In the process of building photovoltaic power plants, how to get the maximum benefit (power generation) under the minimum investment, choose what type of PV inverter has also become a very important link, expensive is not necessarily right for you the best. First, the selection of photovoltaic inverter is very important In the end how to choose their own photovoltaic inverter station, the following is the different types of photovoltaic inverter in the power station in the use of analysis. 1, centralized inverter Equipment Requirements Need to configure the transformer, refrigeration and ventilation equipment, including equipment, confluence boxes, inverter room and other cumbersome equipment ã€Panel Requirements】 â‘ , the number of tandem solar panels need to be consistent Strict requirements on the size of the installation site, individual panels damage huge impact on the entire power plant â‘¡, all panels tilt angle needs to be consistent The installation of personnel, installation conditions, installation of equipment demanding â‘¢, the size of the battery model needs exactly the same Inconsistency could lead to serious power plant failures or power generation declines â‘£, bulky, complex installation, power plant design needs to follow the above conditions, the entire photovoltaic power plant can achieve maximum power, all panels can work at the maximum power point 2, string inverter â‘ , simple design, different MPPT input serial battery panel, you can use a different number, type, brand of solar panels â‘¡, AC can be more direct access to the client â‘¢, a Taiwan inverter failure, can no longer affect other inverters under normal circumstances, the use of after-sales spare parts on-site replacement, manual replacement, to ensure the continuity of power plant â‘£, to minimize the transportation and installation costs 3, micro-inverter â‘ , the basic need to install, can be directly integrated in the battery board â‘¡, when a panel is damaged or blocked, it will not affect the normal operation of other inverters â‘¢, plug and play AC, transport and installation costs are very low â‘£, when a fault occurs, only need to replace a single fault machine can be ⑤, the maximum DC voltage is only 40V, more secure â‘¥, the service life of up to 25 years Second, the key technical indicators: As a main component and an important part of a solar photovoltaic system, a photovoltaic inverter can ensure the normal operation of a solar photovoltaic power generation system. It is important to correctly configure and select a photovoltaic inverter. In addition to the configuration of the inverter based on the entire photovoltaic power generation system, the technical indicators and refer to the manufacturer's product sample manual to determine. In general should also consider the following key technical indicators. 1, rated output power Rated output power represents the ability of the PV inverter to supply power to the load. PV inverters with high rated output power can carry more electricity load. The selection of photovoltaic inverter should first consider having sufficient rated power to meet the equipment under maximum load on the electrical power requirements, as well as system expansion and temporary load access. When the electrical equipment to a purely 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 by 10% `15%. 2, the output voltage adjustment performance The output voltage regulation performance indicates the voltage regulation capability of the PV inverter output voltage. General PV inverter products are given when the DC input voltage fluctuations in the allowable range, the PV inverter output voltage fluctuations in the percentage deviation, commonly referred to as voltage regulation. High-performance photovoltaic inverter should be given when the load changes from zero to 100%, the percentage deviation of the PV inverter output voltage, commonly referred to as load regulation. Excellent performance of the PV inverter voltage regulation rate should be less than or equal to ± 3%, the load regulation is less than or equal ± 6%. 3, machine efficiency Total efficiency of the photovoltaic inverter that the size of their own power loss. Larger PV inverters should also give efficiency values ​​at full load and at low load. In general, the efficiency of inverters below KW level should be over 85%; the efficiency of 10KW level should be above 90%; the efficiency of more powerful power must be over 95%. Inverter efficiency level of photovoltaic power generation system to improve the effective power generation and reduce the cost of power generation have a significant impact, so the choice of PV inverters to try to compare, select the machine more efficient products. < 1 2 >