The photovoltaic inverter chassis has perfect protection functions, and the system reliability is higher. It can connect to 8 photovoltaic series, and the maximum current of a single channel is 10A; The cabinet is made of hot-dip galvanized steel plate, the cabinet structure is safe and reliable, has sufficient mechanical strength, and has a current monitoring module inside. The protection level is IP65, which is waterproof, dust-proof, rust-proof, and salt-fog-proof, meeting the requirements of outdoor installation; It can be made according to the different needs of customers, and can also be made according to the drawings provided by customers. The combined grid-connected inverter power supply adopts a low-frequency isolation transformer or a high-frequency isolation transformer design, and is an outdoor design. The power size is suitable for small photovoltaic power stations. Multiple inverters can be operated in parallel to simplify the design of the power station. The combined grid-connected inverter power supply adopts a low-frequency isolation transformer or a high-frequency isolation transformer design, and is an outdoor design. The power size is suitable for small photovoltaic power stations. Multiple inverters can be operated in parallel to simplify the design of the power station.