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First determine grid or off-grid. In addition to the configuration of the inverter according to the technical indicators across the photovoltaic system and the reference sample product manuals provided by the manufacturer to determine. Also consider the following general focus on several technical indicators.
1. the rated output power
Rated output power capability represents photovoltaic inverter to supply the load. Rated output power of PV inverters can bring more electricity load. PV inverter selection should be the first consideration has sufficient power rating to meet the expansion of the maximum load of equipment for electrical power requirements, as well as the system load and temporary access. When the electrical equipment for a living purely resistive load or power factor greater than 0.9, generally selected PV inverter rated output power than the total electrical power equipment 10% to 15% `.
2. tune the performance of the output voltage
Performance tuning of the output voltage regulation capability represents PV inverter output voltage. Usually PV inverter products are given when the DC input voltage fluctuation in the allowable fluctuation range, the PV inverter output ripple voltage deviation percentage, commonly referred to as voltage regulation. High-performance photovoltaic inverter should also be given when the load is zero to 100% of the change by the photovoltaic inverter output voltage deviation percentage, commonly referred to as load regulation. Excellent performance photovoltaic inverter voltage regulation should be less than equal to ± 3%, load regulation is less than or equal to ± 6%.
3. the overall efficiency
Overall efficiency of photovoltaic inverters indicates the size of its own power consumption. Large capacity PV inverter efficiency values also given full load and low load of work. KW inverter below the rank of general efficiency shall be not less than 85%; 10KW level of efficiency should be 90% or more; more power efficiency must be above 95%. Inverter efficiency of photovoltaic power generation system to improve the level of effective power generation and reduce the cost of electricity has an important impact, so use photovoltaic inverter to try to compare, choose a high overall efficiency of some products.
PV inverter should ensure reliable starting under rated load. High-performance photovoltaic inverter can be done several times in succession at full load start without damaging the power switching devices and other circuit. Small inverters for their own safety, sometimes soft start or start limiting measures or circuitry.
More than a few as the main basis for photovoltaic inverter design and purchase, as well as evaluation of PV inverter technology important indicator of performance.
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