Solar PV panels normally have great warranties. Below is one of the best form SunPower.
Most are 25 years. If it's a new low cost brand be sure to check the warranty. If they are new or out of the country will they be able to stand behind the written warranty ? Is the price to low to believe ? Be sure to check all the facts.
SUNPOWER LIMITED WARRANTY FOR PV MODULES
SPR-315E-xxx-x, SPR-300E-xxx-x, SPR-305-xxx-x, SPR-290-xxx-x, SPR-230-xxx-x, SPR-225-xxx-x, SPR-220-xxx-x, SPR-217-xxx-x, SPR-215-xxx-x, SPR-210-xxx-x, SPR-205-xxx-x, SPR-200-xxx-x, SPR-90-xxx-x ("xxx-x" define product variants)
1. Limited Product Warranty – Ten (10) Year Repair, Replacement or Refund Remedy
SunPower Corporation with offices at 3939 North First Street, San Jose, CA 95134 ("SunPower") warrants that for ten (10) years from the date of delivery, its Photovoltaic modules ("PV modules") shall be free from defects in materials and workmanship under normal application, installation, use and service conditions. If the PV modules fail to conform to this warranty, then for a period ending ten (10) years from date of delivery to the original end-customer ("the Customer"), SunPower will, at its option, either repair or replace the product, or refund the purchase price as paid by the Customer ("Purchase Price"). The repair, replacement or refund remedy shall be the sole and exclusive remedy provided under the Limited Product Warranty and shall not extend beyond the ten (10) year period set forth herein. This Limited Product Warranty does not warrant a specific power output, which shall be exclusively covered under clause 2 hereinafter (Limited Power Warranty).
2. Limited Power Warranty
SunPower additionally warrants: If, within twelve (12) years from date of delivery to the Customer any PV module(s) exhibits a power output less than 90% of the Minimum Peak Power1 as specified at the date of delivery in SunPower's Product datasheet, provided that such loss in power is determined by SunPower (at its sole and absolute discretion) to be due to defects in material or workmanship SunPower will replace such loss in power by either providing to the Customer additional PV modules to make up such loss in power or by providing monetary compensation equivalent to the cost of additional PV modules required to make up such loss in power or by repairing or replacing the defective PV modules, at the option of SunPower
3. Exclusions and limitations
a) Warranty claims must in any event be filed within the applicable Warranty period. b) Warranty claims may only be made by, or on the behalf of, the original end customer or a person to whom title has been transferred for the PV Modules. c) The Limited Warranties do not apply to any of the following: 1. PV modules which in SunPower's absolute judgment have been subjected to: misuse, abuse, neglect or accident; alteration, improper installation, application or removal (including but not
1"Minimum Peak Power" = Peak power minus the Peak power tolerance (as specified in SunPower’s Product datasheet). "Peak power" is the power in peak watts that a PV module generates at STC (Standard Test conditions: Irradiance of 1000 W/m2, light spectrum AM 1.5g and 25C_________________________________________________________________________________________ SunPower Corporation 1.877.SUN.0123 ● Email : customercare@SunPowercorp.com