How to choose grid-connected solar inverter?

   Grid-connected solar inverter are an important and complex part of solar panel generator kit. Stable solar panel generator kit require a stable solar inverter.

    To select an solar inverter, you must first determine whether it is connected to the grid or off-grid. Off-grid solar panel generator kit use off-grid solar inverter, and grid-connected solar panel generator kit use grid-tied solar inverter. The configuration of the grid-connected solar inverter should be determined according to the technical indicators of the entire solar panel generator kit and with reference to the product sample manual provided by the solar system manufacturer. Generally, the following technical indicators should be considered:

1. Rated output power.

   The rated output power represents the ability of the auto power inverter to supply power to the load. A auto power inverter with a high rated output power can carry more power loads. When selecting a auto power inverter, it should first consider that it has sufficient rated power to meet the requirements of the equipment for electric power under the maximum load, as well as the expansion of the solar power inverter kit system and the access of some temporary loads. When the electrical equipment is a purely resistive load or the power factor is greater than 0.9, the rated output power of the auto power inverter is generally 10% to 15% larger than the total power of the electrical equipment.

2.The output voltage adjustment performance.

      The output voltage adjustment performance represents the voltage regulation capability of the solar power inverter output voltage. In general, solar power inverter products give the percentage deviation of the output voltage of the solar power inverter when the DC input voltage varies within the allowable fluctuation range, which is usually called the voltage adjustment rate. A high performance solar power inverter should also give the percentage deviation of the output voltage of the solar power inverter when the load changes from zero to 100%, commonly referred to as load regulation. The voltage regulation rate of a best power inverter with excellent performance should be less than or equal to ±3%, and the load regulation rate should be less than or equal to ±6%.

3. The overall efficiency

       The overall efficiency represents the magnitude of the power loss of the best power inverter itself. Larger best power inverter also give efficiency values for full-load operation and low-load operation. Generally, the efficiency of best power inverter below KW should be more than 85%; the efficiency of 10KW should be more than 90%; the efficiency of higher power must be above 95%. The efficiency of the best power inverter has an important impact on the solar power inverter kit to increase the effective power generation and reduce the power generation cost. Therefore, the best power inverter should be compared as much as possible, and the product with higher efficiency should be selected.

  4.Start performance.

     The best power inverter should be guaranteed to start reliably under rated load. High-performance pure sine inverter can be used for multiple full-time startups without damaging power switching devices and other circuits. Small pure sine inverter sometimes use soft start or current limiting start-up measures or circuits for their own safety.

    The above are the main basis for the design and purchase of pure sine inverters, and also an important indicator for evaluating the technical performance of pure sine inverters.