone recommend inverter and batteries please (i also have 3 other grid tie systems about 1Kw each in different loications Front and rear roof conservatory roof)