PV inverter is key component for connecting photovoltaic arrays and power grid. Its efficiency not only affects their own losses, but also affects the capacity selection and configuration of photovoltaic converters and other equipment in the system. We mainly distinguish the quality of photovoltaic inverters from the following aspects:
1. Installation scale
Inverters of different models and capacities are selected according to the size of the power station. Large-scale ground power plants generally use centralized inverters. Small-scale rooftop power plants, industrial parks, or small-scale photovoltaic power generation systems in public facilities generally can choose string inverters or micro inverters.
2. Stability and reliability
The inverter only accounts for 11% of the cost of the photovoltaic system, the cost is not high. However, in the subsequent operation and maintenance, the after-sales problem of the inverter accounts for about 50% of all after-sales problems. It is obvious how important it is to choose a safe and reliable inverter.
Inverters of different brands have different efficiency, among which the efficiency of inverters in Europe and America is the highest, and the Europe efficiency reaches 97.2%.
Efficiency of domestic inverter is below 90%. The efficiency of the inverter also affects the price of the inverter. The higher the efficiency, the more expensive the price is. The efficiency of the inverter is very important. The higher the efficiency, the less energy is wasted on the inverter and the more power is generated.
4. After-sales service and design services
Different brands of inverters on the market have set different after-sales and design services according to customer requirements. However, in general, high-profile inverters have higher after-sales and design service quality, which guarantees the subsequent operation and maintenance of the inverter.
5. Load type
When selecting an inverter, first ensure that there is sufficient capacity to meet the power requirements at maximum load. When the inverter is loaded with multiple devices, the selection of the inverter capacity should consider the possibility that several consumers will work at the same time, that is, the "load simultaneous coefficient".