Not All Tier-1 Solar Panels Are Equal - Energy Matters

(Img Source:polycrystalline solar panels)
Not only are solar panels not created equal generally; major differences in quality can be found even among 'Tier-1′ modules.     A Tier-1 classification is considered top shelf. Makers of Tier-1 panels are vertically integrated, invest heavily in research and development, use advanced robotic processes and have been manufacturing panels for more than 5 years.      The Tier-1 space is getting rather crowded, with various manufacturers claiming the distinction. It's reached a point that even within the class, there are wildly varying levels of quality and it seems the term "Tier-1″ shouldn't be fully relied upon in making a solar purchase decision.    

An independent third-party study was recently carried out by the Solar Energy Research Institute of Singapore (SERIS) into the effects of LID (Light Induced Degradation) and PID (Potential Induced Degradation)  on  REC solar panels vs a handful of Tier-1 competitors.    

REC says the study shows REC modules were less affected by LID than leading (unnamed) Chinese panels tested and REC solar panels experienced little or no degradation due to PID.      

In the Light Induced Degradation (LID) test, the 2 REC panels lost 4.45 watts and 4.6 watts. Panels from 5 other manufacturers experienced losses of between 5.1 watts and 12.25 watts. The test was run over 12 days on open circuit modules subjected to radiation levels of 40 kWh/m2.    

There was an even greater difference in the PID test.    

The Potential Induced Degradation (PID) test conditions; designed to damage panels, occurred over 96 hours at a temperature of 60C and humidity of 85%, with a voltage bias of 1000V. The glass surface was left uncovered.    

At the end of the test, the REC panel experienced no loss. Of the 4 other Tier-1 panels, one experienced zero degradation, another lost 13 watts capacity, the third lost 113.45 watts and the fourth; a whopping 124 watts - 51% of its nameplate capacity states REC.    

A summary of the test results can be viewed here (PDF).     Related:    Solar Power Consumer Guide Not All Solar Panels Are Equal Not All Solar Inverters Are Equal Tips For Choosing The Best Solar Panels