As I mentioned in other posts I am an electrician who has always worked in the civil photovoltaic field, but living in a sea area recently I have approached the electric
field in boating
and above all the installations of PV and wind
power plants in sailboats.
That said, I miss a lot of nautical experience, less in the photovoltaic field. Initially following some forums
for the first installations for my clients I used Solbian panels
and Lensun panels
, later I moved on to Fly Solartech.
In any case, since the first orders with Lensun I have noticed high quality deficiencies that I did not notice with solbian. In fact, two years after the installation
of these products, I find that many do not work
anymore and Lensun turned deaf ears no longer responding to emails:
So without any controversy I tested those Lensun products with problems and this is the result:
1. Modules with whole cells and with cut cells;
Defects on whole-cell modules are attributable to welding in the JB, while for the modules with cut cells, there appears to be problems with internal welding.
The welding between the panel coming from the panel and JB's contact is not performed correctly. As we can see in the picture below "wrong welding", welding is performed in the opposite way to good practice ("welding" image), leading to problems of "it works / does not work" diagnosed by my clients. A problem of contact stability and mechanical stress.
The gel inside the JB does not protect against mechanical stress, bringing electrical
contact (under certain conditions) to "work" in compression
and traction, loosening or even breaking it.
In the modules with cut cells, I tested with the tester and there is no production of V and I. There must be an internal interruption due to a welding between the totally incorrect cells.
1. IP Grade
The IP grade declared by the various JBs is not respected: can be inserted a screwdriver between the cable and the JB (photo "JB no IP65") and the cable (photo "wrong connector") lacks the cable gland (pictured in "other producer connector. "). In my opinion, a module with a lower IP degree is subject to the aggressiveness of weather
elements, including humidity (it is not necessary for the module to get wet for problems) and the salt
atmosphere (Typical of coastal areas) and of the normal applications of these panels for nautical use.
I found a 2.5mm2 section cable to enter a 4mm2 JB; MC4-compatible connectors with loose or open clamps (in addition to the aforementioned lack of cable gland), JB caps are almost always without internal gasket (hence no IP65 or IP67 - photo JB no gasket). An early deterioration of the module, as well as potential safety issues.
I have performed demo videos that I will upload as soon as possible. They define the products as high quality and not cheap, they are definitely not “high quality” and certainly not so cheap.
Lensun staff are very good at selling, but when there is a problem they disappear, and they do not have to comply with any guarantees as it is a Chinese company with no European branch . For that reason It 'impossible to retaliate against them. No economic sense. Excluding cheap Chinese products, Solbian and Fly Solartech are more powerful and safe products.