PV Panel Purchase Guide: Avoid Pitfalls and Identify High-Quality PV Products from a PV Factory Perspective

With the popularization of photovoltaic (PV) technology, the installation of household and industrial-commercial PV systems has become increasingly common. As the core component of the entire PV system, the quality of PV panels directly determines power generation efficiency, service life, and long-term benefits. Many people are easily misled by the gimmicks of "low price" and "high power" when purchasing, often falling into traps. Today, from the perspective of PV factory production and testing, we will teach you to avoid purchase pitfalls in 3 minutes and accurately select high-quality PV panels.

As the source of PV panel production, factories control product quality throughout every link from raw materials to finished products leaving the factory. These links are precisely the "judgment criteria" that we most easily overlook when purchasing. Different from the promotional rhetoric of distributors, the purchase skills from a factory perspective are more authentic and practical, helping you avoid 90% of ineffective choices.

I. Precondition for Avoiding Pitfalls: Understand First – The "Core Quality Code" of PV Panels Lies in the Factory

Many people only look at the surface power parameters when purchasing PV panels, but they do not know that for PV panels with the same power, the actual power generation efficiency and service life can differ by double depending on the factory's production standards, raw material selection, and testing processes. The core control points of PV factories are the "bonus items" for us when purchasing, and also the key to avoiding low-price traps.

Simply put, the core requirements for high-quality PV panels are: up-to-standard raw materials, standardized production processes, and strict factory inspection. In contrast, most low-quality PV panels are produced by factories cutting corners in these three links to reduce costs. Although they seem cheap, their power generation attenuates quickly in the later stage, with high failure rates, which is actually more costly in the long run.

II. 4 Purchase Skills from a Factory Perspective to Avoid All Pitfalls

Skill 1: Check Raw Materials – Silicon Wafer Quality Determines the "Foundation" of PV Panels

The core of a PV panel is the silicon wafer, which is the foundation of PV panel power generation and the first checkpoint in factory production. From the production logic of PV factories, the purity, thickness, and cutting accuracy of silicon wafers directly affect the photoelectric conversion efficiency.

Pitfall Avoidance Tips: When purchasing, do not only listen to the classification of "monocrystalline silicon" and "polycrystalline silicon". Instead, ask about the purity of the silicon wafers (high-quality silicon wafers need to have a purity of more than 99.999%) and the manufacturer of the silicon wafers (prioritize leading silicon wafer enterprises such as Longi and GCL). To save costs, low-quality PV panels use silicon wafers with insufficient purity or even recycled silicon wafers, resulting in rapid attenuation of power generation efficiency in the later stage, which basically becomes obsolete in 3-5 years.

Factory Reminder: Regular PV factories will strictly screen silicon wafers, removing those with damage, insufficient purity, and large cutting deviations. In contrast, small workshop-style factories will directly use unqualified silicon wafers, which is the core trick of low-price PV panels.

Skill 2: Check Production Process – Packaging Process Determines the "Service Life" of PV Panels

The packaging process of PV panels is a core link in factory production, which directly determines the anti-aging and weather resistance of PV panels, and is also the key to distinguishing high-quality from low-quality products. PV panels are exposed outdoors for a long time, subject to wind, sun, rain, and snow erosion. If the packaging process is not up to standard, problems such as delamination, water ingress, and breakage are likely to occur.

Pitfall Avoidance Tips: When purchasing, focus on the packaging materials and packaging process of PV panels. High-quality PV panels use high-transmittance tempered glass (transmittance ≥ 90%) and aging-resistant EVA film (UV-resistant and yellowing-resistant), with no bubbles, no delamination, and neat edges during packaging. In contrast, low-quality PV panels use ordinary glass and inferior EVA film, which are prone to bubbles and rough edges during packaging. Delamination and water ingress will occur in 1-2 years, leading to short circuits and power generation failure.

Factory Reminder: Regular PV factories use automated packaging production lines with dust-free operation throughout. After packaging, strict weather resistance tests (high and low temperature tests, rain tests, UV tests) are conducted to ensure that PV panels can adapt to different outdoor environments, with a service life of 25-30 years. In contrast, small factories mostly use manual packaging with rough processes and no testing links, and the service life is usually less than 10 years.

Skill 3: Check Test Reports – Factory Inspection is the "Pass" for High-Quality PV Panels

Every high-quality PV panel must go through multiple tests in the PV factory before leaving the factory. Each qualified product will have a corresponding test report, which is the factory's commitment to product quality and the "hard evidence" for us when purchasing.

Pitfall Avoidance Tips: When purchasing, be sure to ask the merchant for the factory test report and third-party test report of the PV panels, focusing on 3 core indicators: photoelectric conversion efficiency, attenuation rate, and insulation performance. The photoelectric conversion efficiency of high-quality PV panels (conventional household models) should be ≥ 21%, the attenuation rate in the first year ≤ 2%, and the total attenuation rate in 25 years ≤ 20%; the insulation performance should be up to standard to avoid leakage risks during outdoor use.

Factory Reminder: Most low-quality PV panels do not have formal test reports or have falsified reports. Merchants will only emphasize "low price" and "high power" and avoid talking about test indicators. If the merchant cannot provide test reports, directly reject them – they are likely to be low-quality products produced by small workshops.

Skill 4: Avoid Low-Price Traps – Factory Costs Determine Prices, You Get What You Pay For

This is the most easily overlooked and common pitfall. Many people prioritize price comparison when purchasing, thinking that "the same power with a lower price is more cost-effective". However, they do not know that the production cost of PV panels is fixed. High-quality PV panels from regular factories have costs in raw materials, processes, and testing, so the price will not be too low.

Pitfall Avoidance Tips: The reasonable price of conventional power household PV panels is between 1.8-2.5 yuan per watt. If it is lower than 1.5 yuan per watt, it is likely to be a low-quality product. These low-price PV panels either use recycled silicon wafers and inferior packaging materials, or the factory omits testing links. In the later stage, they not only have low power generation efficiency but also may have potential safety hazards, which will increase long-term maintenance costs.

Factory Reminder: Regular PV factories will not engage in "low-price wars" because the costs of high-quality raw materials and standardized processes cannot be reduced. The profits of low-price PV panels come from cutting corners. Although they seem to save money, they actually lose long-term power generation and service life.

III. Factory Perspective Summary: Remember These 3 Sentences When Purchasing PV Panels

• 1. Do not covet low prices: PV panels lower than the reasonable market price are likely to have tricks – you get what you pay for;

• 2. Must check certificates: Test reports and brand qualifications are indispensable, which are the core proof of high-quality products;

• 3. Focus on details: Silicon wafer purity, packaging process, and attenuation rate are more important than simple power parameters.

PV panels are the "heart" of the PV system. Spend a little more time when purchasing, follow the above skills, and from the perspective of PV factory production, avoid low-price traps and choose high-quality products to ensure stable long-term power generation and benefits. After all, the service life of PV panels is as long as 25 years – choosing the right one once can save you worry for 25 years.