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Longi solar panel warranty

Limited Warranty for LONGi Solar Modules

LONGi Green Energy Technology Co., Ltd. and its direct owned or indirect owned subsidiaries are committed to the following quality performance warranty for solar modules (hereinafter referred to as “modules”). The Product Warranty Term starts as of the sales date (modules is directly installed, but is not resold otherwise) or 6 months after the modules are shipped out of the production plant, which the earlier date shall be effective (hereinafter short as the “Warranty Effective Date”).

1. Limited Product Warranty-Repair or Replacement within 10 years

LONGi Green Energy Technology Co., Ltd. assures that under the conditions for regular application, installation, use and service, the integral module (including attached DC connectors, cables) can meet the demand of regular application, use and installation and have no defect caused by material and process within 120 months as of the Warranty Effective Date. If the modules get out of order or fail to operate due to material or process defects within 120 months as of the Warranty Effective Date, LONGi Solar provides remedy, only repairing and replacing the failed modules after verification and confirmation by an independent testing institution agreed by LONGi Solar and the customer in advance. The remedy of repair or replacement is the exclusive measure within this “Limited Product Warranty”, which does not involve assurance for the module power output. The power output assurance is to be specially elaborated in the Section 2 “Limited Warranty for Peak Power” below.

2. Limited Warranty for Peak Power – Limited Compensation

LONGi Solar provides power output loss assurance within 25 years as of the Warranty Effective Date. Power output loss is calculated by comparing the minimum “module nominal power under standard testing conditions” (short as nominal power) marked on the nameplate with the actual power output under standard testing conditions.

The annual attenuation is less than 3% within the 1st year from the Warranty Effective Date and is less than 0.55% from the 2nd year to the 25th year within the peak power warranty period. The output power can reach 83.8% in the last year of the 25-year peak power warranty period.

LONGi Solar assures that any qualified module sold out can meet the power guarantee value mentioned above within 25 years of power warranty period from the Warranty Effective Date. If any power loss exceeds the guaranteed value verified by LONGi Solar, and LONGi Solar attributes such power loss to its material or process defects, or such power loss is further (required by customers) verified by the third party testing institution (agreed by both the customer and LONGi Solar), LONGi Solar will make judgment at its discretion and take either remedial measures as (1) provide extra modules to make up for power loss as above; or (2) repair or replace the defected modules and provide the shipment free of charge to the initial delivery location.

The above-mentioned compensations in “Limited Warranty for Peak Power” are the sole and exclusive remedy measures.

Note: If any customer finds that the defective modules need to be returned before the treatment, the freight shall be borne on the customer. If the third party testing institution confirms that it is the responsibility within the scope of LONGi Solar quality warranty, the shipping cost can be compensated as per the freight or related invoice provided by the customer.

3. Exceptions and Restrictions

(a) All quality warranty claims shall be submitted to LONGi Solar or LONGi Solar authorized distributors in written form within but not beyond the warranty period in any cases.

(b) “Limited Product Warranty” and “ Limited Warranty for Peak Power” do not apply to modules in situations below:

  • Improper use, misuse, negligence, intentional damage or accidents;
  • Fabrication without permission, improper installation or application;
  • Fail to follow the repair and recovery instructed by the producer;
  • Fail to follow the LONGi Solar maintenance instructions;
  • Power failure, power surge, lightning, fire and flood, accidental damage or force majeure.


(c) “Limited Product Warranty” and “Limited Warranty for Peak Power” do not compensate costs as, any costs related to module installation, demounting and re-installation (except for those stated in the last part of Section 5) or custom clearance costs and other costs related to return of modules.
(d) Claims will be rejected if the module model and serial number labels are falsified, removed or blurred without written authorization by LONGi Solar

4. Quality Warranty Scope

Unless LONGi Solar agrees on and signs and recognizes other obligations and liabilities in written form, the warranty clauses in this quality warranty will replace and exclude other explicit or implied assurances including but not limited to the merchantability assurance, or assurance for special purposes or applications, and other obligations and liabilities undertaken by LONGi Solar. LONGi Solar shall not be responsible for human injury or property losses nor for other losses or injuries caused by modules or module-related problems (including but not limited to any module defect or any defect caused by use and installation). LONGi Solar shall not compensate any collateral damages, derived damages or special damages by any cause. Losses such as profit loss, production loss or revenue loss caused by product faults are excluded hereby. If LONGi Solar makes compensation for customers, the accumulated compensation amount shall not exceed the invoicing price for a single module paid by the customer.

5. Quality Warranty Performance

If any customer proposes legitimate quality warranty requirements in accordance with the “Limited Product Warranty”, they shall send a written notice by registered letter to LONGi Solar at the address below or send email to LONGi Solar email address. The customer shall attach proof of quality warranty herewith, corresponding module serial number and purchasing date and provide the invoice marked with clear purchasing date, price, module model and LONGi Solar seal or signature.

If modules need to be shipped to LONGi Solar for testing, repair or replacement, LONGi Solar shall provide the return merchandise authorization (RMA) to the customer. LONGi Solar will not accept returned modules without RMA. With approval of the customer service department, the reasonable, normal and proved shipping cost (including return cost and re-shipping cost of repaired and replaced modules) of modules related to “Limited Product Warranty” and “Limited Warranty for Peak Power” will be compensated by LONGi Solar to customers.

6. Transferability

The clauses of this “Quality Warranty” will cover end users and can be transferred to any successive owners if the module’s installation position is unchanged and the inheritance or transferring relations can be sufficiently proved.

7. Severability of Clauses

Should a part or a clause of the “Quality Warranty” is considered invalid or 5 of 6 ineffective or not executable, or this part or clause to some people or some conditions is deemed invalid or ineffective or not executable, this situation shall not affect effectiveness of other parts or clauses of the “Quality Warranty”. In this case, the other parts or clauses in this “Quality Warranty” or the applicability of this “Quality Warranty” are considered independently effective.

8. Dispute Resolution

If any dispute occurs with quality warranty claims, one of the domestic first-class testing institutions such as TÜV SUD, Intertek, UL, CQC and CGC shall be invited for verdict of the final claim. All the cost shall be borne by the losing party unless otherwise stipulated in the verdict. LONGi Solar reserves the right for the final interpretation. Further dispute resolutions shall be executed by the applicable legal jurisdiction agreed upon in the sales contract signed by both parties.

9. Alteration

The repair, replacement or the provision of extra modules does not mean that the warranty period is renewed and the original warranty period shall not extend. Any replaced modules are possessed by LONGi Solar and shall be treated or disposed of at its own discretion. In case LONGi Solar has stopped producing the same model as the defective modules which the claim is made against, LONGi Solar shall keep the right to provide the modules of other models (different sizes, color, shape or power), either new brand or original brand.

10. Force Majeure

If LONGi Solar fails to perform or postpone performing sales articles or this “Quality Warranty” in the event of fire, flood, storm, typhoon, lightning, natural disaster, change of public policies, terrorism, war, riot, strike, or unavailability of proper and sufficient labor and materials or due to any other reasons or situations out of control of LONGi Solar, LONGi Solar shall not take any responsibilities for customers or any third party. In this case, LONGi Solar shall not take any responsibilities for end users or any third party in any form.
Note: “Peak power” is the maximum power of solar module under the standard testing conditions (STC). Standard testing conditions refer to as:
(a) Spectrum amplitude AM1.5
(b) 1000W/m2 irradiance
(c) Irradiance at the correct angle and the cell temperature is 25℃. Testing is done at the terminal of the junction box according to IEC61215 (equivalent to GB/T 9535). LONGi Solar’s calibration and testing standard are effective on the manufacturing date of the solar modules. LONGi Solar’s calibration standards are consistent with the approved standards by international institutions.

The 25-year performance Product Warranty Term is made according to Technical Standards for Crystalline Silicon Terrestrial Photovoltaic (PV) Modules edited by the Technical Research Department.

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