@sharpener thank you for a prompt reply.
420m2 new build with good level air tightness and insulation (passive level but no accreditation). Mvhr, ASHP still to be connected up. Pv diverter. 8m2 solar thermal. 20kw log boiler. (heating system overkill) Probably end up with a electric van being eyeing up the vw id buzz.
Current PV set up in roof approx 4.2kw with a 3.68kw inverter. Very basic sma inverter. Would like to at least double PV size with battery storage and be able to add more battery capacity at a later date. Would be adding different orientation of panels to existing so get a but more output in the evening.
Was originally thinking of ditching inverter and using a hybrid inverter.