The first thing you need to make sure is which type of power inverter would you like , grid-tie or off-grid. The configuration of the inverter should be determined according to the technical specifications of the whole photovoltaic power generation system and refer to the product sample manual provided by the manufacturer. The following technical indicators will also be given special consideration.
1. Rated output power
The rated output power indicates the capacity of the photovoltaic inverter to power the load. Photovoltaic inverters with high rated output power can carry more power load. When selecting a photovoltaic inverter, it should first consider having enough rated power to meet the requirement of the maximum load of the equipment to the electric power, as well as the expansion capacity of the system and the access of some temporary loads. When a pure resistive load from electrical equipment or power factor is greater than 0.9, generally choose the rated output power of the pv inverter than 10% 10% of the total power ` electrical equipment.
2. Output voltage adjustment performance
The output voltage adjustment performance indicates the output voltage stability of the photovoltaic inverter. General photovoltaic inverter products are given when the dc input voltage changes in the allowed range, the deviation percentage of photovoltaic inverter output voltage fluctuations, often referred to as voltage regulation. The high performance pv inverter should also give the deviation percentage of the output voltage of the pv inverter when the load changes from zero to 100%, usually called load adjustment rate. The voltage adjustment rate of the photovoltaic inverter with good performance should be less than or equal to plus or minus 3%, and the load adjustment rate should be less than or equal to plus or minus 6%.
3. Overall efficiency
The whole machine efficiency represents the power loss of the photovoltaic inverter itself. The high capacity pv inverter also gives the full load and low load efficiency. Generally, the efficiency of inverters under KW level should be over 85%. The efficiency of 10KW should be over 90%. Greater power efficiency must be above 95%. Inverter efficiency high and low for photovoltaic power generation system effective power and reduce power generation cost has important influence, so try to compare selects the photovoltaic inverter and select some products of the whole machine with high efficiency.
4. Start-up performance
The photovoltaic inverter shall be started reliably under rated load. The high performance photovoltaic inverter can be started at full load several times without damaging power switch devices and other circuits. For its own safety, small inverters sometimes adopt soft start or current limiting start measures or circuits.
The above are the main basis for the design and selection of pv inverter, as well as an important index to evaluate the technical performance of pv inverter.
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