LONGi Solar Panel

LONGi solar panels are made in China, Vietnam and Malaysia

LONGi has 7 main manufacturing plants in China: Yunnan, Ningxia, Jiangsu, Shaanxi, Zhejiang, Anhui, and Shanxi. Yunnan and Ningxia are the largest. LONGi also has facilities in Vietnam and Malaysia.

In 2018,then President Trump imposed a 30% duty on all imported solar cells and modules, in an attempt to protect and encourage US manufacture of PV products.

In February 2022, Section 201 tariffs on crystalline silicon modules and cells were extended until 2026 at 14.75%.

Then in April 2022, after a petition from Auxin Solar, The Department of Commerce initiated an investigation into whether Chinese companies were circumventing antidumping and countervailing duties by manufacturing cells and modules in Southeast Asian countries.

23.6 GW of PV modules and 2.6 GW of PV cells were imported into the United States in 2021, 77% of which came from Malaysia, Vietnam, Thailand, and Cambodia.

The Biden Administration’s decision, however, to exempt all Bifacial solar panels from the tariff, as well as doubling President Trump’sfirst 2.5 GW tariff-free import quota to a whopping first 5 GW of imported cells was seen as a compromise between US manufactures and US solar consumers.

LONGi’s stringent MES (Manufacturing Execution System) controls quality in its new product development, production, supply chain and testing has earned ISO 9001 and IEC TS 62941 certifications in the photovoltaic field.

Longi has a unique approach to optimizing the quality of their panels. By using exact product specifications across multiple product lines, LONGi has a much simplified procurement process in sourcing of material, manufacturing and supply management., product production, and inventory management.

Being vertically integrated and adopting high-quality, low-degradation silicon wafers, fueled by high level, in-house cell supply allows LONGi to deliver a top-quality solar module well suited to Texas weather extremes.

Currently, the Hi-MO4 series and bifacial modules are based on M6 silicon wafers.

LONGi solar panels by the numbers

LONGi solar offers a variety of solar panels well suited for completely off grid systems, as well as more common grid-tied systems.

In commonly used Boron doped silicon, trace amounts of oxygen are leftover during the solar panel manufacturing process. When this type of silicon is used in the manufacture of solar panels, this remaining oxygen can result in a 2% - 3 % loss of power early in the panel's life. This phenomenon is known as Light Induced Degradation or LID. Depending on the quality of the silicon used, panels made with Boron doped silicon can expect a continued decrease of power at a rate of .5% to .8% annually.

In early 2020 LONGi Solar, in partnership with Shin-Etsu Chemical Co, developed a new gallium-doped silicon cell which appears to dramatically reduce light induced degradation (LID) in common P-type PERC silicon.

Since adopting Gallium doped silicon in the manufacturing process, Longi has extended the warranty of their panels.

Lower quality Boron-doped, P-type silicon wafers are used by the majority of solar panel manufacturers, retaining an average around 82% after 25 years of service.

In utilizing Gallium-doped silicon, LONGi has reduced the effects of LID effects during the first year to 2%, with less than a 0.5% reduction annually during the remaining service life of the panel. LONGi Gallium-doped panels will retain nearly 85% of the original production power rating after 30 years.

Smart Soldering Technology

Multi bus bar or MBB technology is commonly used in the industry to increase efficiency by reducing the space between silicon cells to increase surface area

As an innovator in the industry, LONGi Solar developed a unique triangular shaped micro bus bar with flattened ends. Increased efficiency is achieved by reducing inter cell gap.

Summary - LONGi Solar Panels

LONGi Solar has emerged as the world's largest solar manufacturer and more recently one of the leading developers of innovative solar cell technologies.

With a massive global production capacity, LONGi is driving down costs of efficient silicon wafers while simultaneously producing cost-effective solar panels for residential applications.

LONGi Solar panels have been a reliable solar panel option for many Texas homeowners seeking the latest technology and long-term performance in an affordable solar panel.

Record-breaking achievements, Gallium-doped silicon and smart soldering have secured LONGi’s position as a top solar technology innovator.

LONGi's Gallium-doping when compared to traditional Boron-doping mitigates the effects of Light-Induced Degradation (LID) in P-Type silicon modules.

LONGi Solar Panels Efficiency

LONGi’s LR4-60Hl3l3 345~365M solar module’s efficiency ratings range between 18.5% and 19.5% putting them on the higher end of average solar panel efficiency. The Hi-MO 4 series has proprietary Smart Soldering Technology with improved 9-wire bus bar for enhanced electron flow.

LONGi Solar Panels Power Tolerance Rating

Power tolerance refers to the amount of electricity it will produce either above or below its rated power capacity at Standard Test Conditions (STC). The smaller the power tolerance deviation or range, the more accurate the rated power capacity is.

LONGi Hi-MO 4 solar modules have a power tolerance of -0/+5W.

This means LONGi Solar panels will, at the very minimum, be operating at their rated capacity, However, these panels have exceeded, by as much as 5 watts above its rated capacity.
For example, a LONGi Solar panel rated at 360 W will be able to operate anywhere from 360 W to 365 W (or 5 watts higher than 360) under STC.

With a -0% tolerance rating, the LONGi LR4-60HPH 360 M panel operates at, or above 360 W. These performance scores, coupled with LONGi’s high PVEL scores, equate to real world value.

LONGi Solar Panels Temperature Coefficient

Solar panels perform best at 77°F (25°C). Here in Texas, obviously, we see temperatures that far exceed 77°F for long portions of the year. A solar panel’s temperature coefficient is a measurement indicating how well a specific model of solar panel will perform outside of ideal operating conditions.

Knowing a panel’s temperature coefficient and the temperature of the panel will allow you to predict your panel’s performance during the dog days of summer.

Temperature coefficients are calculated in Celsius.

With each degree above 25° C /77° F, a given solar panel’s electric output will be diminished by its temperature coefficient.

Using the above methodology, the LONGi LR4-60HPH 360 panel has a temperature coefficient of -0.37%/°C. Hence, when this panel’s temperature increases by one degree, from 25°C to 26°C (77° F to 79° F), expect a 0.37% reduction in potential electric output.

When it's July in Texas and temperatures have climbed to 95° F/35° C, expect electric output to decrease by 3.7%. When the hottest hour of the summer drives the mercury into the triple digits, say 113° F/ 45° C, the LONGi LR4-60HPH 360 will decrease approximately 7.4%.

LONGi Performance Factors

LONGi Won the prestigious Renewable Energy Test Center "High Achiever" Award for PV Modules for the Fourth Consecutive Year in 2022.

LONGi modules have undergone rigorous laboratory and real-world testing by independent, third-party testing organizations. . LONGi panels earned top awards in RETC’s PV Module Index Report and are rated to withstand hurricane-force winds and extreme Texas weather conditions such as hail and snow.

The RETC released its 2022 PV Module Index (PVMI) Report rating the RETC its High Achiever Award for outstanding module performance for the fourth consecutive year *2019, 2020, 2021, 2022

A vast majority of the planet's solar capacity has been operational for less than 60 months. Accordingly, actual long-term data is not yet available in such a young industry. In this absence of real-world data, the solar industry relies on evaluations from expert third party testing labs.

PV Evolution Labs Scorecards summarize results from our independent testing and name specific PV modules as Top Performers

PVEL’s independent lab and field-testing assembles data that developers use to get reliable solar equipment, allowing performance forecasting with a strong degree of accuracy.

In the 9th Edition of PVEL’s PV Module Reliability testing (2022) LONGi made the 6X Top Performer after being awarded the distinction in 2017, 2018, 2019, 2020, 2021 and 2022.