1. Current

Are there transparent modules from Apex?

Because of the issue of light leakage in the gaps between the solar cells in double-glass modules, Apex Solar generally uses glazed semi-tempered glass for the backside panel of the double-glass module, with a glazed layer formed into grids where the cells are placed. Because the requirement for accuracy and shading of the glazed layer on the back panel of the cell should be reduced, a certain amount of light leakage is allowed in the industry, without any effect on the quality and energy yield of the product. The inconsistency in light transmittance on the back panel of the single-glass module is caused by differences in light transmittance caused by variations in each model of the back panel of the module. However, when the quality of the back panel meets the certification criteria, there will be no effect on energy yield. Agents will preferentially load the same batch of modules and ship them to the downstream customers.

Does Apex Solar offer customized modules?

Customized module are available to meet the special demands of customers, and are in compliance with the relevant industrial standards and test conditions. During the sales process, our salespersons will inform customers of the basic information of the ordered modules, including mode of installation, conditions of use, and the difference between conventional and customized modules. Similarly, agents will also inform their downstream customers of the details about the customized modules.

Is there any difference between a black or silver module frame?

We offer black or silver frames of modules to meet customers’ requests and the application of the modules. We recommend attractive black-frame modules for rooftops and building curtain walls. Neither black nor silver frames affect the energy yield of the module.

How do you deal with fractures, scratches, hot spots, self-shattering and bubbles in certain parts of the modules?

Various abnormal conditions may be found throughout the life cycle of modules, including those arising from manufacture, transportation, installation, O&M and use. However, such abnormal conditions can be controlled effectively as long as Grade A products of LERRI are purchased from official suppliers and products are installed, operated and maintained according to the instructions provided by LERRI, so that any adverse effect on the reliability and energy yield of PV power plant can be prevented.

How are the energy yield and installed capacity of modules calculated?

The energy yield of module depends on three factors: solar radiation (H–peak hours), module nameplate power rating (watts) and system efficiency of system (Pr) (generally taken at about 80%), where the overall energy yield is the product of these three factors; energy yield = H x W x Pr. The installed capacity is caculated by multiplying the nameplate power rating of a single module by the total number of modules in the system. For example, for 10 285 W modules installed, the installed capacity is 285 x 10 = 2,850 W.

How much energy yield improvement can be achieved by bifacial PV modules?

Energy yield improvement achieved by bifacial PV modules compared to conventional modules depends on ground reflectance, or albedo; the height and azimuth of the tracker or other racking installed; and the ratio of direct light to scattered light in the region (blue or gray days). Given these factors, the amount of improvement should be assessed based on the actual conditions of the PV power plant. Bifacial energy yield improvements range from 5–20%.

What documents should be provided to customers on procurement of modules?

Any distributed modules marketed by us will be accompanied by certificates of conformity, inspection reports and shipping marks. Please ask truck drivers to provide certificates of conformity if no such certificates are found in the packing case. The downstream customers, who have not been provided with such documents, should contact their distribution partners.

How do you check the date of manufacture of the module?

Scan the barcode on the module to check the date of manufacture of the module (MM/DD beginning from the 10th digit).

Can the quality of modules be guaranteed under extreme weather conditions?

Apex modules have been rigorously tested and are able to withstand typhoon wind speeds up to Grade 12. The modules also have a waterproof grade of IP68, and can effectively withstand hail of at least 25 mm in size.

How long is the warranty period of APEX modules? How many years can efficient power generation be guaranteed?

APEX modules have a general warranty of 12 years. Monofacial modules have a 25-year warranty for efficient power generation, while bifacial module performance is guaranteed for 30 years.

What is the difference between APEX and other module suppliers in residential projects?

APEX, as the world’s leading solar module technology company, has been deeply involved in the residential market for many years and has a strong solutions team. APEX can provide customers with professional project survey, system design, financial advice, power plant construction and acceptance standards, and power plant monitoring operation and maintenance services for the entire life cycle of the project.

What are the advantages of APEX bifacial modules?

APEX took the lead in working with domestic and foreign institutions and customers to carry out empirical testing of bifacial modules for PV power plants, systematically studying the power generation mechanisms of bifacial modules. APEX also leads the industry in bifacial module shipments, surpassing 20 GW+, while providing customers with reference data and technical support.

How does APEX ensure module product quality?

APEX’s intelligent production network can guarantee the traceability of each module, and our highly automated production lines feature end-to-end inspection and analysis processes to ensure that each module meets the highest quality standards. We select module materials according to the highest standards, with the requirement that all new materials be subject to extended qualification and reliability tests before being incorporated into our products. Third-party labs like RETC and PVEL have ranked our modules among the highest quality products on the market.

How does APEX guarantee module supply?

APEX has the largest module production capacity in the industry, with more than 50 GW in its integrated capacity network, fully guaranteeing the supply of modules. In addition, the production network facilitates the global distribution of modules with the help of land transportation, railway transportation and sea transportation.

What type of module is better for my application, monofacial or bifacial?

Bifacial modules are slightly more expensive than monofacial modules, but can generate more power under the right conditions. When the rear side of the module is not blocked, the light received by the rear side of the bifacial module can significantly improve energy yield. In addition, the glass-glass encapsulation structure of the bifacial module has better resistance to environmental erosion by water vapor, salt-air fog, etc. Monofacial modules are more suitable for installations in mountainous regions and distributed generation rooftop applications.

What are the reasons why fluctuation occurs in current and voltage of PV power plants? Will this kind of fluctuation affect the energy yield of the plant?

The current and voltage of PV power plants are affected by temperature, light and other conditions. There are always fluctuations in voltage and current since variations in temperature and light are constant: the higher the temperature is, the lower the voltage is and the higher the current is, and the higher the intensity of light is, the higher the voltage and current are. The modules can operate across a temperature range of -40°C–85°C so the energy yield of the PV power plant will note be affected.

Will the efficiency of PV power generation be influenced by differences in color?

Modules appear blue on the whole because of an anti-reflective film coating on the surfaces of the cells. However, there are certain differences in the color of the modules due to a certain difference in thickness of such films. We have a set of different standard colors, including shallow blue, light blue, medium blue, dark blue and deep blue for modules. Furthermore, the efficiency of PV power generation is associated with the power of modules, and is not influenced by any differences in color.

How can energy yield be increased while keeping the PV power plant clean?

To keep the plant energy yield optimized, check the cleanliness of the module surfaces monthly and regularly wash them with clean water. Attention should be paid to fully cleaning the surfaces of modules to prevent formation of hotspots on modules caused by residual dirt and soiling, and the cleaning work should be carried out in the morning or at night. Also, don’t allow any vegetation, trees and structures that are taller than the modules on the eastern, southeastern, southern, southwestern and western sides of the array. Timely pruning of any trees and vegetation taller than the modules is recommended to prevent shading and possible impact on the energy yield of the modules (for details, refer to cleaning manual).

What are some of the reasons why energy yield can be much lower on some systems than others?

The energy yield of a PV power plant depends on many things, including the site weather conditions and all the various components in the system. Under normal service conditions, the energy yield depends mainly on the solar radiation and conditions of installation, which are subject to a greater difference between regions and seasons. In addition, we recommend paying more attention to calculating the annual energy yield of the system rather than focusing on daily yield data.

Mountain = Hillside? Big slope = Complicated?

The so-called complex mountain site features staggered gullies, multiple transitions toward slopes, and complex geological and hydrological conditions. At the beginning of design, the design team must fully consider any possible changes in topography. If not, modules could be obscured from direct sunlight, leading to possible issues during layout and construction.

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