Solis Seminar: Inverters Safety and Reliability

As the core energy conversion equipment of solar photovoltaic (PV) systems, the safe and efficient operation of the inverter determines the reliability of the entire system. So what determines the the safety and reliability of an inverter? In this document, we will look at inverter reliability from three aspects: design, evaluation and production management.

1. Design Reliability

The design reliability of solar PV inverters is mainly influenced by:
· Component Selection
The safe operation and lifespan of an inverter are closely related to the quality of its components. High-quality components are proven to have superior performance under environmental stress and resistance. This quality directly determines the performance and life of the inverter.
Solis will only ever source the highest quality components for its products and this is integral to the product development processes. . Through efficient and stable supply channels and relationships with global branded suppliers, Solis is able to maintain a consistent supply of key components.

· Thermal Performance Design
Thermal design is the most critical part of the inverter, because temperature directly affects the life and operating performance of the inverter.In terms of component use and design, Solis only selects components with a long lifespan and excellent heat resistance. Key components such as capacitors and IGBTs account for more than 20% of the design so choosing the right supply partner is critical.

Overheating can negatively affect performance of an inverter more than anything else. The “heat dissipation” design within an inverter is not the same in all inverters. , The heat dissipation area within Solis inverters, is about 1.5 times that of other conventional products.
Internal heat circulation design is also a factor. There is enough space around the internal spoiler fan of Solis inverters, so that the internal air convection can be fully circulated. This increases the heat exchange efficiency between the heat sink and the casing, and improves the overall heat dissipation effect.

The following image shows the thermal simulation of the Solis-110K-5G inverter in operating mode. Through the effective coordination of internal and external cooling fans, the overall heat dissipation performance of the inverter is excellent.

In addition, this high-power inverter with “intelligent redundant air cooling” and heat dissipation technology, (through intelligent control of the working state of the fan and the radiator), can not only ensure the excellent high temperature operating performance of the inverter, but also improve the effectiveness of the working time of the fan; greatly extending the service life of the fan, and ultimately, the inverter.

· Protection Design
Suitable protection levels are also an important guarantee for the inverter to be safe and reliable. The Solis inverter has IP65 protection level, which completely prevents dust from entering the unit and prevents water from entering at any angle. The internal PCB board and components are sprayed with three coats of anti-corrosion, to further improve the product protection level. (After the test, there is no water inside the inverter. With “power-on” the inverter is operating normally)

·System Monitoring and Protection Functions
The integration of system monitoring and protection functions is also an important part of the inverter's safety and reliability. These monitoring and protection functions can also effectively ensure the safety of the PV system. Solis inverters have a complete monitoring and protection function design, which includes:

2. Reliability Assessment
· Comprehensive Reliability Test
Through the comprehensive internal reliability test, the inverter performance and failure rate can be evaluated. Solis has complete and comprehensive in-house reliability test equipment, evaluation methods and processes to promote production through research. Solis combines production and research to effectively ensure the reliability and safety of the inverter.

·Third-party reliability assessment
PVEL, in the United States, is an authoritative organization engaged in third-party expert consultation and evaluation services in the oil, gas and energy industries. Solis is the first string inverter manufacturer in the world to obtain a third-party product reliability report from the global authority PVEL.
The technical reliability assessment is complete, and includes:

3. Production Management

Production process is critical to product reliability.
Solis has a complete automated production process, and intelligent detection of each production process to ensure production consistency. At the same time, each inverter will undergo performance testing and reliability testing to ensure product quality.

Solis has a complete automated production process, and intelligent detection of each production process to ensure production consistency. At the same time, each inverter will undergo performance testing and reliability testing to ensure product quality.

4. Conclusion

The inverter is one of the core components of the PV system, and its safe and reliable performance directly affects the normal operation of the system. Solis has always put product quality at the heart of the company. While continuously improving the performance of innovative dimensions such as product intelligence and digitalization, it has also always adhered to the original intention of stability and reliability. It has been effective in device selection, design, evaluation and production. This allows Solis to provide more safe, reliable, intelligent and efficient inverter products to every customer around the world.

About Ginlong Technologies:
Established in 2005, Ginlong Technologies (Stock Code: 300763.SZ) is one of the most experienced and largest manufacturers of solar inverters. Presented under the Solis brand, the company's portfolio uses innovative string inverter technology to deliver first-class reliability that has been validated under the most stringent international certifications. Armed with a global supply chain, world-class R&D and manufacturing capabilities, Ginlong optimizes its Solis inverters for each regional market, servicing and supporting its customers with its team of local experts. For more information on how cost-effective Solis delivers value while maximizing reliability for residential, commercial, and utility customers, go to ginlong.com.