How to select an inverter with high power output

In the photovoltaic power plant system, the inverter costs less than 8%, but it is a power generation efficiency of the decision-maker in photovoltaic power plants, when exactly the same components and other accessories, choose a different inverter, the system's total power generation capacity 5% to 10% of the difference. After successful installation of energy generation system, the inverter has become a decisive factor. So an experienced manufacturer, would choose a high total generating capacity inverter, the increased efficiency of the entire system.

The relatively high content of inverter technology that integrates electrical, electronic, structural, thermal design, control as a whole. Manufacturers and plant owners to make EPC dc to ac power inverter have become experts, is clearly not possible. In this paper, the basic parameters of the inverter "output voltage", so that we understand the inverter parameters are different because of this case, the amount of power the inverter of the change.

Now the domestic power plant inverter, the output voltage is 270V and 315V are two common 270V output power level has 250KW, 400KW, 500KW, common 315V output power level has 315KW, 500KW, 630KW. From the standpoint inverter, 315V inverter output 630KW, 500KW hardware and 270V output inverter exactly the same. So the same power level inverter, 315V output voltage of inverter output voltage than 270V inverter costs are about 20% lower, and the higher the voltage, the smaller the current, the efficiency will be higher.

But from the system generating capacity considerations, to take full advantage of solar modules, inverters crystal Fuyuan R & D engineers recommend choosing 270V output inverter. Because the inverter to carry out the project before the crystal Fuyuan research engineer told photovoltaic power plants at home and abroad more than 50 on-site visit, I found 630KW inverter generating capacity and no more than 20% more 500KW inverter. Only less than 15% increase.

Through theoretical analysis and field analysis, we found 630KW inverter MPPT range from 500V to 820V, and 500KW on grid inverter MPPT range is 450V to 820V. This is the middle 50V voltage difference, generally through a multi-string twelve components to solve. But in fact, encounter rainy days, the voltage between 450V to 500V still have more time. So the total power generation time, which is 10% more than the former.