Solis Inverters

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Background In some photovoltaic power plant projects, ordinary cables have been used in replacement of dedicated photovoltaic cables, which can provide lower installation costs. This approach puts the entire solar PV system at risk and is dangerous. In this Solis seminar we introduce the differences between photovoltaic cables and ordinary cables, and the importance of correct cable selection.

The Difference Between Photovoltaic and Ordinary Cables 1.Structural Differences The proportion of investment in solar projects globally is increasing faster than ever before and the focus on LCOE and return on investment remains under the spotlight for any project. In some instances in order to save costs, contractors specify ordinary pvc cables instead of dedicated solar PV cables. Doing this may save costs initially but it will greatly affect the life of the system. The characteristics of photovoltaic cables are determined by the special insulating materials and sheathing materials for cables - cross-linked PE. After being irradiated by an irradiation accelerator, the molecular structure of the cable material changes and provides specific performance in high temperatures. As well as performance at high temperatures these cables provide resistance to cold, oil, acid/alkali and will overall provide long service life for the solar system. Photovoltaic cable: Conductor: Tinned copper Insulation: Irradiated cross-linked polyolefin Sheath: Irradiation cross-linked polyolefin Ordinary cable: Conductor: copper Insulation: PVC or XLPE Sheath: PVC

The conductors used in ordinary cables are the same as those used in photovoltaic cables. Photovoltaic cables have higher insulation and jacket specifications and can be used in harsher environments. 2. Temperature and Voltage Resistance Characteristics In solar power plants, photovoltaic cables are constantly exposed to harsh environmental conditions, such as high temperatures and UV radiation. In places with good lighting conditions, the on-site temperature of the solar system can be as high as 100°C on sunny days. This brings high ultraviolet radiation and ordinary cables cannot withstand such an environment for a sustained periods of time. Ordinary cables cannot withstand such high DC voltage for a long time, and photovoltaic cables are required.

Technical Specifications Photovoltaic cables Ordinary cables

Operating voltage 1.0kVDC,1.5kVDC 450V,750V

Ambient temperature ranges -40°C to +90°C -15°C to +70°C

Short circuit temperature 250°C ≤180°C 3.Photovoltaic Cables Deliver Better Contact The majority of problems in photovoltaic systems come from incorrect cable selection and improper crimping techniques. These are generally the root cause of fires in photovoltaic systems and for this reason cable selection needs proper attention.

Source: Results of FMEA-Analysis ”PV-Brandschutz” Project Fraunhofer ISE&TÜV A core element of photovoltaic system design is the matching between cables and DC connectors. Correct matching ensures crimping is more accurate which in turn delivers better contact between cables and DC plugs. Oxidation caused by inaccurate crimping leads to increased contact resistance, causing fire. Copper conductors of ordinary cable wiring varies widely and has poor compatibility with DC connectors. It is inevitable that oxidation will occur after long-term wear, resulting in an increase in contact resistance.

Summary In photovoltaic systems, most of the problems come from the DC side, and more than 90% of these problems come from incorrect cable selection and crimping problems. For long lasting, trouble-free system operation spending time and attention on compatible, high-quality PV cable at the design stage is vital. RM

Solis Undertakes Customer Satisfaction Survey to Improve its Products and Service

June 17th, 2022. Ginlong Technologies (Solis) today launches its half year customer satisfaction survey to find out ways in which it can improve its products and services and better meet the needs of its customers around the world. “Ensuring we are meeting the needs of customers in all our markets with products and services that match those needs has always been a focus for Solis.” Says Eric Zhang, International Sales Director for Solis. “It is important to hear from distributors, installers and other industry stakeholders to understand how we can improve.” The company wants everyone to have their say inviting users of both Solis and other products and services within the solar PV industry to respond. The company will use the results of the survey to look at processes and product development areas that could be improved for a better customer experience. To take part you are encouraged to click on the link “Solis Customer Satisfaction Survey” which can be found on the website www.solisinverters.com and on Solis social media channels. The survey will take no more than 5 minutes to complete and is live from today Thursday June 17th and closes on July 6th . Anyone who completes the survey and provides their email address will be entered into a draw with a chance to win a $200 Amazon Gift Card. Winners will be chosen per continent (Europe, Africa, Asia, North America, South America etc.) and notified by email after the survey has closed and no later than July 15th. RM

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SolIS TakeS No. 3 PoSITIoN IN Global INverTer raNkINGS

International authoritative research institution IHS Markit (part of S&P Global) announces the top 10 global solar inverter shipments for 2021 withGinlong (Solis) taking the No.3 position. According to the research, Solis not only leads the distributed inverter shipments in relevant regions around the world, but also for the first time ranks top 10 in the global shipments of utility power stations. According to TF Securities, in the bidding of utility power stations of central/state-owned enterprises in China,string inverters accounted for as much as 81% in 2021. Globally, string inverters accounted for more than 70% of utility scale projects - 10% higher than 2020. The share of string inverters for utility scale projects globally has been as high as 80%-90% in Poland, Germany, Vietnam, Thailand and many more. String inverter technology has gradually narrowed the cost gap to centralized inverters, accelerating the penetration into the utility power station sector. Other factors such as its wider MPPT working voltage range, simpler maintenance, large-scale power of a single inverter etc. have also helped drive this growth. Ginlong (Solis) was the first publicly owned and stock listed company with a primary focus on solar string inverters. During 2021, facing multiple challenges such as the spread of COVID-19, increasing supply chain costs and the shortage of IGBT's, the company maintained rapid development. Operating revenue in 2021 reached 512.90 million USD, up 58.92% YoY and net profit increased to 73.36 million USD. Q1 2022 sees growth of 48.96% v's the same period the previous year with sales exceeding 173 billion USD, a new record high! The move towards carbon neutrality is being super charged by the unprecedented increase in global energy prices. 2022 is showing a continued upward trend in the demand for solar PV especially in the European market, where the forecasted installed capacity is constantly revised up. The compound growth rate of installed capacity in Europe is expected to increase by more than 40% from 2022 to 2025. The energy storage market is also gradually maturing, costs continue to decline and the growth of storage across all major sectors is beginning to show. Solis has increased its own manufacturing capacity to easily adapt to this growth and the shift towards energy storage products. The newly built automated and highly digitalized factory has a capacity of 40GW+. Solis is committed to a global vision built on product-centered engineering, developing the global strategic pathway of "Ginlong" and "Solis" independent brands. As markets develop there will always be a focus on strengthening the localized sales network, technical support and after-sales service. The company's mission of "Developing technology to power the world with clean energy" underpins this. RM