Introduction To The Basic Technical Parameters Of Photovoltaic Inverters
Jan 06, 2023
Photovoltaic inverters can convert the variable DC voltage generated by photovoltaic solar panels into mains frequency AC inverters, which can be fed back to the commercial system or used for off-grid grids. The photovoltaic inverter is one of the important system balances in the photovoltaic array system, and it can be used with general AC power supply equipment. Let me introduce the basic technical parameters of photovoltaic inverters.
First of all, it is necessary to determine whether it is a grid-connected photovoltaic inverter or an off-grid photovoltaic inverter. The configuration of the inverter should be determined according to the various technical indicators of the entire photovoltaic power generation system and by referring to the product sample manual provided by the manufacturer. Generally, 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. Photovoltaic inverters with high rated output power can carry more electrical 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 the expansion of the system and the access of some temporary loads. When the electrical equipment is based on purely 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 operation and low-load operation should also be given. Generally, the efficiency of inverters below KW class should be above 85%; the efficiency of 10KW class inverters should be above 90%; the efficiency of higher power inverters must be above 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 or circuits for their own safety.
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