Off grid inverter makes is dedicated to solar and wind power systems makes.
Off grid inverter are generally divided into photovoltaic grid-connected inverters, wind power grid-connected inverters, grid-connected inverters for power equipment and grid-connected inverters for other power generation equipment. The main features of grid-connected inverter are high power and low cost.
Grid-connected inverters are generally used in large photovoltaic power station systems. Multiple parallel photovoltaic groups are connected in series to the dc input terminal of the same centralized inverter. In general, three-phase IGBT power module is used, small power field effect transistors are used, and DSP conversion controller is used to improve the quality of power generation, so that it is very close to the sine wave current.
The module inverter connects each photovoltaic module to an inverter, and each module has a separate maximum power peak tracking, so that the module and the inverter work better. It is usually used in photovoltaic power stations of 50W to 400w, and its total efficiency is lower than that of series inverters.
This increases the complexity of ac side connections and makes them difficult to maintain due to the parallel connection of ac. Another problem need to be solved is how to more effectively link power grid, a simple method is to communicate directly by ordinary socket connection, this can reduce the cost and equipment installation, but usually the grid safety standards may not be allowed to do so, power companies may object to connect directly to power generation equipment and the ordinary families user normal socket. Another safety-related factor requires the use of isolating transformers (High frequency power inverter or low frequencies) or allows the use of transformerless inverters. The off grid inverter is widely used in photovoltaic grid-connected inverter, glass curtain wall and solar power off grid inverter.