Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 20,053
(Or so says this year's report.)
"In-depth studies of 36 solar projects in India show that modules with less than five years of field operation have higher average degradation rates than older modules, especially in hot climates."
"The findings may undermine the financial viability of 40-year modeled lifetimes for modern solar power plants that assume aggressive annual degradation rates, particularly if rigorous due diligence that includes BOM specification is not conducted."
(Later says same model panel can have a variety of BOM components, so one may be more reliable than another of the same model.)
PID, Potential Induced Degradation, is shown as a leading cause. This effect is influenced by P-type vs. N-type silicon, positive grounded vs. negative grounded vs. non-grounded array (transformerless grid-tie inverters have half the PV panels biased above ground and half below, so some are protected against PID and some are subject to it.) It appears to me that if we are able to configure our system with the preferred positive vs. negative grounding for the type of silicon used in our panels (or select preferred type of panel for our system's grounding), we can prevent PID. But most transformerless inverters don't allow that.
After you click through the pages describing accelerated tests, last one lists "Top Performer" brands/models for 2021. They never disclose the $#!& list, but graphs show how badly some performed.
The following link provides download of reports for previous years:
"In-depth studies of 36 solar projects in India show that modules with less than five years of field operation have higher average degradation rates than older modules, especially in hot climates."
"The findings may undermine the financial viability of 40-year modeled lifetimes for modern solar power plants that assume aggressive annual degradation rates, particularly if rigorous due diligence that includes BOM specification is not conducted."
(Later says same model panel can have a variety of BOM components, so one may be more reliable than another of the same model.)
PID, Potential Induced Degradation, is shown as a leading cause. This effect is influenced by P-type vs. N-type silicon, positive grounded vs. negative grounded vs. non-grounded array (transformerless grid-tie inverters have half the PV panels biased above ground and half below, so some are protected against PID and some are subject to it.) It appears to me that if we are able to configure our system with the preferred positive vs. negative grounding for the type of silicon used in our panels (or select preferred type of panel for our system's grounding), we can prevent PID. But most transformerless inverters don't allow that.
After you click through the pages describing accelerated tests, last one lists "Top Performer" brands/models for 2021. They never disclose the $#!& list, but graphs show how badly some performed.
PVEL PV Module Reliability Scorecard
The 9th Edition of PVEL's PV Module Reliability Scorecard recognizes manufacturers with excellent test results in the PV Module Product Qualification Program.
modulescorecard.pvel.com
The following link provides download of reports for previous years:
Is there a reliable resource to compare panel makes/models
Well that sounds like a heck of a deal! Glad you placed your order and can't wait to see how it all works. That is a very good price, and I should not be surprised but that confirms they get a great deal when they upgrade. I wonder if they went with Trina on the replacement units? Any idea?
diysolarforum.com