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Photovoltaic inverters are the main components and important components of solar photovoltaic power generation systems. In order to ensure the normal operation of solar photovoltaic power generation systems, the correct configuration and selection of photovoltaic inverters becomes important. The configuration of the inverter shall be determined in accordance with the technical specifications of the entire photovoltaic power generation system and with reference to the product catalog manual provided by the manufacturer. In general, we must also consider the following technical indicators.
1, rated output power
The rated output power represents the ability of the photovoltaic inverter to supply power to the load. Photovoltaic inverters with high rated output power can bring more power loads. When selecting a PV inverter, first consider that it has enough rated power to meet the requirements of the equipment for electrical power under the maximum load, as well as the expansion of the system and the access of some temporary loads. When the electrical equipment is made of pure resistive load or the power factor is greater than 0.9, the rated output power of the photovoltaic inverter is generally selected to be 10% and 15% greater than the total power of the electrical equipment.
2, the output voltage adjustment performance
The adjustment performance of the output voltage indicates the voltage regulation capability of the photovoltaic inverter output voltage. In general, PV inverter products are given the percentage deviation of the output voltage of the PV inverter when the DC input voltage is allowed to fluctuate, which is usually called the voltage regulation rate. High-performance photovoltaic inverters should also give the percentage deviation of the PV inverter output voltage when the load changes from zero to 100%, which is usually called the load regulation ratio. The voltage regulation rate of a photovoltaic inverter with good 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 power loss of the photovoltaic inverter itself. Large-capacity photovoltaic inverters also have to give full efficiency and low-load efficiency. Generally, the efficiency of inverters below KW level should be 80%~85%; the efficiency of 10KW level should be 85%~90%; the efficiency of greater power must be above 90%~95%. The efficiency of the inverter has a significant impact on the photovoltaic power generation system to increase the effective power generation and reduce the cost of power generation. Therefore, it is necessary to compare the photovoltaic inverters and choose products with higher efficiency.
4, start performance
PV inverters should be guaranteed to start reliably under rated load. A high-performance photovoltaic inverter can be started multiple times in full load without damaging power switching devices and other circuits. Mini-inverters 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 photovoltaic inverters and an important indicator for evaluating the technical performance of photovoltaic inverters.
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