Plenty of cheap inverters - design your system to run at higher voltages. Run your panels in series to get to ~120V first, then get a simple switch inverter sin

Plenty of cheap inverters - design your system to run at higher voltages. Run your panels in series to get to ~120V first, then get a simple switch inverter since you're already matching (in North America where I am) your mains voltage, those inverters are cheaper and usually more efficient. Then you feed that into your MPPT, which should have the step-down for 12V battery charging and cleaning the input 120VAC power..