Photovoltaic Inverter Solutions
PV inverters (PV inverters or solar inverters) convert the variable DC voltage generated by photovoltaic (PV) solar panels into mains frequency alternating current (AC) inverters, which can be fed back into commercial transmission systems or used by off-grid grids. The photovoltaic inverter is one of the important system balance (BOS) in the photovoltaic array system, which can be used with general AC power supply equipment. Solar inverters have special functions with photovoltaic arrays, such as maximum power point tracking and islanding protection.
Solar inverters can be divided into the following three categories: stand-alone inverters:
used in stand-alone systems, photovoltaic arrays charge batteries, and inverters use the battery's DC voltage as an energy source. Many independent inverters also incorporate a battery charger that can charge the battery with AC power. Generally, this inverter does not come into contact with the grid, so there is no need for islanding protection function.
Grid-tie inverters: The output voltage of the inverter can be sent back to the commercial AC source, so the output sine wave needs to be the same as the phase, frequency and voltage of the power supply. The grid-connected inverter will have a safety design and will automatically turn off the output if it is not connected to the power supply. If the grid power supply jumps, the grid-connected inverter does not have the function of backup power supply.
Battery backup inverters are special inverters that use the battery as its power supply, with the battery charger to charge the battery, if there is too much power, it will be fed back to the AC power end. This kind of inverter can provide AC power to the specified load when the grid power supply jumps, so it needs to have an islanding protection function.