Which are the best solar panels in the market?
The ultimate goal of this comparison is to put some light on the difficult decision that our customers may have when choosing the most suitable photovoltaic solar panel for your needs. When you are choosing a solar panel, you need to consider several aspects such as quality, warranty, product origin, type of technology, efficiency, etc..
To illustrate the above, we have relied on the PV + Test conducted by the German TÜV Rheinland certification.
What are the best solar panels brands and the scores?
Some of the 11 brands that have authorized the publication of the results of the PV + Test are: SolarWorld, SHARP, Solon, Schott, Conergy, Sovello ...
The result of the test, in order of highest quality are:
|PV+Test: Best Solar Panels List|
|Date of Test:||Points||Quality||Brand||Panel Checked|
|Oct 2011||94.3||Very Good||Solon||Solon Blue 230/07-235|
|April 2013||92.29||Very Good||SolarWorld||SW 260 Poly|
|Feb 2011||91.3||Very Good (-)||Schott||Schott Poly 290|
|Feb 2011||90.7||Very Good (-)||SHARP||NU-180E1|
|Marchr 2012||89.8||Good (+)||IBC||IBC Monosol 240 ET|
|Feb 2011||89.0||Good (+)||Mitsubishi Electric||PV-TD185MF5|
|April 2012||88.5||Good (+)||Jetion||JT235PCe|
|Feb 2011||88.1||Good (+)||Conergy||PowerPlus 225P|
|Feb 2011||80.0||Good (-)||Perfect Solar||PS230-6P-TOP|
The degrees of PV + Test score ranging from the highest level, which is Very Good, to the Very Poor. In each grade, depending on results, may lead (+) or (-) as intermediate grade classification.
No doubt the PV + Test, should be a point to keep in mind when defining the photovoltaic module to use.
You can view these and other data on the website of TÜV, PV-Magazine or www.pvtest.de.
How can we check the difference in a real case?
Always the best way to check what is better and what is worst, is to see data about a real case. So, below we show you the performance data about a solar PV plant, in Greece, at same location, one project beside the other:
Project 1 With SolarWorld panel:
Solar Panel: SolarWorld SW235poly
Mounting structure: Fixed at 30
Shading: Partly in winter time
Total capacity: 9,87kWp
Energy production: 10068kWh or 1020.06kWh/kWp
Project 2 with Chinese Top Brand panel:
Solar Panel: Chinese Top Brand 250W
Mounting structure: Fixed at 30
Total capacity: 10kWp
Energy production: 9680kWh or 968 kWh/kWp
These data was from one of our clients in Greece, so, as you can see, SolarWorld performance in much better than Chinese one, although SolarWorld PV plant has a partial shadow in winter, the performance is 5% better. Both PV plants are located at same place. We are not showing the Chinese brand, but it is one of TOP 4 (Suntech, Yingli, Renesola or Trina).
What is the PV + Test?
It can be summarized in the following points:
- It is an independent test made with crystalline solar panels in collaboration with TÜV Rheinland SOLARPRAXIS and purchased directly from the market. That is, it is TÜV Rheinland who anonymously purchase the samples in the real market (no doubt this is the most important).
- A committee of experts decide which aspects to be analyzed are the most important to consider in the PV + Test and relevance is given to each of them. Are the rules of the game that set the general protocol test.
- Any manufacturer may request to be evaluated in the PV + Test.
- After the test, each manufacturer is informed of the results, with the quality level obtained, and the manufacturer decides whether or not to make public the results.
- The results are published from time to time in the PT-Magazine, the website of TÜV Rheinland, etc..
To summarize, in the words of one responsible for TÜV Rheinland, the objective of this test is "Unwrap the dust from the chaff" and therefore, TÜV Rheinland purchase samples in the real market for later analysis. You could say that what is intended is that the test results of the panels are coming to the end customer, not the manufacturer sends to analyze.
How many brands have been analyzed and what are the results?
So far 21 wellknown brands have been analyzed, but only 11 of these, the best scored, have authorized the release of the data, the rest of them chose not to display the results.