The role of box-type transformers in photovoltaic power generation, and what conditions need to be met before it can be integrated into the national grid, such as how many volts the voltage must reach

If the electricity generated by solar energy is to be integrated into the grid, a photovoltaic grid-connected inverter is required to convert the DC power generated by the solar panels into AC power with the same voltage as the grid and feed it into the grid. It can only be incorporated after applying to the local water conservancy bureau for approval. Household power generation systems generally consist of photovoltaic arrays composed of solar cell modules, solar charge and discharge controllers, battery packs, off-grid inverters, DC loads and AC loads. If the output power supply is AC 220V or 110V, an inverter is also required.