Use an EI or toroidal transformer with a 12V center-tap primary and a 220V secondary. Ensure the core supports the target power output–typically 300–1000W–without saturation. If you use ferrite cores, adjust the switching frequency between 20 kHz and 50 kHz to reduce audible noise.
[pdf] In this blog post, we will guide you step by step to build a 150W inverter using the SG3525 PWM controller and IRF3205 MOSFETs. This inverter can efficiently convert 12V DC from a battery into 220V AC, which can be used to power household appliances like lights and small fans.
[pdf] 10200W pure sine wave hybrid inverter with up to 95% efficiency seamlessly converts 48V DC to 220V AC power and vice versa. Compatible with the grid, solar panels, and generators, it offers versatile power options.
[pdf] 
