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Choose PV Inverter For Solar Power System

Author: Source: Datetime: 2017-01-06 14:00:10

In order to ensure the normal operation of PV power system, it is important to choose the correct configuration of PV inverters. PV inverters are the main components and important components of solar PV systems. In addition to the configuration of the inverter in accordance with the technical specifications of the entire photovoltaic power generation system and reference to the manufacturer's product samples to determine the manual. The general focus should also consider the following several technical indicators.

Choose PV Inverter For Solar Power System

1, Rated output power
The rated output power represents the capacity of the PV inverter to supply power to the load. PV inverters with high rated output power can carry more electrical loads. The choice of PV inverters should first consider a sufficient power rating to meet the maximum load of equipment under the power requirements, as well as the expansion of the system and some temporary load access. When the electrical equipment to pure resistive load for a living or power factor greater than 0.9, the general selection of photovoltaic inverter rated output power than the total power consumption of equipment 10% to 15%.

2, The output voltage adjustment performance
The output voltage regulation performance indicates the voltage stability of the PV inverter output voltage. General PV inverter products are given when the DC input voltage fluctuation range to allow fluctuations in the photovoltaic inverter output voltage fluctuations in the percentage of deviation, usually referred to as voltage regulation. High-performance PV inverters should also give a percentage deviation of the output voltage of the PV inverter when the load changes from zero to 100%, commonly referred to as load regulation. The voltage regulation of PV inverters with excellent performance should be less than or equal to ± 3% and the load regulation rate should be less than or equal to ± 6%.

3, Machine efficiency
The whole efficiency represents the power loss of the PV inverter. Large capacity PV inverters also give full-load operation and low-load operation efficiency. General KW level below the inverter efficiency should be 80% to 85%; 10KW class efficiency should be 85% to 90%; more high-power efficiency must be 90% to 95%. Inverter efficiency level of photovoltaic power generation system to improve the effective power generation and reduce power generation costs have an important impact, so the selection of photovoltaic inverter to try to compare, select the higher efficiency of the whole machine products.

4, Start performance
PV inverters should ensure reliable starting at rated load. High-performance photovoltaic inverter can be done several times at full load start without damaging the power switching devices and other circuits. Small inverters for their own security, sometimes using soft-start or current-limiting start-up measures or circuits.
Choose PV Inverter For Solar Power System
PV industry from Europe, Australia, and now China has become a popular industry, just a few years, the domestic PV inverter manufacturers such as the birth of spring, but how to choose solar inverters, or have a certain standard.

The first consideration is the scale of photovoltaic power plants, the family or business, but the formation of solar photovoltaic power station in the country is still relatively small, mainly housing conditions and other restrictions, can not install portable solar power generator panels, factories and enterprises is still very advantageous. Small household PV power station is mainly for foreign villa installation.

The second consideration is efficiency. Efficiency that direct point is the root of the amount of electricity directly linked, so now more and more photovoltaic inverter manufacturers on the efficiency of the inverter as the main technical advantages to research and development, Omnik new energy micro-inverter in Germany Photon efficiency test Ranked first in Europe, see the Photon test comparison results.

Finally, consider the reliability. PV grid-connected power generation system converts the direct current generated by solar cells into an AC power of the same frequency as the grid voltage, and realizes a system that supplies power to both the load and the grid. PV grid-connected power generation system is mainly composed of photovoltaic array, grid-connected inverter, controller and relay protection device. PV arrays are the main components of photovoltaic grid-connected power generation system, which directly converts the received solar power batteries energy into electrical energy. The current application of the photovoltaic array is generally a certain number of crystalline silicon solar cell components in accordance with the requirements of the system voltage string, parallel composition.

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