What Should Be Paid Attention to in the Selection of Photovoltaic Inverters

What Should Be Paid Attention to in the Selection of Photovoltaic Inverters

Photovoltaic inverter is the main component and important part of photovoltaic power generation system. In order to ensure the normal operation of photovoltaic power generation system, the configuration and selection of photovoltaic inverter is more important. In addition to determining the configuration of photovoltaic inverters based on various technical indicators of the entire photovoltaic power generation system and referring to the product manual provided by the manufacturer, the following technical indicators should also be considered.


1. Rated output power

The rated output power indicates the ability of the PV inverter to supply power to the load. A photovoltaic inverter with high rated output power can drive more loads. When selecting a photovoltaic inverter, you should first consider having sufficient rated power to meet the electrical power requirements of the equipment under the maximum load, as well as system expansion and some temporary loads. access. When the electrical equipment is dominated by pure resistive loads or the power factor is greater than 0.9, the rated output power of the photovoltaic inverter is generally selected to be 10%-15% greater than the total power of the electrical equipment.

2. Adjustment performance of output voltage

The adjustment performance of the output voltage indicates the voltage regulation ability of the output voltage of the photovoltaic inverter. Generally, photovoltaic inverter products give the percentage of fluctuation deviation of the output voltage of the photovoltaic inverter when the DC input voltage changes within the allowable fluctuation range, which is usually called the voltage adjustment rate. A high-performance photovoltaic inverter should also provide the deviation percentage of the output voltage of the photovoltaic inverter when the load changes from zero to 100%, which is usually called the load regulation rate. The voltage adjustment rate of a photovoltaic inverter with excellent performance should be less than or equal to ±3%, and the load adjustment rate should be less than or equal to ±6%.


3. Machine efficiency

The overall efficiency indicates the power loss of the photovoltaic inverter itself. For photovoltaic inverters with larger capacity, the efficiency values under full load and low load operation should also be given. Generally, the efficiency of inverters below KW level should be 80%-85%; the efficiency of 10KW level inverters should be 85%. -90%; the efficiency of higher power must be above 90%-95%. The efficiency of the inverter has an important impact on the photovoltaic power generation system to increase the effective power generation and reduce the cost of power generation. Therefore, the selection of photovoltaic inverters should be compared as much as possible, and the product with higher overall efficiency should be selected.

4. Startup performance

Photovoltaic inverters should be guaranteed to start reliably under rated load. High-performance photovoltaic inverters can be started at full load for many times without damaging power switching devices and other circuits. Small inverters sometimes use soft-start or current-limited start-up measures for their own safety.

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